JP2006187073A - Insulator, stator, and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To elevate the space factor of a coil wound around a tooth part, making the most of the slot space of a stator core effectively, and elevate the assembly work efficiency by fixing the winding start part of the coil. <P>SOLUTION: This insulator 36 is mounted on the end of the tooth part 33 of each split core 31 of a stator core which projects a plurality of teeth parts 33 inward in its diametrical direction. This possesses a coil spool 38 which bulges outward from the end and a guide groove 39 which guides the winding start 30a of the coil 30 inward in its diametrical direction from outside in its diametrical direction, being slit in the coil spool 38. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an insulator used for a stator core around which a coil is wound as a stator of a motor.

  2. Description of the Related Art Conventionally, an inner rotor type brushless motor is known in which a rotor having a magnet disposed on the outer periphery is disposed as a rotor inside a stator around which a plurality of coils are wound. The stator is configured by winding a coil around a cylindrical stator core in which a tooth portion for winding the coil protrudes inward. Also, in the stator core, the space inside the radial direction between adjacent tooth portions becomes narrow, and the winding work of the coil tends to be complicated, so that the stator core is divided for each tooth portion, There has been invented one in which only a part of the core is connected and the split core can be linearly deformed during winding work (for example, Patent Documents 1 to 3).

JP 2002-58181 A JP-A-10-271770 JP-A-9-191588

  FIG. 13 shows the cross-sectional shape of one split core. As shown in the figure, the split core 90 has a substantially T-shaped tooth portion 92 from a yoke portion 91 that is an outer peripheral portion of the stator core. In this way, one split core 90 is formed by laminating steel plates from which the yoke portion 91 and the teeth portion 92 are cut. An insulator 93 is provided around the teeth portion 92 to be insulated, and a coil (not shown) is wound around the teeth portion 92 so as to circulate around the teeth portion 92. The slot space X, which is the space around the tooth portion 92 around which the coil is wound, is narrower on the radially inner side than the radially outer side of the tooth portion 92. In detail, since each divided core 90 is connected in an annular shape so that the tooth portion 92 protrudes radially inward, the radially inner side of the tooth portion 92 is adjacent to another divided portion adjacent to the radially outer side. It approaches the teeth portion 92 of the core 90. Therefore, in order to wind adjacent coils (not shown) around the tooth portion 92 so as not to contact each other, the slot space X must be narrower on the radially inner side than the radially outer side of the tooth portion 92. .

  When winding a coil around the tooth portion 92 of the split core 90, there are a method of starting winding from the radially outer side of the tooth portion 92 and a method of starting winding from the radially inner side, but from the radially outer side of the tooth portion 92 In the method of starting winding, the slot space X may not be used effectively due to the shape of the split core 90, the wire diameter of the coil, the number of turns, and the like. For example, as shown in FIG. 14, the coil 94 is wound in the order in which numbers are attached from the radially outer side of the tooth portion 92, and the eighth turn is wound on the innermost radial direction of the tooth portion 92, so that the first layer coil is wound. After the formation of 94a, the second layer coil 94b is wound from the radially inner side to the radially outer side. However, if the coil 94b of the second layer is wound from the most radially inner side of the tooth portion 92, it protrudes to the outside of the slot space X, so that it has returned from the innermost radial direction of the tooth portion 92 to the radially outer side by the required number of turns. The coil 94b of the second layer is wound from the position. The transition portion 94c between the 8th turn which is the last of the first layer coil 94a and the 9th turn which is the first of the second layer coil 94b also needs to be accommodated inside the slot space X. As shown in the figure, if the 9th turn of the second layer coil 94b is wound so as to overlap the 4th and 5th turns of the first layer coil 94a, the 9th turn coil 94b is wound. Fits inside the slot space X, but as shown by the oblique lines in the figure, a part of the transition portion 94c protrudes to the outside of the slot space X, so that the coil 94a of the first layer is moved to the eighth radially inner side. It is not possible to wind until the lap. As a result, the number of turns of the coil 94 of the teeth portion 92 is reduced. As a result, there arises a problem that the slot space X cannot be used effectively, that is, a space factor of the coil 94 is lowered, and it is difficult to improve motor performance and downsize.

