Stator and motor

Abstract

To provide a stator and a motor which easily prevent a short circuit between teeth and a coil.SOLUTION: A stator includes a ring core having an annular shape around a shaft center 20, a plurality of teeth 3, a plurality of insulators 4, and a plurality of coils 12. The plurality of teeth 3 are attached to the ring core so as to protrude from the ring core toward the inside of the radial D1 portion of the ring core. The plurality of insulators 4 are fitted to the outer peripheral surface 30 around the radial D1 portion of each of the plurality of teeth 3. The plurality of coils 12 are wound around the outer peripheral surface 30 of each of the plurality of teeth 3 via each of the plurality of insulators 4. Each of the plurality of insulators 4 includes a first resin portion 41, a second resin portion 42, and a snap-fit portion 6. The snap-fit portion 6 includes a hooking convex portion 61 and a hooking concave portion 62 provided on one and the other of the first resin portion 41 and the second resin portion 42.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a stator and a motor, and more particularly to a stator including a ring core, teeth, and an insulator, and a motor including the stator. [Background technology]

[0002] Patent Document 1 discloses a method for attaching a coil to a stator core. In this attachment method, a coil is sandwiched between a pair of cassettes, and the cassettes are attached to the stator core. Specifically, the cassette has a support portion that is inserted into the inner periphery of the coil's spiral structure to support the coil, and a flange portion provided on one side in the axial direction.

[0003] In this case, the support part is inserted into the inner periphery of the coil from the side of one cassette where the flange part is not formed, and the other cassette is placed on top of it, and the two are engaged at the engaging part provided on the support part. Then, this cassette-coil assembly is attached to the stator core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-155294 Summary of the Invention [Problem to be solved by the invention]

[0005] In the mounting method described in Patent Document 1, the pair of cassettes are simply butted together at their engaging portions, leaving a gap between the pair of cassettes, which means that the space where the coil is located and the space where the stator core is located communicate with each other through the gap, making it difficult to prevent a short circuit between the coil and the stator core.

[0006] An object of the present disclosure is to provide a stator and a motor that can easily prevent short circuits between teeth and coils. [Means for solving the problem]

[0007] A stator according to one aspect of the present disclosure includes a ring core that is annular around an axis, a plurality of teeth, a plurality of insulators, and a plurality of coils. The plurality of teeth are attached to the ring core so as to protrude radially inward from the ring core. The plurality of insulators are fitted onto the outer peripheral surface of each of the plurality of teeth in the radial direction. The plurality of coils are wound around the outer peripheral surface of each of the plurality of teeth via each of the plurality of insulators. Each of the plurality of insulators has a first resin portion, a second resin portion, and a snap-fit ​​portion located between the first resin portion and the second resin portion and connecting the first resin portion and the second resin portion. The first resin portion is located on the inner side in the radial direction. The second resin portion is located on the outer side in the radial direction. The snap-fit ​​portion has a hooking protrusion provided on one of the first resin portion and the second resin portion, and a hooking recess provided on the other of the first resin portion and the second resin portion, into which the hooking protrusion hooks.

[0008] A motor according to one aspect of the present disclosure includes the stator and a rotor facing the stator. [Effects of the Invention]

[0009] In the stator and motor of the present disclosure, short circuits between the teeth and the coils can be easily prevented. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a stator according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of a motor having the stator of the same. [Figure 3] FIG. 3 is a cross-sectional view of the stator taken along a cross section perpendicular to the radial direction of the stator. [Figure 4]FIG. 4 is an enlarged view of part A in FIG. [Figure 5] FIG. 5 is a cross-sectional view of the stator taken along a cross section perpendicular to the circumferential direction of the stator. [Figure 6] FIG. 6 is a partially enlarged view of FIG. [Figure 7] FIG. 7 is a perspective view of an insulator for the stator of the same. [Figure 8] FIG. 8 is a front view of a coil unit according to the stator of the same. [Figure 9] FIG. 9 is an exploded perspective view illustrating a method for manufacturing the stator. [Figure 10] FIG. 10 is an exploded perspective view illustrating a method for manufacturing the stator. [Figure 11] FIG. 11 is a perspective view illustrating a method for manufacturing the stator. [Figure 12] FIG. 12 is an enlarged cross-sectional view of a portion of the stator according to the second embodiment. [Figure 13] FIG. 13 is an enlarged cross-sectional view of a portion of the stator according to the third embodiment. [Figure 14] FIG. 14 is an enlarged cross-sectional view of a portion of the stator according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (1) Overview A stator and a motor according to the present disclosure will be described. The embodiments described below are merely a part of various embodiments of the present disclosure, and various modifications can be made depending on the design and the like as long as the object of the present disclosure can be achieved in the following embodiments.

