JP2009038869A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor which properly protect a permanent magnet. <P>SOLUTION: An intermagnet spacer 11 is provided between permanent magnets 4 installed in the moving member 5 of a planar linear motor 1, the height direction hs of the intermagnet spacer 11 is set larger than the height dimension hm of the permanent magnet 4, and a magnet protective cover 15 is so placed on the intermagnet spacer 11 as to cover the permanent magnet 4. Since the intermagnet spacer 11 is provided between the permanent magnets 4, it can prevent the breakage due to the contact between the fellow permanent magnets 4. Since the magnet protective cover 15 is installed on the intermagnet space 11, it becomes in such a state that the section, on the armature 2 side, of the permanent magnet 4 is sealed, so it can prevent the adhesion of the dust or foreign matter to the permanent magnet 4. Since the magnet protective cover 15 is provided on the intermagnet spacer 11 whose height dimension hs is set larger than the height dimension hm of the permanent magnet 4, even if external force acts on the magnet protective cover 15, the external force does not act directly on the permanent magnet 4. It properly prevents, therefore, the breakage of the permanent magnet 4 by external force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear motor used in various industrial fields such as machine tools, automobiles, and conveyance devices.

  A conventional linear motor has a stator and a mover that is arranged so as to be linearly movable with respect to the stator, and a plurality of yokes provided in the mover along the moving direction of the mover. A permanent magnet is provided, and the stator is provided with an armature including a plurality of winding portions arranged along the moving direction of the mover, and cooperates with the permanent magnet by energizing the winding portion. In addition, there is a linear motor that generates thrust for the mover to linearly move the mover. In this linear motor, a positioning groove is carved in the yoke portion, a permanent magnet is disposed in the positioning groove, and the permanent magnet is positioned and fixed using an adhesive.

Moreover, there exists a thing shown by patent document 1 as another conventional linear motor. The linear motor disclosed in Patent Document 1 includes a field portion having two opposing yokes and a plurality of permanent magnets disposed on the opposing surfaces of the two yokes, and a permanent disposed on each of the two yokes. A permanent magnet fixing guide comprising an armature winding portion disposed in a magnetic gap between magnets and having grooves of equal pitch is bonded and fixed to each of the two yokes, and a plurality of permanent magnets Is inserted into the groove of the permanent magnet fixing guide, positioned, and fixed by adhesion.
Further, Patent Document 2 includes a stator having a cylindrical fixed yoke and a substantially cylindrical magnet member that is substantially cylindrical and is mounted on the outside of the fixed yoke, so as to be outside the magnet member. A linear motor with a guide pipe is shown.
JP 2001-95224 A JP 2003-324934 A

  By the way, in the above-described conventional technique in which the permanent magnet is positioned and fixed in the positioning groove formed in the yoke portion, the processing of the groove for positioning the magnet on the yoke member is expensive and requires time for manufacture. Therefore, improvement is desired.

In addition, in this linear motor including this prior art, when some external force is applied by the attractive force of the permanent magnet, or when the magnetic piece is attached, the external force is applied directly to the permanent magnet, or the magnetic piece is There is a problem that the permanent magnet is chipped or cracked due to the adhesion. In general, the damage of the permanent magnet greatly reduces the performance of the motor, which is not preferable from the viewpoint of reliability.
It can be considered that the linear motor disclosed in Patent Document 1 is provided with a magnet cover on the permanent magnet fixing guide so as to cover the permanent magnet. However, in this case, since the magnet cover and the permanent magnet are in close contact with each other, an external force may act on the permanent magnet through the magnet cover to cause generation of magnet cracks.
In the linear motor shown in Patent Document 2, the guide pipe is thin, and is provided on the outside of the magnet member in proximity to the guide member. For this reason, the external force may act on the permanent magnet via the guide pipe and cause the occurrence of magnet cracking.

  This invention is made | formed in view of the said situation, and it aims at providing the linear motor which can protect a permanent magnet appropriately.