  On the other hand, in the method of starting to wind the coil 94 from the radially inner side of the tooth portion 92, as shown in FIG. 15, the eighth turn is wound on the outermost radial direction of the tooth portion 92 to form the first layer coil 94a. After that, the second layer coil 94b is wound from the radially outer side toward the radially inner side. However, since the radially outer slot space X is wider than the radially inner side, After the eighth turn of the first layer coil 94a is wound on the outer side in the radial direction, the second layer coil 94b is wound so as to overlap the seventh and eighth turns from the position immediately outside. it can. Therefore, there is an advantage that the slot space X can be effectively used as compared with the method of starting winding the coil 94 from the radially outer side of the tooth portion 92 as described above.

  However, as shown in the drawing, if the winding start on the radially inner side of the tooth portion 92 is a single layer of the coil 94, there is a problem that the winding start portion of the coil 94 is not fixed and is easy to move. As will be described in detail, the coil 94 wound around the tooth portion 92 of the split core 90 is continuously wound around the plurality of split cores 90, and each split core 90 is connected by a jumper. For example, in the case of a three-phase brushless motor, a plurality of divided cores 90 formed as one set by such a jumper are combined in a ring shape to form a stator. If the connecting wire connecting the split cores 90 is bent at the time of assembly, the winding start portion of the coil 94 moves away from the teeth portion 92. Thus, if the winding start part of the coil 94 moves freely, workability | operativity at the time of assembling the division | segmentation core 90 as a stator will be bad, and operations, such as drawing-out of the coil 94, can be automated using an industrial robot etc. There is a problem that it is difficult.

  An object of the present invention is to increase the space factor of a coil wound around a tooth portion by effectively utilizing the slot space of a stator core, and to improve the assembly workability by fixing the winding start portion of the coil. And

  An insulator according to the present invention is an insulator that is attached to at least a rotor axial end portion of a teeth core of a stator core in which a plurality of tooth portions protrude radially inward, from the rotor axial end portion. A coil winding portion that bulges outward, and a guide groove that is recessed in the coil winding portion and accommodates the winding start portion of the coil so as to guide the coil from the radially outer side to the radially inner side. is there. When the coil is wound around the teeth portion of the stator core to which the insulator is mounted, the winding start portion of the coil is accommodated in the guide groove and guided from the radially outer side to the radially inner side, A coil is wound around the coil winding portion from the radially inner side. Further, since the coil is wound so as to cover the winding start portion of the coil accommodated in the guide groove, the winding start portion of the coil that becomes the crossover is fixed by the coil wound around the coil winding portion. . In the present invention, the rotor axial direction refers to an end of the stator core in the rotor axial direction when the stator core is combined with the rotor as a stator to constitute a motor.

  In the insulator according to the present invention, the guide groove may be any one of a radial portion formed from a radially outer side to a radially inner side along a radial direction, and an inner diameter end of the radial portion from the tooth portion. It consists of the circumferential direction part formed in one side part. With this guide groove, the winding start portion of the coil is guided radially from the radially outer side to the radially inner side, and then curved in an L shape in the circumferential direction to be surely guided to the most radially inner side of the tooth portion. It is burned.

  In the insulator according to the present invention, the guide groove protrudes from a side where the circumferential direction portion is formed at an upper end in the vicinity of the inner end of the radial direction portion, and the coil accommodated in the guide groove is provided. A locking piece to be locked is provided. When the coil is wound around the teeth portion by this locking piece, the winding start portion of the coil accommodated in the guide groove is prevented from coming off from the guide groove.

  Also, in the insulator according to the present invention, the coil winding portion is a side wall side of the radial direction portion of the guide groove, and an upper end portion on the side where the circumferential direction portion is not formed is notched. . Thereby, it becomes easy to store the winding start part of the coil in the guide groove from the side where the upper end part is notched.