[0012] As shown in FIGS. 1 to 3, a stator 1 according to the present disclosure includes a ring core 2 that is annular around an axis, a plurality of teeth 3, a plurality of insulators 4, and a plurality of coils 12. The plurality of teeth 3 are attached to the ring core 2 so as to protrude inward in a radial direction D1 of the ring core 2. As shown in FIGS. 4 and 5, the plurality of insulators 4 are fitted onto an outer peripheral surface 30 of each of the plurality of teeth 3 in the radial direction D1. The plurality of coils 12 are wound around the outer peripheral surface 30 of each of the plurality of teeth 3 via each of the plurality of insulators 4. Each of the plurality of insulators 4 has a first resin portion 41, a second resin portion 42, and a snap-fit ​​portion 6 that is located between the first resin portion 41 and the second resin portion 42 and connects the first resin portion 41 and the second resin portion 42. The snap-fit ​​portion 6 has a hooking protrusion 61 provided on one of the first resin portion 41 and the second resin portion 42, and a hooking recess 62 provided on the other of the first resin portion 41 and the second resin portion 42, into which the hooking protrusion 61 hooks.

[0013] Moreover, the motor 9 according to the present disclosure includes a stator 1 and a rotor 91 facing the stator 1.

[0014] In the stator 1 and motor 9 described above, short circuits between the teeth 3 and the coils 12 can be easily prevented.

[0015] (2) First embodiment 1 and 2, a stator 1 constituting a motor 9 includes a stator core 11 including a plurality of insulators 4 and a plurality of coils 12. The stator 1 further includes a bus bar 13.

[0016] (2.1) Stator core 1, stator core 11 has a ring core 2 that is annular around the axis, and a plurality of teeth 3. In other words, ring core 2 and the plurality of teeth 3 configure stator core 11.

[0017] (2.1.1) Ring Core 2, the ring core 2 has an annular shape surrounding a rotation shaft 92 of a rotor 91 that rotates relative to the stator 1. In this embodiment, the ring core 2 has an annular shape when viewed in a direction 200 in which an axis 20 extends (hereinafter referred to as the extension direction 200; see FIG. 1), and the center of the ring core 2 (the position of the axis 20) coincides with the axis of the rotation shaft 92 of the rotor 91. Here, the direction that passes through the axis 20 and is perpendicular to the extension direction 200 is defined as a radial direction D1.

[0018] The ring core 2 has a plurality of steel plates stacked in the extension direction 200. The steel plates are formed of a magnetic material such as silicon steel plate. Here, fitting portions 21 into which a plurality of teeth 3 are fitted are formed at the end of the ring core 2 on the axis center 20 side (hereinafter referred to as the inner side). In this embodiment, 18 fitting portions 21 are formed at the inner end of the ring core 2 at equal intervals in the circumferential direction C1. The ring core 2 constitutes a back yoke of the stator core 11.

[0019] (2.1.2) Teeth The teeth 3 are attached to the ring core 2 so as to protrude inward in the radial direction D1 of the ring core 2. The teeth 3 protrude from the inner peripheral surface of the ring core 2 toward the axis 20. In this embodiment, 18 teeth 3 are provided on the stator core 11. The teeth 3 are molded separately from the ring core 2 and fitted into the ring core 2, integrating the ring core 2 and the teeth 3.

[0020] The teeth 3 are each formed with a fitting portion 31 at an outer end in the radial direction D1, the fitting portion 31 corresponding to the fitting portion 21 of the ring core 2. The fitting portions 31 of the teeth 3 are fitted into the fitting portions 21 of the ring core 2, and the teeth 3 are attached to the ring core 2 integrally.