The invention according to claim 1 is a linear motor having a stator and a mover that is linearly movable relative to the stator, and one of the stator and the mover includes the mover. A plurality of permanent magnets are provided along the moving direction of the child, and on the other side, an armature including a plurality of winding parts arranged along the moving direction of the mover is provided. In a linear motor that linearly moves the mover by generating a thrust force on the mover in cooperation with the permanent magnet by energizing the motor, between the adjacent permanent magnets in one of the stator and the mover An inter-magnet spacer made of a non-magnetic material is provided, and an end of the inter-magnet spacer on the armature side is closer to the armature than an end of the permanent magnet on the armature side. It is characterized by being set The features.
According to a second aspect of the present invention, in the linear motor according to the first aspect, a magnet protective cover is provided at an end of the inter-magnet spacer on the armature side so as to cover the armature side portion of the permanent magnet. Is provided.

According to a third aspect of the present invention, in the linear motor according to the second aspect, the armature is provided with a sliding member that slides on a surface of the magnet protective cover, and the armature of the sliding member is provided. The dimension along the moving direction is longer than the dimension along the moving direction of the mover in the permanent magnet.
According to a fourth aspect of the present invention, in the linear motor according to any one of the first to third aspects, the mover and the stator are such that the stator is outside the mover, and an outer peripheral surface of the mover is It is circular, and the inner peripheral surface of the stator is circular.
The invention according to claim 5 is the linear motor according to any one of claims 1 to 3, wherein the mover and the stator are such that the mover is outside the stator and the outer peripheral surface of the stator is It is circular, and the inner peripheral surface of the mover is circular.

According to invention of Claim 1, 3-5, since the inter-magnet spacer which consists of nonmagnetic materials is provided between the adjacent permanent magnets in one among a stator and a needle | mover, between permanent magnets. Damage due to contact can be prevented.
According to invention of Claim 2, 3-5, the edge part by the side of the armature of the spacer between magnets is set so that it may become a position near an armature compared with the edge part by the side of the armature of a permanent magnet. Since the magnet protective cover is provided at the armature side end of the inter-magnet spacer so as to cover the armature side portion of the permanent magnet, even if an external force acts on the magnet protective cover. The external force does not act directly on the permanent magnet. For this reason, damage to the permanent magnet due to external force can be prevented appropriately.

A first embodiment of the present invention will be described below with reference to FIGS.
1 and 2, a flat plate type three-phase linear synchronous motor (hereinafter referred to as a flat plate linear motor 1) 1 includes a stator 3 having an armature 2 and a linear shape with respect to the stator 3 (see FIG. 1). And a mover 5 that is disposed so as to be relatively movable (in the left-right direction) and that includes a permanent magnet 4. The mover 5 includes a substantially plate-like yoke member 6 extending in the left-right direction in FIG. 1, and a plurality (six in this embodiment) of permanent magnets 4 attached to the surface of the yoke member 6 (upper side in FIG. 1). It is equipped with. The yoke member 6 includes a plate-shaped yoke member main body portion 7 and a wall portion 8 suspended from one end portion of the yoke member main body portion 7. A stopper 9 is provided at the other end portion of the yoke member main body portion 7. It is attached by bolts 10.

  Affixing the permanent magnet 4 to the yoke member 6 and fixing the inter-magnet spacer 11 described later to the yoke member 6 are performed using an epoxy resin adhesive, a structural adhesive having excellent adhesive strength, or the like. Since the permanent magnet 4 is generally thermally demagnetized, an adhesive that is cured at room temperature or thermally cured at about 70 ° C. is used to attach the permanent magnet 4 to the yoke member 6. Moreover, you may make it fix to the spacer 11 between magnets and the permanent magnet 4 using an adhesive agent.

  The six permanent magnets 4 are arranged with a gap 12 along the moving direction of the mover 5 (the left-right direction in FIG. 1). The permanent magnet 4 has a height dimension of hm and a length dimension in the left-right direction in FIG. 2 of n. The permanent magnet 4 is made of a rare earth or ferrite material. The permanent magnet 4 may be skewed to improve cogging specific to the linear motor.

  A plate-shaped inter-magnet spacer 11 made of a nonmagnetic material is inserted into the gap 12 so as to be in close contact with the permanent magnet 4 and is fixed to the yoke member 6. The height dimension hs of the inter-magnet spacer 11 is set to be larger than the height dimension hm of the permanent magnet 4 (hs> hm), whereby the end of the inter-magnet spacer 11 on the armature 2 side (upper side in FIG. 1). The part is set to be closer to the armature 2 than the end of the permanent magnet 4 on the armature 2 side (upper side in FIG. 1). The permanent magnet 4 can be accurately arranged by the inter-magnet spacer 11.

