Insulators, stators, and motors

Abstract

To provide a technique that allows an insulating member to be easily placed in a recess of each insulator attached to adjacent teeth.SOLUTION: An insulator 300 attached to teeth 211 has a first flange 400, a second flange 500, and a body 600. A first recess 450 and a second recess 460 are formed in an outer circumferential surface 400A of the first flange 400 on one side in the circumferential direction and on the other side in the circumferential direction from an opening 610a of a through hole 610. The first recess 450 is opened on the outside in the radial direction, one side in the circumferential direction, and the other side in the axial direction. The second recess 460 is opened on the outside in the radial direction, the other side in the circumferential direction, and the other side in the axial direction. The first flange 400 has a side surface 403 provided with a protrusion 403A that protrudes to one side in the circumferential direction, and a side surface 404 provided with a protrusion 404A that protrudes to the other side in the circumferential direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an insulator attached to teeth of a stator core, a stator including the insulator attached to the teeth of the stator core, and a motor.

Background Art

[0002] Various motors including a stator and a rotor are used as a compressor drive motor, a vehicle drive motor, an in-vehicle device drive motor, etc. In particular, a motor (referred to as a "concentrated winding motor") in which a stator winding is wound around teeth of a stator core in a concentrated winding method is used. In a concentrated winding motor, the stator winding is wound around the teeth via an insulator (electrical insulator). Further, in such a concentrated winding motor, in order to increase the number of turns of the stator winding (that is, to increase the occupation ratio of the stator winding in the slot), a motor including a stator core having a split structure has been proposed. The split structure stator core is composed of a plurality of split cores obtained by splitting the stator core.

[0003] Motors using a split structure stator core are disclosed in, for example, Patent Documents 1 and 2. The motors disclosed in Patent Documents 1 and 2 are composed of a stator core, a plurality of insulators, a stator winding, and a plurality of insulating members. The stator core is composed of a first core member having a plurality of teeth and a second core member having a yoke. Insulators are attached to the teeth of the first core member. The stator winding is wound around the insulator. The insulator insulates the stator winding and the teeth from each other. The insulator has a first flange portion, a second flange portion, and a body portion. The first flange portion and the second flange portion extend in the axial direction and the circumferential direction. The second flange portion is disposed radially inward of the first flange portion. The body portion is provided between the first flange portion and the second flange portion and extends in the radial direction. A through hole that opens to the outer peripheral surface of the first flange portion and the inner peripheral surface of the second flange portion and into which the teeth are inserted is formed in the body portion. On the outer circumferential surface of the first flange, a first recess and a second recess are formed on one side (first circumferential side) and the other side (second circumferential side) of the through hole in the circumferential direction. The first recess is open on the radially outer side and on one side in the circumferential direction. That is, the first recess is formed by a bottom surface extending in the axial direction and circumferential direction, and wall surfaces connected to one side (first axial side), the other side (second axial side), and the other side (second circumferential side) of the bottom surface in the axial direction. The second recess is open on the radially outer side and on the other side in the circumferential direction. That is, the second recess is formed by a bottom surface extending in the axial direction and circumferential direction, and wall surfaces connected to one side (first axial side), the other side, and the other side in the circumferential direction) of the bottom surface in the axial direction. The stator core is constructed by assembling the first core member and the second core member with an insulator attached to each tooth of the first core member. The insulating member has a first end and a second end that extend in the axial and circumferential directions on one and the other circumferential side. The insulating member is positioned between two circumferentially adjacent insulators and the yoke of the stator core, straddling the two adjacent insulators. That is, the insulating member is inserted into the gap between the two circumferentially adjacent insulators and the yoke of the stator core. Its first end is positioned in a second recess of the insulator located on one side in the circumferential direction, and its second end is positioned in a first recess of the insulator located on the other side in the circumferential direction. The insulating member insulates the stator winding from the yoke of the stator core. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2018-153056 [Patent Document 2] Japanese Patent Publication No. 2018-153057 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the insulators disclosed in Patent Documents 1 and 2, the first and second recesses formed in the first flange portion are not open on one axial side and the other axial side. That is, the first and second recesses have wall surfaces on one axial side and the other axial side. Therefore, when inserting the insulating member into the gap between two circumferentially adjacent insulators and the yoke of the stator core, it is necessary to tilt the insulating member so that the first end is positioned in the second recess of the insulator located on one circumferential side, and the second end is positioned in the first recess of the insulator located on the other circumferential side. Specifically, it is necessary to tilt the first end of the insulating member with respect to the extending direction of the outer circumferential surface of the first flange portion of the insulator located on one circumferential side, and to tilt the second end of the insulating member with respect to the extending direction of the outer circumferential surface of the first flange portion of the insulator located on the other circumferential side. Inserting the insulating material into the gap between the insulator and the stator core yoke while it is tilted is a cumbersome and time-consuming process. Furthermore, there is a risk of the insulating material coming into contact with and damaging the stator core. The present invention was conceived in view of these points, and aims to provide an insulator in which an insulating member can be easily placed in the recesses of each insulator attached to adjacent teeth. [Means for solving the problem]

