JP2010088142A - Insulator and armature core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of preventing pin hole caused by burr of teeth such as a mold in insulating between an armature winding and teeth and enabling easier acquisition of an insulation creepage distance in a superimposing part than an insulation film. <P>SOLUTION: The insulator made of molded resin surrounds the teeth 2 in a direction perpendicular to an axial direction Z. The insulator includes side surface portions 311, 321. The side surface portion 311 has a first end portion 314e and a second end portion 314f. The side surface portion 321 has a first end portion 324f and a second end portion 324e. The first end portion 314e and the second end portion 324e are superimposed so as to extend in the axial direction Z, and the first end portion 324f and the second end portion 314f are superimposed so as to extend in the axial direction Z. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an armature core of a so-called axial gap motor and an insulator provided in a tooth constituting the armature core.

  An armature employed in a so-called axial gap type motor generates a rotating magnetic field in the direction of the rotation axis of the motor. In the armature, a plurality of teeth are arranged in an annular shape around the rotation axis direction. An armature winding is wound around each of the teeth, and a rotating magnetic field is generated by energizing the armature winding.

  Thus, since the armature winding is energized, electrical insulation is required between the armature winding and the teeth around which it is wound. In order to meet such a requirement, for example, it is conceivable to mold an insulator by molding a tooth. Alternatively, it is conceivable that the air-core armature winding is insulated with a tape or the like and then the armature winding is attached to the teeth. Alternatively, it is also possible to superimpose insulating films.

  Patent Documents 1 to 6 disclosing techniques related to the present application are listed below. Patent Documents 1 to 3 exemplify insulators, and Patent Documents 4 to 6 exemplify configurations for hooking armature windings and terminals.

JP 2005-51929 A JP 2003-188030 A JP 2005-348547 A JP 2002-115655 A JP 2002-136003 A Japanese Patent Laid-Open No. 9-023629

  However, when an insulator is formed by a mold, a pinhole is likely to be generated due to a burr of a tooth or the like, and the insulator tends to be thick in order to avoid the generation of the pinhole. In particular, when the teeth are composed of laminated steel sheets, the insulator tends to be thick in order to ensure a certain thickness in consideration of the dimensional tolerance.

  When the air-core coil is prepared in advance and then provided on the teeth, it is difficult to attach the teeth to a tooth having a shape spreading at both ends (or one end) in the rotation axis direction. Such a shape of the teeth is employed to embed the teeth in the yoke or to increase the efficiency of inflow and outflow of field magnetic flux from the opposing field element.

  When an insulating film is used, an overlapping portion is required, but it is difficult to ensure a creepage distance at the overlapping portion. Moreover, it is difficult to combine a plurality of the teeth on the teeth.

  Therefore, in the present invention, when taking insulation between the armature winding and the tooth, a pinhole due to the burr of the tooth as in the mold does not occur, and the insulation creepage at the overlapping portion as compared with the insulating film. An object is to provide a technology that can easily obtain a distance.

  An insulator (3) according to the present invention includes at least one of a plurality of teeth (2) arranged in an annular shape around the predetermined direction in an armature that generates a rotating magnetic field in a predetermined direction (Z). An insulator for an armature that is enclosed in a direction perpendicular to the predetermined direction. The first aspect includes a first end portion (314e, 324f; 354k, 364l) extending in the predetermined direction, and a second end portion extending in the predetermined direction and overlapping the first end portion. (324e, 314f; 364k, 354l), and other positions at positions where the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) overlap. It has thicker side portions (311, 321; 351, 361) and is made of molded resin.

  The 2nd aspect of the insulator concerning this invention is the 1st aspect, Comprising: Each of said teeth (2) is enclosed individually.

  According to a first aspect of the armature core according to the present invention, the second aspect of the insulator according to the present invention and the predetermined direction (Z) are arranged in an annular shape with each of the predetermined directions (Z) as an axis. A plurality of the teeth (2) surrounded by a direction perpendicular to the direction, and an insulating film (8). And each of the said teeth has the collar part (22) extended in the said predetermined direction (Z) side edge part, and the said insulating film is the said collar part and the said side part (311,321; 351,361), and It is inserted between.

  A second aspect of the armature core according to the present invention is the first aspect, wherein the insulating film (8) includes the first end (314e, 324f; 354k, 364l) and the second end. The portions (324e, 314f; 364k, 354l) are cut away so as to avoid overlapping positions.

  The 3rd aspect of the armature core concerning this invention is the 2nd aspect, Comprising: As for the said insulating film (8), the several sheet from which the cut | disconnected location (80) differs is arrange | positioned.

  4th aspect of the armature core concerning this invention is the 1st aspect, Comprising: The said insulating film (8) is the said between the said side part (311,321; 351,361) and the said teeth. The first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) have a tongue (81) that covers at least a part of the overlapping position.

  A fifth aspect of the armature core according to the present invention is the fourth aspect thereof, wherein the side surface portions (311, 321; 351, 361) are recessed portions (30) for accommodating the tongue portions (81). Have

  A third aspect of the insulator according to the present invention is the second aspect, wherein the side surface portions (311, 321; 351, 361) are flat surfaces (3e, 3f; 3k, 3l) on the teeth side. And the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) overlap each other at the position of the flat surface. The flat surface is configured.

  According to a sixth aspect of the armature core according to the present invention, the armature core according to the present invention is arranged annularly with the third direction of the insulator according to the present invention as the axis, and the predetermined direction (Z) is an axis. And a plurality of the teeth (2) surrounded by a direction perpendicular to the direction. Each of the teeth is composed of a plurality of steel plates stacked in a direction (R, θ) orthogonal to the predetermined direction.

  7th aspect of the armature core concerning this invention is the 6th aspect, Comprising: At least 1 said teeth (2) exhibits the end surface (21c) parallel to the lamination direction of the said steel plate. The flat surface (3k; 3l) of the insulator (3) surrounding the teeth is in contact with the end surface, and the first end (354k, 364l) and the second end (364k, 354l) are It overlaps on the end face side.

  The 8th aspect of the armature core concerning this invention is the 7th aspect, Comprising: The yoke (1) which arrange | positions the said teeth (2) cyclically | annularly is further provided. And the said tooth | gear has a to-be-embedded part (23) which protrudes on the opposite side to the said predetermined direction (Z) with respect to the said side part (311,321; 351,361) and is embed | buried under the said yoke. The stacking direction of the steel plates in the teeth is a radial direction (R) with the predetermined direction (Z) as an axis at the position of the teeth, and the end surface (21c) is viewed from the predetermined direction. It overlaps with the external shape of the embedded part (23).

  A ninth aspect of the armature core according to the present invention is the sixth aspect, wherein the teeth are surrounded by side surfaces (21a, 21b) in a direction in which the plurality of steel plates are laminated. The flat surface (3e; 3f) of the insulator (3) is disposed, and the first end (314e; 324f) and the second end (324e; 314f) overlap on the side surface side.

  A fourth aspect of the insulator according to the present invention is any one of the first to third aspects, wherein the side surface portion (311, 321; 351, 361) viewed from the predetermined direction (Z) is provided. As for the external shape, the bent part is rounded.

  A fifth aspect of the insulator according to the present invention is any one of the first to fourth aspects, and is continuous with the first end portion (314e, 324f; 354k, 364l) and in the predetermined direction ( Z) is connected to the third end (314a, 324b; 354g, 364h) perpendicular to Z) and the second end (324e, 314f; 364k, 354l), and extends perpendicularly to the predetermined direction. And a top surface portion (312, 322; 352, 362) having a fourth end portion (324a, 314b; 364g, 354h) overlapping with the third end portion, and the first end portion and the second end portion. The third end portion and the fourth end portion overlap at a position on the predetermined direction side of the position where the portion overlaps.

  According to a tenth aspect of the armature core of the present invention, the fifth aspect of the insulator according to the present invention is annularly arranged with the predetermined direction (Z) as an axis. And a plurality of the teeth (2) surrounded by a direction perpendicular to the direction. And each of the said teeth has the collar part (22) extended in the said predetermined direction (Z) side edge part, and the said collar part is the said top surface part (312,322) in the said predetermined direction (Z). 352, 362).

  An eleventh aspect of the armature core according to the present invention is the tenth aspect, and in the predetermined direction (Z), the thickness of the flange portion (22) is equal to or greater than the thickness of the top surface portion. is there.

  A sixth aspect of the insulator according to the present invention is any one of the first to fifth aspects, and is continuous with the first end (314e, 324f; 354k, 364l) in the predetermined direction ( Z) extends perpendicular to the predetermined direction continuously with the fifth end (314c, 324d; 354i, 364j) and the second end (324e, 314f; 364k, 354l). And a bottom surface portion (313, 323; 353, 363) having a sixth end portion (324c, 314d; 364i, 354j) overlapping the fifth end portion. The fifth end portion and the sixth end portion overlap at a position opposite to the predetermined direction of the position where the first end portion and the second end portion overlap.

  A twelfth aspect of the armature core according to the present invention includes a sixth aspect of the insulator according to the present invention and the teeth (2) each of which is surrounded by the insulator in a direction perpendicular to the predetermined direction. And a yoke (1) that annularly arranges the plurality of teeth (2) around the predetermined direction (Z). The teeth have an embedded portion (23) that protrudes in the opposite direction to the predetermined direction with respect to the bottom surface portion (313, 323; 353, 363), and the yoke is open to the predetermined direction side. The first groove (11) for burying the buried portion and the second groove (12) for opening in the predetermined direction and burying the fifth end portion and the sixth end portion. .

