Stator and rotary electric machine

Abstract

A stator (10) equipped with a stator core (24) having a plurality of radially extending teeth parts (22), a plurality of insulators (16) attached to the plurality of teeth parts, and a plurality of coil winding parts (18) wound around the plurality of teeth parts with an insulator interposed therebetween, wherein: the insulators have a pair of insulating parts (32, 330, 350, 380, 400) that extend in the axial direction of the stator core and are disposed on both sides of the teeth parts in the tangential direction of the stator core; and gas layers (50, 52, 170, 270, 338, 358, 388, 408) and the insulating parts are provided between the coil winding parts and the teeth parts in the tangential direction of the stator core.

Description

Stator and rotating electric machine CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application Nos. 2024-019751 filed on February 13, 2024, 2024-019752 filed on February 13, 2024, and 2024-195492 filed on November 7, 2024, the entire contents of which are incorporated herein by reference.

[0002] The technology of the present disclosure relates to a stator and a rotating electric machine.

[0003] The stator includes a stator core having a plurality of radially extending teeth, an insulator attached to the stator core, and a plurality of windings wound around the plurality of teeth via the insulator. Some stators of this type have an insulator attached to the axial end faces of the teeth and insulating paper provided on the side faces of the teeth (see, for example, JP 2018-198515 A).

[0004] As a result of detailed investigations by the inventors, the following problem was discovered: In a stator having the above configuration, there is a concern that dielectric breakdown may occur in the insulating paper when a high voltage is applied to the winding portion. To prevent this, it is conceivable to use an insulator that is thicker than the insulating paper instead of the insulating paper, but this would reduce the space factor of the winding portion.

[0005] The technique of the present disclosure aims to provide a stator and a rotating electric machine that can ensure insulation for a winding winding portion without reducing the space factor of the winding winding portion.

[0006] A first aspect of the technology of the present disclosure is a stator comprising a stator core having a plurality of radially extending tooth portions, a plurality of insulators attached to the plurality of tooth portions, and a plurality of winding winding portions wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer and the insulating portions are provided between the tooth portions and the winding winding portions in the tangential direction of the stator core.

[0007] A second aspect of the technology of the present disclosure is a stator comprising: a stator core having a plurality of radially extending tooth portions; a plurality of insulators attached to the plurality of tooth portions; and a plurality of winding winding portions wound around the plurality of tooth portions via the insulators, wherein the insulator is divided into a first insulator and a second insulator by a dividing portion, the first insulator and the second insulator have an overlap structure in which a first overlap portion formed on the first insulator and a second overlap portion formed on the second insulator overlap, and the dividing portion is formed between the first overlap portion and the second overlap portion.

[0008] A third aspect of the technology of the present disclosure is a stator comprising a stator core having a plurality of radially extending tooth portions, a plurality of insulators attached to the plurality of tooth portions, and a plurality of winding winding portions wound around the plurality of tooth portions via the insulators, wherein the insulators are divided into a first insulator and a second insulator by a dividing portion, and the first insulator and the second insulator are in close contact with each other at the dividing portion.

[0009] A fourth aspect of the technology of the present disclosure is a stator comprising a stator core having a plurality of radially extending tooth portions, a plurality of insulators attached to the plurality of tooth portions, and a plurality of winding winding portions wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer is provided between the tooth portions and the insulating portions in the tangential direction of the stator core.

[0010] A fifth aspect of the technology of the present disclosure is a stator comprising a stator core having a plurality of radially extending tooth portions, a plurality of insulators attached to the plurality of tooth portions, and a plurality of winding winding portions wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of first insulating portions arranged on both sides of the tooth portions in a tangential direction of the stator core, and a first gas layer is provided between the winding winding portions and the first insulating portions in the tangential direction of the stator core.

[0011] A sixth aspect of the technique of the present disclosure is a rotating electric machine including the stator according to any one of the first to fifth aspects, and a rotor rotatably arranged inside the stator.

[0012] FIG. 1 is a plan view of a stator according to the first embodiment. FIG. 2 is a perspective view of a stator component according to the first embodiment. FIG. 3 is a perspective view of a core member and an insulator according to the first embodiment. FIG. 4 is an exploded perspective view of a core member and an insulator according to the first embodiment. FIG. 5 is an enlarged longitudinal sectional view of a main portion of the stator component according to the first embodiment. FIG. 6 is an enlarged longitudinal sectional view of a main portion showing a modified example of the stator component according to the first embodiment. FIG. 7 is an enlarged longitudinal sectional view of a main portion of a stator component according to the second embodiment. FIG. 8 is an enlarged longitudinal sectional view of a main portion showing a modified example of the stator component according to the second embodiment. FIG. 9 is an exploded perspective view of a core member and an insulator according to the third embodiment. FIG. 10 is an exploded perspective view of a core member and an insulator according to the fourth embodiment. FIG. 11 is an enlarged longitudinal sectional view of a main portion of a stator component according to the fifth embodiment. FIG. 12 is an exploded perspective view of a core member and an insulator according to the sixth embodiment. FIG. 13 is an enlarged longitudinal sectional view of a main portion of a stator component according to the sixth embodiment. FIG. 14 is an enlarged longitudinal sectional view of a main portion showing a first modified example of the stator component according to the sixth embodiment. FIG. 15 is an enlarged longitudinal sectional view of a main portion showing a first modified example of the stator component according to the sixth embodiment. 22. An enlarged longitudinal sectional view of a main portion of a stator component according to a seventh embodiment, showing a second modified example of the stator component according to the seventh embodiment. An exploded perspective view of a core member and an insulator according to the eighth embodiment. An enlarged longitudinal sectional view of a main portion of a stator component according to the ninth embodiment. A cross-sectional view taken along line A-A in FIG. 20. An enlarged longitudinal sectional view of a main portion of a first modified example of the stator component according to the ninth embodiment. A cross-sectional view taken along line B-B in FIG. 22. An enlarged longitudinal sectional view of a main portion of a stator component according to a second modified example of the ninth embodiment. An enlarged longitudinal sectional view of a main portion of a stator component according to a tenth embodiment. An enlarged longitudinal sectional view of a main portion of a first modified example of the stator component according to the tenth embodiment. An enlarged longitudinal sectional view of a main portion of a second modified example of the stator component according to the tenth embodiment. An exploded perspective view of a core member and an insulator according to an eleventh embodiment. An enlarged longitudinal sectional view of a main portion of a stator component according to the eleventh embodiment. An enlarged longitudinal sectional view of a main portion of a first modified example of the stator component according to the eleventh embodiment. An enlarged longitudinal sectional view of a main portion of a second modified example of the stator component according to the eleventh embodiment.12. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the twelfth embodiment. An enlarged longitudinal cross-sectional view of a main portion showing a first modified example of the stator component according to the twelfth embodiment. An enlarged longitudinal cross-sectional view of a main portion showing a second modified example of the stator component according to the twelfth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the thirteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the fourteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the fourteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the fifteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the fifteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a first modified example of the stator component according to the fifteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a stator component according to the fifteenth embodiment. An enlarged longitudinal cross-sectional view of a main portion of a second modified example of the stator component according to the fifteenth embodiment. A plan view of a stator according to the sixteenth embodiment. A perspective view of a stator component according to the sixteenth embodiment. A perspective view of a core member and an insulator according to the sixteenth embodiment. An exploded perspective view of a core member and an insulator according to the sixteenth embodiment. A longitudinal cross-sectional view of a stator component according to the sixteenth embodiment. A longitudinal cross-sectional view of a first modified example of the stator component according to the sixteenth embodiment. 16. A longitudinal sectional view showing a second modified example of the stator component according to the sixteenth embodiment. A perspective view of a stator component according to the seventeenth embodiment. A perspective view of a core member and an insulator according to the seventeenth embodiment. An exploded perspective view of a core member and an insulator according to the seventeenth embodiment. A plan view of a core member according to the seventeenth embodiment. A longitudinal sectional view of a stator component according to the seventeenth embodiment. A longitudinal sectional view showing a modified example of the stator component according to the seventeenth embodiment. A perspective view of a stator component according to the eighteenth embodiment. A perspective view of a core member and an insulator according to the eighteenth embodiment. An exploded perspective view of a core member and an insulator according to the eighteenth embodiment. A longitudinal sectional view showing a first modified example of the stator component according to the eighteenth embodiment. A longitudinal sectional view showing a second modified example of the stator component according to the eighteenth embodiment. A longitudinal sectional view showing a third modified example of the stator component according to the eighteenth embodiment. A perspective view of a stator component according to the nineteenth embodiment. A perspective view of a core member and an insulator according to the nineteenth embodiment.FIG. 20 is an exploded perspective view of a core member and an insulator according to the 19th embodiment. FIG. 21 is a longitudinal cross-sectional view of a stator component according to the 19th embodiment. FIG. 22 is a perspective view showing a modified example of the stator component according to the 19th embodiment. FIG. 23 is a perspective view showing a modified example of the core member and an insulator according to the 19th embodiment. FIG. 24 is an exploded perspective view showing a modified example of the core member and an insulator according to the 19th embodiment. FIG. 25 is a longitudinal cross-sectional view of a stator component according to the 20th embodiment. FIG. 26 is a longitudinal cross-sectional view showing a modified example of the stator component according to the 20th embodiment.

[0013] First Embodiment First, a first embodiment of the technology of the present disclosure will be described.

[0014] 1, the rotating electric machine M includes a stator 10 and a rotor 11. The stator 10 is formed in an annular shape, and the rotor 11 is rotatably housed inside the stator 10. The stator 10 and the rotor 11 constitute an inner rotor type brushless motor.

[0015] The stator 10 includes a plurality of stator components 12. The stator 10 is configured by combining a plurality of stator components 12 in an annular shape. FIG. 1 shows the configuration of half of the stator 10. The stator 10 is applied to a brushless motor. Brushless motors may be used for any purpose. Examples of brushless motors include fan motors, pump drive motors, and compressor motors.

[0016] In each figure, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. In the following description, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24, which will be described later, are the same directions as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0017] 2 to 4 , each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 is formed in a T-shape in a plan view and has a core back portion 20 and teeth portions 22. The core back portion 20 extends in the circumferential direction of the stator core 24, and the teeth portions 22 extend inward in the Y direction from the center of the core back portion 20. The tip portions of the teeth portions 22 are free ends, and the base ends of the teeth portions 22 are connected to the core back portion 20.

[0018] A stator core 24 (see FIG. 1) is formed by combining a plurality of core members 14 in an annular shape. When the stator core 24 is formed, the plurality of core back portions 20 form an annular portion 26 (see FIG. 1) that is the outer periphery of the stator core 24, and the plurality of teeth portions 22 extend radially from the center of the stator core 24. Slots 28 are formed between the plurality of teeth portions 22.

[0019] The insulators 16 are attached to the core member 14. Specifically, the insulators 16 are attached to the tooth portions 22 so as to surround the tooth portions 22 in the Y direction. The insulators 16 are made of resin. Examples of resins that can be used to form the insulators 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). The resin that can be used to form the insulators 16 may be any resin.

[0020] The winding portion 18 is wound around the tooth portion 22 via the insulator 16. The winding portion 18 is formed by winding a wire around the tooth portion 22 in the Y direction.

[0021] The insulator 16 has a pair of first insulating portions 30 and a pair of second insulating portions 32. The pair of first insulating portions 30 each extend in the X direction. The pair of first insulating portions 30 are arranged on both sides of the tooth portion 22 in the Z direction, and each cover an end face 22A of the tooth portion 22 on both sides in the Z direction. The pair of second insulating portions 32 each extend in the Z direction. The pair of second insulating portions 32 are arranged on both sides of the tooth portion 22 in the X direction, and each cover a side face 22B of the tooth portion 22 on both sides in the X direction.