[0006] The first invention relates to an insulator. The insulators of the present invention are spaced apart in the circumferential direction and are attached to each of the multiple teeth that extend in the radial and axial directions. The insulator of the present invention has a first flange portion, a second flange portion, and a body portion. The first flange extends in the axial and circumferential directions. The first flange has an outer peripheral surface on the radially outward side, an inner peripheral surface on the radially inward side, a first side on one circumferential side, a second side on the other circumferential side, a first end surface on one axial side, and a second end surface on the other axial side. The second flange is positioned radially inward from the first flange and extends in the axial and circumferential directions. The second flange has a second outer peripheral surface on the radially outward side, a second inner peripheral surface on the radially inward side, a third side on one circumferential side, a fourth side on the other circumferential side, a third end surface on one axial side, and a fourth end surface on the other axial side. The body has a through-hole located between the first and second flanges. The through-hole extends radially and has openings on the outer circumferential surface of the first flange and the inner circumferential surface of the second flange. The through-hole is formed so that teeth can be inserted. Furthermore, the first flange portion has a first recess formed on the first outer surface, in the region on one side of the through hole in the circumferential direction, which is recessed radially inward. In addition, the first flange portion has a second recess formed on the first outer surface, in the region on the other side of the through hole in the circumferential direction, which is recessed radially inward. The first recess is, It is formed by a first bottom surface extending in the axial and circumferential directions, a first wall surface connected to one axial end of the first bottom surface and extending in the circumferential and radial directions, and a second wall surface connected to the other circumferential end of the first bottom surface and extending in the axial and radial directions. It extends in the axial and circumferential directions, and is open on the radially outer side, one circumferential side, and the other axial side. The second recess is, It is formed by a second bottom surface extending in the axial and circumferential directions, a third wall surface connected to one end of the second bottom surface in the axial direction and extending in the circumferential and radial directions, and a fourth wall surface connected to one end of the second bottom surface in the circumferential direction and extending in the axial and radial directions. It extends in the axial and circumferential directions, and is open on the radially outer side, the other circumferential side, and the other axial side. In the insulator of the present invention, the first recess and the second recess formed in the first flange portion of the insulator are open on the other axial side. This eliminates the need to tilt the insulating member when inserting it into the gap between two circumferentially adjacent insulators and the yoke of the stator core, as is the case when using the insulators disclosed in Patent Documents 1 and 2. By using the insulator of the first invention, the insulating member can be easily positioned within the recesses of the insulators attached to adjacent teeth. In a different embodiment of the first invention, a first projection is formed on the first side surface at a location on the other axial side of the through hole, projecting in one circumferential direction. Additionally, a second projection is formed on the second side surface at a location on the other axial side of the through hole, projecting in the other circumferential direction. By using the insulator of this embodiment, when the first end of the insulating member is positioned in the second recess of the insulator located on one side in the circumferential direction, and the second end of the insulating member is positioned in the first recess of the insulator located on the other side in the circumferential direction, it is possible to prevent the insulating member from moving in the other axial direction. In a different embodiment of the first invention, the first projection has an end face that extends radially and circumferentially, connected to the first side surface on one axial side. The second projection also has an end face that extends radially and circumferentially, connected to the second side surface on one axial side. By using this embodiment of the insulator, it is possible to more reliably prevent the insulating member from moving in the other axial direction. can. In a different embodiment of the first invention, the first flange has a third projection that protrudes radially outward in a region on the first outer surface, on one side in the circumferential direction from the through hole and on one side in the axial direction. Furthermore, the first flange has a fourth projection that protrudes radially outward in a region on the first outer surface, on the other side in the circumferential direction from the through hole and on one side in the axial direction. Furthermore, at least a portion of the first wall surface and the second wall surface of the first recess is formed by the outer wall surface of the first projection. Also, at least a portion of the third wall surface and the fourth wall surface of the second recess is formed by the outer wall surface of the second projection. By using the insulator of this embodiment, the first recess and the second recess can be formed more easily. In a different embodiment of the first invention, the second flange portion has a fifth projection that protrudes from the third end face in one axial direction. The fifth projection also has a sixth projection that protrudes radially inward. Furthermore, the second flange portion has a seventh projection between the through hole and the sixth projection. The seventh projection protrudes radially inward from the second inner circumferential surface of the second flange portion and extends radially and circumferentially. The stator winding wrapped around the fifth projection is restricted from moving in one axial direction by the sixth projection. Furthermore, the seventh projection can increase the dielectric strength between the stator winding wrapped around the sixth projection and the teeth inserted into the through-hole of the insulating member. By using an insulator of this form, the dielectric strength can be increased. The second invention relates to a stator. The stator of the present invention comprises a stator core, a plurality of insulators, a stator winding, and a plurality of insulating members. The stator core comprises a yoke extending in the axial and circumferential directions, and a plurality of teeth provided radially inward of the yoke, spaced apart in the circumferential direction, and extending in the axial and radial directions. Multiple insulators are attached to each tooth. The stator windings are wound around each of the multiple insulators. Each insulating member is positioned between two circumferentially adjacent insulators and the yoke of the stator core, straddling the two insulators. In this invention, any of the aforementioned insulators is used as the insulator. Furthermore, the insulating member has a first end on one side in the circumferential direction that extends in the axial and circumferential directions, and a second end on the other side in the circumferential direction that extends in the axial and circumferential directions. The first end of the insulating member is positioned within a second recess formed in the first flange of one of two adjacent insulators, which is located on one side in the circumferential direction. The second end of the insulating member is positioned within a first recess formed in the first flange of the other of two adjacent insulators, which is located on the other side in the circumferential direction. The second invention has the same effect as the insulator described above. In a different embodiment of the second invention, the insulating member has a central portion that extends axially and radially between the first end and the second end. The central part of the insulating member is positioned between the second side surface of the first flange of the insulator located on one side in the circumferential direction of two adjacent insulators, and the first side surface of the first flange of the insulator located on the other side in the circumferential direction. In this embodiment, it is possible to prevent the insulating member having a central portion from moving in the other direction in the axial direction. In a different embodiment of the second invention, the stator core comprises a first core member having a plurality of teeth and a second core member having a yoke. In this embodiment, the stator winding can be wound around the insulator before assembling the first core member and the second core member. Thereby, the number of turns of the stator winding can be increased, and the space factor of the stator winding can be increased. The third invention relates to an electric motor. The electric motor of the present invention includes a stator and a rotor that is rotatable relative to the stator. And any one of the stators described above is used as the stator. The present invention has the same effects as any one of the insulators described above or any one of the stators described above.

Advantages of the Invention

[0007] By using the insulator, the stator, and the electric motor of the present invention, the insulating member can be easily arranged in the recesses of the insulators attached to the adjacent teeth respectively.

Brief Description of the Drawings

[0008] [Figure 1] It is a perspective view of an embodiment of the stator of the present invention. [Figure 2] It is a view seen from the direction of arrow II in FIG. 1. [Figure 3] It is a view in which the yoke of the stator core is omitted from FIG. 1. [Figure 4] It is a view showing the stator core constituting the stator of one embodiment. [Figure 5] It is a perspective view of an embodiment of the insulator of the present invention. [Figure 6] It is a perspective view of an embodiment of the insulator of the present invention seen from different directions. [Figure 7] It is a view seen from the direction of arrow VII in FIG. 5. [Figure 8] It is a view seen from the direction of arrow VIII in FIG. 5. [Figure 9] It is a view seen from the direction of arrow IX in FIG. 5. [Figure 10] It is a cross-sectional view seen from the direction of X-X line in FIG. 7. [Figure 11] It is a view for explaining the operation of attaching the insulator to the teeth. [Figure 12] This is a perspective view of an example of an insulating material. [Figure 13] This figure shows an insulator according to one embodiment attached to adjacent teeth. [Figure 14] This diagram illustrates the process of arranging an example of an insulating component. [Figure 15] This figure shows an example of an insulating component in place. [Figure 16] This diagram illustrates the process of arranging different insulating materials. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. In this specification, the term "axial direction" refers to the direction in which the rotor's rotational centerline P extends (direction A shown in the figures) when the rotor is positioned to rotate relative to the stator. The direction of arrow A1 shown in the figures (for example, the upward direction in Figures 5 to 8) is referred to as the "one axial side" or "first axial side." The direction of arrow A2 shown in the figures (for example, the downward direction in Figures 5 to 8) is referred to as the "other axial side" or "second axial side." The term "circumferential direction" refers to the circular direction (direction B shown in the figure) centered on the rotation centerline P, as viewed from one axial side or the other axial side, when the rotor is positioned to rotate relative to the stator. Furthermore, when viewed from one axial side (see, for example, Figure 2), the counterclockwise direction (direction of arrow B1 shown in the figure) is called the "circumferential side" or "first circumferential side." Furthermore, when viewed from one axial side (see, for example, Figure 2), the clockwise direction (direction of arrow B2 shown in the figure) is called the "other circumferential side" or "second circumferential side." The term "radial direction" refers to the direction of extension of a line passing through the rotation centerline P, as viewed from one axial side or the other axial side, when the rotor is positioned to rotate relative to the stator (direction C shown in the figure). The direction of arrow C1 shown in the figure (direction toward the rotation centerline P) is called the "radial inner side" or "radial first side." The direction of arrow C2 shown in the figure (direction away from the rotation centerline P1) is called the "radial outer side" or "radial second side." Furthermore, with respect to insulators, the terms "axial direction," "circumferential direction," and "radial direction" refer to the "axial direction," "circumferential direction," and "radial direction" when the insulator is mounted on the teeth of the stator core. Furthermore, with respect to insulating members, the terms "axial direction," "circumferential direction," and "radial direction" refer to the "axial direction," "circumferential direction," and "radial direction" when the insulating member is inserted into the gap between two circumferentially adjacent insulators and the yoke of the stator core. Of course, "one side" or "first side" and "the other side" or "second side" can also be defined in the opposite direction.