  A thirteenth aspect of the armature core according to the present invention is the twelfth aspect, wherein the second groove (12) penetrates the yoke (1) in the predetermined direction (Z).

  A fourteenth aspect of the armature core according to the present invention is the twelfth aspect or the thirteenth aspect, in which the first groove (11) is arranged so that the yoke (1) extends in the predetermined direction (Z). To penetrate.

  A fifteenth aspect of the armature core according to the present invention is any one of the twelfth to fourteenth aspects, and includes the fifth end portion (314c, 324d) and the sixth end portion (324c) of the insulator. , 314d) is arranged alongside the teeth in the radial direction (R) at the position of the teeth where the insulator is provided with the predetermined direction (Z) as an axis. The second groove (12) of the yoke (1) is aligned in the radial direction with respect to the first groove.

  The seventh aspect of the insulator according to the present invention is the sixth aspect thereof, wherein the thickness of the bottom surface portion (313, 323; 353, 363) in the predetermined direction is the fifth end portion (314c). , 324d; 354i, 364j) and the position where the sixth end portion (324c, 314d; 364i, 354j) overlaps is equal to the other position.

  An eighth aspect of the insulator according to the present invention is the seventh aspect, wherein the thickness of the bottom surface portion (313, 323; 353, 363) in the predetermined direction is the side surface portion (311 321). 351, 361) twice the thickness in the direction perpendicular to the predetermined direction.

  A ninth aspect of the insulator according to the present invention is any one of the first to eighth aspects, and the side surface portions (311, 321; 351, 361) in a direction perpendicular to the predetermined direction (Z). The thickness of the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) are at least twice as large as the other positions ( d1 + d2> 2t; d3 + d4> 2t; d5 + d6> 2t; d7 + d8> 2t).

  A tenth aspect of the insulator according to the present invention is the third aspect, wherein the thickness of the side surface portions (311, 321) in the direction perpendicular to the predetermined direction (Z) is the first end. The portion (314e, 324f) and the second end portion (324e, 314f) are at least twice as large as the other position (d1 + d2> 2t; d3 + d4> 2t). Then, the flat surfaces (3e, 3f) are located at the other positions of the side surface portion from a position where the first end portion and the second end portion overlap in a direction perpendicular to the predetermined direction (Z). It exists in the extending direction away from the thickness (t) or more.

  An eleventh aspect of the insulator according to the present invention is the first aspect, and includes the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l). Are the same thickness or narrower towards each tip.

  A twelfth aspect of the insulator according to the present invention is the eleventh aspect, in which the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) Taper. The thickness of the side surface in the direction perpendicular to the predetermined direction (Z) is equal to the other position at the position where the first end and the second end overlap.

  A thirteenth aspect of the insulator according to the present invention is the first aspect, and a plurality of the side surface portions are provided. The first end (314e / 324f; 354k / 364l) of one of the side surfaces (311/321; 351/361) is the second end of the other side surface (321/311; 361/351). (324e / 314f; 364k / 354l).

  In the armature that generates a rotating magnetic field in a predetermined direction, each of the plurality of teeth arranged in an annular shape around the predetermined direction has an armature winding that surrounds the tooth in a direction perpendicular to the predetermined direction. Used in the form provided. Therefore, the insulator concerning this invention bears the insulation between the said teeth and the armature winding provided in the said teeth by surrounding the said teeth in the direction perpendicular | vertical to a predetermined direction. Moreover, since it is made of a molded resin, pinholes caused by burrs of teeth do not occur unlike a mold, and it is not difficult to obtain an insulation creepage distance at an overlapped portion like an insulating film.

  And according to the 1st aspect of the insulator concerning this invention, although a boundary arises between the 1st end part and the 2nd end part, since the 1st end part and the 2nd end part overlap, this overlapping position The insulation distance can be increased. In addition, since both the first end and the second end extend in a predetermined direction, the step of providing the insulator on the teeth is performed in a predetermined direction with the first end and the second end open. It is only necessary to move along the direction perpendicular to the teeth and attach to the teeth. Therefore, even if the shape of the teeth on which the insulator is to be provided has a flange that expands at the end in a predetermined direction, there is an advantage that the process is not hindered. In addition, by overlapping the first end and the second end at a position where the insulator is thick, the mechanical strength is increased and the insulation distance can be increased.

  According to the 2nd aspect of the insulator concerning this invention, when providing the armature winding wound by the concentrated winding provided in a tooth on a tooth, it becomes easy to form an armature winding by an aligned winding.

  According to the 1st aspect of the armature core concerning this invention, the insulation between a collar part and an armature winding can be taken.

  According to the 2nd aspect of the armature core concerning this invention, since the insulating film is cut | disconnected, the process arrange | positioned between a collar part and a side part is easy. In addition, the cut position is arranged avoiding the position where the first end portion and the second end portion overlap each other, so that the creeping distance at the position is not impaired.

  According to the 3rd aspect of the armature core concerning this invention, since the cutting location of a some insulating film does not communicate, a creeping distance is not impaired.

  According to the 4th aspect of the armature core concerning this invention, the creeping distance in the position where a 1st edge part and a 2nd edge part overlap can be taken long.

  According to the 5th aspect of the armature core concerning this invention, even if it provides an insulating film, an insulator and teeth can be stuck and arranged.

  According to the third aspect of the insulator of the present invention, the flat surface of the insulator can be provided in close contact with the flat surface of the teeth. The armature winding tends to be wound away from the teeth due to its own rigidity from a non-flat surface (for example, a corner) of the teeth to a flat surface. Therefore, even if the insulator is made thicker at the flat surface than at other positions, it is difficult to damage the shape in which the armature winding is wound.

  According to the 6th aspect of the armature core concerning this invention, an insulator absorbs the thickness tolerance of the laminated steel plate which comprises teeth.

  According to the 7th aspect of the armature core concerning this invention, an insulator absorbs the thickness tolerance of the laminated steel plate which comprises teeth.

  According to the 8th aspect of the armature core concerning this invention, manufacture of teeth is easy.

  According to the ninth aspect of the armature core according to the present invention, the laminated steel plates constituting the teeth are fastened by the insulator. Therefore, even when a motor employing an armature using the armature core and a field element facing the armature along the predetermined direction is driven by pulse width modulation, the generated noise is reduced. Can be small.

  According to the 4th aspect of the insulator concerning this invention, an armature winding is easy to wind.

  According to the fifth aspect of the insulator of the present invention, even if the teeth have a hook portion extending perpendicularly to the predetermined direction on the predetermined direction side with respect to the insulator, the hook portion And the armature winding can be insulated.

  And although a boundary arises between a 3rd edge part and a 4th edge part, since a 3rd edge part and a 4th edge part overlap, an insulation distance can be taken long in this overlapping position.

  According to the tenth aspect of the armature core according to the present invention, the insulator does not exceed the collar portion of the tooth in the predetermined direction. Therefore, in a motor that employs an armature that uses the armature core and a field element that faces the armature along the predetermined direction, it is easy to reduce the distance between the armature and the field element. .

  According to the eleventh aspect of the armature core according to the present invention, even if the third end portion and the fourth end portion overlap without changing the thickness thereof, the insulator is in a predetermined direction toward the hook portion of the tooth. Therefore, the advantage of the fourth aspect of the armature core can be enjoyed.

  According to the sixth aspect of the insulator of the present invention, even if a yoke extending perpendicularly to the predetermined direction is provided on the opposite side of the predetermined direction with respect to the teeth on which the insulator is provided, Insulation between the yoke and the armature winding can be taken.

  And although a boundary arises between a 5th edge part and a 6th edge part, since a 5th edge part and a 6th edge part overlap, an insulation distance can be taken long in this overlapping position.

  According to the twelfth aspect of the armature core according to the present invention, even if the bottom surface portion at the position where the fifth end portion and the sixth end portion overlap increases in thickness in a predetermined direction, the thickness is Since it is absorbed by the second groove, the embedded portion of the tooth can be embedded in the first groove of the yoke with high accuracy.

  According to the thirteenth aspect of the armature core according to the present invention, the yoke can be easily formed.

  According to the fourteenth aspect of the armature core according to the present invention, the yoke can be easily formed.

  According to the fifteenth aspect of the armature core according to the present invention, since the second groove is not provided in the circumferential direction, the magnetic path of the rotating magnetic field flowing in the circumferential direction in the yoke is not obstructed.

  According to the seventh aspect of the insulator of the present invention, the portion where the end of the fifth portion and the end of the sixth portion overlap is on the opposite side of the predetermined direction with respect to the teeth on which the insulator is provided. It does not become an obstacle when providing a yoke extending perpendicularly to a predetermined direction.

  According to the 8th aspect of the insulator concerning this invention, while enjoying the effect of the 8th aspect, the insulation distance in the position where a 5th edge part and a 6th edge part overlap with a 1st edge part It can be as long as the insulation distance at the position where the second end overlaps.

  According to the ninth aspect of the insulator of the present invention, the creeping distance at the position where the first end and the second end overlap can be increased.

  According to the tenth aspect of the insulator of the present invention, the outer shape of the side surface viewed from a predetermined direction is rounded while taking a long creepage distance at the position where the first end and the second end overlap. It is easy to wind the armature winding.

  According to the 11th aspect of the insulator concerning this invention, since what is called a taper is exhibited in resin molding, manufacture is easy. Moreover, the insulator does not deform and fits into the teeth.