A magnet protective cover 15 extending from the wall 8 to the stopper 9 is placed on the armature 2 side end of the inter-magnet spacer 11 so as to cover the armature 2 side portion of the permanent magnet 4. . At this time, since the height dimension hs of the inter-magnet spacer 11 is set to be larger than the height dimension hm of the permanent magnet 4 (hs> hm), the magnet protection cover 15 has a space between it and the permanent magnet 4. And is not in contact with the permanent magnet 4.
The magnet protective cover 15 is fixed to the inter-magnet spacer 11 using an epoxy resin adhesive, a structural adhesive having excellent adhesive strength, or the like.
In the present embodiment, for fixing the inter-magnet spacer 11 and the magnet protective cover 15, an adhesive equivalent to the adhesive used for fixing the permanent magnet 4 and the inter-magnet spacer 11 to the yoke member 6 is used. ing.

  The plurality of permanent magnets 4, the inter-magnet spacers 11, and the magnet protection cover 15 are sandwiched and held between the wall portion 8 and the stopper 9. Since the magnet protective cover 15 is disposed as described above, the armature 2 side portion of the permanent magnet 4 is sealed.

The armature 2 of the stator 3 includes a core 16 made by cutting or the like from a powder magnetic core, laminated electromagnetic steel plates, magnetic pieces, and an arbitrary direction (in this embodiment, a winding center) The axis is oriented in the vertical direction in FIG. 1) and is composed of U-phase, V-phase, and W-phase coils 17U, 17V, and 17W.
A flange 18 is fixed to both ends of the core 16 by bolts 19. The flange 18 is provided with a plate-like sliding member 20 that slides on the magnet protection cover 15. The sliding member 20 is set such that the length dimension L in the left-right direction in FIG. 2 is larger than the length dimension n of the permanent magnet 4 (L> n).

In the flat-plate linear motor 1 configured as described above, the inter-magnet spacer 11 is provided between the adjacent permanent magnets 4, so that damage due to contact between the permanent magnets 4 can be prevented. Moreover, since the magnet protective cover 15 is placed on the inter-magnet spacer 11 so as to cover the permanent magnet 4 as described above, the armature 2 side portion of the permanent magnet 4 is sealed and becomes permanent. The adhesion of dust and foreign matter to the magnet 4 can be prevented.
Further, the height dimension hs of the inter-magnet spacer 11 is set larger than the height dimension hm of the permanent magnet 4 (hs> hm), and the magnet protection cover 15 is provided so as to be placed on the inter-magnet spacer 11. Even if an external force acts on the magnet protection cover 15, the external force does not act directly on the permanent magnet 4. For this reason, damage of the permanent magnet 4 by external force can be prevented appropriately.

  The sliding member 20 is provided on both ends of the core 16, and the length dimension L of the sliding member 20 is set to a value larger than the length dimension n of the permanent magnet 4 (L> n). For this reason, the external force applied to the permanent magnet 4 is prevented by receiving the load of the sliding member 20 by at least one or more inter-magnet spacers 11 at any position in the moving direction.

In the first embodiment, the mover 5 of the first embodiment is used in a fixed manner, and thus the mover 5 is used as a stator, while the stator 3 of the first embodiment is movable. As a result, you may comprise so that the said stator 3 may be used as a needle | mover.
In the first embodiment, the case where the movable element 5 is provided with the permanent magnet 4 and the stator 3 is provided with the armature 2 is exemplified. However, instead of this, the armature 2 is provided on the movable element 5. The permanent magnet 4 may be provided on the stator 3. Also in this case, the mover 5 of the first embodiment may be fixed (used as a stator), while the stator 3 may be moved with respect to the mover 5 thus fixed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 1 and 2 based on FIG.
The linear motor according to the second embodiment is a cylindrical linear synchronous motor (referred to as a cylindrical linear motor).
In FIG. 3, a cylindrical linear synchronous motor (referred to as a cylindrical linear motor) 1A is inserted into a substantially cylindrical stator (hereinafter referred to as a cylindrical stator 3A) and a cylindrical stator 3A. A substantially axial movable element (hereinafter, referred to as an axial movable element 5A) that is movable relative to the cylindrical stator 3A in the left-right direction in FIG. 3 is provided. The cylindrical stator 3A is provided with an armature 2A, and the axial movable element 5A is provided with an annular permanent magnet (hereinafter referred to as an annular permanent magnet 4A).