[0010] A stator 100, which constitutes one embodiment of the electric motor of the present invention, will be described with reference to Figures 1 to 12. Figures 1 to 3 show a stator 100 of one embodiment. Figure 4 shows a stator core 200 that constitutes the stator 100 of one embodiment. Figures 5 to 10 show an insulator 300 of one embodiment. Figure 11 is a diagram illustrating the operation of attaching the insulator 300 of one embodiment to the teeth 211 (tooth base 212) of the stator core 200 of one embodiment. Figure 12 is a diagram showing an insulating member 800 of one embodiment.

[0011] As shown in Figures 1 to 3, the stator 100 of one embodiment is composed of a stator core 200, a plurality of insulators 300, a stator winding 700, and a plurality of insulating members 800. Note that in Figures 1 and 3, the stator winding 700 is omitted from the illustration to facilitate understanding of the structure of the insulator 300.

[0012] The stator core 200 is formed in a cylindrical shape and has a core end face 200A on one axial side (the first axial side) and a core end face 200B on the other axial side (the second axial side). The stator core 200 is configured as a segmented stator core. In this embodiment, the stator core 200 is composed of a first core member 210 and a second core member 220, as shown in Figure 4.

[0013] The first core member 210 (referred to as the "inner core") is composed of a laminate formed by stacking multiple electromagnetic steel sheets using crimping protrusions 216. The first core member 210 has a plurality of teeth 211 that are spaced apart in the circumferential direction and extend in the axial and radial directions. Each tooth 211 has a tooth base 212 that extends in the axial and radial directions, and a tooth tip 213 that is provided radially inward of the tooth base 212 and extends in the axial and circumferential directions. A tooth tip surface 214 is formed on the radially inward side of the tooth tip 213. The tip portion 213 of tooth 211 is connected by a connecting portion 215.

[0014] The second core member 220 (referred to as the "outer core") is composed of a laminate formed by stacking multiple electromagnetic steel sheets using crimping protrusions 226. The second core member 220 has a yoke 221 that extends in the axial and circumferential directions. The yoke 221 has an outer circumferential surface 222 and an inner circumferential surface 223. The inner circumferential surface 223 of the yoke has a recess-forming surface 224a that is recessed radially outward. The recess-forming surface 224a forms a recess 224 into which the radially outer end of the teeth 211 (more specifically, the tooth base 212) of the first core member 220 can be fitted. The inner circumferential surface 223 of the yoke has inner circumferential surface portions 223a and 223b formed between two circumferentially adjacent recesses 224 (recess-forming surfaces 224a). The inner circumferential surface portions 223a (223b) of the yoke are inclined such that the thickness of the yoke 221 decreases from the connection point between the inner circumferential surface portions 223a (223b) and the recess-forming surfaces 224a toward the circumferential center of the two circumferentially adjacent recesses 224.

[0015] The stator core 200 is formed by assembling a first core member 210 and a second core member 220. Specifically, the radially outer ends of the teeth 211 (tooth bases 212) of the first core member 210 are press-fitted (or shrink-fitted or cold-fitted) into the recesses 224 of the second core member 220. This forms a stator core 200 having a yoke 221 that extends in the axial and circumferential directions, and a plurality of teeth 211 that are spaced apart in the circumferential direction on the radially inner side of the yoke 221 and also extend in the axial and radial directions. Furthermore, the tooth tip surface 214, which is formed radially inward of the tooth tip portion 213, creates a rotor insertion space into which the rotor (not shown in the figure) is inserted. One embodiment of the electric motor of the present invention is comprised of a stator 100 and a rotor rotatably arranged within a rotor insertion space.

[0016] An insulator is attached to each of the multiple teeth 211 of the stator core 200. An insulator 300 of one embodiment will be described with reference to Figures 5 to 10. Figure 5 is a perspective view of the insulator 300 as seen from the first flange portion 400 side, and Figure 6 is a perspective view of the insulator 300 as seen from the second flange portion 500 side. Figure 7 is a view of Figure 5 from the direction of arrow VII, Figure 8 is a view of Figure 5 from the direction of arrow VIII, and Figure 9 is a view of Figure 5 from the direction of arrow IX. Figure 10 is a cross-sectional view of Figure 7 as seen from the direction of line XX.

[0017] The insulator 300 is formed from a resin having insulating properties, such as polybutylene terephthalate (PBT) resin, polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP) resin, nylon, etc. Insulator 300 is sometimes called "electrical insulator," "insulating bobbin," "resin bobbin," or "coil bobbin," etc. The insulator 300 has a first flange portion 400, a second flange portion 500, and a body portion 600.

[0018] The first flange portion 400 extends in the axial direction (direction A) and the circumferential direction (direction B). The first flange portion 400 also has an outer peripheral surface 400A on the radially outward side (arrow C2 side), an inner peripheral surface 400B on the radially inward side (arrow C1 side), an end face 401 on one axial side (arrow A1 side), an end face 402 on the other axial side (arrow A2 side), a side surface 403 on one circumferential side (arrow B1 side), and a side surface 404 on the other circumferential side (arrow B2 side). The outer peripheral surface 400A extends in the axial and circumferential directions. In this embodiment, the outer circumferential surface 400A corresponds to the "first outer circumferential surface" of the present invention, and the inner circumferential surface 400B corresponds to the "first inner circumferential surface" of the present invention. Furthermore, the end face 401 corresponds to the "first end face" of the present invention, and the end face 402 corresponds to the "second end face" of the present invention. Furthermore, the side surface 403 corresponds to the "first side surface" of the present invention, and the side surface 404 corresponds to the "second side surface" of the present invention.

[0019] The second flange portion 500 is positioned radially inward (towards arrow C1) from the first flange portion 400 and extends in the axial direction (direction A) and the circumferential direction (direction B). The second flange portion 500 also has an outer peripheral surface 500A on the radially outward side (towards arrow C2), an inner peripheral surface 500B on the radially inward side (towards arrow C1), an end face 501 on one axial side (towards arrow A1), an end face 502 on the other axial side (towards arrow A2), a side surface 503 on one circumferential side (towards arrow B1), and a side surface 504 on the other circumferential side (towards arrow B2). The inner peripheral surface 500B extends in the axial and circumferential directions. In this embodiment, the outer circumferential surface 500A corresponds to the "second outer circumferential surface" of the present invention, and the inner circumferential surface 500B corresponds to the "second inner circumferential surface" of the present invention. Furthermore, the end face 501 corresponds to the "third end face" of the present invention, and the end face 502 corresponds to the "fourth end face" of the present invention. Furthermore, the side surface 503 corresponds to the "third side surface" of the present invention, and the side surface 504 corresponds to the "fourth side surface" of the present invention.

[0020] The body portion 600 is provided between the first flange portion 400 and the second flange portion 500 and extends radially. The body portion 600 also has a through hole 610 formed in its center, which opens to the outer circumferential surface 400A of the first flange portion 400 and the inner circumferential surface 500B of the second flange portion 500. The through hole 610 has an opening 610a on the outer circumferential surface 400A of the first flange portion 400 and an opening 610b on the inner circumferential surface 500B of the second flange portion 500. The through-hole 610 is formed by the inner wall surfaces 611 to 614. In this embodiment, as shown in Figure 11, the tooth base 212 is inserted into the through-hole 610 from the second flange 500 side (opening 610b side). At this time, the outer wall surfaces 212a to 212d of the tooth base 212 are inserted so as to face the inner wall surfaces 611 to 614 of the through-hole 610, respectively. In this embodiment, the inner wall surfaces 611 to 614 that form the through-hole 610 have inclined surfaces 611a to 614a on the inner circumferential surface 500B side (opening 610b side) of the second flange 500, respectively. This allows the tooth 211 (tooth base 212) to be easily inserted into the through-hole 610 of the insulator 300. The teeth 211 (tooth base 212) are inserted into the through hole 610 such that their radially outer ends protrude from the outer circumferential surface 400A of the first flange portion 400.