  Further, according to the present invention, in the insulator, a binding portion that binds a winding end portion of the coil is formed on a radially outer side. Thereby, both the winding start part of the coil used as a crossover and the winding end part of a coil are fixed.

  In the insulator according to the present invention, the stator core is composed of divided cores divided for each tooth portion. When a coil is continuously wound around a plurality of split cores and the split cores are connected by crossovers, the crossovers are fixed by the insulators, and the crossovers are improved when the stator is assembled.

  Further, in the stator according to the present invention, the insulator is mounted on the teeth portion of the stator core, and the winding start portion of the coil is accommodated in the guide groove and guided from the radially outer side to the radially inner side. A coil is wound around the coil winding portion so as to go around. As a result, the coil is wound around the coil winding portion from the inner diameter side of the tooth portion, and the coil is wound so as to cover the winding start portion of the coil accommodated in the guide groove. The coil winding start portion is fixed by the coil wound around the coil winding portion.

  In the stator according to the present invention, the winding start portion of the coil is a single layer coil. Even if the winding start portion of the coil is one layer, the winding start portion is fixed by the insulator.

  A motor according to the present invention includes the stator. The insulator makes it easy to draw a connecting wire between the respective tooth portions, and the assembly work of the motor becomes easy. Further, since the space factor of the coil is high, the motor performance is improved.

  According to the insulator according to the present invention, the winding start portion of the coil is accommodated in the guide groove and guided from the radially outer side to the radially inner side. Therefore, the slot space of the stator core is effectively used to wind the coil portion around the tooth portion. The space factor of the coil to be played can be increased. Further, since the coil winding start portion is fixed by the coil wound around the coil winding portion, the assembly workability of the stator is improved.

  Moreover, since the coiling start portion of the coil is prevented from being detached from the guide groove by the locking piece provided in the guide groove, the coil winding workability is improved.

  Further, in the coil winding portion, the upper end portion on the side wall side of the guide groove in the radial direction where the circumferential direction portion is not formed is notched, so that the coil winding is started from the notched side. It becomes easy to store the start part in the guide groove, and the winding workability of the coil is improved.

  In addition, since the winding end portion of the coil is also fixed by the binding portion provided on the radially outer side of the insulator, the assembly workability of the stator is improved.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 shows a configuration of a brushless motor 1 according to an embodiment of the present invention. The brushless motor 1 is an inner rotor type composed of an inner rotor 2 and an outer stator 3, and the inner rotor 2 is disposed in the inner space of the outer stator 3 with a predetermined magnetic gap therebetween. The inner stator 2 is rotated by a rotating magnetic field formed by the outer stator 3. The inner stator 2 is configured such that a rotor yoke 21 is concentric with the shaft 20 on a shaft 20 that is an axis of the motor 1, and a 14-pole cylindrical magnet 22 is fixed to the outer periphery of the rotor yoke 21. On the other hand, the outer stator 3 is formed by connecting twelve divided cores 31 around which a coil 30 is wound in an annular shape. Although not shown in the drawing, the inner rotor 2 and the outer stator 3 are housed in the frame of the motor 1 and are rotatable so that the shaft 20 of the inner rotor 2 protrudes from the frame. It is pivotally supported.

  The rotor yoke 21 is formed by stacking steel plates punched in a disk shape and integrating them by caulking or the like. A through hole is formed at the center of the rotor yoke 21 and the shaft 20 is inserted therethrough. The magnet 22 is a permanent magnet in which magnet particles are sintered in a cylindrical shape, and N poles and S poles are alternately formed in the circumferential direction to form 14 poles. The magnet 22 can be replaced with a so-called ring magnet sintered in a cylindrical shape, and other known magnets such as those divided by magnetic poles can be used. Although not shown in the drawing, a film-like protective member may be provided so as to cover the end surface and outer peripheral surface of the magnet 22 in order to prevent the magnet 22 from scattering and rusting.