[0022] The insulator 16 is divided in the Z direction into a first insulator 42 and a second insulator 44 by a dividing portion 40. The dividing portion 40 refers to the boundary between the first insulator 42 and the second insulator 44. In other words, the dividing portion 40 corresponds to the dividing line formed between the first insulator 42 and the second insulator 44. The dividing portion 40 is formed in the center of each second insulating portion 32 in the Z direction. Each second insulating portion 32 is divided in the Z direction by the dividing portion 40 into an upper second insulating portion 32A and a lower second insulating portion 32B. Note that the terms "upper side" and "lower side" of the upper second insulating portion 32A and the lower second insulating portion 32B are used for convenience and do not limit the up-down direction of the stator 10.

[0023] The insulators 16 and the teeth 22 are configured to be plane-symmetrical in the X direction. Below, the configuration of the insulators 16 and the teeth 22 on one side in the X direction will be described, and a description of the configuration on the other side in the X direction will be omitted. In the following description, the X1 side indicates one side in the tangential direction of the stator core 24, the X2 side indicates the other side in the tangential direction of the stator core 24, the Z1 side indicates one side in the axial direction of the stator core 24, and the Z2 side indicates the other side in the tangential direction of the stator core 24.

[0024] 5 , the second insulating portion 32 has a first groove 46 and a second groove 48 that open toward the teeth 22. Between the second insulating portion 32 and the teeth 22, a first gas layer 50 is provided by the first groove 46, and a second gas layer 52 is provided by the second groove 48. The first gas layer 50 is provided between the upper second insulating portion 32A and the teeth 22 in the X direction, and the second gas layer 52 is provided between the lower second insulating portion 32B and the teeth 22 in the X direction. The first gas layer 50 and the second gas layer 52 are provided side by side in the Z direction. The first gas layer 50 and the second gas layer 52 are examples of the "gas layer" and the "third gas layer" in the technology of the present disclosure.

[0025] In the second insulating portion 32, a resin portion 54 is formed between the first gas layer 50 and the second gas layer 52, rather than a gas layer. The resin portion 54 is formed as a contact portion that contacts the side surface 22B of the tooth portion 22. The dividing portion 40 is formed in the resin portion 54. The dividing portion 40 is connected to the first gas layer 50 of the first gas layer 50 and the second gas layer 52. Note that the dividing portion 40 may also be connected to the second gas layer 52 of the first gas layer 50 and the second gas layer 52.

[0026] More specifically, the resin portion 54 has an overlap structure. The overlap structure is composed of a first overlap portion 56 formed on the upper second insulating portion 32A and a second overlap portion 58 formed on the lower second insulating portion 32B. The first overlap portion 56 extends toward the Z2 side, and the second overlap portion 58 extends toward the Z1 side. The dividing portion 40 is formed between the first overlap portion 56 and the second overlap portion 58.

[0027] The first overlap portion 56 is located on the winding portion 18 side (X1 side) of the second overlap portion 58 and abuts against the winding portion 18. The second overlap portion 58 is located on the tooth portion 22 side (X2 side) of the first overlap portion 56 and abuts against the side surface 22B of the tooth portion 22.

[0028] The lower second insulating portion 32B has a second overlap portion 58 and a main body portion 60. The main body portion 60 is located on the X1 side and the Z2 side of the second overlap portion 58, and is aligned with the first overlap portion 56 in the Z direction with a gap 62 interposed therebetween.

[0029] The upper second insulating portion 32A has a first dividing surface 64 that forms the dividing portion 40, and the lower second insulating portion 32B has a second dividing surface 66 that forms the dividing portion 40. The boundary between the first dividing surface 64 and the second dividing surface 66 is the dividing portion 40. The first dividing surface 64 has an axial dividing surface 64A that extends in the Z direction and a tangential dividing surface 64B that extends in the X direction. The second dividing surface 66 has an axial dividing surface 66A that extends in the Z direction and a tangential dividing surface 66B that extends in the X direction.

[0030] The axial dividing surface 64A and the axial dividing surface 66A divide the upper second insulating portion 32A and the lower second insulating portion 32B in the X direction, and the tangential dividing surface 64B and the tangential dividing surface 66B divide the upper second insulating portion 32A and the lower second insulating portion 32B in the Z direction. The axial dividing surface 64A and the axial dividing surface 66A may be in contact with each other or may be separated by a gap. The tangential dividing surface 64B and the tangential dividing surface 66B are separated by a gap 62 but may be in contact with each other.

[0031] In this way, when the first gas layer 50 is provided between the upper second insulating portion 32A and the teeth 22 and the second gas layer 52 is provided between the lower second insulating portion 32B and the teeth 22, insulation from the winding winding portion 18 can be ensured without increasing the thickness of the second insulating portion 32, compared to when the first gas layer 50 and the second gas layer 52 are not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to when the second insulating portion 32 is thickened. Furthermore, because the space factor of the winding winding portion 18 does not need to be reduced, an increase in the size of the stator 10 can be suppressed.

[0032] Furthermore, a resin portion 54, rather than a gas layer, is formed between the first gas layer 50 and the second gas layer 52 in the second insulating portion 32. The resin portion 54 has an overlap structure in which a first overlap portion 56 formed in the upper second insulating portion 32A overlaps a second overlap portion 58 formed in the lower second insulating portion 32B. The dividing portion 40 is formed to pass between the first overlap portion 56 and the second overlap portion 58. Therefore, since the dividing portion 40 passes between the first overlap portion 56 and the second overlap portion 58, the creepage distance L defined by the dividing portion 40 can be ensured to be long, and the insulating properties of the dividing portion 40 can also be ensured. As a result, for example, compared to a case in which the overlap structure is not provided, the size of the stator 10 can be suppressed from increasing while ensuring the insulating properties of the winding winding portion 18.

[0033] Furthermore, the dividing portion 40 is connected to the first gas layer 50. Therefore, the first gas layer 50 is present on the creepage distance L, and therefore, the insulation can be improved compared to when the first gas layer 50 is not present.

[0034] Furthermore, the main body 60 of the lower second insulating portion 32B is aligned in the Z direction with the first overlap portion 56 via a gap 62. Therefore, the gap 62 can improve the insulation properties of the dividing portion 40.

[0035] Furthermore, the resin portion 54 abuts against the side surface 22B of the tooth portion 22. This prevents the second insulating portion 32 from bending toward the tooth portion 22 due to the tightening force of the winding portion 18. This prevents the widths of the first gas layer 50 and the second gas layer 52 in the Z direction from decreasing.

[0036] 6, a gap 68 may be provided between the first overlap portion 56 and the winding winding portion 18 in the X direction. With this configuration, the provision of the gap 68 can improve the insulation with respect to the winding winding portion 18.

[0037] In addition, the first overlap portion 56 is located on the winding winding portion 18 side (X1 side) relative to the second overlap portion 58, but the second overlap portion 58 may be located on the winding winding portion 18 side (X1 side) relative to the first overlap portion 56.

[0038] Second Embodiment Next, a second embodiment of the technique of the present disclosure will be described.

[0039] In the second embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in Fig. 7, the first dividing surface 64 has an axial dividing surface 64A extending in the Z direction, a tangential dividing surface 64B extending in the tangential direction, and an inclined surface 64C. The inclined surface 64C is formed at the connection between the axial dividing surface 64A and the tangential dividing surface 64B, and is inclined with respect to the Z direction. Note that the inclined surface 64C may also be considered as a surface inclined with respect to the X direction.

[0040] The second dividing surface 66 has an axial dividing surface 66A extending in the Z direction, a tangential dividing surface 66B extending in the tangential direction, and an inclined surface 66C. The inclined surface 66C is formed at the connection between the axial dividing surface 66A and the tangential dividing surface 66B and is inclined with respect to the Z direction. Note that the inclined surface 66C may also be considered as a surface inclined with respect to the X direction. In addition, an inclined surface 66D is formed at the corner of the tip of the second overlap portion 58.

[0041] In this way, when the inclined surfaces 64C and 66D are formed on the creeping distance L, the creeping distance L can be ensured to be longer by the amount corresponding to the inclined surfaces 64C and 66D formed.

[0042] In addition, if the creepage distance L is determined by the inclined surface 64C of the first dividing surface 64, out of the inclined surface 64C of the first dividing surface 64 and the inclined surface 66C of the second dividing surface 66, the inclined surface 66C of the second dividing surface 66 may be omitted.

[0043] 8, a gap 68 may be provided between the first overlap portion 56 and the winding winding portion 18 in the X direction. With this configuration, the provision of the gap 68 can improve the insulation with respect to the winding winding portion 18.

[0044] Furthermore, the first overlap portion 56 is located on the winding winding portion 18 side (X1 side) relative to the second overlap portion 58, but the second overlap portion 58 may be located on the winding winding portion 18 side (X1 side) relative to the first overlap portion 56. In this case, an inclined surface that defines the creepage distance L may be formed in the second overlap portion 58.

[0045] Furthermore, other configurations (including modified examples) in the first embodiment may be combined with the second embodiment.

[0046] Third Embodiment Next, a third embodiment of the technique of the present disclosure will be described.

[0047] In the third embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in Fig. 9 , the pair of upper second insulating portions 32A arranged on the Z1 side are tapered so that the width between them increases toward the Z2 side before they are attached to the teeth 22. On the other hand, the pair of lower second insulating portions 32B arranged on the Z2 side are tapered so that the width between them increases toward the Z1 side before they are attached to the teeth 22.

[0048] After being attached to the teeth 22, the pair of upper second insulating portions 32A and the pair of lower second insulating portions 32B are pressed toward the teeth 22 by the winding portion 18. The manner in which the pair of upper second insulating portions 32A and the pair of lower second insulating portions 32B are pressed toward the teeth 22 by the winding portion 18 is the same as that shown in FIG.

[0049] In the third embodiment, the first insulating portion 30 of the first insulator 42 is an example of a "first insulating portion" in the technology of the present disclosure, the pair of upper second insulating portions 32A of the first insulator 42 is an example of a "pair of second insulating portions" in the technology of the present disclosure, the first insulating portion 30 of the second insulator 44 is an example of a "third insulating portion" in the technology of the present disclosure, and the pair of lower second insulating portions 32B of the second insulator 44 is an example of a "pair of fourth insulating portions" in the technology of the present disclosure.

[0050] In this way, if the pair of upper second insulating portions 32A are tapered so that the width between them increases toward the Z2 side before being attached to the teeth 22, it is possible to prevent the pair of upper second insulating portions 32A from interfering with the teeth 22 when attaching the pair of upper second insulating portions 32A to the teeth 22. This makes it possible to easily attach the pair of upper second insulating portions 32A to the teeth 22.

[0051] Similarly, if the pair of lower second insulating portions 32B are tapered so that the width between them increases toward the Z1 side before they are attached to the teeth 22, it is possible to prevent the pair of lower second insulating portions 32B from interfering with the teeth 22 when attaching the pair of lower second insulating portions 32B to the teeth 22. This makes it possible to easily attach the pair of lower second insulating portions 32B to the teeth 22.

[0052] It should be noted that other configurations (including modified examples) in the first and second embodiments may be combined with the third embodiment.

[0053] Fourth Embodiment Next, a fourth embodiment of the technique of the present disclosure will be described.