[0021] 3, a flange 32 that is larger than a middle portion in the radial direction D1 is formed at an inner end portion in the radial direction D1 of each of the teeth 3. The flange 32 prevents the coil 12 and the insulator 4 from falling off toward the inside in the radial direction D1.

[0022] (2.2) Coil As shown in FIGS. 1, 3, and 4, a plurality of coils 12 are wound around the outer peripheral surface 30 of each of a plurality of teeth 3, with a plurality of insulators 4 interposed therebetween. The coils 12 are formed of conductor wires 121. In this embodiment, 18 coils 12 are provided on the stator core 11. The cross-sectional shape of the conductor wires 121 is rectangular. That is, the conductor wires 121 are flat conductor wires. In particular, in this embodiment, the coils 12 are formed coils. The formed coils in this disclosure do not include coils in which a conductor wire with a constant width and thickness is simply wound spirally.

[0023] The formed coil is formed, for example, by bending a plate-shaped conductor wire, which has been formed in advance so that its width and thickness vary along the way, at a predetermined position. Alternatively, a plate-shaped conductor wire with a constant width and thickness may be rolled at a predetermined position, and the width and thickness may be changed along the way, and then the formed coil may be wound into a spiral shape. The formed coil is formed by preparing multiple rectangular plate materials with different lengths, widths, or thicknesses, and joining these plate materials by cold welding, welding, or other methods. The plate materials are made of a so-called low-resistivity material such as copper or aluminum.

[0024] Alternatively, the formed coil may be formed by so-called casting, in which copper or the like is melted and poured into a mold. In other words, the formed coil is formed by adding another process to winding the conductor wire, or by a method other than simple winding.

[0025] 8, in this embodiment, the coils 12 are formed by winding a rectangular conductor wire (conductor wire 121) edgewise. Specifically, the coils 12 are formed in a substantially rectangular shape having two straight portions along the extension direction 200, two straight portions along the circumferential direction C1 at the inner end of the ring core 2, and four corner portions located between adjacent straight portions. Inner peripheral fillets 122 are formed inside the corner portions.

[0026] When the teeth 3 are inserted inside, the coil 12 is wound so as to be close to and along the edge of the ring core 2 at the end in the circumferential direction C1, i.e., the edge extending in the extension direction 200. The inner fillet 122 of the coil 12 and the space between the coil 12 and the teeth 3 are configured to be located outside the extension direction 200 of the teeth 3.

[0027] (2.3) Insulator (2.3.1) First resin part, second resin part As shown in Fig. 3, the insulator 4 is interposed between the stator core 11 and the coil 12 to electrically insulate the stator core 11 from the coil 12. The insulator 4 is made of a resin material, which is an insulating material. The multiple insulators 4 are fitted onto the outer peripheral surface 30 of each of the multiple teeth 3 in the radial direction D1. As shown in Fig. 4, each of the multiple insulators 4 has a first resin portion 41 and a second resin portion 42.

[0028] The first resin portion 41 is located on the inner side in the radial direction D1. The first resin portion 41 is a member (portion) that constitutes at least the inner end portion in the radial direction D1 of the insulator 4. Suitable resin materials that constitute the first resin portion 41 include thermoplastic resins such as PPS (Poly Phenylene Sulfide), LCP (Liquid Crystal Polymer), PA (Polyamide), PBT (Poly Butylene Terephthalate), and PET (Poly Ethylene Terephthalate), but are not limited to these.

[0029] The second resin portion 42 is located on the outside in the radial direction D1. The second resin portion 42 is a member (portion) that constitutes at least the outer end portion in the radial direction D1 of the insulator 4. As a resin material that constitutes the second resin portion 42, for example, thermoplastic resin such as PPS, LCP, PA, PBT, or PET is preferably used, but the resin material is not limited to these.

[0030] Each of the multiple insulators 4 is prepared as a separate body consisting of a first resin part 41 and a second resin part 42, which are connected as described below to form an integrated whole.

[0031] (2.3.2) First flange, second flange and cylindrical portion Each of the plurality of insulators 4 has a first flange 51, a second flange 52, and a cylindrical portion 50.