  According to the twelfth aspect of the insulator according to the present invention, since the first end and the second end are tapered and overlapped, it is not always necessary to increase the thickness of the overlapping position.

  According to the thirteenth aspect of the insulator according to this invention, even if the elastic deformation of the side surface portion is small, the effect of the first aspect can be enjoyed.

First embodiment.
FIG. 1 is a perspective view showing a configuration of an armature insulator (hereinafter simply referred to as “insulator”) 3 according to a first embodiment of the present invention.

  The insulator 3 surrounds the teeth in a direction perpendicular to the predetermined direction Z. The insulator 3 includes side surface portions 311 and 321 which are overlapped by the overlapping portion 34f.

  The insulator 3 is made of molded resin, and examples thereof include LCP (liquid crystal polymer), PPS (polyphenylene sulfide resin), and PBT (polybutylene terephthalate).

  The teeth are arranged in an annular shape in an armature (not shown) with a predetermined direction Z as an axis (hereinafter referred to as “axial direction Z”), but only one of them is shown here. Here, the main body portion of the tooth is hidden by the insulator 3, and the tooth flange portion 22 and the embedded portion 23 appear.

  As a direction perpendicular to the predetermined direction Z, a radial direction R (outward with respect to the direction Z serving as an axis) and a circumferential direction θ (viewed from the same direction as the direction Z) at the position of the tooth as an axis. (Clockwise direction) is illustrated. The armature generates a rotating magnetic field in the axial direction Z.

  In the armature that employs the teeth 2, an armature winding (not shown) is wound around the axial direction Z as an axis. Such an armature is employed in a so-called axial gap type motor.

  Of course, it is desirable that the insulator 3 is provided in all of the teeth used in the armature, but the insulator 3 may be provided in at least one of the plurality of teeth 2.

  It is desirable that each of the teeth 2 is individually surrounded by the insulator 3. When the armature winding provided on the tooth 2 is wound by concentrated winding and provided on the tooth 2, it is easy to form the armature winding by aligned winding.

  2 and 3 are both perspective views showing a process in which the teeth 2 are surrounded by the insulator 3. 2 and 3 are different in perspective direction. The tooth 2 has a main body 21, a flange portion 22, and an embedded portion 23. The main body 21 extends in the axial direction Z. The flange 22 expands at the end on the axial direction Z side. The embedded portion 23 protrudes on the opposite side to the axial direction Z with respect to the main body 21 and is embedded in a yoke described later. FIG. 4 is a perspective view illustrating a configuration in which the configuration on the axial direction Z side is omitted including the flange portion 22.

  The side part 311 presents a first end 314e and a second end 314f. The side part 321 presents a first end 324f and a second end 324e. The first end portions 314e and 324f and the second end portions 314f and 324e all extend in the axial direction Z. However, it is not always necessary to be parallel to the axial direction Z, and it is only necessary to extend in the axial direction Z even if inclined with respect to the axial direction Z.

  The first end 314e and the second end 324e overlap, and the second end 314f and the first end 324f overlap. In order to realize these overlaps, the first end portions 314e and 324f and the second end portions 314f and 324e all have a step. In FIG. 1, an overlapping portion 34f where the first end portion 314e and the second end portion 324e overlap each other appears. In FIG. 4, in addition to the overlapping portion 34f, an overlapping portion 34e where the first end portion 324f and the second end portion 314f overlap each other also appears.

  2 and FIG. 3, the side surfaces 311 and 321 are combined with the main body 21 sandwiched along the direction indicated by the chain line (direction parallel to the circumferential direction θ), whereby the insulator 3 causes the teeth 2 to move in a predetermined direction. Enclose in a direction perpendicular to Z.

  In an armature that generates a rotating magnetic field in the axial direction Z, an armature winding that surrounds the tooth 2 in a direction perpendicular to the axial direction Z is provided in each of a plurality of teeth 2 that are annularly arranged with the axial direction as an axis. Is used. More specifically, an armature winding (not shown) is wound around the main body 21 via the side surface portions 311 and 321.

  That is, the insulator 3 encloses the tooth 2 in a direction perpendicular to the axial direction Z, thereby providing insulation between the tooth 2 and the armature winding provided in the tooth 2. Moreover, since it is made of a molded resin, pinholes caused by burrs of teeth do not occur unlike a mold, and it is not difficult to obtain an insulation creepage distance at an overlapped portion like an insulating film.

  And in the insulator 3, although a boundary arises between the 1st end part 314e and the 2nd end part 324e (or / and between 1st end part 324f and the 2nd end part 314f), since both overlap, this The insulation distance can be increased at the overlapping position.

  Moreover, since the first end portions 314e and 324f and the second end portions 324e and 314f also extend in the axial direction Z, the step of providing the insulator 3 in the tooth 2 is performed by the first end portion 314e and the second end portion 324e. (Or / and the first end portion 324f and the second end portion 314f) are open and move along a direction perpendicular to the axial direction Z (here, a direction parallel to the circumferential direction θ) to the teeth. It is only necessary to attach 2. Therefore, even if the shape of the tooth 2 on which the insulator 3 is to be provided has the flange portion 22, there is an advantage that the process is not hindered.

  FIG. 5 is a plan view showing a configuration in which the configuration on the axial direction Z side is omitted including the flange portion 22. The direction in plan view is opposite to the axial direction Z.

  The side surface portions 311 and 321 are thicker than the other positions in the overlapping portions 34e and 34f. Specifically, the thicknesses d1, d2, d3, d4 of the first end 314e, the second end 324e, the first end 324f, and the second end 314f, and positions other than the overlapping portions 34e, 34f. D1 + d2> t and d3 + d4> t are established when the thickness t of the side surface portions 311 and 321 is used.

  Taking the overlapping portion 34e as an example, a length W (hereinafter referred to as “overlapping length”) W where the first end portion 314e and the second end portion 324e overlap is introduced, and the outer peripheral surface 21d of the main body 21 and the insulator are introduced. 3 is expressed as d1 + d2 + W. Since the armature winding is wound around the outer peripheral surface 3d, the minimum value of the insulation distance between the armature winding and the main body 21 is this extended surface distance. Therefore, increasing d1 + d2 is adopted as one method for increasing the surface area.

  In this way, at the position where the insulator 3 is thick, the first end 314e and the second end 324e (or / or the first end 324f and the second end 314f) are connected to each other. By overlapping, the mechanical strength in the overlapping portions 34e and 34f increases, and a long insulation distance can be taken.

  Since the thicknesses d1 to d4 are usually selected to be about the thickness t, it is not difficult to satisfy d1 + d2> 2t and d3 + d4> 2t, and the creepage distances at the overlapping positions 34e and 34f are Desirable in terms of lengthening.

  More desirably, the side surface portions 311 and 321 present flat surfaces 3e and 3f on the teeth 2 side (more specifically, the main body 21 side), respectively. At the positions of the flat surfaces 3e and 3f, the side surface portions 311 and 321 are thicker than other positions. More specifically, for example, the side surface portion 311 has a flat surface 311f on the side opposite to the front end of the second end portion 314f and on the main body 21 side, and the side surface portion 321 has a side opposite to the front end of the first end portion 324f on the main body 21. A flat surface 321f is provided on each side. The first end portion 324f and the second end portion 314f overlap each other, so that the flat surfaces 311f and 321f constitute the flat surface 3f. Similarly, the flat surface 3e is configured by the first end 314e and the second end 324e overlapping each other.

  Thus, the flat surfaces 3e and 3f provided on the insulator 3 can be provided in close contact with the flat surfaces 21a and 21b of the main body 21, respectively. The armature winding tends to be wound away from the main body 21 due to its own rigidity from the non-flat surface (for example, the corner 21j) of the main body 21 to the flat surfaces 21a and 21b. Therefore, even if the insulator 3 is thicker than the other positions at the positions of the flat surfaces 3e and 3f, it is difficult to damage the shape in which the armature winding is wound.

  In the direction perpendicular to the axial direction Z, the flat surface 3e is spaced apart from the position where the first end portion 314e and the second end portion 324e overlap with each other by a thickness t or more at other positions of the side surface portions 311 and 321. It is desirable to exist in the extending direction of the surface 3e. That is, it is desirable that the flat surface 3e as viewed from the axial direction Z is flat in a portion having the overlapping length W and a length t on both sides thereof. The same applies to the superposition 34f. By taking a long flat portion in this manner, the outer shape of the side surface portions 311 and 321 as viewed from the axial direction Z is rounded and the armature winding is easily wound while taking a long creepage distance.

  Each of the teeth 2 is configured by laminating a plurality of steel plates, for example. Then, by using the insulator 3 to surround the tooth 2 in a direction perpendicular to the predetermined direction Z, the insulator 3 absorbs the thickness tolerance of the laminated steel sheet.

  The flat surfaces 21a and 21b are side surfaces in the radial direction R. Therefore, when the direction where the some steel plate which comprises the teeth 2 is laminated | stacked is the radial direction R, the flat surfaces 21a and 21b each appear as a rolling surface of a steel plate. By arranging the flat surfaces 3e and 3f of the insulator 3 on the flat surfaces 21a and 21b of the tooth 2, the overlapping portions 34e and 34f are arranged on the flat surfaces 21a and 21b side. Therefore, by winding the armature winding around the tooth 2 via the insulator 3, the laminated steel plates are fastened along the radial direction R by the insulator 3. Thereby, in the teeth 2 surrounded by the insulator 3, the movement of the laminated steel plates in the stacking direction is prevented.