[0054] In the fourth embodiment, the configuration of the insulator 16 is modified as follows compared to the first embodiment: That is, as shown in Fig. 10, the tip 58A of the second overlap portion 58 is inclined with respect to the Y direction when viewed from the X direction.

[0055] In this way, when the tip 58A of the second overlap portion 58 is inclined with respect to the Y direction when viewed from the X direction, the pair of second overlap portions 58 can be easily inserted inside the pair of first overlap portions 56 when combining the first insulator 42 and the second insulator 44 in the Z direction, compared to when the tip 58A of the second overlap portion 58 is parallel to the Y direction when viewed from the X direction.

[0056] In addition, instead of the tip 58A of the second overlap portion 58 being inclined with respect to the Y direction when viewed from the X direction, the tip 56A of the first overlap portion 56 may be inclined with respect to the Y direction when viewed from the X direction.

[0057] In this way, when the tip 56A of the first overlap portion 56 is inclined with respect to the Y direction when viewed from the X direction, the pair of second overlap portions 58 can be easily inserted inside the pair of first overlap portions 56 when combining the first insulator 42 and the second insulator 44 in the Z direction, compared to when the tip 56A of the first overlap portion 56 is parallel to the Y direction when viewed from the X direction.

[0058] Furthermore, in a configuration in which the pair of first overlapping portions 56 are inserted inside the pair of second overlapping portions 58, the tip 56A of the first overlapping portion 56 or the tip 58A of the second overlapping portion 58 may be inclined with respect to the Y direction when viewed from the X direction. In this case, the same effect as above can be obtained.

[0059] Furthermore, other configurations (including modified examples) in the first to third embodiments may be combined with the fourth embodiment.

[0060] Fifth Embodiment Next, a fifth embodiment of the technique of the present disclosure will be described.

[0061] In the fifth embodiment, the configuration of the insulator 16 is changed as follows compared to the first embodiment: That is, as shown in Fig. 11, the insulator 16 has a configuration in which the configuration of the second embodiment is combined with the configuration of the fourth embodiment.

[0062] Specifically, the first divided surface 64 has an axial divided surface 64A extending in the Z direction, a tangential divided surface 64B extending in the tangential direction, and an inclined surface 64C. The second divided surface 66 has an axial divided surface 66A extending in the Z direction, a tangential divided surface 66B extending in the tangential direction, and an inclined surface 66C. An inclined surface 66D is formed at a corner of the tip 58A of the second overlap portion 58. The tip 58A of the second overlap portion 58 is inclined with respect to the Y direction when viewed from the X direction (see FIG. 10 ).

[0063] In this way, when the insulator 16 has a configuration that combines the configuration of the second embodiment with the configuration of the fourth embodiment, the creepage distance L defined by the dividing portion 40 is maintained long, and when the first insulator 42 and the second insulator 44 are combined in the Z direction, the pair of second overlap portions 58 can be easily inserted inside the pair of first overlap portions 56.

[0064] It should be noted that other configurations (including modified examples) in the first to fourth embodiments may be combined with the fifth embodiment.

[0065] Sixth Embodiment Next, a sixth embodiment of the technique of the present disclosure will be described.

[0066] In the sixth embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in FIG. 12 , the insulator 16 is divided in the X direction by a dividing portion 140 into a first insulator 142 and a second insulator 144. The dividing portion 140 is formed in the center of each first insulating portion 30 in the X direction. Each first insulating portion 30 is divided in the X direction by the dividing portion 140 into a right-side first insulating portion 30A and a left-side first insulating portion 30B. Note that the expressions "right side" and "left side" of the right-side first insulating portion 30A and the left-side first insulating portion 30B are used for convenience and do not limit the left-right direction of the stator 10.

[0067] The insulators 16 and the teeth 22 are configured to be plane-symmetrical in the Z direction. Hereinafter, the configuration of the insulators 16 and the teeth 22 on one side in the Z direction will be described, and a description of the configuration on the other side in the Z direction will be omitted. In the following description, the X1 side indicates one side in the tangential direction of the stator core 24, the X2 side indicates the other side in the tangential direction of the stator core 24, the Z1 side indicates one side in the axial direction of the stator core 24, and the Z2 side indicates the other side in the tangential direction of the stator core 24.

[0068] 13 , the first insulating portion 30 has first grooves 146 and 148 formed therein, each opening toward the tooth portion 22. Between the first insulating portion 30 and the tooth portion 22, a first gas layer 150 is provided by the first groove 146, and a second gas layer 152 is provided by the first groove 148. The first gas layer 150 is provided between the right-side first insulating portion 30A and the tooth portion 22 in the Z direction, and the second gas layer 152 is provided between the left-side first insulating portion 30B and the tooth portion 22 in the Z direction. The first gas layer 150 and the second gas layer 152 are arranged side by side in the X direction. The first gas layer 150 and the second gas layer 152 are examples of the “gas layer” and the “third gas layer” in the technology of the present disclosure.

[0069] In the first insulating portion 30, a resin portion 154 is formed between the first gas layer 150 and the second gas layer 152, rather than a gas layer. The resin portion 154 is formed as a contact portion that contacts the end surface 22A of the tooth portion 22. The dividing portion 140 is formed in the resin portion 154. The dividing portion 140 is connected to the second gas layer 152 of the first gas layer 150 and the second gas layer 152. Note that the dividing portion 140 may be connected to the first gas layer 150 of the first gas layer 150 and the second gas layer 152.

[0070] More specifically, the resin portion 154 has an overlap structure. The overlap structure is composed of a first overlap portion 156 formed on the right-side first insulating portion 30A and a second overlap portion 158 formed on the left-side first insulating portion 30B. The first overlap portion 156 extends toward the X2 side, and the second overlap portion 158 extends toward the X1 side. The dividing portion 140 is formed between the first overlap portion 156 and the second overlap portion 158.

[0071] The first overlap portion 156 is located on the tooth 22 side (Z2 side) of the second overlap portion 158. The first overlap portion 156 has a protrusion 174 that protrudes toward the tooth 22 side. The protrusion 174 abuts against the end surface 22A of the tooth 22. The protrusion 174 is provided between the first gas layer 150 and the second gas layer 152 in the X direction. The second overlap portion 158 is located on the winding winding portion 18 side (Z1 side) of the first overlap portion 156 and abuts against the winding winding portion 18.

[0072] The right-side first insulating portion 30A has a first dividing surface 164 that forms the dividing portion 140, and the left-side first insulating portion 30B has a second dividing surface 166 that forms the dividing portion 140. The boundary between the first dividing surface 164 and the second dividing surface 166 is the dividing portion 140. The first dividing surface 164 has a first axial dividing surface 164A that extends in the Z direction, a tangential dividing surface 164B that extends in the X direction, and a second axial dividing surface 164C that extends in the Z direction. The second dividing surface 166 has a first axial dividing surface 166A that extends in the Z direction, a tangential dividing surface 166B that extends in the X direction, and a second axial dividing surface 166C that extends in the Z direction.

[0073] The first axial dividing surface 164A and the first axial dividing surface 166A divide the right-side first insulating portion 30A and the left-side first insulating portion 30B in the X direction, and the tangential dividing surface 164B and the tangential dividing surface 166B divide the right-side first insulating portion 30A and the left-side first insulating portion 30B in the Z direction. The second axial dividing surface 164C and the second axial dividing surface 166C divide the right-side first insulating portion 30A and the left-side first insulating portion 30B in the X direction. The first axial dividing surface 164A and the first axial dividing surface 166A are in contact with each other but may be separated by a gap. The tangential dividing surface 164B and the tangential dividing surface 166B are separated by a gap but may be in contact with each other. The second axial dividing surface 164C and the second axial dividing surface 166C are separated by a gap but may be in contact with each other.

[0074] In this way, when the first gas layer 150 is provided between the right-side first insulating portion 30A and the teeth 22 and the second gas layer 152 is provided between the left-side first insulating portion 30B and the teeth 22, insulation from the winding winding portion 18 can be ensured without thickening the first insulating portion 30, compared to when the first gas layer 150 and the second gas layer 152 are not provided. This makes it possible to ensure insulation from the winding winding portion 18 while suppressing an increase in the size of the stator 10 in the Z direction, compared to when the first insulating portion 30 is thickened.

[0075] Furthermore, a resin portion 154, rather than a gas layer, is formed between the first gas layer 150 and the second gas layer 152 in the first insulating portion 30. The resin portion 154 has an overlap structure in which a first overlap portion 156 formed in the right-side first insulating portion 30A overlaps a second overlap portion 158 formed in the left-side first insulating portion 30B. The dividing portion 140 is formed to pass between the first overlap portion 156 and the second overlap portion 158. Therefore, the creepage distance L defined by the dividing portion 140 can be ensured to be longer by the amount that the dividing portion 140 passes between the first overlap portion 156 and the second overlap portion 158, and the insulating properties of the dividing portion 140 can also be ensured. As a result, for example, compared to a case in which the overlap structure is not provided, the insulation properties for the winding winding portion 18 can be ensured while suppressing an increase in the physical size of the stator 10.

[0076] Furthermore, the dividing portion 140 is connected to the first gas layer 150. Therefore, the first gas layer 150 is present on the creepage distance L, and therefore, the insulation can be improved compared to when the first gas layer 150 is not present.

[0077] Furthermore, a protrusion 174 is formed on the first overlap portion 156, and the protrusion 174 abuts against the side surface 22B of the tooth portion 22. This prevents the second insulating portion 32 from bending toward the tooth portion 22 due to the tightening force of the winding winding portion 18. This prevents the widths of the first gas layer 150 and the second gas layer 152 in the Z direction from decreasing.

[0078] 14 , the first gas layer 150 and the second gas layer 152 provided between the first insulating portion 30 and the teeth portion 22 may be omitted, and a gas layer 170 may be provided between the second insulating portion 32 and the teeth portion 22. The gas layer 170 is an example of a “third gas layer” in the technology of the present disclosure.

[0079] Also, as shown in Figure 15, a first gas layer 150 and a second gas layer 152 may be provided between the first insulating portion 30 and the tooth portion 22, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0080] In addition, the second overlap portion 158 is located on the winding winding portion 18 side (Z1 side) relative to the first overlap portion 156, but the first overlap portion 156 may also be located on the winding winding portion 18 side (Z1 side) relative to the second overlap portion 158.

[0081] Seventh Embodiment Next, a seventh embodiment of the technique of the present disclosure will be described.

[0082] In the seventh embodiment, the configuration of the insulator 16 is modified as follows from that of the sixth embodiment. That is, as shown in FIG. 16 , the first dividing surface 164 has a first axial dividing surface 164A extending in the Z direction, a tangential dividing surface 164B extending in the tangential direction, a second axial dividing surface 164C extending in the Z direction, a first inclined surface 164D, and a second inclined surface 164E. The first inclined surface 164D is formed at the connection between the first axial dividing surface 164A and the tangential dividing surface 164B and is inclined with respect to the X direction. The second inclined surface 164E is formed at the connection between the second axial dividing surface 164C and the tangential dividing surface 164B and is inclined with respect to the X direction. The first inclined surface 164D and the second inclined surface 164E may also be considered as surfaces inclined with respect to the Z direction.

[0083] The second divided surface 166 has a first axial divided surface 166A extending in the Z direction, a tangential divided surface 166B extending in the tangential direction, a second axial divided surface 166C extending in the Z direction, a first inclined surface 166D, and a second inclined surface 166E. The first inclined surface 166D is formed at the connection between the first axial divided surface 166A and the tangential divided surface 166B and is inclined with respect to the X direction. The second inclined surface 166E is formed at the connection between the second axial divided surface 166C and the tangential divided surface 166B and is inclined with respect to the X direction. Note that the first inclined surface 166D and the second inclined surface 166E may also be considered as surfaces inclined with respect to the Z direction.