[0021] Furthermore, as shown in Figures 5 and 7, the first flange portion 400 has projections 410, 420, and 430 that protrude radially outward from the outer peripheral surface 400A. In this embodiment, projection 420 corresponds to the "third projection" of the present invention. Also, projection 430 corresponds to the "fourth projection" of the present invention.

[0022] The projection 410 is formed in the region on the other axial side (arrow A2 side) of the opening 610a of the through hole 610. The projection 410 has an outer wall surface 411 on the radially outward side, an outer wall surface 412 on one axial side, and an outer wall surface 413 on the other axial side. The outer wall surface 413 is formed as an inclined surface, with the distance from the outer peripheral surface 400A increasing as it moves from the end face 402 side toward the through hole 610 side. As described above, the radially outer end of the tooth 211 (tooth base 212) protruding from the outer peripheral surface 400A of the first flange portion 400 is press-fitted into the recess 224 of the second core member 220. The outer wall surface 413 of the projection 410 acts as a guide surface that guides the radially outer end of the tooth 211 into the recess 224.

[0023] The projection 420 is formed in a region on one axial side (arrow A1 side) and one circumferential side (arrow B1 side) of the opening 610a of the through hole 610. The projection 420 has an outer wall surface 421 on the radially outward side, an outer wall surface 422 on the other axial side, an outer wall surface 423 on one circumferential side, and an outer wall surface 424 on the other circumferential side. The outer wall surface on one axial side of the projection 420 is formed by the end face 401 of the first flange 400. The outer wall surface 423 has outer wall surface portions 423a to 423h. Outer wall surface portions 423b and 423c form a projection 420A that protrudes to one side in the circumferential direction. Outer wall surface portions 423e to 423g form a projection 420B that protrudes to the other side in the circumferential direction at a location on the other side in the axial direction from projection 420A. Outer wall surface portions 423a and 423b form a recess 420C that is recessed to the other side in the circumferential direction at a location on the one side in the axial direction from projection 420A.

[0024] The projection 430 is formed in the region on one axial side (arrow A1 side) and the other circumferential side (arrow B2 side) of the opening 610a of the through hole 610. The projection 430 has an outer wall surface 431 on the radially outward side, an outer wall surface 432 on the other axial side, an outer wall surface 433 on one circumferential side, and an outer wall surface 434 on the other circumferential side. The outer wall surface on one axial side of the projection 430 is formed by the end face 401 of the first flange 400. The outer wall surface 434 has outer wall surface portions 434a to 434e. Outer wall surface portions 434b to 434d form a projection 430A that protrudes to the other side in the circumferential direction. Furthermore, a projection 430B is formed on the outer wall surface portion 434a of the outer wall surface 434 of the projection 430, projecting to the other side in the circumferential direction. A projection 430C is formed on the projection 430B, projecting from the other end in the circumferential direction to the other side in the axial direction. The outer wall surface portions 434a and 434b of the projection 430, projection 430B, and projection 430C form a recess 420D that is recessed in one direction in the circumferential direction at a location on the other side of the projection 430.

[0025] Furthermore, the first flange portion 400 has recesses 450 and 460 that are recessed radially inward (towards arrow C1) from the outer peripheral surface 400A.

[0026] The recess 450 is located on one side in the circumferential direction (towards arrow B1) of the opening 610a of the through hole 610. The recess 450 is formed by a bottom surface 450a, a wall surface on one axial side, and a wall surface on the other circumferential side. That is, the recess 450 is open on the radially outward side (arrow C2 side), one circumferential side (arrow B1 side), and the other axial side (arrow A2 side). The bottom surface 450a of the recess 450 extends in the axial direction (direction A) and the circumferential direction (direction B). The wall surface on one axial side of the recess 450 is connected to the axial end of the bottom surface 450a and extends radially and circumferentially. In this embodiment, the wall surface on one axial side of the recess 450 is formed by the outer wall surface portion 423g of the outer wall surface 432 of the projection 420. The wall surface on the other circumferential side of the recess 450 is connected to the other circumferential end of the bottom surface 450a and extends in the axial and radial directions. In this embodiment, the wall surface on the other circumferential side of the recess 450 is formed by the wall surface 450b and the outer wall surface portion 423h of the outer wall surface 423 of the projection 420. In this embodiment, the bottom surface 450a is formed as a flat surface (including a "substantially flat surface"). Furthermore, the wall surface on one axial side and the wall surface on the other circumferential side of the recess 450 are formed to extend in a direction perpendicular to (including a "substantially perpendicular") the bottom surface 450a. Of course, the shape of the bottom surface 450a and the inclination angles of the wall surface on one axial side and the wall surface on the other circumferential side with respect to the bottom surface 450a are not limited to this.

[0027] The recess 460 is located on the other side in the circumferential direction (towards arrow B2) from the opening 610a of the through hole 610. The recess 460 is formed by a bottom surface 460a, a wall surface on one axial side, and a wall surface on one circumferential side. That is, the recess 460 is open on the radially outward side (arrow C2 side), the other circumferential side (arrow B2 side), and the other axial side (arrow A2 side). The bottom surface 460a of the recess 460 extends in the axial direction (direction A) and the circumferential direction (direction B). The wall surface on one axial side of the recess 460 is connected to the end on one axial side of the bottom surface 460a and extends radially and circumferentially. In this embodiment, the wall surface on one axial side of the recess 460 is formed by the outer wall surface portion 434d of the outer wall surface 434 of the projection 430. The wall surface on one circumferential side of the recess 460 is connected to the end on one circumferential side of the bottom surface 460a and extends in the axial and radial directions. In this embodiment, the wall surface on one circumferential side of the recess 460 is formed by the wall surface 460b and the outer wall surface portion 434e of the outer wall surface 434 of the projection 430. In this embodiment, the bottom surface 460a is formed as a flat surface (including a "substantially flat surface"). Furthermore, the wall surface on one axial side and the wall surface on one circumferential side of the recess 460 are formed to extend in a direction perpendicular to (including "substantially perpendicular") the bottom surface 460a. Of course, the shape of the bottom surface 460a and the inclination angles of the wall surface on one axial side and the wall surface on one circumferential side with respect to the bottom surface 460a are not limited to this.

[0028] In this embodiment, the recess 450 corresponds to the "first recess" of the present invention. The bottom surface 450a corresponds to the "first bottom surface" of the present invention. The outer wall surface portion 423g of the outer wall surface 423 of the projection 420 forms the "first wall surface" of the present invention. The wall surface 450b and the outer wall surface portion 423h of the outer wall surface 423 of the projection 420 form the "second wall surface" of the present invention. Furthermore, the recess 460 corresponds to the "second recess" of the present invention. The bottom surface 460a corresponds to the "second bottom surface" of the present invention. The outer wall surface portion 434d of the outer wall surface 434 of the projection 430 forms the "third wall surface" of the present invention. The wall surface 460b and the outer wall surface portion 434e of the outer wall surface 434 of the projection 430 form the "fourth wall surface" of the present invention.