[0032] The first flange 51 is located on the inner side in the radial direction D1. In the first embodiment, the first flange 51 constitutes the inner end portion of the insulator 4 in the radial direction D1. That is, the first flange 51 is included in the first resin portion 41 that constitutes the inner end portion of the insulator 4 in the radial direction D1.

[0033] The second flange 52 is located on the outer side in the radial direction D1. In the first embodiment, the second flange 52 constitutes the outer end portion of the insulator 4 in the radial direction D1. That is, the second flange 52 is included in the second resin portion 42 that constitutes the outer end portion of the insulator 4 in the radial direction D1.

[0034] The tubular portion 50 is located between the first flange 51 and the second flange 52 and faces the outer circumferential surfaces 30 of the plurality of teeth 3. In the first embodiment, the first resin portion 41 includes at least a portion of the tubular portion 50.

[0035] More specifically, the first resin portion 41 includes most of the cylindrical portion 50 except for a portion of the outer end portion in the radial direction D1. Of the cylindrical portion 50 included in the first resin portion 41, the inner end portion in the radial direction D1 is referred to as a first portion 411.

[0036] The second resin part 42 includes the remaining portion of the tubular part 50. That is, the second resin part 42 includes the outer end part of the tubular part 50 in the radial direction D1 excluding the part included in the first resin part 41. Of the tubular part 50 included in the second resin part 42, the outer end part in the radial direction D1 is defined as a second part 421. In the first embodiment, the tubular part 50 included in the second resin part 42 is only the second part 421.

[0037] The first portion 411 and the second portion 421 overlap in a direction perpendicular to the radial direction D1 (the extension direction 200 and the circumferential direction C1 of the ring core 2). More specifically, the first portion 411 and the second portion 421 overlap between the teeth 3 and the coil 12 so as to be located on the tooth 3 side (inside in the overlapping direction) and the coil 12 side (outside in the overlapping direction). In the first embodiment, the first portion 411 is located on the tooth 3 side (inside), and the second portion 421 is located on the coil 12 side (outside).

[0038] (2.4) Snap-fit ​​part 5 to 7, each of the multiple insulators 4 has a snap-fit ​​portion 6. The snap-fit ​​portion 6 is located between the first resin portion 41 and the second resin portion 42 and connects the first resin portion 41 and the second resin portion 42. The snap-fit ​​portion 6 has a hooking protrusion 61 provided on one of the first resin portion 41 and the second resin portion 42, and a hooking recess 62 provided on the other of the first resin portion 41 and the second resin portion 42 and into which the hooking protrusion 61 hooks.

[0039] In the first embodiment, the snap fit portion 6 has a hooking protrusion 61 provided in the first resin portion 41 and a hooking recess 62 provided in the second resin portion .

[0040] 5 and 6, the hooking protrusions 61 are formed on the first portions 411 located on the tooth 3 side (inner side) between the teeth 3 and the coil 12, so as to protrude from the tooth 3 side (inner side) toward the coil 12 side (outer side). As shown in Fig. 7, the hooking protrusions 61 extend in the circumferential direction C1. As shown in Fig. 5 and 6, the shape of the hooking protrusions 61 in a cross section perpendicular to the circumferential direction C1 is an inclined triangle such that the protruding height from the surface of the first portion 411 decreases toward the second flange 52 of the second resin portion 42.

[0041] The hooking recess 62 is formed as a through hole penetrating inward and outward in a portion of the second portion 421 located on the coil 12 side (outward) between the tooth 3 and the coil 12, corresponding to the hooking protrusion 61. The hooking protrusion 61 inserted into the through hole is hooked onto a portion of the side wall of the through hole constituting the hooking recess 62, thereby preventing the hooking protrusion 61 (first portion 411) from slipping out of the hooking recess 62 (second portion 421). In other words, the hooking protrusion 61 constitutes a claw portion of the snap-fit ​​portion 6, and the hooking recess 62 accommodates the hooking protrusion 61 and constitutes a storage recess in which the hooking protrusion 61 is hooked.

[0042] 5, in the first embodiment, the snap-fit ​​portions 6 are formed at both ends of the first resin portion 41 and the second resin portion 42 in the extension direction 200. That is, the snap-fit ​​portions 6 are formed at one or more opposing locations on the insulator 4.