[0084] In this way, when the first inclined surface 164D, the second inclined surface 164E, the first inclined surface 166D, and the second inclined surface 166E are formed on the creeping distance L, the creeping distance L can be made longer by the amount that the first inclined surface 164D, the second inclined surface 164E, the first inclined surface 166D, and the second inclined surface 166E are formed.

[0085] Note that, among the first inclined surface 164D, the second inclined surface 164E, the first inclined surface 166D, and the second inclined surface 166E, the inclined surface that does not define the creeping distance L may be omitted.

[0086] Also, as shown in Figure 17, the first gas layer 150 and the second gas layer 152 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0087] Also, as shown in Figure 18, a first gas layer 150 and a second gas layer 152 may be provided between the first insulating portion 30 and the tooth portion 22, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0088] Furthermore, other configurations (including modified examples) in the sixth embodiment may be combined with the seventh embodiment.

[0089] Eighth Embodiment Next, an eighth embodiment of the technique of the present disclosure will be described.

[0090] In the eighth embodiment, the configuration of the insulator 16 is modified as follows from the sixth embodiment. That is, as shown in Fig. 19 , the pair of right first insulating portions 30A arranged on the X1 side are tapered so that the width between them increases toward the X2 side before they are attached to the teeth 22. On the other hand, the pair of left first insulating portions 30B arranged on the X2 side are tapered so that the width between them increases toward the X1 side before they are attached to the teeth 22.

[0091] After being attached to the teeth 22, the pair of right-side first insulating portions 30A and the pair of left-side first insulating portions 30B are pressed toward the teeth 22 by the winding portion 18. The manner in which the pair of right-side first insulating portions 30A and the pair of left-side first insulating portions 30B are pressed toward the teeth 22 by the winding portion 18 is the same as that shown in FIG.

[0092] In the eighth embodiment, the second insulating portion 32 of the first insulator 142 is an example of a "first insulating portion" in the technology of the present disclosure, the pair of right-side first insulating portions 30A of the first insulator 142 is an example of a "pair of second insulating portions" in the technology of the present disclosure, the second insulating portion 32 of the second insulator 144 is an example of a "third insulating portion" in the technology of the present disclosure, and the pair of left-side first insulating portions 30B of the second insulator 144 is an example of a "pair of fourth insulating portions" in the technology of the present disclosure.

[0093] In this way, if the pair of right side first insulating portions 30A are tapered so that the width between them increases toward the X2 side before being attached to the teeth 22, it is possible to prevent the pair of right side first insulating portions 30A from interfering with the teeth 22 when attaching the pair of right side first insulating portions 30A to the teeth 22. This makes it possible to easily attach the pair of right side first insulating portions 30A to the teeth 22.

[0094] Similarly, if the pair of left first insulating portions 30B are tapered so that the width between them increases toward the X1 side before being attached to the teeth 22, it is possible to prevent the pair of left first insulating portions 30B from interfering with the teeth 22 when attaching the pair of left first insulating portions 30B to the teeth 22. This makes it possible to easily attach the pair of left first insulating portions 30B to the teeth 22.

[0095] It should be noted that other configurations (including modified examples) in the sixth and seventh embodiments may be combined with the eighth embodiment.

[0096] Ninth Embodiment Next, a ninth embodiment of the technique of the present disclosure will be described.

[0097] In the ninth embodiment, the configuration of the insulator 16 is modified as follows from the sixth embodiment. That is, as shown in Figures 20 and 21 , the tip 156A of the first overlap portion 156 (i.e., the second axial dividing surface 164C) is inclined with respect to the Y direction when viewed from the Z direction. Furthermore, the second axial dividing surface 166C opposed to the tip 156A of the first overlap portion 156 is also inclined like the second axial dividing surface 164C.

[0098] In this way, when the tip 156A of the first overlap portion 156 is inclined with respect to the Y direction when viewed from the Z direction, the pair of first overlap portions 156 can be easily inserted inside the pair of second overlap portions 158 when combining the first insulator 142 and the second insulator 144 in the X direction, compared to when the tip 156A of the first overlap portion 156 is parallel to the Y direction when viewed from the Z direction.

[0099] In addition, instead of the tip 156A of the first overlap portion 156 being inclined with respect to the Y direction when viewed from the Z direction, the tip 158A of the second overlap portion 158 (i.e., the first axial dividing surface 166A) may be inclined with respect to the Y direction when viewed from the Z direction.

[0100] In this way, when the tip 158A of the second overlap portion 158 is inclined with respect to the Y direction when viewed from the Z direction, the pair of first overlap portions 156 can be easily inserted inside the pair of second overlap portions 158 when combining the first insulator 142 and the second insulator 144 in the X direction, compared to when the tip 158A of the second overlap portion 158 is parallel to the Y direction when viewed from the Z direction.

[0101] Furthermore, in a configuration in which the pair of second overlapping portions 158 are inserted inside the pair of first overlapping portions 156, the tip 156A of the first overlapping portion 156 or the tip 158A of the second overlapping portion 158 may be inclined with respect to the Y direction when viewed from the Z direction. In this case as well, the same effect as above can be obtained.

[0102] Also, as shown in Figures 22 and 23, the first gas layer 150 and the second gas layer 152 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0103] Also, as shown in Figure 24, a first gas layer 150 and a second gas layer 152 may be provided between the first insulating portion 30 and the tooth portion 22, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0104] Furthermore, other configurations (including modified examples) in the sixth to eighth embodiments may be combined with the ninth embodiment.

[0105] Tenth Embodiment Next, a tenth embodiment of the technique of the present disclosure will be described.

[0106] In the tenth embodiment, the configuration of the insulator 16 is changed as follows compared to the sixth embodiment: That is, as shown in Fig. 25, the insulator 16 has a configuration in which the configuration of the seventh embodiment is combined with the configuration of the ninth embodiment.

[0107] Specifically, the first divided surface 164 has a first axial divided surface 164A extending in the Z direction, a tangential divided surface 166B extending in the tangential direction, a second axial divided surface 164C extending in the Z direction, a first inclined surface 164D, and a second inclined surface 164E. The second divided surface 166 has a first axial divided surface 166A extending in the Z direction, a tangential divided surface 166B extending in the tangential direction, a second axial divided surface 166C extending in the Z direction, a first inclined surface 166D, and a second inclined surface 166E. The tip 156A of the first overlap portion 156 (i.e., the second axial divided surface 164C) is inclined with respect to the Y direction when viewed from the Z direction (see FIG. 21 ).

[0108] In this way, when the insulator 16 has a configuration that combines the configuration of the seventh embodiment with the configuration of the ninth embodiment, the creepage distance L defined by the dividing portion 140 is kept long, and when the first insulator 142 and the second insulator 144 are combined in the X direction, the pair of first overlap portions 156 can be easily inserted inside the pair of second overlap portions 158.

[0109] As shown in Figure 26, the first gas layer 150 and the second gas layer 152 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0110] Also, as shown in Figure 27, a first gas layer 150 and a second gas layer 152 may be provided between the first insulating portion 30 and the tooth portion 22, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0111] Furthermore, other configurations (including modified examples) in the sixth to ninth embodiments may be combined with the tenth embodiment.

[0112] Eleventh Embodiment Next, an eleventh embodiment of the technique of the present disclosure will be described.

[0113] In the eleventh embodiment, the configuration of the insulator 16 is changed as follows compared to the first embodiment. That is, as shown in Fig. 28 , the insulator 16 is divided into a first insulator 242 and a second insulator 244 in the X direction and the Z direction by a dividing portion 240. The dividing portion 240 is formed between the first insulating portion 30 and the second insulating portion 32.

[0114] The insulator 16 and the teeth 22 are configured point-symmetrically around the Y direction. Below, the configuration of the insulator 16 and the teeth 22 around one divided portion 240 will be described, and the configuration of the configuration around the other divided portion 240 will be omitted. In the following description, the X1 side indicates one side in the tangential direction of the stator core 24, the X2 side indicates the other side in the tangential direction of the stator core 24, the Z1 side indicates one side in the axial direction of the stator core 24, and the Z2 side indicates the other side in the tangential direction of the stator core 24.

[0115] As shown in Figure 29, a groove 246 that opens toward the teeth 22 is formed in the first insulating portion 30, and a gas layer 250 is provided by the groove 246 between the first insulating portion 30 and the teeth 22 in the Z direction. The gas layer 250 is an example of a "third gas layer" in the technology of the present disclosure. At the connection between the first insulating portion 30 and the second insulating portion 32, a resin portion 254 is formed instead of a gas layer. The resin portion 254 is formed as an abutment portion that abuts against the end surface 22A of the teeth 22. The dividing portion 240 is formed in the resin portion 254.

[0116] More specifically, the resin part 254 has an overlap structure. The overlap structure is composed of a first overlap portion 256 formed in the first insulating part 30 and a second overlap portion 258 formed in the second insulating part 32. The first overlap portion 256 extends toward the Z2 side, and the second overlap portion 258 extends toward the Z1 side. The dividing portion 240 is formed between the first overlap portion 256 and the second overlap portion 258.

[0117] The first overlap portion 256 is located inside the second overlap portion 258 in the width direction (X direction) of the tooth portion 22 and abuts against the end surface 22A of the tooth portion 22. The second overlap portion 258 is located outside the first overlap portion 256 in the width direction (X direction) of the tooth portion 22 and abuts against the winding portion 18.

[0118] The first insulating part 30 has a first dividing surface 264 that forms the dividing portion 240, and the second insulating part 32 has a second dividing surface 266 that forms the dividing portion 240. The boundary between the first dividing surface 264 and the second dividing surface 266 is the dividing portion 240. The first dividing surface 264 has an axial dividing surface 264A that extends in the Z direction and a tangential dividing surface 264B that extends in the X direction. The second dividing surface 266 has an axial dividing surface 266A that extends in the Z direction and a tangential dividing surface 266B that extends in the X direction.

[0119] The axial dividing surface 264A and the axial dividing surface 266A divide the first insulating portion 30 and the second insulating portion 32 in the X direction, and the tangential dividing surface 264B and the tangential dividing surface 266B divide the first insulating portion 30 and the second insulating portion 32 in the Z direction. The axial dividing surface 264A and the axial dividing surface 266A may be in contact with each other or may be separated by a gap. Similarly, the tangential dividing surface 264B and the tangential dividing surface 266B may be in contact with each other or may be separated by a gap.

[0120] In this way, when gas layer 250 is provided between first insulating portion 30 and tooth portion 22, insulation from winding portion 18 can be ensured without thickening first insulating portion 30, compared to when gas layer 250 is not provided. This makes it possible to ensure insulation from winding portion 18 while suppressing an increase in the size of stator 10 in the Z direction, compared to when first insulating portion 30 is thickened.

[0121] Furthermore, a resin portion 254 is formed at the connection between the first insulating portion 30 and the second insulating portion 32. The resin portion 254 has an overlap structure in which a first overlap portion 256 formed in the first insulating portion 30 and a second overlap portion 258 formed in the second insulating portion 32 overlap with each other. The divided portion 240 is formed to pass between the first overlap portion 256 and the second overlap portion 258. Therefore, since the divided portion 240 passes between the first overlap portion 256 and the second overlap portion 258, the creepage distance L defined by the divided portion 240 can be ensured to be long, and the insulation properties of the divided portion 240 can also be ensured. As a result, for example, compared to a case in which the overlap structure is not provided, the insulation properties with respect to the winding winding portion 18 can be ensured while suppressing an increase in the physical size of the stator 10.