  Such tightening of laminated steel plates brings about an effect of reducing noise generated from the motor. That is, even when a motor employing an armature using the tooth 2 as a part of the armature core is driven by pulse width modulation, noise caused by the carrier used for the pulse width modulation can be reduced. Of course, the motor employs a field element (not shown) facing the armature along the axial direction Z together with the armature.

  Even if the tolerance of the width (here, the length along the radial direction θ) of the rolled surface of the laminated steel sheet is the maximum, the first end 314e is overlapped with the first end 314e and the second end 324e. The length of the second end 324e is preferably selected.

  As for the external shape of the side part 311 and 321 seen from the axial direction Z, it is desirable that the bent part is rounded. This is because the inflection point from the non-flat surface (for example, the corner portion 21j) of the main body 21 to the flat surfaces 21a and 21b is eliminated by the insulator 3, and the armature winding is easily wound.

  1 to 3 again, the insulator 3 further includes top surface portions 312 and 322. The top surface portion 312 exhibits a third end portion 314a and a fourth end portion 314b, and the top surface portion 322 exhibits a third end portion 324b and a fourth end portion 324a. The third end portions 314a and 324b are continuous with the first end portions 314e and 324f, respectively, and extend perpendicular to the axial direction Z. The fourth end portions 324a and 314b are continuous with the second end portions 324e and 314f, respectively, and extend perpendicular to the axial direction Z.

  The third end 314a and the fourth end 324a overlap at the overlapping portion 34a, and the third end 324b and the fourth end 314b overlap at the overlapping portion 34b. The overlapping portion 34a is positioned on the axial direction Z side of the overlapping portion 34e, and the overlapping portion 34b is positioned on the overlapping portion 34f. In other words, the third end portion 314a and the fourth end portion 324a overlap at the position on the axial direction Z side where the first end portion 314e and the second end portion 324e overlap, and the third end portion 324b and the fourth end portion 324a. The end portion 314b overlaps at a position on the axial direction Z side where the first end portion 324f and the second end portion 314f overlap.

  1 to 3 exemplify the case where the overlapping portions 34a and 34b extend in parallel to the radial direction R, they may extend in a direction having a component in the circumferential direction θ.

  By providing such top surface portions 312 and 322, even if the flange portion 22 is provided on the tooth 2 on the axial direction Z side with respect to the insulator 3, the insulation between the flange portion 22 and the armature winding is provided. Can be taken. In the insulator 3, a boundary is generated between the third end 314 a and the fourth end 324 a (or / and further between the third end 324 b and the second end 314 b). The insulation distance can be increased at the position.

  In the axial direction Z, it is desirable that the flange portion 22 protrudes from the top surface portions 312 and 322. At this time, the insulator 3 does not exceed the flange portion 22 in the axial direction Z. Therefore, in a motor employing an armature using the teeth 2 as an armature core and a field element facing the armature along the axial direction Z, the distance between the armature and the field element is reduced. easy. This is an advantage that the so-called air gap is not unnecessarily increased while the insulator 3 is employed.

  For example, in the axial direction Z, when the thickness of the flange portion 22 is equal to or greater than the thickness of the top surface portions 312, 322, the third end portion 314a and the fourth end portion 324a (or / or the third end portion 324b and the second end portion) Even if the end portion 314b) overlaps without changing its thickness, the insulator 3 does not exceed the flange portion 22 in the axial direction Z.

  Of course, it is not essential to provide the collar portion 22 in the tooth 2, and the main body 21 may be exposed as shown in FIG. However, the provision of the flange 22 is desirable in that it is easy to incorporate a large amount of field magnetic flux from a field element (not shown) facing the armature using the tooth 2.

  When the teeth 2 are configured by laminating a plurality of steel plates, it will be described later in “deformation”, but it is desirable that the flange 22 projects in a direction perpendicular to the laminating direction. That is, when the steel plates are laminated in the radial direction R, the flange portion 22 extends along the circumferential direction θ, and when the steel plates are stacked in the circumferential direction θ, the flange portion 22 extends along the radial direction R from the main body 21. Overhang.

  When the overlapping portions 34a and 34b are thicker than other portions of the top surface portions 312, 322, it is desirable that the flange portions 22 are provided side by side with the flange portions 22 in a direction in which the flange portions 22 do not protrude, that is, in the stacking direction. More broadly speaking, it is desirable that the overlapping portions 34 a and 34 b are provided at a position where the collar portion 22 does not protrude from the main body 21. In the configuration shown in FIGS. 2 and 3, the flange 22 protrudes from the main body 21 along the circumferential direction θ, but the flange 22 does not protrude from the main body 21 along the radial direction R.

  The overlapping portions 34 a and 34 b are arranged side by side with the flange portion 22 in the radial direction R. The overlapping portions 34 a and 34 b arranged at such positions can be arranged without protruding to the main body 21 side from other portions of the top surface portions 312 and 322.

  On the other hand, when the overlapping portions 34a and 34b are arranged side by side in the direction in which the collar portion 22 projects in the circumferential direction θ, the overlapping portions 34a and 34b have the thicknesses of the top surface portions 312 and 322. Since it is thicker than the other parts, it protrudes from the other parts of the top surface portions 312 and 322 to the main body 21 side. Such protrusion of the overlapping portions 34 a and 34 b toward the main body 21 reduces the space in the main body 21 where the armature winding is to be wound.

  Therefore, if there is a position where the collar portion 22 does not protrude from the main body 21, the overlapping portions 34 a and 34 b are thicker than other portions of the top surface portions 312 and 322 by providing the overlapping portions 34 a and 34 b at the position. This also brings about an effect of avoiding a situation in which the space in which the armature winding is to be wound in the main body 21 is reduced.

  Of course, even if the teeth 2 are not configured by laminating a plurality of steel plates, if the flange portion 22 is provided, a suitable position for providing the overlapping portions 34a and 34b can be selected. If there is a position where the collar portion 22 does not protrude from the main body 21, the above effect can be obtained by providing the overlapping portions 34 a and 34 b at the position.

  The insulator 3 further includes bottom surface portions 313 and 323. The bottom surface portion 313 exhibits a fifth end portion 314c and a sixth end portion 314d, and the bottom surface portion 323 exhibits a fifth end portion 324d and a sixth end portion 324c. The fifth end portions 314c and 324d are continuous with the first end portions 314e and 324f, respectively, and extend perpendicular to the axial direction Z. The sixth end portions 324c and 314d are continuous with the second end portions 324e and 314f, respectively, and extend perpendicular to the axial direction Z.

  The fifth end portion 314c and the sixth end portion 324c overlap at the overlapping portion 34c, and the fifth end portion 324d and the sixth end portion 314d overlap at the overlapping portion 34d. The overlapping portion 34c is positioned on the opposite side of the axial direction Z, and the overlapping portion 34d is positioned on the opposite side of the axial direction Z.

  In other words, the fifth end 314c and the sixth end 324c overlap at a position opposite to the axial direction Z of the position where the first end 314e and the second end 324e overlap, and the fifth end 324d The sixth end portion 314d overlaps at a position opposite to the axial direction Z where the first end portion 324f and the second end portion 314f overlap.

  1 to 3 exemplify the case where the overlapping portions 34c and 34d extend parallel to the radial direction R, they may extend in a direction having a component in the circumferential direction θ.

  By providing such bottom surface portions 313 and 323, even if a yoke is provided on the side opposite to the axial direction Z with respect to the tooth 2 on which the insulator 3 is provided, the space between the yoke and the armature winding is provided. Is insulated.

  In the insulator 3, a boundary is generated between the fifth end 314 c and the sixth end 324 c (or / and further between the fifth end 324 d and the sixth end 314 d). The insulation distance can be increased at the position.

  The tooth 2 has an embedded portion 23. The embedded portion 23 protrudes on the opposite side to the axial direction Z with respect to the bottom surface portions 313 and 323. The embedded portion 23 is used for connection with the above-described yoke.

  FIG. 7 is a perspective view showing a process of connecting the yoke 1 and the tooth 2 provided with the insulator 3. The yoke 1 extends perpendicular to the axial direction Z. In order to form the armature core, a plurality of teeth 2 are arranged in a ring shape, but only one tooth 2 is shown here to avoid the complexity of illustration.

  The teeth 2 are attached to the yoke 1 from the side opposite to the axial direction Z to the yoke 1. Specifically, each of the yokes 1 has a first groove 11 and a second groove 12 that open to the axial direction Z side. The first groove 11 embeds the buried portion 23. The second groove 12 embeds the overlapping portions 34c and 34d, specifically, the fifth end portion 314c and the sixth end portion 324c, the fifth end portion 324d and the sixth end portion 314d.

  In the overlapping portions 34c and 34d, the fifth end portion 314c and the sixth end portion 324c are overlapped with the fifth end portion 324d and the sixth end portion 314d, respectively, so that the bottom surface portions 313 and 323 are in the axial direction Z at this position. Thickness may increase. FIG. 6 is a side view showing the configuration of the overlapping portion 34 c, and shows a side surface seen along the radial direction R.

  The fifth end portion 314c maintains another thickness d13 of the bottom surface portion 313, and the sixth end portion 324c maintains another thickness d14 of the bottom surface portion 323. Therefore, at the position where the fifth end portion 314c and the sixth end portion 324c overlap (the overlapping portion 34c), the thickness along the axial direction Z of the insulator 3 is thicker than the thickness at other positions.

  Since this thickness is absorbed by the second groove 12 of the yoke 1, the embedded portion 23 of the tooth 2 can be embedded in the first groove 11 of the yoke 1 with high accuracy.