  The shaft-shaped movable element 5A includes a substantially shaft-shaped yoke member (hereinafter referred to as a shaft-shaped yoke member 6A) extending in the left-right direction in FIG. 3 and a plurality of the shaft-shaped movable members inserted into the shaft-shaped yoke member 6A and pasted (this embodiment). 6) of the annular permanent magnets 4A. The shaft-shaped yoke member 6A includes a shaft-shaped yoke member main body portion (hereinafter referred to as a shaft-shaped yoke member main body portion 7A) and a flange portion (hereinafter referred to as a shaft portion) that is suspended from one end of the shaft-shaped yoke member main body portion 7A. An annular stopper (hereinafter referred to as an annular stopper 9A) is inserted into the other end portion of the shaft-shaped yoke member main body portion 7A and is fixed by a bolt 10. .

Attaching the annular permanent magnet 4A to the shaft-like yoke member 6A and fixing the spacer 11A between the annular magnets, which will be described later, to the shaft-like yoke member 6A are performed using an epoxy resin adhesive and adhesive strength as in the first embodiment. It is carried out using a structural adhesive that is excellent in. For attaching the annular permanent magnet 4A to the shaft-like yoke member 6A, an adhesive that is cured at room temperature or thermally cured at about 70 ° C. is used as in the first embodiment.
The six annular permanent magnets 4A are arranged with a gap 12A along the moving direction of the shaft-like movable element 5A (the left-right direction in FIG. 3). The annular permanent magnet 4A has a radial length (length from the inner diameter portion to the outer diameter portion) of hmk and a thickness (length in the left-right direction in FIG. 3) dimension of nk. The annular permanent magnet 4A is made of a rare earth or ferrite material. The annular permanent magnet 4A may be skewed to improve cogging unique to the linear motor.

A plurality of (in this embodiment, five) annular inter-magnet spacers (hereinafter referred to as inter-annular magnet spacers 11A) made of a non-magnetic material are inserted into the shaft-shaped yoke member 6A, and are inserted into the annular permanent magnet 4A. It arrange | positions in the said clearance gap 12A so that it may contact | adhere, and is hold | maintained at the shaft-shaped yoke member 6A etc. so that it may mention later.
The length (the length from the inner diameter portion to the outer diameter portion) dimension hsk of the spacer 11A between the annular magnets is set larger than the length hmk in the radial direction of the annular permanent magnet 4A (hsk> hmk). Thereby, the armature 2A end of the annular magnet spacer 11A is set to be closer to the armature 2A than the armature 2A end of the annular permanent magnet 4A. The annular permanent magnet 4A can be arranged with high accuracy by the inter-annular magnet spacer 11A.

A cylindrical magnet protective cover (hereinafter referred to as a tube) extending from the shaft-shaped yoke member flange portion 8A to the annular stopper 9A is disposed on the armature 2A end of the annular magnet spacer 11A (the outer peripheral surface of the annular magnet spacer 11A). A magnet-like protective cover 15A) is inserted so as to cover the armature 2A side portion of the annular permanent magnet 4A. At this time, since the length dimension hsk in the radial direction of the spacer 11A between the annular magnets is set larger than the length dimension hmk in the radial direction of the annular permanent magnet 4A (hsk> hmk), the cylindrical magnet protective cover 15A is set. Forms an annular space between the annular permanent magnet 4A and is in a non-contact state with the annular permanent magnet 4A. The cylindrical magnet protective cover 15A is fixed to the annular magnet spacer 11A using an epoxy resin adhesive, a structural adhesive having excellent adhesive strength, or the like.
In the present embodiment, the annular magnet spacer 11A and the cylindrical magnet protective cover 15A are fixed in the same manner as the adhesive used for fixing the annular permanent magnet 4A and the annular magnet spacer 11A to the axial yoke member 6A. The adhesive is used.

  The plurality of annular permanent magnets 4A, the inter-annular magnet spacers 11A, and the cylindrical magnet protective cover 15A are sandwiched and held by the shaft-like yoke member flange portion 8A and the annular stopper 9A. Since the cylindrical magnet protective cover 15A is arranged as described above, the armature 2A side portion of the annular permanent magnet 4A is in a sealed state.