  The twelve divided cores 31 constituting the outer stator 3 have the same shape except that they are connected in an annular shape, and each divided core 31 is connected to form one cylindrical stator. It constitutes the core. FIG. 2 shows a divided core group 4 including four divided cores 31. Each of the divided cores 31 is formed by continuously winding one copper wire on each divided core 31 using a flyer type or nozzle type winding machine. They are connected by a crossover 32 to form a group. The divided core groups 4 thus formed as one group are formed for each phase of the U phase, the V phase, and the W phase, and these three divided core groups 4 are arranged in a predetermined manner with the coils 30 as the inner side. The outer stator 3 having 12 slots is configured by being connected in an annular shape and appropriately connected. In this embodiment, the brushless motor 1 having 14 poles and 12 slots is described as an example. However, in the present invention, the number of motor poles and the number of slots are not particularly limited.

  As shown in FIG. 3, the split core 31 is substantially in a plan view in which a tooth portion 33 around which a coil 30 (not shown) is wound protrudes from a core yoke portion 34 that is annularly connected to the other split core 31. In a plan view, a plurality of steel plates having the same shape are laminated and fixed together by bonding, caulking, welding, or the like. The core yoke portion 34 is formed to be one-twelfth of the circumferential width of the cylindrical outer stator 3, and a convex portion 35 is formed on one side of the end surface that contacts the adjacent divided core 31. On the other side, a concave portion (not shown) that fits with the convex portion 35 is formed, and positioning with the adjacent split core 31 is performed by these fittings. The teeth portion 33 protrudes from the core yoke portion 34 inward in the radial direction of the outer stator 3, and the coil 30 is wound through insulators 36 and 37 for insulation.

  As shown in the drawing, the insulators 36 and 37 are so-called end insulators disposed on the upper end surface and the lower end surface which are the axial end portions of the inner rotor 2 in the split core 31. For convenience of explanation, although not shown in the drawing, a flat plate-like insulator is also provided on the side surface of the tooth portion 33, and the side surface, upper end surface and lower end surface of the tooth portion 33 are formed by the insulator and the insulators 36 and 37. It is covered and insulated from the coil 30. In the present embodiment, the insulator 36 disposed on the upper end surface of the split core 31 fixes the winding start portion and the winding end portion of the coil 30. You may arrange | position in any of an end surface. In addition, the insulator 37 may have a common shape with the insulator 36 for the purpose of reducing the cost by making the members common, and the insulator 37 may have other known shapes for reducing the size of the motor 1. It is good. Furthermore, in this Embodiment, the insulators 36 and 37 which cover the end surface of the teeth part 33 of the division | segmentation core 31 and the insulator which covers the side surface of the teeth part 33 were used as another member, However, as shown in FIG. A portion of the insulator 46 corresponding to the side surface 33 may be integrated with the insulator 36.

  5 to 7 show the detailed configuration of the insulator 36. FIG. The insulator 36 is a molded product of an insulating synthetic resin, and has a portion corresponding to the tooth portion 33 and a portion corresponding to the core yoke portion 34 in plan view, as shown in FIG. It is a T-shape that is substantially the same shape as the core 31. A portion of the insulator 36 corresponding to the tooth portion 33 includes a coil winding portion 38 and a guide groove 39. The coil winding portion 38 has a shape corresponding to the tooth portion 33 bulging outward from the axial end of the inner rotor 2, that is, upwardly as shown in FIG. The copper wire is sequentially wound on the coil winding portion 38 in the radial direction to form the coil 30. The shape of the coil winding portion 38 is not limited to the arch shape, but the coil 30 to be wound is formed by making the surface of the coil winding portion 38 a circumferential surface without corners like the arch shape. This is preferable because it does not give a burden to the

  The guide groove 39 is recessed in the coil winding portion 38, and the winding start portion of the coil 30 is accommodated in the guide groove 34, from the radially outer side of the outer stator 3 to the radially inner side. Led. In more detail, the guide groove 39 is a space that is recessed with a predetermined width from the upper surface of the coil winding portion 38 downward in the vertical direction, and as shown in FIGS. The stator 3 includes a radial portion 40 formed from the radially outer side to the radially inner side of the stator 3, and a circumferential portion 41 formed from the inner end of the radial portion 40 to one side portion of the tooth portion 33. The plan view is L-shaped. In the radial direction portion 40, the outer end is opened on the outer peripheral surface of the insulator 34, and the inner end is connected to the circumferential portion 41 without opening on the inner peripheral surface of the insulator 34. In the insulator 34, the radial portion 40 of the guide groove 39 is not opened, and an inner peripheral portion 42 occupying a certain area from the inner peripheral surface protrudes outward from the surface of the coil winding portion 38, and the inner peripheral portion 42 prevents the coil 30 wound around the coil winding part 38 from being collapsed.