  The first groove 11 and the second groove 12 shown in FIG. 7 penetrate the yoke 1 in the axial direction Z. This is suitable when the yoke 1 is configured by laminating a plurality of steel plates along the axial direction Z. This is because the stacked steel sheets can be the same type.

  FIG. 8 is a perspective view showing a process of connecting another yoke 1 and the tooth 2 provided with the insulator 3. Although the first groove 11 shown in FIG. 8 penetrates the yoke 1 in the axial direction Z, the second groove 12 does not penetrate the yoke 1. Even such a yoke 1 is suitable when the yoke 1 is configured by laminating a plurality of steel plates along the axial direction Z. This is because if two types of steel plates are prepared, the yoke 1 can be configured by laminating them.

  7 and 8, the fifth end portions 314 c and 324 d and the sixth end portions 324 c and 314 d of the insulator 3 surrounding the tooth 2 have diameters. They are arranged side by side with the teeth 2 in the direction R. Consistent with this, the second groove 12 of the yoke 1 is aligned in the radial direction R with respect to the first groove 11.

  When a rotating magnetic field is generated using the teeth 2, the magnetic path of the rotating magnetic field flowing in the yoke 1 is along the circumferential direction θ. As described above, since the second groove 12 is not provided in the circumferential direction θ with respect to the tooth 2, the magnetic path through which the rotating magnetic field flows in the yoke 1 is not obstructed.

  Note that the second groove 12 corresponding to the overlapping portion 34c is not provided in either the case shown in FIG. 7 or the case shown in FIG. This is because the first groove 11 opens larger than the overlapping portion 34c. Of course, the second groove 12 corresponding to the overlapping portion 34 c may be provided on the inner peripheral side of the first groove 11. However, as shown in FIGS. 7 and 8, the opening of the first groove 11 larger than the overlapping portion 34 c reduces the eddy current generated in the yoke 1 due to the magnetic flux change in the teeth 2. Desirable from the viewpoint.

  9 has a configuration in which a magnetic bottom 13 is added to the configuration of the yoke 1 shown in FIG. A hole 130 through which a rotating shaft (not shown) of the motor is inserted is formed in the bottom 13 of the magnetic body. The yoke 1 having such a structure can be manufactured by compacting, but is also suitable when the yoke 1 is configured by laminating a plurality of steel plates along the axial direction Z. This is because if two types of steel plates are prepared, the yoke 1 can be configured by laminating them.

Second embodiment.
FIG. 10 is a perspective view showing a configuration of an insulator 3 according to the second embodiment of the present invention. As in the case shown in the first embodiment, the insulator 3 is made of molded resin and surrounds the teeth in a direction perpendicular to the predetermined direction Z. The teeth shown in the first embodiment are adopted as the configuration of the teeth.

  The insulator 3 includes side surface portions 351 and 361, which are overlapped by an overlapping portion 34l.

  As in the case shown in the first embodiment, it is desirable that the insulator 3 is provided in all the teeth used in the armature, but the insulator 3 is provided in at least one of the plurality of teeth 2. May be.

  FIG. 11 is a perspective view showing a process in which the teeth 2 are surrounded by the insulator 3. FIG. 12 is a plan view showing a configuration in which the configuration on the axial direction Z side is omitted including the flange portion 22. The direction in plan view is opposite to the axial direction Z.

  The side surface portion 351 has a first end portion 354k and a second end portion 354l. The side surface portion 361 has a first end portion 364l and a second end portion 364k. The first end portions 354k and 364l and the second end portions 354l and 364k all extend in the axial direction Z. However, it is not always necessary to be parallel to the axial direction Z, and it is only necessary to extend in the axial direction Z even if inclined with respect to the axial direction Z.

  The first end 354k and the second end 364k overlap, and the second end 364l and the first end 354l overlap. In order to realize these overlaps, the first end portions 354k and 364l and the second end portions 354l and 364k all have a step. In FIG. 10, an overlapping portion 341 in which the first end portion 364 l and the second end portion 354 l overlap each other appears. In FIG. 12, in addition to the overlapping portion 34l, an overlapping portion 34k in which the first end portion 354k and the second end portion 364k overlap with each other also appears.

  In FIG. 11, the side surfaces 351 and 361 are combined with the main body 21 sandwiched along the direction indicated by the chain line (direction parallel to the circumferential direction θ), whereby the insulator 3 causes the teeth 2 to be perpendicular to the predetermined direction Z. Enclose in various directions. An armature winding (not shown) is wound around the main body 21 via the side surface portions 351 and 361.

  Accordingly, the insulator 3 is interposed between the tooth 2 and the armature winding provided in the tooth 2 in the same manner as in the first embodiment, and bears insulation therebetween. And since it is a product made of molded resin, pinholes caused by burrs of teeth do not occur unlike a mold, and it is not difficult to obtain an insulation creepage distance at an overlapping portion like an insulating film.

  In the insulator 3, although a boundary is generated between the first end 354k and the second end 364k (or / and further between the first end 364l and the second end 354l), both overlap each other. The insulation distance can be increased at the overlapping position.

  In addition, since the first end portions 354k and 364l and the second end portions 354l and 364k also extend in the axial direction Z, the step of providing the insulator 3 in the tooth 2 includes the first end portion 354k and the second end portion 364k. (Or / and further, the first end 364l and the second end 354l) are moved along a direction perpendicular to the axial direction Z (here, a direction parallel to the circumferential direction θ) to the teeth. It is only necessary to attach 2. Therefore, even if the shape of the tooth 2 on which the insulator 3 is to be provided has the flange portion 22, there is an advantage that the process is not hindered.

  The side portions 351 and 361 are thicker at the overlapping portions 34k and 341 than at other positions. Specifically, at the positions other than the thicknesses d5, d6, d7, and d8 of the first end 354k, the second end 364k, the second end 354l, and the first end 364l, and the overlapping portions 34k and 34l. D5 + d6> t and d7 + d8> t are established when the thickness t of the side surface portions 311 and 321 is used.

  As described above, the first end portion 354k and the second end portion 364k are overlapped (or / and the first end portion 364l and the second end portion 354l) are overlapped at the position where the insulator 3 is thick, thereby increasing the insulation distance. Can be taken.

  Since the thicknesses d5 to d8 are usually selected to be about the thickness t, it is not difficult to satisfy d5 + d6> 2t and d7 + d8> 2t, and the creepage distances at the overlapping positions 34k and 34l are Desirable in terms of lengthening.

  More desirably, the side surface portions 351 and 361 present flat surfaces 3k and 3l on the teeth 2 side (more specifically, on the main body 21 side), respectively. At the positions of the flat surfaces 3k and 3l, the side surface portions 351 and 361 are thicker than other positions. More specifically, for example, the side surface 351 has a flat surface 351k on the side opposite to the tip of the second end 354k and on the main body 21 side, and a flat surface on the side opposite to the tip of the second end 354l and on the main body 21 side. 351 l is presented. The side surface 361 has a flat surface 361l on the side opposite to the tip of the first end 364l and on the main body 21 side, and a flat surface 361l on the side opposite to the tip of the second end 364k and on the main body 21 side. Yes. The first end 354k and the second end 364k overlap each other, so that the flat surface 3k is configured by the flat surfaces 351k and 361k. Similarly, when the first end portion 364l and the second end portion 364l overlap each other, the flat surfaces 351l and 361l form a flat surface 3l.

  Thus, the flat surfaces 3k and 3l provided on the insulator 3 can be provided in close contact with the flat surface 21c of the main body 21, respectively. Therefore, similarly to the first embodiment, even if the insulator 3 is made thicker at the positions of the flat surfaces 3k and 3l than at other positions, the shape in which the armature winding is wound is hardly damaged.

  As in the first embodiment, it is desirable that the flat surfaces 3k and 3l are flat when viewed from the axial direction Z in a portion having the overlapping length W and a length t on both sides thereof. .

  When the teeth 2 are configured by laminating a plurality of steel plates, the insulator 3 absorbs the thickness tolerance of the laminated steel plates in the same manner as in the first embodiment.

  As in the first embodiment, it is desirable that each of the teeth 2 is individually surrounded by the insulator 3. However, in the configuration shown in this embodiment, unlike the configuration shown in the first embodiment, a plurality of side surface portions 351 are connected to each other, and a plurality of side surface portions 361 are connected to each other. A configuration can also be adopted. With this configuration, the number of steps surrounded by the insulator 3 with respect to the plurality of teeth 2 is reduced.

  The flat surface 21c is an end surface in the circumferential direction θ. Therefore, when the direction in which the plurality of steel plates constituting the tooth 2 are stacked is the circumferential direction θ, the flat surface 21c appears as a rolled surface of the steel plate. By arranging the flat surfaces 3k and 3l of the insulator 3 on the flat surface 21c of the tooth 2, the overlapping portions 34k and 34l are arranged on the flat surface 21c side. Therefore, the laminated steel plates are tightened along the circumferential direction θ by winding the armature winding via the insulator 3. Thereby, in the teeth 2 surrounded by the insulator 3, the movement of the laminated steel plates in the stacking direction is prevented. Therefore, the effect of reducing the noise generated from the motor is brought about similarly to the first embodiment.