The armature 2A of the cylindrical stator 3A has a cylindrical core (hereinafter, referred to as a cylindrical core 16A) made by a cutting process or the like from a powder magnetic core, laminated electromagnetic steel plates, magnetic pieces, and the like. The U-phase, V-phase, and W-phase coils 17U, 17V, and 17W are held on the inner peripheral surface of the core 16A. In this embodiment, the shaft-like movable element 5A is inserted inside the U-phase, V-phase, and W-phase coils 17U, 17V, and 17W. Two sets of U-phase, V-phase, and W-phase coils 17U, 17V, and 17W are provided.
A cylindrical flange (hereinafter, referred to as a cylindrical flange 18A) is fixed to both ends of the cylindrical core 16A by bolts 19. A bearing member 20A (sliding member) is provided in the cylindrical flange 18A, and slides on the cylindrical magnet protective cover 15A to support and guide the shaft-shaped movable element 5A. The bearing member 20A has a length (the length in the left-right direction in FIG. 3; the length along the moving direction of the shaft-like movable element 5A) that is larger than the thickness dimension nk of the annular permanent magnet 4A (Lk> nk). ) Is set.

In the cylindrical linear motor 1A configured as described above, since the inter-annular magnet spacer 11A is provided between the adjacent annular permanent magnets 4A, damage due to contact between the annular permanent magnets 4A can be prevented. Further, since the cylindrical magnet protective cover 15A is inserted through the annular magnet spacer 11A and covers the annular permanent magnet 4A, the armature 2A side portion of the annular permanent magnet 4A is sealed, and the annular permanent magnet It is possible to prevent dust and foreign matter from adhering to 4A.
Further, the radial length dimension hsk of the inter-annular magnet spacer 11A is set larger than the radial length dimension hmk of the annular permanent magnet 4A (hsk> hmk), and the cylindrical inter-magnet spacer 11A is accommodated inside. Since the cylindrical magnet protective cover 15A is provided, even if an external force is applied to the cylindrical magnet protective cover 15A, the external force is transmitted to the inter-annular magnet spacer 11A via the cylindrical magnet protective cover 15A. Does not work on 4A. For this reason, damage to the annular permanent magnet 4A due to external force can be prevented appropriately.

  Bearing members 20A are provided on both ends of the cylindrical core 16A, and the length dimension Lk of the bearing member 20A is set to a value larger than the thickness dimension nk of the annular permanent magnet 4A (Lk> nk). For this reason, at any position in the moving direction of the shaft-shaped movable element 5A, the load of the bearing member 20A is received by the at least one or more annular inter-magnet spacers 11A, thereby preventing an external force applied to the annular permanent magnet 4A. Yes.

  In the second embodiment, the case where the annular permanent magnet 4A is used as a permanent magnet is taken as an example. Instead, a plurality of tile-shaped or flat permanent magnet pieces are annularly connected via a connecting member. You may use the permanent magnet small piece connection annular body formed in the cyclic | annular form substantially equivalent to 4 A of permanent magnets.

In the second embodiment, the shaft-like movable element 5A of the second embodiment is used in a fixed manner. As a result, the shaft-like movable element 5A is used as a stator (shaft-like stator), while the second embodiment is used. The cylindrical stator 3A may be movable, and thus the cylindrical stator 3A may be used as a movable element (cylindrical movable element).
In the second embodiment, the case where the annular permanent magnet 4A is provided on the axial movable element 5A and the armature 2A is provided on the cylindrical stator 3A is taken as an example. The armature 2A may be provided in the child 5A, and the annular permanent magnet 4A may be provided in the cylindrical stator 3A. Even in this case, the shaft-like movable element 5A of the second embodiment is fixed (used as a stator), while the cylindrical stator 3A is moved with respect to the fixed shaft-like movable element 5A. May be.