  The circumferential portion 41 is formed in the circumferential direction of the outer stator 3 along the inner circumferential portion 42 from the inner end of the radial portion 40. In the insulator 34, one side portion of the teeth portion 33 is formed. Open to the side. In the present embodiment, the circumferential portion 41 is formed so as to open to the side portion of the teeth portion 33 on the left side in plan view of FIG. 6, but the circumferential portion 41 is formed on the left side in the circumferential direction. Then, it is arbitrary whether it is opened to the left side or formed to the right side in the circumferential direction and opened to the right side. By such a guide groove 39, the winding start portion of the coil 30 is guided from the radially outer side of the split core 31 to the radially inner side, and then curved in an L shape in the circumferential direction and close to the inner peripheral portion 42. The teeth portion 33 is surely guided to the inside in the radial direction.

  The coil winding portion 38 is a portion of the guide groove 39 forming the side wall of the radial direction portion 40, on the side where the circumferential direction portion 41 is not formed, that is, the upper right end portion in FIGS. (Dotted line part) is notched. Therefore, as shown in FIG. 7, the right side portion of the coil winding portion 38 that forms the side wall of the radial portion 40 of the guide groove 39 is lower than the left side portion, and does not form an arch shape. Thereby, the winding start part of the coil 30 can be easily stored in the guide groove 39 from the right side where the upper end part is notched.

  Further, in the vicinity of the inner end of the radial portion 40 of the guide groove 39, a locking piece 43 is provided so that a part thereof protrudes from the upper end of the guide groove 39 from the side where the circumferential portion 41 is formed. ing. The locking piece 43 locks the upper side of the coil 30 accommodated in the guide groove 39, and thereby, when the coil 30 is wound around the teeth portion 33 of the split core 31, the guide groove 39. It is possible to prevent the winding start portion of the coil 30 accommodated in the guide 30 from being detached from the guide groove 39.

  The insulator 36 is formed with a binding portion 44 that binds the winding end portion of the coil 30 on a portion corresponding to the core yoke portion 34 of the split core 31, that is, on the radially outer side. Specifically, among the portions corresponding to the core yoke portion 34 of the insulator 36, the side where the circumferential direction portion 41 of the guide groove 39 is formed, that is, the left portion in FIGS. 6 and 7 is higher than the coil winding portion 38. A concave notch 45 is formed in a direction inclined slightly from the radial direction to the left in a plan view from the upper surface vertically downward from the upper surface thereof, and the winding end portion of the coil 30 is provided in the concave notch 45. The winding end portion can be fixed by tying it so as to be accommodated. Of the portion corresponding to the core yoke portion 34 of the insulator 36, the side where the circumferential direction portion 41 of the guide groove 39 is not formed, that is, the right side is the same as the right side portion of the coil winding portion 38 described above from the right side. The coil 30 does not protrude upward like the left portion so that the winding start portion of the coil 30 can be easily stored in the guide groove 39. In addition, it is arbitrary whether the binding portion 44 is provided on the left side or the right side of the portion corresponding to the core yoke portion 34 of the insulator 36. However, as in the present embodiment, the winding end portion of the coil 30 is the coil It is preferable to form the binding portion 44 on the side of the 30 winding direction toward the forward direction because workability is good.

  Hereinafter, a method of winding the coil 30 around the split core 31 will be described with reference to FIGS. 8 to 12. Each figure is a plan view of the split core 31 to which the insulators 36 and 37 are attached, and the tooth portion 33 is directly below the insulator 36.