  In addition, when the direction where the some steel plate which comprises the teeth 2 is laminated | stacked is the radial direction R, the flat surface 21c does not necessarily appear in the teeth 2. FIG. However, the main body 21 is tapered on the radial direction R side when viewed from the axial direction Z in order to prevent the armature winding wound around the teeth 2 from being too far from the main body 21. On the other hand, since the teeth 2 are arranged annularly when viewed from the axial direction Z, the main body 21 is opposite to the radial direction R (on the central axis side of the annular arrangement) so that the positions do not interfere with each other between the adjacent teeth 2. ) But it will be tapered. Therefore, the flat surface 21c usually appears on the tooth 2.

  It is desirable that the flat surface 21c overlaps the outer shape of the embedded portion 23 when viewed from the axial direction Z. In order to reduce interference between adjacent armature windings, it is desirable that the width of the main body 21 in the circumferential direction θ is equal to or less than the width of the embedded portion 23. This is because it is not desired to be less than the width of the embedded portion 23.

  When the steel plates are stacked in the radial direction R, the overlapping portions 34k and 34l function to absorb the error in the steel plate thickness. This is because the displacement of the side surface portions 351 and 361 along the radial direction R is allowed as long as the side surface portions 351 and 361 overlap each other along the radial direction R.

  The insulator 3 further includes top surface portions 352 and 362. The top surface portion 352 exhibits a third end portion 354g and a fourth end portion 354h, and the top surface portion 362 exhibits a third end portion 364h and a fourth end portion 364g. The third end portions 354g and 364h are continuous with the first end portions 354k and 364l, respectively, and extend perpendicular to the axial direction Z. The fourth end portions 364g and 354h are continuous with the second end portions 364k and 354l, respectively, and extend perpendicular to the axial direction Z.

  The third end 354g and the fourth end 364g overlap at the overlapping portion 34g, and the third end 364h and the fourth end 354h overlap at the overlapping portion 34h. The overlapping portion 34g is positioned on the axial direction Z side of the overlapping portion 34k, and the overlapping portion 34h is positioned on the overlapping portion 34l. In other words, the third end portion 354g and the fourth end portion 364g overlap at a position on the axial direction Z side where the first end portion 354k and the second end portion 364k overlap, and the third end portion 364h and the fourth end portion 364g overlap each other. The end portion 354h overlaps at a position on the axial direction Z side where the first end portion 364l and the second end portion 354l overlap.

  10 to 12 illustrate the case where the overlapping portions 34g and 34h extend parallel to the circumferential direction θ, but may extend in a direction having a component in the radial direction R.

  By providing such top surface portions 352 and 362, insulation between the flange portion 22 and the armature winding can be obtained even when the flange portion 22 is provided in the tooth 2. In the insulator 3, although a boundary is generated between the third end 354 k and the fourth end 364 k (or / and further between the third end 364 l and the second end 354 k), both overlap each other. The insulation distance can be increased at the position.

  In the first embodiment, it is desirable that the flange portion 22 protrudes from the top surface portions 352 and 362 in the axial direction Z in the same manner that the flange portion 22 desirably protrudes from the top surface portions 312 and 322. . This is an advantage that the so-called air gap is not increased unnecessarily.

  For example, in the axial direction Z, it is desirable that the thickness of the flange portion 22 is equal to or greater than the thickness of the top surface portions 352 and 362. Even if the third end portion 354g and the fourth end portion 364g (or / or the third end portion 364h and the second end portion 354g) overlap without changing the thickness thereof, the insulator 3 moves toward the axial direction Z. This is because it does not exceed the buttock 22.

  The insulator 3 further includes bottom surface portions 353 and 363. The bottom surface portion 353 has a fifth end portion 354i (illustrated in FIG. 15 described later) and a sixth end portion 354j, and the bottom surface portion 363 has a fifth end portion 364j and a sixth end portion 364i.

  The fifth end portions 354i and 364j are continuous with the first end portions 354k and 364l, respectively, and extend perpendicular to the axial direction Z. The sixth end portions 364i and 354j are continuous with the second end portions 364k and 354l, respectively, and extend perpendicular to the axial direction Z. The fifth end portion 354i and the sixth end portion 364i overlap at the overlapping portion 34i, and the fifth end portion 364j and the sixth end portion 354j overlap at the overlapping portion 34j.

  The overlapping portion 34i is located on the opposite side of the axial direction Z, and the overlapping portion 34j is located on the opposite side of the axial direction Z. In other words, the fifth end 354g and the sixth end 364g overlap at a position opposite to the axial direction Z of the position where the first end 354k and the second end 364k overlap, and the fifth end 364j The sixth end portion 354j overlaps at a position opposite to the axial direction Z where the first end portion 364l and the second end portion 354l overlap.

  10 to 12 illustrate the case where the overlapping portions 34i and 34j extend in parallel to the circumferential direction θ, but may extend in a direction having a component in the radial direction R.

  By providing such bottom surface portions 353 and 363, even if the yoke 1 (see FIGS. 7 to 9) is provided on the side opposite to the axial direction Z with respect to the tooth 2 on which the insulator 3 is provided, the yoke 1 is insulated from the armature winding.

  In the insulator 3, although a boundary is generated between the fifth end 354 i and the sixth end 364 i (or / and further between the fifth end 364 j and the sixth end 354 i), both overlap each other. The insulation distance can be increased at the position.

  FIG. 13 is a side view showing the configuration of the overlapping portion 34g, and shows the side as seen from the direction opposite to the circumferential direction θ.

  In FIG. 13, the third end 354g and the sixth end 364g have thicknesses d10 and d9, respectively. Here, a form in which the thickness along the axial direction Z of the top surface portions 352 and 362 other than the overlapping portion 34g is assumed to be the thickness t and the relationship d9 + d10 = t is satisfied is illustrated.

  Thus, as for the insulator 3, it is desirable that the thickness of an overlap part and the thickness in other positions are equal. This is because the thickness at the overlapping portion can be reduced. Naturally, such a thickness relationship is desirable not only in the top surface portions 352 and 353 of the present embodiment, but also in the top surface portions 312 and 322 shown in the first embodiment. This is because the demand for thickening the flange portion 22 is eased.

  In particular, as in the present embodiment, it is desirable that the above-described thickness relationship is satisfied in the bottom surface portions 353 and 363 that present the overlapping portions 34i and 34j aligned in the circumferential direction θ with respect to the tooth 2. The reason for this will be described below.

  14 and 15 are side views showing different configurations of the overlapping portion 34i, and show side surfaces as viewed from the direction opposite to the circumferential direction θ.

  In FIG. 14, the thicknesses of the fifth end 354i and the sixth end 364i are set to d11 and d12, respectively. In this example, the thickness along the axial direction Z of the bottom surface portions 353 and 363 other than the overlapping portion 34i is assumed to be the thickness t, and the relationship of d11 + d12 = t is satisfied.

  In FIG. 15, the fifth end portion 354 i maintains another thickness d <b> 12 of the bottom surface portion 353, and the sixth end portion 364 i maintains another thickness d <b> 11 of the bottom surface portion 363. If d11 = d12 = t, the thickness along the axial direction Z of the insulator 3 at the position where the fifth end portion 354i and the sixth end portion 364i overlap (overlapping portion 34i) It is thicker than the thickness and almost doubled. This is desirable from the viewpoint of taking an insulation distance as much as the thickness of the overlapping portions 34k and 341 in the side surface portions 351 and 361. However, when a step occurs in the overlapping portion 34i (or further overlapping portion 34j) in this way, the shape of the yoke 1 becomes unfavorable.

  FIG. 16 is a perspective view showing a process of connecting the yoke 1 and the tooth 2 provided with the insulator 3. Similarly to FIGS. 7 and 8, only one tooth 2 is shown here in order to avoid the complexity of illustration. A rotation shaft (not shown) is inserted into the hole 10.

  The yoke 1 needs to be provided with the second groove 12 for embedding the overlapping portions 34 i and 34 j in addition to the first groove 11 for embedding the buried portion 23. However, since the overlapping portions 34 i and 34 j are arranged in the circumferential direction θ with respect to the tooth 2, the second groove 12 needs to be arranged in the circumferential direction θ with respect to the first groove 11.

  When a rotating magnetic field is generated using the teeth 2, the magnetic path of the rotating magnetic field flowing in the yoke 1 is along the circumferential direction θ. Therefore, the second groove 12 provided in the circumferential direction θ with respect to the tooth 2 obstructs the magnetic path through which the rotating magnetic field flows in the yoke 1.

  From the above, in the bottom surface portions 353 and 363, the overlapping portions 34i and 34j have the same thickness as the other thicknesses, and the overlapping portions 34i and 34j do not protrude to the side opposite to the axial direction Z. It is desirable.

  In the bottom surface portions 313 and 323 (or bottom surface portions 353 and 363), when the thickness of the overlapping portions 34c and 34d (or the overlapping portions 34i and 34j) is equal to the thickness at other positions, the thickness is It is desirable that the thickness is equal to twice the thickness (thickness in the direction perpendicular to the axial direction Z) at the side surface portions 311 and 321 (or the side surface portions 351 and 361). Also in the bottom surface portions 313 and 323 (or the bottom surface portions 353 and 363), the thickness is approximately the same as the thickness of the overlapping portions 34e and 34f (or the overlapping portions 34k and 34l) in the side surface portions 311 and 321 (or the side surface portions 351 and 361). In addition, the insulation distance is taken.

  It is also desirable that the first to sixth end portions have the same thickness or narrow toward the respective tips. This is because the so-called draft taper is exhibited in the resin molding, and the manufacturing becomes easy. Further, the insulator 3 is fitted into the teeth without being deformed.