[0122] Furthermore, the resin portion 254 abuts against the end surface 22A of the tooth portion 22. This prevents the first insulating portion 30 from bending toward the tooth portion 22 due to the tightening force of the winding portion 18. This prevents the width of the gas layer 250 in the Z direction from decreasing.

[0123] 30 , the gas layer 250 provided between the first insulating portion 30 and the teeth portion 22 may be omitted, and a gas layer 270 may be provided between the second insulating portion 32 and the teeth portion 22. The gas layer 270 is an example of the “third gas layer” in the technology of the present disclosure.

[0124] Furthermore, as shown in FIG. 31 , a gas layer 250 may be provided between the first insulating portion 30 and the teeth portion 22 , and a gas layer 270 may be provided between the second insulating portion 32 and the teeth portion 22 .

[0125] Twelfth Embodiment Next, a twelfth embodiment of the technique of the present disclosure will be described.

[0126] In the twelfth embodiment, the configuration of the insulator 16 is modified as follows from the eleventh embodiment. That is, as shown in FIG. 32 , the first dividing surface 264 has an axial dividing surface 264A extending in the Z direction, a tangential dividing surface 264B extending in the tangential direction, a first inclined surface 264C, and a second inclined surface 264D. The first inclined surface 264C is formed at the connection between the axial dividing surface 264A and the tangential dividing surface 264B and is inclined with respect to the Z direction. The second inclined surface 264D is formed at a corner at the tip of the first overlap portion 256 and is inclined with respect to the X direction. The first inclined surface 264C may be regarded as a surface inclined with respect to the X direction. The second inclined surface 264D may be regarded as a surface inclined with respect to the Z direction.

[0127] The second dividing surface 266 has an axial dividing surface 266A extending in the Z direction, a tangential dividing surface 266B extending in the tangential direction, and an inclined surface 266C. The inclined surface 266C is formed at the connection between the axial dividing surface 266A and the tangential dividing surface 266B, and is inclined with respect to the Z direction. Note that the inclined surface 266C may also be considered as a surface inclined with respect to the X direction.

[0128] In this way, when the first inclined surface 264C and the inclined surface 266C are formed on the creeping distance L, the creeping distance L can be ensured to be longer by the amount corresponding to the formation of the first inclined surface 264C and the inclined surface 266C.

[0129] Note that, among the first inclined surface 264C, the second inclined surface 264D, and the inclined surface 266C, the inclined surface that does not define the creeping distance L may be omitted.

[0130] Also, as shown in Figure 33, the gas layer 250 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 270 may be provided between the second insulating portion 32 and the tooth portion 22.

[0131] Furthermore, as shown in FIG. 34 , a gas layer 250 may be provided between the first insulating portion 30 and the teeth portion 22 , and a gas layer 270 may be provided between the second insulating portion 32 and the teeth portion 22 .

[0132] Furthermore, other configurations (including modified examples) in the eleventh embodiment may be combined with the twelfth embodiment.

[0133] Thirteenth Embodiment Next, a thirteenth embodiment of the technique of the present disclosure will be described.

[0134] In the thirteenth embodiment, the configuration of the insulator 16 is modified as follows compared to the first embodiment. That is, as shown in FIG. 35 , a protrusion 74 that protrudes toward the tooth portion 22 is formed in the center of the second insulating portion 32 in the Z direction. The protrusion 74 is an example of a "resin portion" in the technology of the present disclosure. The protrusion 74 is formed as a contact portion that contacts the side surface 22B of the tooth portion 22. The protrusion 74 is provided between the first gas layer 50 and the second gas layer 52 in the Z direction.

[0135] The dividing portion 40 is formed at a position between the first gas layer 50 and the second gas layer 52 in the Z direction. Specifically, the dividing portion 40 is formed in the protruding portion 74. The dividing portion 40 is formed linearly along the X direction. The upper second insulating portion 32A and the lower second insulating portion 32B are in close contact with each other in the Z direction at the dividing portion 40. For example, the upper second insulating portion 32A and the lower second insulating portion 32B are formed with dimensions that allow them to be in close contact with each other in the Z direction at the dividing portion 40 (in other words, dimensions that do not create a gap at the dividing portion 40), and are in close contact with each other in the Z direction at the dividing portion 40 due to the tightening force in the Z direction by the winding winding portion 18.

[0136] When the upper second insulating portion 32A and the lower second insulating portion 32B are in close contact in the Z direction at the divided portion 40 in this way, the insulation at the divided portion 40 can be ensured compared to, for example, a case where a gap occurs at the divided portion 40. As a result, the insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18 compared to a case where the second insulating portion 32 is made thicker. Furthermore, because the space factor of the winding winding portion 18 does not need to be reduced, an increase in the size of the stator 10 can be suppressed.

[0137] Note that other configurations (including modified examples) in the first to twelfth embodiments may be combined with the thirteenth embodiment.

[0138] Fourteenth Embodiment Next, a fourteenth embodiment of the technique of the present disclosure will be described.

[0139] In the fourteenth embodiment, the configuration of the insulator 16 is modified as follows compared to the sixth embodiment. That is, as shown in FIG. 36 , a protrusion 174 that protrudes toward the tooth portion 22 is formed in the center of the first insulating portion 30 in the X direction. The protrusion 174 is an example of a "resin portion" in the technology of the present disclosure. The protrusion 174 is formed as a contact portion that contacts the end surface 22A of the tooth portion 22. The protrusion 174 is provided between the first gas layer 150 and the second gas layer 152 in the X direction.

[0140] The dividing portion 140 is formed at a position between the first gas layer 150 and the second gas layer 152 in the X direction. Specifically, the dividing portion 140 is formed in the protruding portion 174. The dividing portion 140 is formed linearly along the Z direction. The right-side first insulating portion 30A and the left-side first insulating portion 30B are in close contact with each other in the X direction at the dividing portion 140. For example, the right-side first insulating portion 30A and the left-side first insulating portion 30B are formed with dimensions that allow them to be in close contact with each other in the X direction at the dividing portion 140 (in other words, dimensions that do not create a gap at the dividing portion 140), and are in close contact with each other in the X direction at the dividing portion 140 due to the tightening force in the X direction by the winding winding portion 18.

[0141] In this way, when the right-side first insulating portion 30A and the left-side first insulating portion 30B are in close contact in the X direction at the divided portion 140, insulation at the divided portion 140 can be ensured compared to, for example, a case where a gap occurs at the divided portion 140. Therefore, insulation from the winding winding portion 18 can be ensured without increasing the thickness of the first insulating portion 30. As a result, insulation from the winding winding portion 18 can be ensured while suppressing an increase in the size of the stator 10 in the Z direction compared to a case where the thickness of the first insulating portion 30 is increased.

[0142] As shown in Figure 37, the first gas layer 150 and the second gas layer 152 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0143] Also, as shown in Figure 38, a first gas layer 150 and a second gas layer 152 may be provided between the first insulating portion 30 and the tooth portion 22, and a gas layer 170 may be provided between the second insulating portion 32 and the tooth portion 22.

[0144] Furthermore, other configurations (including modified examples) in the first to thirteenth embodiments may be combined with the fourteenth embodiment.

[0145] Fifteenth Embodiment Next, a fifteenth embodiment of the technique of the present disclosure will be described.

[0146] In the fifteenth embodiment, the configuration of the insulator 16 is modified as follows from the eleventh embodiment. That is, as shown in FIG. 39 , the divided portion 240 is formed linearly along the X direction. The first insulating portion 30 and the second insulating portion 32 are in close contact with each other in the Z direction at the divided portion 240. For example, the first insulating portion 30 and the second insulating portion 32 are formed with dimensions that allow them to be in close contact with each other in the Z direction at the divided portion 240 (in other words, dimensions that do not create gaps at the divided portion 240), and are in close contact with each other in the Z direction at the divided portion 240 due to the tightening force in the Z direction by the winding winding portion 18.

[0147] In this way, when the first insulating portion 30 and the second insulating portion 32 are in close contact in the Z direction at the divided portion 240, it is possible to ensure insulation at the divided portion 240 compared to, for example, a case where a gap occurs at the divided portion 240. This makes it possible to suppress an increase in the size of the stator 10 compared to a case where the first insulating portion 30 and the second insulating portion 32 are thickened.

[0148] As shown in Figure 40, the gas layer 250 provided between the first insulating portion 30 and the tooth portion 22 may be omitted, and a gas layer 270 may be provided between the second insulating portion 32 and the tooth portion 22.

[0149] Furthermore, as shown in FIG. 41 , a gas layer 250 may be provided between the first insulating portion 30 and the teeth portion 22 , and a gas layer 270 may be provided between the second insulating portion 32 and the teeth portion 22 .

[0150] Furthermore, other configurations (including modified examples) in the first to fourteenth embodiments may be combined with the fifteenth embodiment.

[0151] Sixteenth Embodiment Next, a sixteenth embodiment of the technique of the present disclosure will be described.

[0152] In the sixteenth embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in Figures 42 to 45, the insulator 16 has a pair of first insulating members 330 and a pair of second insulating members 332. The pair of first insulating members 330 is an example of a "pair of insulating portions" and a "pair of first insulating portions" in the technology of the present disclosure, and the pair of second insulating members 332 is an example of a "pair of second insulating portions" in the technology of the present disclosure.

[0153] 46 , the pair of first insulating members 330 each extend in the Z direction. The pair of first insulating members 330 are arranged on both sides of the tooth portion 22 in the X direction, and cover the side surfaces 22A of the tooth portion 22 on both sides in the X direction. The pair of second insulating members 332 each extend in the X direction. The pair of second insulating members 332 are arranged on both sides of the tooth portion 22 in the Z direction, and cover the end surfaces 22B of the tooth portion 22 on both sides in the Z direction.

[0154] Each first insulating member 330 has a pair of fitting portions 334. The pair of fitting portions 334 are formed at both ends in the Z direction of the first insulating member 330. Each fitting portion 334 is formed in a convex shape that protrudes in the Y direction.

[0155] Each second insulating member 332 has a pair of fitted portions 336. The pair of fitted portions 336 are formed at both ends in the X direction of the second insulating member 332. Each fitted portion 336 is formed in a concave shape that is recessed in the Z direction.

[0156] The fitting portion 334 is fitted into the fitted portion 336. The fitting portion 334 and the fitted portion 336 may be fitted by press fitting or by clearance fit. The first insulating member 330 is fixed to the second insulating member 332 by fitting the fitting portion 334 into the fitted portion 336. Furthermore, a gas layer 338 is provided between the teeth portion 22 and each first insulating member 330 in the X direction. The positions of the fitting portion 334 and the fitted portion 336 in the X direction are set so that the gas layer 338 is provided between the teeth portion 22 and each first insulating member 330 in the X direction.

[0157] In this way, when the insulator 16 is configured to have a pair of first insulating members 330 and a pair of second insulating members 332, there is no need to ensure a creepage distance at the dividing portion, as is the case, for example, when the insulator 16 is configured to be divided into two in the Z direction by a dividing portion set in the center of the tooth portion 22 in the Z direction.

[0158] Furthermore, since a gas layer 338 is provided between the tooth portion 22 and each first insulating member 330 in the X direction, insulation from the winding winding portion 18 can be ensured without increasing the thickness of the first insulating member 330, compared to, for example, a case in which the gas layer 338 is not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to a case in which the thickness of the first insulating member 330 is increased.