[0029] Furthermore, the first flange portion 400 has a projection 403A protruding from the side surface 403 and a projection 404A protruding from the side surface 404. The projection 403A is formed on the side surface 403 at a location on the axial side of the opening 610a of the through hole 610, and protrudes from the side surface 403 to one side in the circumferential direction (arrow B1 side). On one side in the axial direction, the projection 403A has an end face 403a that is connected to the side surface 403 and extends in the radial direction (direction C) and the circumferential direction (direction B). The projection 404A is formed on the side surface 404 at a location on the axial side of the opening 610a of the through hole 610, and protrudes from the side surface 404 to the circumferential side (arrow B2 side). On one axial side, the projection 404A has an end face 404a that is connected to the side surface 404 and extends in the radial direction (direction C) and the circumferential direction (direction B). The protrusions 403A and 404A act as movement restricting portions that restrict the axial movement of the first and second ends of the insulating member 800, which will be described later. The end faces 403a and 404a also act as movement restricting surfaces that restrict the axial movement of the first end portion 810 and the second end portion 840 of the insulating member 800, which will be described later. In this embodiment, projection 403A corresponds to the "first projection" of the present invention, and end face 403a corresponds to the "end face formed on one axial side of the first projection" of the present invention. Furthermore, projection 404A corresponds to the "second projection" of the present invention, and end face 403a corresponds to the "end face formed on one axial side of the second projection" of the present invention.

[0030] The first flange portion 400 has a recess 401a formed on its end face 401, which is open on one side in the axial direction, the radially outward, and the radially inward. Furthermore, a hole 440 extending in the radial direction is formed between the protrusions 420 and 430.

[0031] Furthermore, as shown in Figures 6 and 8, the second flange portion 500 has a projection 510 that protrudes radially inward from the inner circumferential surface 500B. The projection 510 is formed on one axial side (arrow A1 side) of the opening 610b of the through hole 610 on the inner circumferential surface 500B. The projection 510 has an outer wall surface 511 on the radially outward side, an outer wall surface 512 on the other axial side, an outer wall surface 513 on one circumferential side, and an outer wall surface 514 on the other circumferential side. The outer wall surface on one axial side of the projection 510 is formed by the end face 501 of the second flange 500.

[0032] Furthermore, the second flange portion 500 has a projection 520 formed on its end face 501 that protrudes in one axial direction (towards arrow A1). In addition, a projection 530 is formed on the projection 520 that protrudes radially inward (towards arrow C1). In this embodiment, the projection 530 is formed on the projection 520 at the location on one axial direction. The projection 530 restricts the movement of the stator winding 700, which is wound around the projection 520, in one axial direction.

[0033] Furthermore, the second flange portion 500 has a projection 540 that protrudes radially inward (towards arrow C1) between the projection 530 and the opening 610b of the through hole 610. In this embodiment, the projection 540 is formed on one axial side (towards arrow A1) of the projection 510, extending in the circumferential direction (direction B) and the radial direction (direction C). Also in this embodiment, the projection 540 is formed flush with the end face 501 of the second flange portion 500. The projection 540 increases the dielectric strength between the stator winding 700 wrapped around the projection 520 and the teeth 211 inserted into the through hole 610 of the insulator 300. The position of the projection 540 can be changed as appropriate, as long as it is between the projection 530 and the opening 610b of the through hole 610. In this embodiment, projection 520 corresponds to the "fifth projection" of the present invention. Also, projection 530 corresponds to the "sixth projection" of the present invention. Furthermore, projection 540 corresponds to the "seventh projection" of the present invention.

[0034] The stator winding 700 is wound around the insulator 300, which is attached to the teeth 211. In other words, the stator winding 700 is wound around the teeth 211 using a concentrated winding method. Various methods can be used to wind the stator winding 700 around the insulator 300. For example, one method can be used in which the insulator 300 is attached to the teeth 211 with the stator winding 700 already wound around it. Alternatively, one method can be used in which the insulator 300 is attached to the teeth 211 with the stator winding 700 already wound around the insulator 300.

[0035] Next, we will explain the process of assembling the first core member 210 and the second core member 220. First, an insulator 300 is attached to the teeth 211 (tooth base 212) of the first core member 210. In this embodiment, as shown in Figure 11, the radially outer end of the tooth 211 is inserted into the through hole 610 of the insulator 300 from the second flange 500 side (opening 610b side). At this time, the tooth 211 is guided into the through hole 610 by the inclined surfaces 611a to 614a of the inner wall surfaces 611 to 614 that form the through hole 610. The tooth 211 is inserted such that its radially outer end protrudes from the outer peripheral surface 400A of the first flange 400.

[0036] Then, with the insulator 300 attached to the teeth 211 and the stator winding 700 wound around the insulator 300, the first core member 210 and the second core member 220 are assembled. In this embodiment, the radially outer end of the teeth 211, which protrudes from the outer peripheral surface 400A of the first flange portion 400, is press-fitted into the recess 224 formed in the yoke 221 of the second core member 220. At this time, the radially outer end of the tooth 211 moves axially within the recess 224 while being guided into the recess 224 by the outer wall surface 413 of the projection 410 formed on the other axial side of the opening 610a of the through hole 610. This prevents the first core member 210 or the insulator 300 from coming into contact with the second core member 220 with strong force. By preventing contact, deformation of the first core member 210 or the second core member 220, or crack formation in the insulator 300, can be prevented.

[0037] Furthermore, the radially outer end of the tooth 211 can be press-fitted into the recess 224 of the second core member 220 using a press-fitting jig. That is, the press-fitting jig applies a force to the outer wall surface 212a of the tooth 211 protruding from the outer peripheral surface 400A of the first flange portion 400, moving the radially outer end of the tooth 211 in a direction that inserts it into the recess 224. At this time, if the radially outer end of the tooth 211 bulges in the circumferential and radial directions due to the force applied by the press-fitting jig, the press-fitting operation becomes difficult. For this reason, it is necessary to use a press-fitting jig of the appropriate size and apply force to the appropriate location on the radially outer end of the tooth 211. In this embodiment, projections 420 and 430 are provided on the outer peripheral surface 400A of the first flange portion 400, on one axial side from the opening 610a of the through hole 610. The outer wall surface 424 on the other circumferential side of projection 420 and the outer wall surface 433 on one circumferential side of projection 430 form a movement path for the press-fitting jig. This prevents deformation of the radially outer end of the tooth 211, while allowing the radially outer end of the tooth 211 to be press-fitted into the recess 224 of the second core member 220.

[0038] The insulating member 800 insulates the stator winding 700, which is wrapped around the insulator 300 attached to the teeth 211, from the yoke 221 of the stator core 200. In this embodiment, the insulating member 800 is positioned between two circumferentially adjacent insulators 300 and the yoke 221 of the stator core 200, straddling the two insulators 300. The insulating member 800 is composed of an insulating film formed from a resin having insulating properties. Examples of resins with insulating properties include polyethylene terephthalate resin and polyethylene naphthalate resin. Furthermore, the insulating member only needs to be able to insulate the stator winding 700, which is wrapped around the insulator 300, from the yoke 221. In other words, the entire insulating member does not need to be placed between the insulator 300 and the yoke 221; it is sufficient if at least a portion of the insulating member is placed between the insulator 300 and the yoke 221.