[0043] In addition, in the radial direction D1, the length L1 from one end (the end closer to the end) of the insulator 4 to the position where the snap fit portion 6 is formed is 1 / 3 of the length L0 of the insulator 4.

[0044] (2.5) Busbar As shown in FIG. 1 , busbar 13 is connected to conductor 121. Busbar 13 makes it easier to pass a large current. Busbar 13 is electrically connected to conductor 121 of each of coils 12 to form connections for U-phase, V-phase, and W-phase. Busbar 13 is arranged on the opposite side of coil 12 from axis 20 (i.e., the outside). Busbar 13 is adjacent to the outside of coil 12 in radial direction D1. This makes it easier to prevent the size of stator 1 from increasing in the extension direction 200.

[0045] Moreover, the busbars 13 are disposed adjacent to the ring core 2 in the extension direction 200. The stator core 11, the coils 12, the insulators 4, and the busbars 13 form the stator 1.

[0046] (2.6) Motor, rotor As shown in Fig. 2, the motor 9 includes a stator 1 and a rotor 91. The rotor 91 has a rotary shaft 92 and rotates around the axis of the rotary shaft 92. The rotor 91 faces the stator 1 in the radial direction D1. In the motor 9, magnetic flux generated from a plurality of coils 12 in the stator 1 (18 coils in Fig. 1) generates an electromagnetic force that rotates the rotor 91.

[0047] The rotor 91 has a cylindrical rotor core 93, a plurality of magnets 94, and a rotating shaft 92. The rotating shaft 92 is held inside the rotor core 93. The magnets 94 are arranged in a polygonal shape.

[0048] (2.7) Stator manufacturing method The method for manufacturing the stator 1 will be described with reference to Figures 9 to 11. The method for manufacturing the stator 1 includes first to sixth steps in this order.

[0049] (2.7.1) First step The first step is a forming step of the coil 12 shown in Fig. 9. In the first step, one coil 12 that constitutes the plurality of coils 12 is formed by bending and winding the conductive wire 121. The coil 12 formed in the first step is an air-core coil that does not have a core, and a space is formed inside in which the teeth 3 and the insulators 4 can be arranged.

[0050] (2.7.2) Second step The second step is a step of attaching the first resin part 41 to the coil 12. As shown in Fig. 10, the first resin part 41 is inserted into the internal space of the coil 12 from the inside in the radial direction D1. The first flange 51 comes into contact with the inner end surface of the coil 12 in the radial direction D1.

[0051] (2.7.3) Third step The third step is a step of connecting the first resin part 41 and the second resin part 42. In the third step, the first resin part 41 and the second resin part 42 of the unit constructed in the second step are connected. The second portion 421 of the second resin part 42 is inserted into the space inside the coil 12 from the outside in the radial direction D1, and the first resin part 41 and the second resin part 42 are connected by the snap-fit ​​part 6. More specifically, as shown in FIGS. 5 and 6 , the second portion 421 of the second resin part 42 is inserted so as to cover the outside of the first portion 411 of the first resin part 41 inserted inside the coil 12. When the second portion 421 is inserted, the tip of the second portion 421 comes into contact with the slope of the hooking protrusion 61 of the first resin part 41, and the hooking protrusion 61 elastically deforms, causing the tip of the second portion 421 to climb over the hooking protrusion 61. When the tip of the second part 421 climbs over the hooking protrusion 61, the hooking recess 62 is inserted into the hooking recess 62 formed in the second part 421 and hooks onto the inner wall of the hooking recess 62, preventing the first part 411 and the second part 421 from coming off, and completing the connection between the first resin part 41 and the second resin part 42 by the snap-fit ​​part 6. As shown in Fig. 10 , in the third step, a coil unit 14 (see reference) consisting of the coil 12 and the insulator 4 is formed. That is, the third step is also a step of forming the insulator 4.

[0052] (2.7.4) Fourth step As shown in FIG. 10, the fourth step is a step of attaching the teeth 3 to the coil unit 14 formed in the third step. The teeth 3 are inserted into the internal space of the insulator 4 (and the coil 12) from the inside in the radial direction D1. The flange 32 contacts the inner surface of the first flange 51 in the radial direction D1. In the fourth step, as shown in FIG. 11, a teeth unit 15 is formed in which the coil 12, the first resin part 41, the second resin part 42, and the teeth 3 are attached.