Next, a linear motor according to a third embodiment of the present invention will be described based on FIGS. 4 and 5 with reference to the first embodiment (FIGS. 1 and 2). The linear motor according to the third embodiment (hereinafter referred to as the second flat plate type linear motor 1B for convenience) includes substantially the same components as those of the first embodiment.
In 1st Embodiment, when the length of the moving direction of the needle | mover 5 in the permanent magnet 4 (henceforth the length of the permanent magnet 4) is long, the longitudinal direction of the needle | mover 5 of the sliding member 20 attached to a linear motor As a result, the total length of the linear motor becomes longer. The second flat plate type linear motor 1B according to the third embodiment is an improvement of the above-described problem of the first embodiment.

  By the way, the flat plate linear motor 1 of the first embodiment can assume in advance an external force applied to the magnet protection cover 15 depending on the application, whereby the maximum deflection amount of the magnet protection cover 15 can be obtained. In the second flat plate type linear motor 1B of the third embodiment having substantially the same components as the first embodiment, the inter-magnet spacer 11 is used as described later, using the maximum deflection amount of the magnet protective cover 15 described above. And the dimension of the permanent magnet 4 is set, and the length (length in the left-right direction in FIG. 4) of the sliding member 20 and the second flat-plate linear motor 1B is suppressed by this dimension setting.

  That is, in the third embodiment (FIGS. 4 and 5), assuming the external force applied to the magnet protection cover 15 in advance, the maximum deflection amount εmax with respect to the load of the magnet protection cover 15 is calculated, and the safety factor is given to the maximum load. The height dimension hs of the inter-magnet spacer 11 and the height dimension hm of the permanent magnet 4 are determined so as to satisfy hm <(hs−εmax) in accordance with the amount of deflection that has been multiplied. By setting the dimensions in this way, the length dimension L of the sliding member 20 is made shorter than the length n of the permanent magnet 4 (L <n), so that the movable plate 5 of the second flat plate type linear motor 1B is moved. The length along the moving direction (the length in the left-right direction in FIG. 4) is shortened to reduce the size. Further, as the sliding member 20 is shortened, the cost reduction effect can be achieved, and a precise micro motor can be manufactured, and a practical linear motor can be constructed.

  In the third embodiment, the linear motor is a flat type linear motor and the sliding member 20 is used as the sliding member. However, instead, the linear motor is a cylindrical linear motor, and the sliding When the member is a bearing member (see FIG. 3), the length of the bearing member is made permanent by adjusting the size of the inter-magnet spacer and the permanent magnet in the same manner as in the third embodiment in consideration of the maximum deflection amount. The length of the magnet may be shorter than the length of the magnet, thereby reducing the length of the cylindrical linear motor.

  As the inter-magnet spacer, the plate-shaped inter-magnet spacer 11 is used in the first and third embodiments and the annular inter-magnet spacer 11A is used as an example in the second embodiment. Instead, the inter-magnet spacers 31A and 31B shown in FIG. 6 may be used, and the annular inter-magnet spacers 32A, 32B, 32C, and 32D shown in FIG. 7 may be used instead of the annular inter-magnet spacer 11A.

The intermagnet spacer 31A shown in FIGS. 6 (a1) and (a2) has a plate shape, and two surface portions in contact with the permanent magnet 4 (FIGS. 1 and 4) [FIG. 6 (a1) left and right surface portions, FIG. a2) A plurality of holes 35 (four in FIG. 6 (a2)) are provided along the longitudinal direction. ] Is forming. According to the intermagnet spacer 31A, the weight can be reduced by the amount of the hole 35 formed.
By the way, the inter-magnet spacer 31A is fixed to the yoke member main body 7 of the yoke member 6 with an adhesive, but the width dimension of the inter-magnet spacer 31A [FIG. 6 (a1) left and right direction (corresponding to the left and right direction in FIG. 1). ) Length dimension. ] May be insufficient in length to obtain a desired fixing force. In this case, the inter-magnet spacer 31 </ b> A may be further fixed to the permanent magnet 4 with an adhesive for reinforcement or the like. In the inter-magnet spacer 31A shown in FIGS. 6 (a1) and 6 (a2), the holes 35 are used for escape of the adhesive used for fixing the inter-magnet spacer 31A and the permanent magnet 4 (adhesive pool). be able to.
In the example shown in FIGS. 6A1 and 6A2, the hole 35 is formed, but a concave portion may be formed on the two surface portions that are in contact with the permanent magnet 4 instead.