  As shown in FIG. 8, the winding start portion 30 a of the coil 30 is introduced from the radially outer side of the split core 31. The winding start portion 30 a is accommodated in the radial direction portion 40 of the guide groove 39 of the insulator 36 and guided from the radially outer side of the split core 31 to the radially inner side. Then, after the winding start portion 30 a is guided to the front of the inner peripheral portion 42, the winding start portion 30 a is accommodated in the circumferential direction portion 41 of the guide groove 39, and is bent at a substantially right angle from the radial direction to the circumferential direction. . Then, the first turn of the coil 30 is wound around the teeth portion 33 around the teeth portion 33 on the innermost radial direction. Thereby, the coil 30 can be wound from the innermost radial direction of the teeth portion 33. At this time, in order to wind the coil 30 without slack, the winding start portion 30a is given a pulling force in the winding direction, that is, the left side in the figure, but the coil winding portion 38 has a left side of the radial portion 40. Since the left side portion serving as the side wall of the coil has a height equal to or greater than the wire diameter of the coil 30, the winding start portion 30 a can be maintained in the radial portion 40 so as to face the force. Further, since the locking piece 43 locks the bent portion of the winding start portion 30a accommodated in the guide groove 39 from above, the winding start portion 30a is guided by the guide groove 39 when the coil 30 is wound. Never leave.

  Subsequently, as shown in FIG. 9, the coil 30 for the second turn is wound following the first turn on the innermost radial direction of the teeth portion 33. As shown in the drawing, the second winding coil 30 is wound along the coil winding portion 38 so as to pass above the winding start portion 30 a accommodated in the radial portion 40 of the guide groove 39. First, winding is performed so as to be adjacent to the radially outer side of the first turn. Thus, by winding the coil 30 so as to cover the winding start portion 30a accommodated in the radial direction portion 40 of the guide groove 39, the crossover wire 32 for connecting the plurality of divided cores 31 together is formed. The coil winding start portion 30 a is fixed by the coil 30 wound around the coil winding portion 38.

  Thereafter, as shown in FIG. 10, in the same manner as the coil 30 of the second turn, the winding coil 30 of each turn forming the first layer is accommodated in the radial portion 40 of the guide groove 39. The coil is wound sequentially along the coil winding portion 38 to the radially outer side of the teeth portion 33 so as to pass through the upper side of the teeth. Thereby, the winding start part 30a accommodated in the radial direction part 40 of the guide groove 39 is substantially covered and fixed reliably by the coil 30 of the first layer.

  Next, as shown in FIG. 11, the second layer coil 30 is wound from the radially outer side to the radially inner side so as to cover the outer side of the first layer coil 30 so as to fit in the slot space X. Turn. Since the radially outer slot space X is wider than the radially inner side, after winding the final turn of the first layer on the most radially outer side of the teeth portion 33, the slot space X is placed immediately above the slot space X so as to fit in the slot space X. The coil 30 of the second layer can be wound from the position. Therefore, the slot space X can be used effectively, and the space factor of the coil 30 can be increased. Thereafter, the coils 30 of each turn forming the second layer are sequentially wound from the radially outer side to the radially inner side of the teeth portion 33 so as to go around the outer side of the first layer coil 30.

  Finally, as shown in FIG. 12, the winding end portion 30 b of the coil 30 is bound and fixed so as to be accommodated in the recess 45 of the binding portion 44. Thereby, both the winding start part 30a and the winding end part 30b of the coil 30 used as the connecting wire 32 are fixed. Therefore, when the plurality of split cores 4 shown in FIG. 2 are combined to form the outer stator 3 as shown in FIG. 1, since the crossover wires 32 are fixed by the insulator 36, it is easy to wind and workability is good. Further, since the winding start portion 30a and the winding end portion 30b of the coil 30 are fixed and become a fixed position, it is easy to automate the operation using an industrial robot or the like. In particular, even when the wire diameter of the coil 30 is large and the teeth portion 33 where the coil 30 starts to be wound is a single layer coil, the winding start portion 30a is fixed by the insulator 36, and the workability is significantly improved. It is. In addition, the motor 1 using such an outer stator 3 can be assembled easily, and the coil space factor is high, so that the motor performance is improved.