[0053] (2.7.5) Fifth step The fifth step is a step of attaching the tooth unit 15 constructed in the fourth step to the ring core 2. The fitting portions 31 of the teeth 3 are fitted into the fitting portions 21 (see FIG. 2) formed on the ring core 2 by an appropriate method such as press fitting.

[0054] The first to fifth steps result in a completed stator 1.

[0055] (2.8) Summary of the first embodiment The insulator 4 has a first resin portion 41 located on the inside in the radial direction D1 and a second resin portion 42 located on the outside in the radial direction D1, which are connected by a snap-fit ​​portion 6. Therefore, the insulator 4 (cylindrical portion 50) clearly separates the space inside the cylindrical portion 50 of the insulator 4 where the teeth 3 are located from the space outside the cylindrical portion 50 of the insulator 4 where the coil 12 is located. This prevents the coil 12 and the tooth 3 from short-circuiting.

[0056] Since the coil 12 is wound so as to be close to and along the sides (sides at both ends in the circumferential direction C1) of the teeth 3 extending in the extension direction 200, the output of the motor 9 is not reduced. Furthermore, the inner fillet 122 of the coil 12 and the space between the coil 12 and the teeth 3 are located outside the extension direction 200 of the teeth 3, and the snap-fit ​​portion 6 is formed facing this space. This allows elastic deformation of the hooking protrusion 61 or the hooking recess 62 when the hooking protrusion 61 is attached to the hooking recess 62. Furthermore, since the existing dead space is utilized, it is possible to avoid further enlargement of the stator 1.

[0057] The snap fit portions 6 are formed at both ends of the first resin portion 41 and the second resin portion 42 in the extension direction 200. This makes it possible to further strengthen the connection between the first resin portion 41 and the second resin portion 42.

[0058] Furthermore, since the first portion 411 and the second portion 421 overlap in a direction perpendicular to the radial direction D1, the first resin portion 41 and the second resin portion 42 can be easily positioned relative to each other.

[0059] (3) Second embodiment The stator 1 according to the second embodiment will be described below with reference to Fig. 12. Note that the stator 1 according to the second embodiment is mostly the same as the stator 1 according to the first embodiment, and therefore the same reference numerals are used for the overlapping components, and detailed descriptions thereof will be incorporated herein.

[0060] In the first embodiment, the snap-fit ​​portion 6 has a hooking protrusion 61 provided in the first resin portion 41 and a hooking recess 62 provided in the second resin portion 42, and the hooking protrusion 61 is formed to protrude from the tooth 3 side (inside) toward the coil 12 side (outside).

[0061] In contrast to this, in the second embodiment, the second portion 421 is located on the tooth 3 side (inside) and the first portion 411 is located on the coil 12 side (outside), so they overlap. The hooking protrusion 61 protrudes from the coil 12 side toward the tooth 3 side.

[0062] Since the hooking protrusion 61 protrudes from the coil 12 side toward the tooth 3 side, when the first resin part 41 and the second resin part 42 are connected by the snap fit part 6, it can be seen from the inside of the insulator 4 that the hooking protrusion 61 is inserted into the hooking recess 62.

[0063] Furthermore, since the length L1 from one end (the closer end) of the insulator 4 at the position where the snap fit portion 6 is formed is 1 / 3 or less of the length L0 of the insulator 4, the hooking protrusion 61 and the hooking recess 62 can be easily seen from outside the end in the radial direction D1.

[0064] (4) Third embodiment The stator 1 according to the third embodiment will be described below with reference to Fig. 13. Note that the stator 1 according to the third embodiment is mostly the same as the stator 1 according to the first and second embodiments, and therefore the same reference numerals are used for the overlapping components, and detailed descriptions thereof will be incorporated herein.

[0065] In the first and second embodiments, the snap-fit ​​portion 6 has a hooking protrusion 61 provided in the first resin portion 41 and a hooking recess 62 provided in the second resin portion 42. In contrast to this, in the third embodiment, the snap-fit ​​portion 6 has a hooking recess 62 provided in the first resin portion 41 and a hooking protrusion 61 provided in the second resin portion 42. Furthermore, the hooking protrusion 61 formed in the second portion 421 is inserted into a hole 412 formed in the first portion 411. The hooking recess 62 is formed in a wall portion on the coil 12 side (outside) of the hole 412.