The spacer 31B between magnets shown in FIGS. 6 (b1) and 6 (b2) has a plate shape, and two surface portions in contact with the permanent magnet 4 (FIG. 1, FIG. 4) [FIG. 6 (b1) left and right surface portions. 6 (b2) on the front side and the other side of the paper surface], a recess 36 is formed extending in the longitudinal direction of the inter-magnet spacer 31B (FIG. 6 (b2) left and right direction) and having a substantially V shape in side view. Yes.
According to the inter-magnet spacer 31B, when the permanent magnet 4 is fixed using an adhesive, the bonding area can be increased by the formation of the recess 36, and the fixing strength can be increased accordingly.
In the example shown in FIGS. 6 (b1) and (b2), a substantially V-shaped recess 36 is formed, but instead of this, two permanent magnets 4 (FIGS. 1 and 4) in the inter-magnet spacer are in contact with each other. You may form many recessed parts in the surface part over the whole surface or in part.

The spacers 32A between the annular magnets shown in FIGS. 7 (a1) and (a2) have two surface portions in contact with the annular permanent magnet 4A (see FIG. 3) [FIG. 7 (a1) front surface side and other surface portions on the far side. A plurality of holes 37 are opened in the circumferential direction (eight in the example shown in FIGS. 7A1 and 7A2). ] Is forming. According to the annular magnet spacer 32A, the weight can be reduced by the amount of the holes 37 formed.
Moreover, the spacer 32A between ring magnets may be fixed to the ring permanent magnet 4A (refer FIG. 3), for example using an adhesive agent. The hole 37 of the annular magnet spacer 32A is used for escape of the fixing adhesive (adhesive pool).
In the example shown in FIGS. 7A1 and 7A2, the hole 37 is formed, but a plurality of recesses may be formed in two surface portions in contact with the permanent magnet 4 instead.

The spacers 32B between the annular magnets shown in FIGS. 7 (b1) and 7 (b2) have two surface portions in contact with the annular permanent magnet 4A (see FIG. 3) [FIG. 7 (b1) a front surface side and a surface portion on the far side. In FIG. 7 (b2), the left and right surface portions] are formed with an annular recess 38 that extends in the longitudinal direction of the annular inter-magnet spacer 32B (FIG. 7 (b2) left and right direction) and is substantially V-shaped in side view. .
According to the inter-annular magnet spacer 32B, when the annular permanent magnet 4A (see FIG. 3) is fixed using an adhesive, the bonding area can be increased by the amount of the annular recess 38 formed, and the fixing strength is increased accordingly. Can be big.
In the example shown in FIGS. 7B1 and 7B2, an annular recess 38 having a substantially V shape is formed. Instead, the annular permanent magnet 4A (see FIG. 3) in the spacer between the annular magnets is contacted. A large number of recesses may be formed over the entire surface or part of the two surface portions.

The spacers 32C between the annular magnets shown in FIGS. 7 (c1) and 7 (c2) are composed of two spacer structures (hereinafter, for convenience, first and second spacer structures) 40 and 41 that form an annular shape. In other words, it can be said to be a division type. This inter-annular spacer 32C is used by being assembled so that the first and second spacer constituting bodies 40, 41 are annular.
For example, the annular inter-magnet spacer 32C is formed by attaching the first spacer constituting body 40 to the shaft-like yoke member main body 7A (see FIG. 3) of the shaft-like yoke member 6A and then attaching the second spacer constituting body 41 to the coaxial yoke member. By attaching to the main body portion 7A, the shaft-shaped yoke member main body portion 7A can be assembled. If the spacer between the annular magnets is not a split type, the assembly to the shaft-like yoke member main body portion 7A needs to be inserted into the shaft-like yoke member main body portion 7A, which is inconvenient. In contrast, the split type inter-magnet spacer 32C can be assembled without being inserted into the shaft-like yoke member main body 7A, so that the assembling property can be improved.

The spacers 32C between the annular magnets shown in FIGS. 7 (c1) and (c2) are of a two-divided type, but instead of this, a multi-divided type of three or more may be used.
It should be noted that the annular magnet spacer 32A shown in FIGS. 7A1 and 7A2, the annular magnet spacer 32B shown in FIGS. 7B1 and 7B2, and FIGS. 7D1 and 7D described later. It is good also as a division | segmentation type about the spacer 32D between annular magnets shown.