[0039] An embodiment of the insulating member 800 will be described with reference to Figure 12. The insulating member 800 is formed by folding a rectangular insulating film having edges 800a to 800d. Edges 800a and 800b are formed on both sides in the circumferential direction and extend in the axial direction (direction A). Edges 800c and 800d are arranged on both sides in the axial direction and extend in the circumferential direction (direction B). The insulating film is divided into a first end portion 810, a first central portion 820, a second central portion 830, and a second end portion 840, which extend in the axial and circumferential directions, by fold lines 801 to 803 that extend in the axial direction. The first central portion 820 and the second central portion 830 are folded along the fold line 802. The folded first central portion 820 and the second central portion 830 form the central portion. Furthermore, the first end portion 810 and the second end portion 840 are folded along the fold lines 801 and 803. At this time, the first end portion 810 and the second end portion 840 are folded in directions away from each other. This forms an insulating member 800 having a central portion extending in the axial and radial directions, and first and second ends extending in the axial and circumferential directions, which are bent away from each other from the radially inner end of the central portion. The central portion of the insulating member 800 has a V-shaped cross-section. The insulating member 800 shown in Figure 12 has the same shape when viewed from one axial side (arrow A1 side) and when viewed from the other axial side (arrow A2 side). That is, it is possible to use it in a configuration where the first end portion 810 is positioned on one circumferential side and the second end portion 840 is positioned on the other circumferential side, or in a configuration where the second end portion 840 is positioned on one circumferential side and the first end portion 810 is positioned on the other circumferential side.

[0040] In this embodiment, the insulating member 800 corresponds to the "insulating member" of the present invention. Furthermore, the first central portion 820 and the second central portion 830 form the "central portion extending in the axial and radial directions" of the present invention. Furthermore, the first end portion 810 (or the second end portion 840) corresponds to the "first end portion extending in the axial and circumferential directions on one side in the circumferential direction" or the "first end portion extending in the axial and circumferential directions, connected to one end in the circumferential direction of the central portion" of the present invention. Furthermore, the second end portion 840 (or the first end portion 810) corresponds to the "second end portion extending in the axial and circumferential directions on the other side in the circumferential direction" or the "second end portion extending in the axial and circumferential directions, connected to the other end in the circumferential direction of the central portion" of the present invention.

[0041] Next, the operation of placing the insulating member 800 between two circumferentially adjacent insulators 300 and the yoke 221 of the stator core 200, straddling the two insulators 300, will be explained with reference to Figures 13 to 15. Figure 13 shows the state in which insulators 300 are attached to each of two teeth 211 that are adjacent in the circumferential direction. In the following, of the two insulators 300 that are adjacent in the circumferential direction, the insulator 300 located on one side in the circumferential direction (arrow B1 side) will be referred to as the "first insulator 300", and the insulator 300 located on the other side in the circumferential direction (arrow B2 side) will be referred to as the "second insulator 300".

[0042] Furthermore, when the first core member 210 and the second core member 220 are assembled, a gap is formed between the insulator 300 and the yoke 221, extending in the axial and circumferential directions. The gap formed between the insulator 300 and the yoke 221 includes a gap formed on one side in the circumferential direction (hereinafter referred to as the "first gap") and a gap formed on the other side in the circumferential direction (hereinafter referred to as the "second gap"). The first gap is formed between the outer peripheral surface 400A of the first flange portion 400, on one side in the circumferential direction from the opening 610a of the through hole 610 (the portion where the recess 450 is formed), and the inner peripheral surface 223 of the yoke 221. The second gap is formed between the outer peripheral surface 400A of the first flange portion 400, on the other side in the circumferential direction from the opening 610a of the through hole 610 (the portion where the recess 460 is formed), and the inner peripheral surface 223 of the yoke 221. Furthermore, when the first core member 210 and the second core member 220 are assembled, a gap 300a (see Figure 13) is formed between the first insulator 300 (side surface 404 of the first flange portion 400) and the second insulator 300 (side surface 403 of the first flange portion 400).

[0043] The first end of the insulating member 800, which extends axially and circumferentially and is connected to one circumferential end of the central part, is inserted into the second gap formed between the first insulator 300 and the yoke 221. The second end of the insulating member 800, which extends axially and circumferentially and is connected to the other circumferential end of the central part, is inserted into the first gap formed between the second insulator 300 and the yoke 211. The central part of the insulating member 800 is inserted into the gap 300a formed between the first insulator 300 and the second insulator 300. The insulating member 800 (first end, second end, and central part) enhances the dielectric strength between the stator winding 700 and the yoke 221, which are wrapped around the circumferentially adjacent first insulator 300 and second insulator 300, respectively. Furthermore, the central portion of the insulating member 800, which is inserted into the gap 300a, is positioned between the stator windings 700 that are wound around the first insulator 300 and the second insulator 300, respectively. Stator windings 700 of different phases are wound around the circumferentially adjacent first insulator 300 and second insulator 300, respectively. Therefore, the central portion of the insulating member 800 increases the dielectric strength between the stator windings 700 that are wrapped around the adjacent first insulator 300 and second insulator 300, respectively.

[0044] The first end of the insulating member 800 is positioned within a recess 460 formed in the first flange portion 400 of the first insulator 300. The second end of the insulating member 800 is positioned within a recess 450 formed in the first flange portion 400 of the second insulator 300. The recesses formed on both sides in the circumferential direction of the first flange portion of the insulator disclosed in Patent Documents 1 and 2 have wall surfaces on one axial side and the other axial side. Therefore, when inserting the first end of the insulating member 800 into the second gap formed between the first insulator and the yoke 221, and when inserting the second end of the insulating member 800 into the first gap formed between the second insulator and the yoke 221, it is necessary to tilt the insulating member 800. That is, the first end must be tilted with respect to the extending direction of the outer peripheral surface 400A of the first flange portion 400 of the first insulator 300, and the second end must be tilted with respect to the extending direction of the outer peripheral surface 400A of the first flange portion 400 of the second insulator 300.

[0045] On the other hand, in the insulator 300 of this embodiment, the recesses 450 and 460 formed on the outer peripheral surface 400A of the first flange portion 400 open to the other side in the axial direction. That is, the recess 450 has wall surfaces on one side in the axial direction and the other side in the circumferential direction, but does not have a wall surface on the other side in the axial direction. Similarly, the recess 460 has wall surfaces on one side in the axial direction and the other side in the circumferential direction, but does not have a wall surface on the other side in the axial direction. Therefore, when inserting the first end of the insulating member 800 into the second gap formed between the first insulator 300 and the yoke 221, and inserting the second end of the insulating member 800 into the first gap formed between the second insulator 300 and the yoke 221, it is not necessary to tilt the insulating member 800. That is, the first end of the insulating member 800 can be inserted into the second gap formed between the first insulator 300 and the yoke 221 parallel to (including "approximately parallel") the direction of extension of the bottom surface 460a that forms the recess 460 of the first insulator 300. Also, the second end of the insulating member 800 can be inserted into the first gap formed between the second insulator 300 and the yoke 221 parallel to (including "approximately parallel") the direction of extension of the bottom surface 450a that forms the recess 450 of the second insulator 300. The operation of inserting the central part of the insulating member 800 into the gap 300A is the same as when using the insulators disclosed in Patent Documents 1 and 2. Furthermore, when the insulating member 800 has its first end positioned in the recess 460 of the first insulator 300, its second end positioned in the recess 450 of the second insulator 300, and its central portion inserted into the gap 300a, movement in the other axial direction is prevented by elastic force. By using the insulator 300 of this embodiment, the insulating member 800 can be easily positioned in the recesses of the two insulators attached to adjacent teeth 211 (in this embodiment, in the recess 460 of the first insulator 300 and in the recess 450 of the second insulator 300).