[0159] Furthermore, the first insulating member 330 has a fitting portion 334, and the second insulating member 332 has a fitted portion 336 that is fitted with the fitting portion 334. As a result, the multiple surfaces formed on the fitting portion 334 and the fitted portion 336 can increase the creepage distance L between the teeth portion 22 and the winding winding portion 18, thereby further ensuring insulation from the winding winding portion 18.

[0160] Furthermore, the fitting portion 334 is formed in a convex shape, and the fitted portion 336 is formed in a concave shape. This makes it possible to suppress an increase in the thickness of the first insulating member 330 compared to, for example, a case in which the fitting portion 334 is formed in a concave shape and the fitted portion 336 is formed in a convex shape, and therefore it is possible to suppress a decrease in the space factor of the winding winding portion 18.

[0161] Each second insulating member 332 may have a pair of protrusions 344. The pair of protrusions 344 is formed on both ends of the second insulating member 332 in the X direction. Each protrusion 344 protrudes in the X direction away from the tooth portion 22 and abuts against the winding portion 18. A gas layer 346 may be formed between the second insulating member 332 and the winding portion 18 by the protrusions 344 abutting against the winding portion 18. With this configuration, insulation from the winding portion 18 can be ensured without increasing the thickness of the first insulating member 330, compared to a case where the gas layer 346 is not provided.

[0162] 47 , the fitting portion 334 may have a step 340 that protrudes toward the tooth portion 22 and abuts against the side surface 22A of the tooth portion 22. The step 340 is an example of an "abutment portion" in the technology of the present disclosure. With this configuration, the step 340 abuts against the side surface 22A of the tooth portion 22, thereby increasing the support rigidity of the first insulating member 330 with respect to the tooth portion 22. This prevents the first insulating member 330 from bending due to the tightening force of the winding portion 18, thereby preventing the gas layer 338 from shrinking.

[0163] 48 , the fitting portion 334 may be formed with locking portions 342 that protrude in the X direction toward the teeth 22 and are locked to the teeth 22 from the Z direction. With this configuration, for example, the formation of the locking portions 342 in the fitting portion 334 can increase the creepage distance L between the teeth 22 and the winding portion 18, thereby further ensuring insulation from the winding portion 18.

[0164] Furthermore, since the locking portions 342 can be locked to the teeth 22 from the Z direction, the ease of assembling the first insulating member 330 to the teeth 22 can be improved.

[0165] Seventeenth Embodiment Next, a seventeenth embodiment of the technique of the present disclosure will be described.

[0166] In the seventeenth embodiment, the configuration of the insulator 16 is changed as follows compared to the sixteenth embodiment. That is, as shown in Figures 49 to 51, the insulator 16 is formed in a continuous ring shape around the Y direction so as to surround the teeth 22. As shown in Figure 52, the teeth 22 are formed in a straight shape in the radial direction of the stator core 24 so that they can be inserted inside the ring-shaped insulator 16.

[0167] 53 , the insulator 16 has a pair of first insulating portions 350 and a pair of second insulating portions 352. The pair of first insulating portions 350 is an example of a “pair of insulating portions” and a “pair of first insulating portions” in the technology of the present disclosure, and the pair of second insulating portions 352 is an example of a “pair of second insulating portions” in the technology of the present disclosure.

[0168] The pair of first insulating portions 350 each extend in the Z direction. The pair of first insulating portions 350 are arranged on both sides of the tooth portion 22 in the X direction, and cover the side surfaces 22A of the tooth portion 22 on both sides in the X direction. The pair of second insulating portions 352 each extend in the X direction. The pair of second insulating portions 352 are arranged on both sides of the tooth portion 22 in the Z direction, and cover the end surfaces 22B of the tooth portion 22 on both sides in the Z direction.

[0169] Each first insulating portion 350 has a pair of step portions 360. The pair of step portions 360 are formed in a stepped shape at both ends of the first insulating portion 350 in the Z direction. Each step portion 360 abuts against the side surface 22A of the tooth portion 22. As each step portion 360 abuts against the side surface 22A of the tooth portion 22, a gas layer 358 is provided between the tooth portion 22 and each first insulating portion 350 in the X direction. The step portions 360 are an example of an "abutment portion" in the technology of the present disclosure.

[0170] In this way, when the insulator 16 is formed in a continuous ring shape around the Y direction to surround the tooth portion 22, there is no need to ensure a creepage distance at the dividing portion, as is the case, for example, when the insulator 16 is configured to be divided into two in the Z direction by a dividing portion set in the center of the tooth portion 22 in the Z direction.

[0171] Furthermore, compared to when the insulator 16 is divided into multiple members by a dividing portion, it is possible to prevent the occurrence of a creepage distance along the dividing portion, which eliminates the need to add a structure to the insulator 16 for increasing the creepage distance, thereby simplifying the configuration of the insulator 16.

[0172] Furthermore, because a gas layer 358 is provided between the tooth portion 22 and each first insulating portion 350 in the X direction, insulation from the winding winding portion 18 can be ensured without thickening the first insulating portion 350, compared to, for example, a case in which the gas layer 358 is not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to a case in which the first insulating portion 350 is thickened.

[0173] Furthermore, the step portion 360 abuts against the side surface 22A of the tooth portion 22, thereby increasing the support rigidity of the first insulating portion 350 with respect to the tooth portion 22. This makes it possible to prevent the first insulating portion 350 from bending due to the tightening force of the winding portion 18, thereby preventing the gas layer 358 from shrinking.

[0174] 54 , each first insulating portion 350 may have a protrusion 364 that protrudes toward the tooth portion 22 and abuts against the side surface 22A of the tooth portion 22. The protrusion 364 is an example of an "abutment portion" in the technology of the present disclosure. With this configuration, the support rigidity of the first insulating portion 350 with respect to the tooth portion 22 can be further increased.

[0175] Furthermore, protrusion 364 may be formed by a part of first insulating portion 350 protruding toward tooth portion 22, and recess 366 opening toward winding portion 18 may be formed in a portion of first insulating portion 350 corresponding to protrusion 364. Furthermore, gas layer 358 may be divided into multiple first gas layers 368 in the Z direction by protrusion 364, and second gas layers 370 may be provided by recess 366 between winding portion 18 and each first insulating portion 350 in the X direction, and the multiple first gas layers 368 and second gas layers 370 may be staggered.

[0176] With this configuration, even if a protrusion 364 is formed on each first insulating portion 350, the second gas layer 370 is secured at a position corresponding to the protrusion 364, thereby ensuring insulation for the winding winding portion 18.

[0177] Eighteenth Embodiment Next, an eighteenth embodiment of the technique of the present disclosure will be described.

[0178] In the eighteenth embodiment, the configuration of the insulator 16 is modified as follows from the sixteenth embodiment. That is, as shown in Figures 55 to 57, the insulator 16 has a pair of first insulating portions 380, a second insulating portion 382, ​​and a pair of protrusions 384. The pair of first insulating portions 380 is an example of the "pair of first insulating portions" in the technology of the present disclosure, and the second insulating portion 382 is an example of the "second insulating portion" in the technology of the present disclosure.

[0179] As shown in FIG. 58 , the pair of first insulating portions 380 each extend in the Z direction. The pair of first insulating portions 380 are arranged on both sides of the tooth portion 22 in the X direction, and each cover the side surfaces 22A of the tooth portion 22 on both sides in the X direction. The second insulating portion 382 extends in the X direction. The second insulating portion 382 is arranged on one side of the tooth portion 22 in the Z direction, and connects the ends of the pair of first insulating portions 380 on one side in the Z direction. The second insulating portion 382 each cover the end surfaces 22B of the tooth portion 22 on one side in the Z direction. A gas layer 388 is provided between the tooth portion 22 and each first insulating portion 380 in the X direction.

[0180] The pair of protrusions 384 protrude from the end of each first insulating portion 380 opposite the second insulating portion 382 to opposite sides (i.e., toward the inner side in the width direction of the tooth portion 22). The pair of protrusions 384 are arranged on the other side in the Z direction relative to the tooth portion 22. The pair of protrusions 384 may be engaged with the end surface 22B on the other side in the Z direction of the tooth portion 22, or may be spaced apart in the Z direction from the other end surface 22B.

[0181] In this way, when the insulator 16 is configured to have a pair of first insulating portions 380 and second insulating portions 382, ​​the insulator 16 can be attached to the tooth portion 22 from one side in the Z direction.

[0182] Furthermore, when the insulator 16 is configured to have a pair of first insulating portions 380 and a second insulating portion 382, ​​there is no need to ensure a creepage distance at the dividing portion, as is the case, for example, when the insulator 16 is configured to be divided into two in the Z direction by a dividing portion set in the center of the tooth portion 22 in the Z direction.

[0183] Furthermore, since a gas layer 388 is provided between the tooth portion 22 and each first insulating portion 380 in the X direction, insulation from the winding winding portion 18 can be ensured without thickening the first insulating portion 380, compared to, for example, a case in which the gas layer 388 is not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to a case in which the first insulating portion 380 is thickened.

[0184] Furthermore, the insulator 16 has a pair of protrusions 384 that protrude in opposing directions from the end of each first insulating portion 380 opposite the second insulating portion 382, ​​and the pair of protrusions 384 are arranged on the other side in the Z direction relative to the tooth portion 22. Therefore, the pair of protrusions 384 are engaged with the end surface 22B on the other side in the Z direction of the tooth portion 22, thereby preventing the insulator 16 from coming off the tooth portion 22 to one side in the Z direction.

[0185] Furthermore, each protrusion 384 can increase the creepage distance L between the tooth portion 22 and the winding portion 18, thereby further ensuring insulation from the winding portion 18.

[0186] Furthermore, if the protrusion 384 is spaced apart in the Z direction from the other end face 22B of the tooth portion 22, a gas layer 386 can be formed between the protrusion 384 in the Z direction and the other end face 22B of the tooth portion 22, thereby further ensuring insulation against the winding winding portion 18.

[0187] 59 , a step 390 may be formed at a corner of the other end face 22B of the tooth 22. The protrusion 384 may be disposed on the step 390 and spaced apart in the Z direction from the other end face 22B of the tooth 22 (i.e., the step surface of the step 390). Even with this configuration, a gas layer 386 can be provided between the protrusion 384 and the other end face 22B of the tooth 22 in the Z direction, thereby further ensuring insulation from the winding 18.

[0188] 60, a surface 384A of the protrusion 384 facing the other end surface 22B of the tooth 22 may be formed as an inclined surface that is inclined with respect to the X direction (i.e., the protruding direction of the protrusion 384). With this configuration, the creepage distance L between the tooth 22 and the winding winding portion 18 can be increased compared to when the facing surface 384A is parallel to the X direction, thereby further ensuring insulation from the winding winding portion 18.

[0189] Nineteenth Embodiment Next, a nineteenth embodiment of the technique of the present disclosure will be described.

[0190] In the nineteenth embodiment, the configuration of the insulator 16 is modified as follows compared to the sixteenth embodiment. That is, as shown in Figures 61 to 64, the insulator 16 has a pair of insulating members 400. The pair of insulating members 400 is an example of the "pair of insulating portions" in the technology of the present disclosure.

[0191] The pair of insulating members 400 each extend in the Z direction. The pair of insulating members 400 are disposed on both sides of the tooth portion 22 in the X direction, and cover the side surfaces 22A of the tooth portion 22 on both sides in the X direction.