  In the present embodiment, a brushless motor having a three-phase coil has been described as an example. However, the present invention is not limited to the configuration of the motor 1 described in the embodiment. Further, in the present embodiment, the divided core 31 obtained by dividing the outer stator 3 in units of teeth is connected in an annular shape, but the present invention is a stator by the divided core 31 described in the embodiment. For example, the divided cores 31 are connected in series with a moderate degree of freedom, and the coil 30 is continuously wound around the integral divided cores. The outer stator 3 is not divided in units of teeth, and is a linear shape integrated with a thin connecting portion. After the coil 30 is continuously wound, the outer stator 3 is bent at the thin connecting portion. In this way, other configurations such as an annular outer stator can be adopted.

FIG. 1 is a diagram showing a schematic configuration of a motor 1 according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of the divided core group 4. FIG. 3 is a schematic perspective view showing the configuration of the split core 31. FIG. 4 is a perspective view showing a modification of the insulator 36. FIG. 5 is a perspective view showing the configuration of the insulator 36. FIG. 6 is a plan view showing the configuration of the insulator 36. FIG. 7 is a cross-sectional view showing an AA cross section of the insulator 36. FIG. 8 is a plan view for explaining a method of winding a coil around the split core 31 to which the insulator 36 is attached. FIG. 9 is a plan view for explaining a method of winding a coil around the split core 31 to which the insulator 36 is attached. FIG. 10 is a plan view for explaining a coil winding method around the split core 31 to which the insulator 36 is attached. FIG. 11 is a plan view for explaining a coil winding method around the split core 31 to which the insulator 36 is attached. FIG. 12 is a plan view for explaining a coil winding method around the split core 31 to which the insulator 36 is attached. FIG. 13 is a cross-sectional view showing a conventional split core 90. FIG. 14 is a view showing a state where the coil 94 is wound from the radially outer side of the tooth portion 92. FIG. 15 is a diagram illustrating a state in which the coil 94 is wound from the radially inner side of the tooth portion 92.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Inner rotor 3 ... Outer stator 30 ... Coil 30a ... Winding start part 30b ... Winding end part 31 ... Divided core (stator core)
33 ... Teeth part 36 ... Insulator 38 ... Coil winding part 39 ... Guide groove 40 ... Radial part 41 ... Circumferential part 43 ... Locking piece 44 ... Tying part

Claims (9)

An insulator that is attached to at least a rotor axial direction end portion of a stator core of a stator core in which a plurality of tooth portions protrude radially inward,
A coil winding portion bulging outward from the end portion in the axial direction of the rotor, and a concave portion provided in the coil winding portion, so that the winding start portion of the coil is guided from the radially outer side to the radially inner side. An insulator having a guide groove.   The guide groove has a radial direction formed from the radial outer side to the radial inner side along the radial direction, and a circumferential direction formed from the inner end of the radial direction part to any one side of the teeth part. The insulator according to claim 1, comprising: a portion.   The guide groove includes an engaging piece that protrudes from an upper end near the inner end of the radial portion and from which the circumferential portion is formed, and engages a coil accommodated in the guide groove. Item 2. The insulator according to item 2.   4. The insulator according to claim 2, wherein the coil winding portion is formed by notching an upper end portion on a side wall side of the radial direction portion of the guide groove and on which the circumferential direction portion is not formed. 5.   The insulator according to any one of claims 1 to 4, wherein a binding portion for binding a winding end portion of the coil is formed on a radially outer side.   The insulator according to any one of claims 1 to 5, wherein the stator core includes a divided core divided for each tooth portion.   The insulator according to any one of claims 1 to 6 is mounted on a tooth portion of a stator core, and a winding start portion of a coil is accommodated in the guide groove and guided from a radially outer side to a radially inner side, A stator in which a coil is wound around the coil winding portion so as to go around.   The stator according to claim 7, wherein the winding start portion of the coil is a single layer coil. A motor comprising the stator according to claim 7.

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