Third embodiment.
FIG. 17 is a perspective view illustrating the configuration of an insulator 3 according to the third embodiment of the invention. FIG. 18 is a cross-sectional view illustrating the configuration. The cross section is a cross section viewed along the direction opposite to the circumferential direction θ at the position of the overlap 34f. In FIG. 18, the position of the armature winding 7 is virtually shown, so that it is drawn with a chain line.

  The insulator 3 has a configuration in which the top surface portions 312 and 322 are removed from the insulator 3 shown in the first embodiment. In the first embodiment, the top surface portions 312 and 322 are provided in order to take insulation between the flange portion 22 of the tooth 2 and the armature winding, but the insulating film 8 is provided instead of these. Yes.

  Since the insulating film 8 is inserted between the flange portion 22 and the side surface portion 321, insulation between the flange portion 22 and the armature winding 7 can be obtained.

  The insulating film 8 is cut at a position 80. By the said cutting | disconnection, it becomes easy to insert the insulating film 8 between the collar part 22 and the side part 321. FIG.

  The insulating film 8 is cut to avoid the position where the first end 314e and the second end 324e overlap and the position where the first end 324f and the second end 314f overlap. In other words, the position 80 is different from the positions of the overlapping portions 34e and 34f. Therefore, the cutting of the insulating film 8 does not impair the creepage distance in the overlapping portions 34e and 34f.

  FIG. 19 is a plan view of the structure shown in FIGS. 17 and 18 when viewed from the direction opposite to the axial direction Z. FIG. A plurality of insulating films 8 are arranged so as to overlap along the axial direction Z. Thereby, the distance of the collar part 22 and the side part 321 can be taken long.

  Moreover, the positions 80 at which the respective insulating films 8 are cut differ from each other. As a result, the cut portions of the plurality of insulating films 8 do not communicate with each other, so that the creepage distance is not impaired.

  The insulating film 8 has a tongue 81 extending along the axial direction Z. The tongue portion 81 has a position where the first end portion 324f and the second end portion 314f overlap between the side surface portions 311 and 321 and the tooth 2 (more specifically, the main body 21) (or further, the first end portion 314e and At least a part of the position where the second end portion 324e overlaps is covered. Thereby, the creeping distance in the overlapping portions 34f and 34e can be increased.

  It is desirable that the side surface portions 311 and 321 have the concave portion 30 that houses the tongue portion 81. This is because even if the insulating film 8 is provided, the insulator 3 and the teeth 2 are arranged in close contact with each other.

  The insulating film 8 may be provided in place of the top surface portions 352 and 362 of the insulator 3 in the second embodiment. In that case, the insulating film 8 is interposed between the side surface portions 351 and 361 and the flange portion 22.

  When the insulating film 8 is cut, the cut position 80 is different from the positions of the overlapping portions 34k and 34l. Further, the tongue 81 has a position where the first end 354k and the second end 364k overlap between the side surfaces 351, 361 and the tooth 2 (more specifically, the main body 21) (or further, the first end 364l). At least a part of the position where the second end portion 354l overlaps is covered. In this case, it is desirable that the side surface portions 351 and 361 have the concave portion 30 that houses the tongue portion 81.

Deformation.
The first to third embodiments may be combined and modified in any way as long as the specific effects are not impaired. For example, the overlapping portion may be provided in both the radial direction R and the circumferential direction θ with respect to the tooth 2.

  The direction in which the plurality of steel plates constituting the tooth 2 are stacked may be the radial direction R or the circumferential direction θ. When stacked in the radial direction R, the flange portion 22 protrudes from the main body 21 along the circumferential direction θ, and when stacked in the circumferential direction θ, the flange portion 22 protrudes from the main body 21 along the radial direction R. It is desirable. This is because the process of manufacturing small steel plates constituting only the flange portion 22 and laminating them is cumbersome and avoids such a process.

  Further, the side surface portion 311, the top surface portion 312, and the bottom surface portion 313 shown in the first embodiment are integrally formed as the first portion 31, and the side surface portion 321, the top surface portion 322, and the bottom surface portion 323 are integrally formed as the second portion. 32 may be configured. Alternatively, the side portions 311 and 312 may be continuous at the position indicated as the overlapping portion 34f without providing the second end portion 314f and the first end portion 314f. The insulator 3 is elastically deformed, and the first end portion 314e and the second end portion 324e can be attached to the tooth 2 with the U-shaped opening.

  Similarly, the top surface portions 312 and 322 may be continuous at the position indicated as the overlapping portion 34b without providing the fourth end portion 314b and the third end portion 324b. Further, the bottom end portions 313 and 323 may be continuous at the position indicated as the overlapping portion 34d without providing the sixth end portion 314d and the fifth end portion 324d.

  Similarly, the side surface portion 351, the top surface portion 352, and the bottom surface portion 353 shown in the second embodiment are integrally configured as the first portion 35, and the side surface portion 361, the top surface portion 362, and the bottom surface portion 363 are integrated as the first. It may be configured as a two-part 36. Or the structure where the 1st part 35 and the 2nd part 36 continue in the position shown as the superimposition part 34j, 34l, 34h may be sufficient.

  Conversely, the insulator 3 may be composed of three or more parts. Even in that case, each of the side surface portions has end portions corresponding to the first end portion and the second end portion described above, and the first end portion of one side surface portion is the other side surface portion (more specifically, Is overlapped with the second end portion of the side surface portion adjacent to the one side surface portion.

  It is desirable to configure the insulator 3 with a plurality of parts in that the effect of the above-described superposition using the first end portion to the sixth end portion can be enjoyed even if the elastic deformation of the material is small.

  Moreover, you may provide the structure (refer patent documents 4-6) for hooking an armature winding and its terminal in a top surface part or a bottom face part. 20 and 21 are perspective views illustrating the configuration of the groove 30 by taking the top surface portion 352 as an example. Of course, the groove 30 may be provided in the top surface portions 312, 322, and 352 and the bottom surface portions 313, 323, 353, and 363.

  In FIG. 20, the groove 30 has a form that penetrates through the top surface portion 352 and opens toward the periphery. In FIG. 21, the groove 30 is provided in a box 30A provided on the top surface portion 352, and has a form that penetrates the top surface portion 352 and the box 30A and opens toward the periphery.

  The groove 30 may be provided on the inner peripheral side or may be provided on the outer peripheral side. Or the groove | channel 30 for hooking the conducting wire which takes out a connecting wire and a neutral point may be provided in an inner peripheral side, and the groove | channel 30 for hooking a lead wire may be provided in the outer peripheral side.

  Or the groove | channel 30 may fulfill | perform the function which hooks the terminal connected to an armature winding. The terminal may be commonly called a deposit terminal. Alternatively, even when the armature is completed, the groove 30 does not hook the armature winding or the terminal, and the groove 30 may serve to hook the armature winding or the terminal while the armature is being created. Good.

  The teeth 2 surrounded by the insulator 3 can be used for the armature core. A motor using the armature core is used for driving a compressor, for example. The said compressor compresses the refrigerant | coolant of an air conditioner, for example.

  As a form of the motor using the armature core, a configuration including one armature using the armature core and one field element facing each other in the axial direction Z is assumed.

  Alternatively, as the armature core, a configuration in which the tooth 2 is provided in the axial direction Z with respect to the yoke 1 and the tooth 2 is further provided in the opposite direction to the axial direction Z is also assumed. In this case, as a motor using the armature, a configuration including the armature and two field elements facing each other across the armature in the axial direction Z is assumed.

  Alternatively, a configuration in which a pair of armatures using the armature core is used and the armatures face each other across the field element in the axial direction Z is also assumed.

It is a perspective view which shows the structure of the insulator concerning 1st Embodiment of this invention. It is a perspective view which shows the process in which a tooth is enclosed by an insulator. It is a perspective view which shows the process in which a tooth is enclosed by an insulator. It is a perspective view which shows the structure which abbreviate | omitted the structure of the axial direction side from this including a collar part. It is a top view which shows the structure which abbreviate | omitted the structure of the axial direction side from this including a collar part. It is a side view which shows the structure of a superimposition part, and shows the side surface seen along radial direction. It is a perspective view which shows the process of connecting a yoke and the teeth provided with the insulator. It is a perspective view which shows the process of connecting the other yoke and the teeth provided with the insulator. It is a perspective view which shows the structure of another yoke. It is a perspective view which shows the structure of the insulator concerning 2nd Embodiment of this invention. It is a perspective view which shows the process in which a tooth is enclosed by an insulator. It is a top view which shows the structure which abbreviate | omitted the structure of the axial direction side from this including a collar part. It is a side view which shows the structure of an overlapping part, and shows the side surface seen from the direction opposite to the circumferential direction. It is a side view which shows the structure of an overlapping part. It is a side view which shows the other structure of an overlapping part. It is a perspective view which shows the process of connecting a yoke and the teeth provided with the insulator. It is a perspective view which illustrates the composition of the insulator concerning a 3rd embodiment of this invention. It is sectional drawing which illustrates the structure of the insulator concerning 3rd Embodiment of this invention. It is the top view which looked at the structure of the insulator concerning the 3rd Embodiment of this invention from the direction opposite to an axial direction. It is a perspective view which illustrates the composition of a slot taking a top part as an example. It is a perspective view which illustrates other composition of a slot taking a top surface part as an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Yoke 11 1st groove | channel 12 2nd groove | channel 2 Teeth 21a, 21b, 21c, 3e, 3f, 3k, 3l Flat surface 22 Gutter part 23 Embedded part 3 Insulator 30 Recessed part 311, 321, 351, 361 Side part 312, 322 , 352, 362 Top surface portion 313, 323, 353, 363 Bottom surface portion 314e, 324f, 354k, 364l First end portion 324e, 314f, 364k, 354l Second end portion 314a, 324b, 354g, 364h Third end portion 324a, 314b, 364g, 354h Fourth end 314c, 324d, 354i, 364j Fifth end 324c, 314d, 364i, 354j Sixth end 8 Insulating film 81 Tongue Z direction