[0192] Each first insulating member 400 has a pair of step portions 410 and a pair of locking portions 412. Each step portion 410 is an example of an "abutment portion" in the technology of the present disclosure. The pair of step portions 410 are formed at both ends of the insulating member 400 in the Z direction. Each step portion 410 protrudes toward the tooth portion 22 and abuts against the side surface 22A of the tooth portion 22. As each step portion 410 abuts against the side surface 22A of the tooth portion 22, a gas layer 408 is provided between the tooth portion 22 and each insulating member 400 in the X direction.

[0193] The pair of locking portions 412 are formed on both ends in the Z direction of the insulating member 400. Each locking portion 412 protrudes in the X direction toward the tooth portion 22, and is locked to the tooth portion 22 from the Z direction.

[0194] In this way, when the insulator 16 is configured to have a pair of insulating members 400, there is no need to ensure a creepage distance at the dividing portion, as is the case, for example, when the insulator 16 is configured to be divided into two in the Z direction by a dividing portion set in the center of the tooth portion 22 in the Z direction.

[0195] Furthermore, since a gas layer 408 is provided between the teeth 22 and each insulating member 400 in the X direction, insulation from the winding winding portion 18 can be ensured without increasing the thickness of the insulating member 400, compared to, for example, a case in which the gas layer 408 is not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to a case in which the thickness of the insulating member 400 is increased.

[0196] Furthermore, each insulating member 400 has a step 410 that protrudes toward the tooth portion 22 and abuts against the side surface 22A of the tooth portion 22, thereby increasing the support rigidity of the insulating member 400 with respect to the tooth portion 22. This makes it possible to prevent the insulating member 400 from bending due to the tightening force of the winding portion 18, thereby preventing the gas layer 408 from shrinking.

[0197] Furthermore, since each insulating member 400 has a locking portion 412 that protrudes in the X direction and is locked to the tooth portion 22 from the Z direction, the locking portion 412 can be locked to the tooth portion 22 from the Z direction, thereby improving the ease of assembling the insulating member 400 to the tooth portion 22.

[0198] As shown in Figures 65 to 67, the pair of insulating members 400 may have a portion that covers the core back portion 20 from the Z direction, in addition to a portion that covers the tooth portion 22 from the X direction and the Z direction.

[0199] Twentieth Embodiment Next, a twentieth embodiment of the technique of the present disclosure will be described.

[0200] In the twentieth embodiment, the configuration of the insulator 16 is modified as follows from the sixteenth embodiment. That is, as shown in Fig. 68 , the insulator 16 is formed in a continuous ring shape around the Y direction so as to surround the tooth portion 22. For example, the insulator 16 is formed from a molded resin and is provided integrally with the tooth portion 22. The tooth portion 22 is formed in a straight shape in the radial direction of the stator core 24 so that it can be inserted inside the ring-shaped insulator 16.

[0201] The insulator 16 has a pair of first insulating portions 420 and a pair of second insulating portions 422. The pair of first insulating portions 420 are an example of a "pair of insulating portions" and a "pair of first insulating portions" in the technology of the present disclosure, and the pair of second insulating portions 422 are an example of a "pair of second insulating portions" in the technology of the present disclosure.

[0202] The pair of first insulating portions 420 each extend in the Z direction. The pair of first insulating portions 420 are arranged on both sides of the tooth portion 22 in the X direction, and cover the side surfaces 22A of the tooth portion 22 on both sides in the X direction. The pair of second insulating portions 422 each extend in the X direction. The pair of second insulating portions 422 are arranged on both sides of the tooth portion 22 in the Z direction, and cover the end surfaces 22B of the tooth portion 22 on both sides in the Z direction.

[0203] Each first insulating portion 420 has a pair of protruding portions 424. The pair of protruding portions 424 is formed on both ends of the first insulating portion 420 in the Z direction. Each protruding portion 424 protrudes in the X direction opposite the tooth portion 22 and abuts against the winding portion 18. The abutment of each protruding portion 424 against the winding portion 18 provides a gas layer 428 between the second insulating portion 422 and the winding portion 18. The gas layer 428 is an example of a "first gas layer" according to the technology of the present disclosure.

[0204] In this way, when the insulator 16 is formed in a continuous ring shape around the Y direction to surround the tooth portion 22, there is no need to ensure a creepage distance at the dividing portion, as is the case, for example, when the insulator 16 is configured to be divided into two in the Z direction by a dividing portion set in the center of the tooth portion 22 in the Z direction.

[0205] Furthermore, compared to when the insulator 16 is divided into multiple members by a dividing portion, it is possible to prevent the occurrence of a creepage distance along the dividing portion, which eliminates the need to add a structure to the insulator 16 for increasing the creepage distance, thereby simplifying the configuration of the insulator 16.

[0206] Furthermore, since the gas layer 428 is provided between the tooth portion 22 and each first insulating portion 420 in the X direction, insulation from the winding winding portion 18 can be ensured without thickening the first insulating portion 420, compared to, for example, a case where the gas layer 428 is not provided. As a result, insulation from the winding winding portion 18 can be ensured without reducing the space factor of the winding winding portion 18, compared to a case where the first insulating portion 420 is thickened.

[0207] 69 , the insulator 16 may be configured with a pair of first insulating portions 420 and a pair of second insulating portions 422 partially provided around the tooth portion 22. Furthermore, the number of insulating portions 432 constituting each second insulating portion 422 may be any number.

[0208] Furthermore, among the configurations described in the first to twentieth embodiments, configurations that can be combined may be combined as appropriate.

[0209] The above describes one embodiment of the technology of the present disclosure, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modifications within the scope of the gist of the present disclosure.

[0210] The following are supplementary notes regarding the technology of the present disclosure. (Supplementary Note 1) A stator (10) comprising: a stator core (24) having a plurality of radially extending tooth portions (22), a plurality of insulators (16) attached to the plurality of tooth portions, and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions (32, 330, 350, 380, 400) arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer (50, 52, 170, 270, 338, 358, 388, 408) and the insulating portions are provided between the tooth portions and the winding winding portions in the tangential direction of the stator core. (Supplementary Note 2) The stator according to Supplementary Note 1, wherein the insulator is divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion (40, 140, 240), the first insulator and the second insulator have an overlap structure in which a first overlap portion (56, 156, 256) formed on the first insulator overlaps with a second overlap portion (58, 158, 258) formed on the second insulator, and the dividing portion is formed between the first overlap portion and the second overlap portion.(Supplementary Note 3) A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators are divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion (40, 140, 240), the first insulator and the second insulator have an overlap structure in which a first overlap portion (56, 156, 256) formed on the first insulator and a second overlap portion (58, 158, 258) formed on the second insulator overlap, and the dividing portion is formed between the first overlap portion and the second overlap portion. (Supplementary Note 4) The stator according to Supplementary Note 2 or Supplementary Note 3, wherein a third gas layer (50, 52, 150, 152, 170, 250, 270) is provided between the insulator and the teeth portion, the third gas layer having a first gas layer (50, 150) provided between the first insulator and the teeth portion, and a second gas layer (52, 152) provided between the second insulator and the teeth portion, and the dividing portion is formed in a resin portion (54, 154) between the first gas layer and the second gas layer in the insulator. (Supplementary Note 5) The stator according to Supplementary Note 4, wherein the dividing portion is connected to the third gas layer. (Supplementary Note 6) The stator according to any one of Supplementary Note 2 to Supplementary Note 5, wherein the first insulator has a first dividing surface (64, 164, 264) that forms the dividing portion, the second insulator has a second dividing surface (66, 166, 266) that forms the dividing portion, and at least one of the first dividing surface and the second dividing surface includes an inclined surface (64C, 66C, 164D, 166D, 164E, 166E) that is inclined with respect to the axial direction of the stator core or the tangential direction of the stator core.(Supplementary Note 7) The insulator is divided into the first insulator and the second insulator in the axial direction of the stator core by the dividing portion, the first insulator has: a first insulating portion (30) arranged on one side of the tooth portion in the axial direction of the stator core; and a pair of second insulating portions (32A) arranged on both sides of the tooth portion in the tangential direction of the stator core, the second insulator has: a third insulating portion (30) arranged on the other side of the tooth portion in the axial direction of the stator core; and a pair of fourth insulating portions (32B) arranged on both sides of the tooth portion in the tangential direction of the stator core, the pair of second insulating portions are tapered so that the width between them increases toward the other side in the axial direction of the stator core before being attached to the tooth portion, and the pair of fourth insulating portions are tapered so that the width between them increases toward one side in the axial direction of the stator core before being attached to the tooth portion, the pair of second insulating portions and the pair of fourth insulating portions are pressed toward the tooth portion by the winding winding portion after being attached to the tooth portion.(Supplementary Note 8) The insulator is divided into the first insulator and the second insulator by the dividing portion in a tangential direction of the stator core, the first insulator has: a first insulating portion (32) arranged on one side of the tooth portion in the tangential direction of the stator core; and a pair of second insulating portions (30A) arranged on both sides of the tooth portion in the axial direction of the stator core, the second insulator has: a third insulating portion (32) arranged on the other side of the tooth portion in the tangential direction of the stator core; and a pair of fourth insulating portions (30B) arranged on both sides of the tooth portion in the axial direction of the stator core, and the pair of second insulating portions are tapered so that the width therebetween increases toward the other side in the tangential direction of the stator core before being attached to the tooth portion, The stator according to any one of Supplementary notes 2 to 6, wherein the pair of fourth insulating portions are tapered so that a width between them increases toward one side in a tangential direction of the stator core before being attached to the tooth portion, and the pair of second insulating portions and the pair of fourth insulating portions are pressed toward the tooth portion by the winding winding portion after being attached to the tooth portion. (Supplementary Note 9) The stator according to any one of Supplementary Notes 2 to 6, wherein the insulator is divided into the first insulator and the second insulator in the axial direction of the stator core by the dividing portion, the first overlap portion (56) extends toward the other side in the axial direction of the stator core, the second overlap portion (58) extends toward one side in the axial direction of the stator core, and a tip (56A) of the first overlap portion or a tip (58A) of the second overlap portion is inclined with respect to the radial direction of the stator core when viewed from a tangential direction of the stator core.(Supplementary Note 10) The stator according to any one of Supplementary Notes 2 to 6, wherein the insulator is divided into the first insulator and the second insulator by the dividing portion in a tangential direction of the stator core, the first overlap portion (156) extends toward the other side in the tangential direction of the stator core, the second overlap portion (158) extends toward one side in the tangential direction of the stator core, and a tip (156A) of the first overlap portion or a tip (158A) of the second overlap portion is inclined with respect to the radial direction of the stator core when viewed from the axial direction of the stator core. (Supplementary Note 11) The stator according to Supplementary Note 4, wherein the insulator has a pair of first insulating portions (30) arranged on both sides of the tooth portion in the axial direction of the stator core and a pair of second insulating portions (32) arranged on both sides of the tooth portion in the tangential direction of the stator core, the dividing portion is formed between the first insulating portion and the second insulating portion, and the gas layer has at least one of a gas layer (250) provided between the first insulating portion and the tooth portion in the axial direction of the stator core and a gas layer (270) provided between the second insulating portion and the tooth portion in the tangential direction of the stator core. (Supplementary Note 12) The stator according to Supplementary Note 1, wherein the insulator is divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion, and the first insulator and the second insulator are in close contact at the dividing portion. (Supplementary Note 13) A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators are divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion, and the first insulator and the second insulator are in close contact with each other at the dividing portion.(Supplementary Note 14) The stator according to Supplementary Note 12 or Supplementary Note 13, wherein a first gas layer (50, 150) is provided between the first insulator and the teeth, a second gas layer (52, 152) is provided between the second insulator and the teeth, and the dividing portion is formed in a resin portion (54, 154) between the first gas layer and the second gas layer in the insulator. (Supplementary Note 15) The stator according to Supplementary Note 1, wherein the gas layer (338, 358, 388, 408) is provided between the teeth and the insulating portion in a tangential direction of the stator core. (Supplementary Note 16) A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions (330, 350, 380, 400) arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer (338, 358, 388, 408) is provided between the tooth portions and the insulating portions in the tangential direction of the stator core. (Supplementary Note 17) The stator according to Supplementary Note 15 or Supplementary Note 16, wherein the insulator has a pair of first insulating portions (330) as the pair of insulating portions, and a pair of second insulating portions (332) extending in a tangential direction of the stator core and arranged on both sides of the tooth portion in the axial direction of the stator core, wherein the first insulating portions have fitting portions (334), and the second insulating portions have fitted portions (336) fitted with the fitting portions. (Supplementary Note 18) The stator according to Supplementary Note 17, wherein the fitting portions are formed in a convex shape, and the fitted portions are formed in a concave shape. (Supplementary Note 19) The stator according to Supplementary Note 17 or Supplementary Note 18, wherein the fitting portions have abutting portions (340) that abut against the tooth portion.(Supplementary Note 20) The stator according to any one of Supplementary Notes 17 to 19, wherein the fitting portion is formed with locking portions (342) that protrude in a tangential direction of the stator core and are locked to the tooth portions from the axial direction of the stator core. (Supplementary Note 21) The stator according to Supplementary Note 15 or Supplementary Note 16, wherein the insulator is formed in a continuous ring shape around the radial direction of the stator core so as to surround the tooth portions, and has: a pair of first insulating portions (350) as the pair of insulating portions; and a pair of second insulating portions (352) that extend in a tangential direction of the stator core and are arranged on both sides of the tooth portions in the axial direction of the stator core. (Supplementary Note 22) The stator according to Supplementary Note 21, wherein the first insulating portions have abutting portions (360, 364) that abut against the tooth portions. (Supplementary Note 23) The stator according to Supplementary Note 22, wherein the abutment portion has a step portion (360) formed at an end of the first insulating portion in the axial direction of the stator core. (Supplementary Note 24) The stator according to Supplementary Note 22 or Supplementary Note 23, wherein the abutment portion has a protrusion portion (364) formed at a central portion of the insulating portion in the axial direction of the stator core. (Appendix 25) The stator according to Appendix 24, wherein the protrusion is formed by a part of the first insulating portion protruding toward the tooth portion, a recess (366) opening toward the winding winding portion is formed in a portion of the first insulating portion corresponding to the protrusion, the gas layer (358) is divided into a plurality of first gas layers (368) in the axial direction of the stator core by the protrusion, a second gas layer (370) is provided by the recess between the winding winding portion and the first insulating portion in the tangential direction of the stator core, and the plurality of first gas layers and the second gas layer are staggered.(Supplementary Note 26) The stator according to Supplementary Note 15 or Supplementary Note 16, wherein the insulator has: a pair of first insulating portions (380) as the pair of insulating portions, a second insulating portion (382) extending in a tangential direction of the stator core, arranged on one side of the tooth portion in the axial direction of the stator core, and connecting the pair of first insulating portions, and a pair of protruding portions (384) protruding to opposite sides from ends of the first insulating portions on the opposite side to the second insulating portions, and arranged on the other side of the tooth portion in the axial direction of the stator core. (Supplementary Note 27) The stator according to Supplementary Note 15 or Supplementary Note 16, wherein the insulating portion (400) has a contact portion (410) that abuts against the tooth portion and forms a gas layer (408) between the tooth portion and the insulating portion in the tangential direction of the stator core. (Supplementary Note 28) The insulator has a pair of first insulating portions (420) extending in the axial direction of the stator core and arranged on both sides of the tooth portion in the tangential direction of the stator core, and a first gas layer (428) is provided between the winding winding portion and the first insulating portion in the tangential direction of the stator core. A stator according to Supplementary Note 1 (Supplementary Note 29) The stator comprises: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulator has a pair of first insulating portions (420) extending in the axial direction of the stator core and arranged on both sides of the tooth portion in the tangential direction of the stator core, A stator, wherein a first gas layer (428) is provided between the winding portion and the first insulating portion in the tangential direction of the stator core.(Supplementary Note 30) The stator according to Supplementary Note 28 or Supplementary Note 29, wherein the insulator has a pair of the first insulating portions (420), and a pair of second insulating portions (422) extending in a tangential direction of the stator core and arranged on both sides of the tooth portion in the axial direction of the stator core, and the second insulating portions have protrusions (424) that protrude in the tangential direction of the stator core and abut against the winding winding portion, and form the first gas layer between the second insulating portion and the winding winding portion in the tangential direction of the stator core. (Supplementary Note 31) The stator according to Supplementary Note 28 or Supplementary Note 29, wherein the insulator is formed in a continuous annular shape around the radial direction of the stator core so as to surround the tooth portion. (Supplementary Note 32) The stator according to Supplementary Note 28 or Supplementary Note 29, wherein the insulator is provided partially around the tooth portion. (Supplementary Note 33) A rotating electric machine (M) comprising: the stator according to any one of Supplementary Note 1 to Supplementary Note 32; and a rotor (11) rotatably disposed inside the stator.