[0046] As shown in Figure 14, the insulating member 800 is inserted from the other axial side into the gap between the circumferentially adjacent first insulator 300 and second insulator 300 and the yoke 211, and into the gap 300a between the first insulator 300 and the second insulator 300. In Figure 14, the insulating member 800 is inserted from the edge 800c side. In this case, the first end portion 810 of the insulating member 800 corresponds to the "first end connected to one circumferential end of the central portion," and the second end portion 840 of the insulating member 800 corresponds to the "second end connected to the other circumferential end of the central portion." As mentioned above, the shape of the insulating member 800 is the same when viewed from one axial side and when viewed from the other axial side. For this reason, the insulating member 800 can also be inserted from the edge portion 800d side. In this case, the second end portion 840 of the insulating member 800 corresponds to the "first end portion connected to one circumferential end of the central portion," and the first end portion 810 of the insulating member 800 corresponds to the "second end portion connected to the other circumferential end of the central portion."

[0047] Figure 15 shows an insulating member 800 positioned between two circumferentially adjacent insulators 300 and the yoke 211 of the stator core 200, straddling the two insulators 300. In Figure 15, the insulating member 800 has its first end portion 810 positioned within the recess 460 of the first insulator 300, its second end portion 840 positioned within the recess 450 of the second insulator 300, and its central portion (first central portion 820, second central portion 830) inserted into the gap 300a between the first insulator 300 and the second insulator 300.

[0048] Here, there is a risk that the insulating member 800 may move in the other axial direction due to some external force. If the insulating member 800 moves in the other axial direction, there is a risk that its insulating properties will deteriorate. As described above, the insulator 300 of this embodiment has a projection 403A formed on the side surface 403 of the first flange portion 400 that protrudes to one side in the circumferential direction, and a projection 404A formed on the side surface 404 of the first flange portion 400 that protrudes to the other side in the circumferential direction. In addition, end faces 403a and 404a extending in the circumferential and radial directions are formed on one side in the axial direction of the projections 403A and 404A. The insulating member 800 is inserted into the gap including the first gap and the second gap until its edge portion 800d is positioned axially to one side of the projections 403A and 404A. In this state, the portion of the edge portion 800d corresponding to the connection between the first end portion 810 and the first central portion 820 is positioned axially to one side of the projection 403A. Also, the portion of the edge portion 800d corresponding to the connection between the second central portion 830 and the second end portion 840 is positioned axially to one side of the projection 404A. In this state, if the insulating member 800 moves to the other axial direction, the first central portion 820 will come into contact with the end face 403a of the projection 403A, or the second central portion 830 will come into contact with the end face 404a of the projection 404A. This restricts the movement of the insulating member 800 to the other axial direction.

[0049] Next, the method for securing the ends of the stator winding 700 will be explained with reference to Figure 13. As shown in Figure 13, when the insulators 300 are attached to circumferentially adjacent teeth 211, the protrusion 430B of the first insulator 300 is positioned within the recess 420C of the second insulator 300. This creates a working space between the protrusions 430A and 430B of the first insulator 300 and the protrusion 420A of the second insulator 300. This workspace makes it easy to tie and secure the end of the stator winding 700, which is wrapped around the insulator 300, to the projection 430B of the first insulator 300 with the string 710. At this time, the projection 430C formed on the projection 430B of the first insulator 300 prevents the string 710 from coming loose.

[0050] In addition, the end of the stator winding 700, which is wrapped around the insulator 300, may be wrapped around a projection 520 (see Figure 6) of the insulator 300. The end of the stator winding 700, which is wrapped around the projection 520, is restricted from moving in one axial direction by the projection 530. In this case, there is a risk of dielectric breakdown between the end of the stator winding 700, which is wrapped around the protrusion 520, and the teeth 211, which are inserted into the through-hole 610 of the insulator 300. In the insulator 300 of this embodiment, as described above, a projection 540 is formed between the opening 610b of the through hole 610 and the projection 530, projecting radially inward (towards arrow C1) from the inner circumferential surface 500B of the second flange 500. In this embodiment, the projection 540 extends in both the circumferential and radial directions. This increases the dielectric strength between the end of the stator winding 700, which is wrapped around the protrusion 520, and the teeth 211, which are inserted into the through-hole 610 of the insulator 300. The projection 530 can be omitted. In this case, the projection 540 is formed between the opening 610b of the through hole 610 and the end face 501 of the second flange 500.

[0051] In the above embodiments, an insulating member 800 bent into a V-shape was used, but the shape of the insulating member is not limited to this. The case using a flat plate-shaped insulating member 900 will be explained with reference to Figure 16. The insulating member 900 is formed from a rectangular insulating film having edges 900a to 900d. Edges 900a and 900b are formed on both sides in the circumferential direction and extend in the axial direction (direction A). Edges 900c and 900d are arranged on both sides in the axial direction and extend in the circumferential direction (direction B). The insulating member 900 has a first end portion 910 and a second end portion 930 extending in the axial and circumferential directions on both sides in the circumferential direction, and a central portion 920 in the center. Similar to the insulating member 800, the insulating member 900 has the same shape when viewed from one axial side (arrow A1 side) and when viewed from the other axial side (arrow A2 side). That is, it is possible to use it in a configuration where the first end portion 910 is positioned on one circumferential side and the second end portion 930 is positioned on the other circumferential side, or in a configuration where the second end portion 930 is positioned on one circumferential side and the first end portion 910 is positioned on the other circumferential side.

[0052] The operation of placing the insulating member 900 between two circumferentially adjacent insulators 300 and the yoke 221 of the stator core 200, straddling the two insulators 300, is the same as the operation of placing the insulating member 800, except for the operation of inserting the central part of the insulating member 800 into the gap 300a. In other words, the first end portion (910 or 930) of the insulating member 900 is inserted into the second gap formed between the first insulator 300 and the yoke 221, and the second end portion (930 or 910) of the insulating member 900 is inserted into the first gap formed between the second insulator 300 and the yoke 221. At this time, it is not necessary to tilt the insulating member 900, as is the case when using the insulators disclosed in Patent Documents 1 and 2. That is, the first end portion (910 or 930) of the insulating member 900 can be inserted into the second gap formed between the first insulator 300 and the yoke 221 parallel to (including "approximately parallel") the direction in which the bottom surface 460a forming the recess 460 of the first insulator 300 extends. Furthermore, the second end portion (930 or 910) of the insulating member 900 can be inserted into the first gap formed between the second insulator 300 and the yoke 221, parallel to (including "approximately parallel to") the direction in which the bottom surface 450a forming the recess 450 of the second insulator 300 extends.

[0053] In this embodiment, the insulating member 900 corresponds to the "insulating member" of the present invention. Furthermore, the first end portion 910 (or the second end portion 930) corresponds to the "first end portion extending axially and circumferentially on one side in the circumferential direction" of the present invention, the second end portion 930 (or the first end portion 910) corresponds to the "second end portion extending axially and circumferentially on the other side in the circumferential direction" of the present invention, and the central portion 920 corresponds to the "central portion extending axially and circumferentially in the center" of the present invention.