[0066] In the third embodiment, most of the hooking protrusion 61 is covered by the first portion 411, so the hooking protrusion 61 is less likely to be damaged.

[0067] (5) Fourth embodiment The stator 1 according to the fourth embodiment will be described below with reference to Fig. 14. Note that the stator 1 according to the fourth embodiment is mostly the same as the stator 1 according to the third embodiment, and therefore the same reference numerals are used for the overlapping components, and detailed descriptions thereof will be incorporated herein.

[0068] In the third embodiment, the hook recess 62 is formed in the wall portion on the coil 12 side (outside) of the hole 412. In contrast to this, in the fourth embodiment, the hook recess 62 is formed in the wall portion on the tooth 3 side (inside) of the hole 412.

[0069] Since the hooking protrusion 61 protrudes from the coil 12 side toward the tooth 3 side, when the first resin part 41 and the second resin part 42 are connected by the snap fit part 6, it can be seen from the inside of the insulator 4 that the hooking protrusion 61 is inserted into the hooking recess 62.

[0070] (5) Variations Next, modified examples of the first to fourth embodiments will be listed below. The following modified examples may be realized in appropriate combination.

[0071] In the first to fourth embodiments, the ring core 2 is ultimately formed as a single unit. In this case, it may be formed by joining multiple divided bodies together, or may be formed as a single unit from the beginning. The ring core 2 may also be formed by combining multiple divided bodies without joining them. In this case, the multiple divided bodies are housed in a housing and arranged in an annular shape to form the ring core 2. The multiple divided bodies are multiple split cores divided into portions corresponding to one tooth 3, and are divided into multiple parts in the circumferential direction C1 of the ring core 2.

[0072] The snap fit portion 6 may be formed at only one end of the first resin portion 41 and the second resin portion 42 in the extension direction 200 in which the axis 20 extends.

[0073] The hooking recess 62 may be formed by a depression formed on the surface of the first part 411 or the second part 421, rather than by a through hole that penetrates the first part 411 of the first resin part 41 or the second part 421 of the second resin part 42.

[0074] It is preferable that the length L1 from one end (the closer end) of the insulator 4 at the position where the snap fit portion 6 is formed is less than 1 / 3 of the length L0 of the insulator 4, but the length L1 may be more than 1 / 3 of the length L0.

[0075] In the first to fourth embodiments, the number of fitting portions 21, teeth 3, and coils 12 provided on one stator 1 is 18, but the number is not limited to 18.

[0076] (6) Summary As is clear from the above-described embodiment and its modified examples, the stator (1) of the first aspect includes a ring core (2) that is annular around an axis (20), a plurality of teeth (3), a plurality of insulators (4), and a plurality of coils (12). The plurality of teeth (3) are attached to the ring core (2) so as to protrude inward from the ring core (2) in a radial direction (D1) of the ring core (2). The plurality of insulators (4) are fitted onto the outer peripheral surface (30) of each of the plurality of teeth (3) around the radial direction (D1). The plurality of coils (12) are wound around the outer peripheral surface (30) of each of the plurality of teeth (3) via each of the plurality of insulators (4). Each of the multiple insulators (4) has a first resin portion (41), a second resin portion (42), and a snap-fit ​​portion (6) located between the first resin portion (41) and the second resin portion (42) and connecting the first resin portion (41) and the second resin portion (42). The first resin portion (41) is located on the inner side in the radial direction (D1). The second resin portion (42) is located on the outer side in the radial direction (D1). The snap-fit ​​portion (6) has a hooking protrusion (61) provided on one of the first resin portion (41) and the second resin portion (42) and a hooking recess (62) provided on the other of the first resin portion (41) and the second resin portion (42) and into which the hooking protrusion (61) is hooked.

[0077] According to the first aspect, it is easy to prevent short circuits between the plurality of teeth (3) and the plurality of coils (12).

[0078] The second aspect can be realized by combining it with the first aspect. In the second aspect, the snap-fit ​​portion 6 is formed only at one end of the first resin portion 41 and the second resin portion 42 in the extension direction 200 of the axis 20.