Claims (28)

In an armature that generates a rotating magnetic field in a predetermined direction (Z), at least one of a plurality of teeth (2) arranged in an annular shape with the predetermined direction as an axis is perpendicular to the predetermined direction. Enclosing armature insulator (3),
A first end (314e, 324f; 354k, 364l) extending in the predetermined direction and a second end (324e, 314f; 364k, 364k, extending in the predetermined direction and overlapping the first end) 354l), and at the position where the first end portion and the second end portion overlap each other, the side surface portions (311, 321; 351, 361) are thicker than the other positions.
An insulator made of molded resin.   The insulator (3) according to claim 1, wherein each of said teeth (2) is individually enclosed. Insulator (3) according to claim 2,
A plurality of teeth (2) arranged in an annular shape around the predetermined direction (Z), each of which is surrounded by the insulator in a direction perpendicular to the predetermined direction;
An armature core comprising an insulating film (8),
Each of the teeth has a flange portion (22) extending at an end portion on the predetermined direction (Z) side,
The insulating film is an armature core interposed between the flange portion and the side surface portions (311, 321; 351, 361).   The insulating film (8) is cut to avoid a position where the first end (314e, 324f; 354k, 364l) and the second end (324e, 314f; 364k, 354l) overlap. Item 4. The armature core according to Item 3.   The armature core according to claim 4, wherein the insulating film (8) has a plurality of different cut portions (80) arranged in a stacked manner.   The insulating film (8) includes the first end portion (314e, 324f; 354k, 364l) and the second end portion (324e, 314f) between the side surface portions (311 321; 351, 361) and the teeth. An armature core according to claim 3, further comprising a tongue portion (81) covering at least a part of a position where 364k and 354l) overlap.   The armature core according to claim 6, wherein the side surface portion (311, 321; 351, 361) has a recess (30) for accommodating the tongue portion (81). The side surface portions (311, 321; 351, 361) have a flat surface (3e, 3f; 3k, 3l) on the teeth side, and are thicker than the other positions at the position of the flat surface.
The insulator according to claim 2, wherein the first end portion (314e, 324f; 354k, 364l) and the second end portion (324e, 314f; 364k, 354l) overlap each other to form the flat surface. The insulator (3) according to claim 8,
An armature core comprising: a plurality of teeth (2) arranged annularly around the predetermined direction (Z), each of which is surrounded by the insulator in a direction perpendicular to the predetermined direction. ,
Each of the teeth is an armature core composed of a plurality of steel plates stacked in a direction (R, θ) orthogonal to the predetermined direction. At least one of the teeth (2) has an end face (21c) parallel to the lamination direction of the steel plates,
The flat surface (3k; 3l) of the insulator (3) surrounding the teeth is in contact with the end surface;
The armature core according to claim 9, wherein the first end (354k, 364l) and the second end (364k, 354l) overlap on the end face side. The yoke (1) which arrange | positions the said teeth (2) cyclically | annularly
Further comprising
The teeth have an embedded portion (23) that protrudes in the opposite direction to the predetermined direction (Z) with respect to the side surface portions (311, 321; 351, 361) and is embedded in the yoke.
The stacking direction of the steel plates in the teeth is a radial direction (R) with the predetermined direction (Z) as an axis at the position of the teeth,
The armature core according to claim 10, wherein the end surface (21c) overlaps with an outer shape of the embedded portion (23) when viewed from the predetermined direction. The flat surfaces (3e; 3f) of the insulator (3) surrounding the teeth are arranged on the side surfaces (21a, 21b) of the teeth in the direction in which the plurality of steel plates are laminated,
The armature core according to claim 9, wherein the first end (314e; 324f) and the second end (324e; 314f) overlap on the side surface side.   The outer shape of the side surface portion (311, 321; 351, 361) viewed from the predetermined direction (Z) is rounded at a bent portion thereof. Insulator (3). A third end (314a, 324b; 354g, 364h) that is continuous with the first end (314e, 324f; 354k, 364l) and extends perpendicular to the predetermined direction (Z); and the second end A top surface portion that is continuous with the portion (324e, 314f; 364k, 354l) and has a fourth end (324a, 314b; 364g, 354h) that extends perpendicularly to the predetermined direction and overlaps the third end portion. (312, 322; 352, 362)
Further comprising
The third end portion and the fourth end portion overlap each other at a position on the predetermined direction side where the first end portion and the second end portion overlap each other. The insulator according to any one of the above. An insulator (3) according to claim 14,
An armature core comprising: a plurality of teeth (2) arranged annularly around the predetermined direction (Z), each of which is surrounded by the insulator in a direction perpendicular to the predetermined direction. ,
Each of the teeth has a flange portion (22) extending at an end portion on the predetermined direction (Z) side,
The armature core in which the flange portion protrudes from the top surface portion (312, 322; 352, 362) in the predetermined direction (Z).   The armature core according to claim 15, wherein in the predetermined direction (Z), the thickness of the flange portion (22) is equal to or greater than the thickness of the top surface portion. A fifth end (314c, 324d; 354i, 364j) extending perpendicularly to the predetermined direction (Z) continuously with the first end (314e, 324f; 354k, 364l); and the second end A bottom surface portion having a sixth end portion (324c, 314d; 364i, 354j) that extends vertically in the predetermined direction and overlaps the fifth end portion continuously with the portion (324e, 314f; 364k, 354l). (313, 323; 353, 363)
Further comprising
The first end and the second end overlap each other at a position opposite to the predetermined direction, and the fifth end and the sixth end overlap. The insulator according to any one of 13, 14 and 14. Insulator (3) according to claim 17,
A plurality of the teeth (2) each surrounded by the insulator in a direction perpendicular to the predetermined direction;
An armature core comprising a yoke (1) that annularly arranges a plurality of the teeth (2) around the predetermined direction (Z);
The teeth have an embedded portion (23) protruding to the opposite side to the predetermined direction with respect to the bottom surface portion (313, 323; 353, 363),
The yoke opens to the predetermined direction side to embed the first groove (11) to embed the embedded portion, and opens to the predetermined direction side to embed the fifth end and the sixth end. An armature core having a second groove (12) to be engaged.   The armature core according to claim 18, wherein the second groove (12) penetrates the yoke (1) in the predetermined direction (Z).   The armature core according to any one of claims 18 and 19, wherein the first groove (11) penetrates the yoke (1) in the predetermined direction (Z). The fifth end portion (314c, 324d) and the sixth end portion (324c, 314d) of the insulator have a radial direction at a position of the tooth where the insulator is provided with the predetermined direction (Z) as an axis ( R), arranged alongside the teeth,
The armature core according to any one of claims 18 to 20, wherein the second groove (12) of the yoke (1) is arranged in a radial direction with respect to the first groove.   The thickness of the bottom surface portion (313, 323; 353, 363) in the predetermined direction is such that the fifth end portion (314c, 324d; 354i, 364j) and the sixth end portion (324c, 314d; 364i, 354j). 18. The insulator according to claim 17, wherein the position where the two are overlapped and the other position are equal.   The thickness of the bottom surface portion (313, 323; 353, 363) in the predetermined direction is twice the thickness of the side surface portion (311, 321; 351, 361) in a direction perpendicular to the predetermined direction. 23. The insulator of claim 22, wherein   The thickness of the side surface portions (311, 321; 351, 361) in the direction perpendicular to the predetermined direction (Z) is such that the first end portion (314e, 324f; 354k, 364l) and the second end portion ( 324e, 314f; 364k, 354l) is at least twice as large as the other positions (d1 + d2> 2t; d3 + d4> 2t; d5 + d6> 2t; d7 + d8> 2t), claims 1, 2, 8, 13, The insulator according to any one of 14, 17, 22, and 23. The thickness of the side surface part (311, 321) in the direction perpendicular to the predetermined direction (Z) is a position where the first end part (314e, 324f) and the second end part (324e, 314f) overlap. At least twice the other positions (d1 + d2>2t; d3 + d4> 2t),
The flat surfaces (3e, 3f) are arranged in a direction perpendicular to the predetermined direction (Z) from a position where the first end portion and the second end portion overlap each other at the other position of the side surface portion. The insulator according to claim 8, wherein the insulator exists in the extending direction apart by a thickness (t) or more.   The insulator according to claim 1, wherein the first end portion (314e, 324f; 354k, 364l) and the second end portion (324e, 314f; 364k, 354l) have the same thickness or narrow toward the tip.   The first end portion (314e, 324f; 354k, 364l) and the second end portion (324e, 314f; 364k, 354l) are tapered, and the side surface portion in a direction perpendicular to the predetermined direction (Z). 27. The insulator according to claim 26, wherein a thickness of the first end portion and the second end portion overlap each other at a position where the first end portion and the second end portion overlap each other. A plurality of the side portions are provided,
The first end (314e / 324f; 354k / 364l) of one of the side surfaces (311/321; 351/361) is the second end of the other side surface (321/311; 361/351). The insulator according to claim 1, wherein the insulator is superposed on (324e / 314f; 364k / 354l).

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