A plurality of annular intermagnet spacers 32D shown in FIGS. 7 (d1) and 7 (d2) are provided on the outer circumferential surface in the circumferential direction [FIG. 7 (d1) shows four cases. ] Groove 43 is formed. The groove 43 has two surface portions in contact with the annular permanent magnet 4A (see FIG. 3) [FIG. 7 (d1) the front surface side and the other surface portion on the opposite side. 7 (d2) left and right surface portions].
The inter-annular magnet spacer 32D is used in place of, for example, the inter-annular magnet spacer 11A of FIG. 3, but an axial key is inserted into the groove 43, and this key is used as a guide when assembling the annular permanent magnet 4A. be able to. By using the grooves 43 in this way, the annular permanent magnet 4A can be easily assembled.
When a temperature sensor, a position sensor, or the like is disposed between the cylindrical magnet protective cover 15A (see FIG. 3) and the annular magnet spacer 11A, lead wires for the temperature sensor, the position sensor, etc. are wired through the groove 43. be able to.

It is sectional drawing which shows typically the flat type linear motor which concerns on 1st Embodiment of this invention. It is the elements on larger scale of FIG. It is sectional drawing which shows typically the cylindrical linear motor which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows typically the linear motor which concerns on 3rd Embodiment of this invention. It is the elements on larger scale of FIG. 1A and 1B show another type of inter-magnet spacers in place of the inter-magnet spacers of the first and third embodiments, (a1) is a side view showing an inter-magnet spacer in which holes are formed, and (a2) is a front view of the inter-magnet spacer. (B1) is a side view showing a spacer between magnets provided with a recess, and (b2) is a front view of the spacer between magnets. The other type of spacer between annular magnets which replaces the spacer between annular magnets of 2nd Embodiment is shown, (a1) is a front view which shows the spacer between annular magnets in which the hole was formed, (a2) is A- of (a1). A sectional view taken along line A, (b1) is a front view showing a spacer between annular magnets having a recess, (b2) is a sectional view taken along line AA in (b1), and (c1) is a split-type annular magnet. (C2) is a cross-sectional view taken along line AA in (c1), (d1) is a front view showing a spacer between annular magnets having grooves, and (d2) is an A in (d1). It is sectional drawing which follows the -A line.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Flat type linear motor, 1A ... Cylindrical linear motor, 2 ... Armature, 2A ... Armature, 3 ... Stator, 3A ... Cylindrical stator, 4 ... Permanent magnet, 4A ... Permanent magnet, 5 ... Movable child DESCRIPTION OF SYMBOLS 5A ... Cylindrical needle | mover, 6 ... Yoke member, 6A ... Shaft-shaped yoke member, 11 ... Spacer between magnets, 11A ... Spacer between annular magnets, 15 ... Magnet protection cover, 15A ... Cylindrical magnet protection cover, 20 ... Sliding Moving member, 20A ... Bearing member (sliding member).

Claims (5)

A linear motor having a stator and a mover that is linearly movable relative to the stator, and one of the stator and the mover includes a plurality of ones along a moving direction of the mover. The other side is provided with an armature including a plurality of winding portions arranged along the moving direction of the mover, and cooperates with the permanent magnet by energizing the winding portion. In a linear motor that operates to generate a thrust force on the mover to linearly move the mover,
An inter-magnet spacer made of a non-magnetic material is provided between adjacent permanent magnets in one of the stator and the mover,
The linear motor is characterized in that the armature side end of the inter-magnet spacer is set to be closer to the armature than the armature side end of the permanent magnet. .   2. The linear motor according to claim 1, wherein a magnet protective cover is provided at an end of the armature side of the inter-magnet spacer so as to cover the armature side portion of the permanent magnet. The armature is provided with a sliding member that slides on the surface of the magnet protective cover,
The linear motor according to claim 2, wherein a dimension of the sliding member along the moving direction of the mover is longer than a dimension of the permanent magnet along the moving direction of the mover.   2. The mover and the stator, wherein the stator is outside the mover, the outer peripheral surface of the mover is circular, and the inner peripheral surface of the stator is circular. 4. The linear motor according to any one of 3.   The mover and the stator are characterized in that the mover is outside the stator, the outer peripheral surface of the stator is circular, and the inner peripheral surface of the mover is circular. 4. The linear motor according to any one of 3.

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