[0054] The present invention is not limited to the configuration described in the embodiments, and various modifications, additions, and deletions are possible. The shape of the first projection formed on the first side surface of the first flange portion and the shape of the end face formed on one axial side of the first projection, the shape of the second projection formed on the second side surface of the first flange portion and the shape of the end face formed on one axial side of the second projection can be changed as appropriate. A first projection is formed on the first side surface of the first flange, and an end face is formed on one axial side of the first projection. A second projection is formed on the second side surface of the first flange, and an end face is formed on one axial side of the second projection. However, the end faces of the first projection and the second projection can be omitted. Furthermore, the first projection and the second projection can also be omitted. The present invention can be configured as an insulator, a stator, or an electric motor. The shape and number of segmented core members that make up the stator core can be changed as appropriate. The shape of the insulator can be changed as needed. Various shapes of insulating materials can be used, such as V-shaped, U-shaped, and flat plates. Each configuration described in each embodiment can be used individually, or multiple configurations can be used in combination as appropriate. The electric motor of the present invention can be used as a drive motor to drive various devices such as compressors (compression mechanisms), vehicles, and in-vehicle equipment. The numbers of each projection shown in the embodiment (e.g., 1st, 2nd, etc.) can be changed as appropriate. [Explanation of Symbols]

[0055] 100 stator 200 stator core 200A, 200B stator core end face 210 First core member 211 Teeth 212 Teeth base 212a~212d Exterior wall surface 213 Tooth tip 214 Tooth tip surface 215 Connection section 216, 226 Crimping protrusions 220 Second core member 221 York 222 Outer surface of the yoke 223 Inner surface of the yoke 223a, 223b Inner circumferential surface of the yoke 224 recess 224a Recess-forming surface 300 Insulator 300a gap 400 First guard section 400A outer surface 400B Inner surface 401, 402 end face 401a Recess 403, 404 Side view 403A, 404A protrusion 403a, 404a end face 410, 420, 420A, 420B, 430, 430A, 430B, 430C protrusion 411-413, 421-424, 431-434 Exterior wall surface 423a~423h, 434a~434e External wall part 420C, 430D recess 440 holes 450, 460 recess 450a, 460a bottom 450b, 460b wall 500 Second guard section 500A outer surface 500B Inner surface 501, 502 end face 503, 504 Side view 510, 520, 530, 540 protrusions 511-514 Exterior wall surface 600 Torso 610 Through hole 610a, 610b opening 611, 612, 613, 614 Interior wall surface 611a, 612a, 613a, 614a Slope 700 Stator winding 710 string 800, 900 Insulating material 800a~800d, 900a~900d edge 801, 802, 803 Folding lines 810, 840, 910, 930 end part 820, 830, 920 central part

Claims

1. An insulator provided spaced apart in the circumferential direction and attached to each of a plurality of teeth extending in the axial and radial directions, It has a first flange portion extending in the axial and circumferential directions, a second flange portion positioned radially inward from the first flange portion and extending in the axial and circumferential directions, and a body portion provided between the first flange portion and the second flange portion and extending in the radial direction, The first flange portion has a first outer peripheral surface on the radially outward side, a first inner peripheral surface on the radially inward side, a first side surface on one side in the circumferential direction, a second side surface on the other side in the circumferential direction, a first end surface on one side in the axial direction, and a second end surface on the other side in the axial direction. The second flange portion has a second outer peripheral surface on the radially outward side, a second inner peripheral surface on the radially inward side, a third side surface on one side in the circumferential direction, a fourth side surface on the other side in the circumferential direction, a third end surface on one side in the axial direction, and a fourth end surface on the other side in the axial direction. The body portion has through holes opening to the first outer surface of the first flange portion and the second inner surface of the second flange portion. The first flange portion has a first recess and a second recess formed on the first outer peripheral surface, which are recessed radially inward on one side and the other side of the through hole in the circumferential direction. The first recess is formed by a first bottom surface extending in the axial and circumferential directions, a first wall surface connected to one end of the first bottom surface on the axial side and extending in the circumferential and radial directions, and a second wall surface connected to the other end of the first bottom surface on the circumferential side and extending in the axial and radial directions, and extends in the axial and circumferential directions, and is open on the radially outer side, one side on the circumferential side and the other side on the axial direction. The second recess is formed by a second bottom surface extending in the axial direction and the circumferential direction, a third wall surface connected to one end of the second bottom surface on the axial side and extending in the circumferential direction and the radial direction, and a fourth wall surface connected to one end of the second bottom surface on the circumferential side and extending in the axial direction and the radial direction, and is characterized in that it extends in the axial direction and the circumferential direction and is open on the radially outer side, the other circumferential side and the other axial side.

2. An insulator according to claim 1, The insulator is characterized in that the first flange portion has a first projection formed on the first side surface at a location on the other axial side of the through hole, projecting to one side in the circumferential direction, and a second projection formed on the second side surface at a location on the other axial side of the through hole, projecting to the other side in the circumferential direction.

3. The insulator according to claim 2, The first projection has an end face that is connected to the first side surface on one side in the axial direction and extends in the radial and circumferential directions. The insulator is characterized in that the second projection has an end face formed on one side in the axial direction, connected to the second side surface, and extending in the radial and circumferential directions.

4. An insulator according to any one of claims 1 to 3, The first flange portion has a third projection that protrudes radially outward in a region on the first outer surface that is on one side in the circumferential direction and one side in the axial direction from the through hole, and a fourth projection that protrudes radially outward in a region on the first outer surface that is on the other side in the circumferential direction and one side in the axial direction from the through hole. At least a portion of the first wall surface and the second wall surface of the first recess is formed by the outer wall surface of the third projection, An insulator characterized in that at least a portion of the third wall surface and the fourth wall surface of the second recess is formed by the outer wall surface of the fourth projection.

5. An insulator according to any one of claims 1 to 4, The second flange portion has a fifth projection that protrudes from the third end face toward one side in the axial direction, The fifth projection has a sixth projection that protrudes radially inward, Furthermore, the insulator is characterized in that the second flange portion has a seventh projection that protrudes radially inward from the second inner circumferential surface of the second flange portion and extends radially and circumferentially between the through hole and the sixth projection.

6. It comprises a stator core, multiple insulators, stator windings, and multiple insulating members, The stator core comprises a yoke extending in the axial and circumferential directions, and a plurality of teeth provided radially inward of the yoke and spaced apart in the circumferential direction, extending in the axial and radial directions. Each of the aforementioned insulators is attached to each of the aforementioned teeth, The stator winding is wound around each of the insulators, Each of the insulating members is a stator positioned between two circumferentially adjacent insulators and the yoke of the stator core, straddling the two insulators. As the insulator, the insulator described in any one of claims 1 to 5 is used. The insulating member has a first end on one side in the circumferential direction that extends in the axial direction and in the circumferential direction, and a second end on the other side in the circumferential direction that extends in the axial direction and in the circumferential direction. A stator characterized in that the first end of the insulating member is positioned in the second recess formed in the first flange of the insulator located on one side in the circumferential direction of the two insulators, and the second end of the insulating member is positioned in the first recess formed in the first flange of the insulator located on the other side in the circumferential direction of the two insulators.

7. A stator according to claim 6, The insulating member has a central portion between the first end and the second end that extends in the axial direction and the radial direction, The stator is characterized in that the central portion of the insulating member is positioned between the second side surface of the first flange of the insulator arranged on one side in the circumferential direction and the first side surface of the first flange of the insulator arranged on the other side in the circumferential direction.

8. A stator according to claim 6 or 7, The stator core is characterized by comprising a first core member having a plurality of teeth and a second core member having a yoke.

9. An electric motor comprising a stator and a rotor rotatable relative to the stator, An electric motor characterized in that the stator is the one described in any one of claims 6 to 8.

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