[0079] According to the second aspect, the snap fit portion (6) can have a simple structure.

[0080] The third aspect can be realized by combining with the first aspect. In the third aspect, the snap-fit ​​portion (6) is formed at each of the ends of the first resin portion (41) and the second resin portion (42) in the extension direction (200) of the axis (20).

[0081] According to the third aspect, the connection between the first resin portion (41) and the second resin portion (42) by the snap fit portion (6) can be made stronger.

[0082] The fourth aspect can be realized by combining with any one of the first to third aspects. In the fourth aspect, the plurality of coils (12) are formed by winding a rectangular conductor wire by edgewise bending.

[0083] According to the fourth aspect, it is easy to avoid the stator (1) from becoming large.

[0084] The fifth aspect can be realized by combining any one of the first to fourth aspects. In the fifth aspect, the snap-fit ​​portion (6) has a hooking protrusion (61) provided in the first resin portion (41) and a hooking recess (62) provided in the second resin portion (42).

[0085] The sixth aspect can be realized by combining any one of the first to fourth aspects. In the sixth aspect, the snap-fit ​​portion (6) has a hook recess (62) provided in the first resin portion (41) and a hook protrusion (61) provided in the second resin portion (42).

[0086] The seventh aspect can be realized by combining it with any one of the first to sixth aspects. In the seventh aspect, the hooking projections (61) protrude from the tooth (3) side toward the coil (12) side.

[0087] The eighth aspect can be realized by combining it with any one of the first to sixth aspects. In the eighth aspect, the hooking projections (61) protrude from the coil (12) side toward the teeth (3) side.

[0088] According to the eighth aspect, it is easy to visually confirm from the inside of the insulator (4) that the hooking protrusions (61) are inserted into the hooking recesses (62).

[0089] The ninth aspect can be realized by combining with any one of the first to eighth aspects. The motor (9) of the ninth aspect includes the stator (1) of any one of the first to eighth aspects and a rotor (91) facing the stator (1).

[0090] According to the ninth aspect, it is easy to prevent short circuits between the plurality of teeth (3) and the plurality of coils (12). [Explanation of symbols]

[0091] 1 stator 12 coils 2 ring core 3 Teeth 4 insulators 41 First resin part 42 Second resin part 6 Snap fit part 61 Hook protrusion 62 Hook recess 9 Motor 91 Rotor D1 Radial direction

Claims

1. a ring core that is annular around the axis; a plurality of teeth attached to the ring core so as to protrude radially inward from the ring core; a plurality of insulators fitted onto outer peripheral surfaces of the plurality of teeth in the radial direction; a plurality of coils wound around the outer circumferential surface of each of the plurality of teeth via each of the plurality of insulators, Each of the plurality of insulators comprises: a first resin portion located on the inner side in the radial direction; a second resin portion located on the outer side in the radial direction; a snap-fit ​​portion located between the first resin portion and the second resin portion to connect the first resin portion and the second resin portion, the snap-fit ​​portion having a hooking protrusion provided on one of the first resin portion and the second resin portion, and a hooking recess provided on the other of the first resin portion and the second resin portion to be hooked onto the hooking protrusion; Stator.

2. the snap-fit ​​portion is formed at only one end of the first resin portion and the second resin portion in an extension direction of the axis, The stator according to claim 1 .

3. The snap-fit ​​portions are formed at both ends of the first resin portion and the second resin portion in an extension direction of the axis. The stator according to claim 1 .

4. The plurality of coils are formed by winding a rectangular conductor wire by edgewise bending. The stator according to claim 1 .

5. The snap-fit ​​portion has the hooking protrusion provided in the first resin portion and the hooking recess provided in the second resin portion. The stator according to claim 1 .

6. The snap-fit ​​portion has the hook recess provided in the first resin portion and the hook protrusion provided in the second resin portion. The stator according to claim 1 .

7. The hooking protrusions protrude from the teeth side toward the coil side. The stator according to claim 1 .

8. The hooking protrusions protrude from the coil side toward the teeth side. The stator according to claim 1 .

9. A stator according to any one of claims 1 to 8; a rotor facing the stator, Motor.

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