Claims

1. A stator (10) comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions (32, 330, 350, 380, 400) arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer (50, 52, 170, 270, 338, 358, 388, 408) and the insulating portions are provided between the tooth portions and the winding winding portions in the tangential direction of the stator core.

2. A stator according to claim 1, wherein the insulator is divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion (40, 140, 240), the first insulator and the second insulator have an overlap structure in which a first overlap portion (56, 156, 256) formed on the first insulator overlaps with a second overlap portion (58, 158, 258) formed on the second insulator, and the dividing portion is formed between the first overlap portion and the second overlap portion.

3. A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators are divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion (40, 140, 240), the first insulator and the second insulator have an overlap structure in which a first overlap portion (56, 156, 256) formed on the first insulator and a second overlap portion (58, 158, 258) formed on the second insulator overlap, and the dividing portion is formed between the first overlap portion and the second overlap portion.

4. A stator as set forth in claim 2 or claim 3, wherein a third gas layer (50, 52, 150, 152, 170, 250, 270) is provided between the insulator and the teeth portion, the third gas layer comprising: a first gas layer (50, 150) provided between the first insulator and the teeth portion; and a second gas layer (52, 152) provided between the second insulator and the teeth portion, and the dividing portion is formed in a resin portion (54, 154) in the insulator between the first gas layer and the second gas layer.

5. The stator according to claim 4, wherein the dividing portion is connected to the third gas layer.

6. A stator as set forth in any one of claims 2 to 5, wherein the first insulator has a first dividing surface (64, 164, 264) that forms the dividing portion, the second insulator has a second dividing surface (66, 166, 266) that forms the dividing portion, and at least one of the first dividing surface and the second dividing surface includes an inclined surface (64C, 66C, 164D, 166D, 164E, 166E) that is inclined relative to the axial direction of the stator core or the tangential direction of the stator core.

7. The insulator is divided into the first insulator and the second insulator in the axial direction of the stator core by the dividing portion, the first insulator having a first insulating portion (30) arranged on one side of the tooth portion in the axial direction of the stator core, and a pair of second insulating portions (32A) arranged on both sides of the tooth portion in the tangential direction of the stator core, the second insulator having a third insulating portion (30) arranged on the other side of the tooth portion in the axial direction of the stator core, and a pair of fourth insulating portions (32B) arranged on both sides of the tooth portion in the tangential direction of the stator core, the pair of second insulating portions being tapered so that the width between them increases toward the other side in the axial direction of the stator core before being attached to the tooth portion, and the pair of fourth insulating portions being tapered so that the width between them increases toward one side in the axial direction of the stator core before being attached to the tooth portion, 7. The stator according to claim 2, wherein the pair of second insulating portions and the pair of fourth insulating portions are pressed toward the tooth portion by the winding winding portion after being attached to the tooth portion.

8. The insulator is divided into the first insulator and the second insulator by the dividing portion in a tangential direction of the stator core, the first insulator having a first insulating portion (32) arranged on one side of the tooth portion in the tangential direction of the stator core, and a pair of second insulating portions (30A) arranged on both sides of the tooth portion in the axial direction of the stator core, the second insulator having a third insulating portion (32) arranged on the other side of the tooth portion in the tangential direction of the stator core, and a pair of fourth insulating portions (30B) arranged on both sides of the tooth portion in the axial direction of the stator core, and the pair of second insulating portions are tapered so that the width between them increases toward the other side in the tangential direction of the stator core before being attached to the tooth portion, 7. The stator according to claim 2, wherein the pair of fourth insulating portions are tapered so that the width between them increases toward one side in the tangential direction of the stator core before being attached to the tooth portion, and the pair of second insulating portions and the pair of fourth insulating portions are pressed toward the tooth portion by the winding winding portion after being attached to the tooth portion.

9. A stator as set forth in any one of claims 2 to 6, wherein the insulator is divided into the first insulator and the second insulator in the axial direction of the stator core by the dividing portion, the first overlap portion (56) extends toward the other side in the axial direction of the stator core, the second overlap portion (58) extends toward one side in the axial direction of the stator core, and a tip (56A) of the first overlap portion or a tip (58A) of the second overlap portion is inclined with respect to the radial direction of the stator core when viewed from a tangential direction of the stator core.

10. A stator as described in any one of claims 2 to 6, wherein the insulator is divided into the first insulator and the second insulator by the dividing portion in the tangential direction of the stator core, the first overlap portion (156) extends toward the other side in the tangential direction of the stator core, the second overlap portion (158) extends toward one side in the tangential direction of the stator core, and a tip (156A) of the first overlap portion or a tip (158A) of the second overlap portion is inclined relative to the radial direction of the stator core when viewed in the axial direction of the stator core.

11. A stator as set forth in claim 4, wherein the insulator has a pair of first insulating portions (30) arranged on both sides of the tooth portion in the axial direction of the stator core, and a pair of second insulating portions (32) arranged on both sides of the tooth portion in the tangential direction of the stator core, the dividing portion is formed between the first insulating portion and the second insulating portion, and the third gas layer has at least one of a gas layer (250) provided between the first insulating portion and the tooth portion in the axial direction of the stator core and a gas layer (270) provided between the second insulating portion and the tooth portion in the tangential direction of the stator core.

12. A stator according to claim 1, wherein the insulator is divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion, and the first insulator and the second insulator are in close contact with each other at the dividing portion.

13. A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators are divided into a first insulator (42, 142, 242) and a second insulator (44, 144, 244) by a dividing portion, and the first insulator and the second insulator are in close contact with each other at the dividing portion.

14. A stator as set forth in claim 12 or claim 13, wherein a first gas layer (50, 150) is provided between the first insulator and the teeth portion, a second gas layer (52, 152) is provided between the second insulator and the teeth portion, and the dividing portion is formed in a resin portion (54, 154) between the first gas layer and the second gas layer in the insulator.

15. A stator according to claim 1, wherein the gas layer (338, 358, 388, 408) is provided between the teeth portion and the insulating portion in the tangential direction of the stator core.

16. A stator comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of insulating portions (330, 350, 380, 400) arranged on both sides of the tooth portions in a tangential direction of the stator core, and a gas layer (338, 358, 388, 408) is provided between the tooth portions and the insulating portions in the tangential direction of the stator core.

17. A stator as described in claim 15 or claim 16, wherein the insulator has a pair of first insulating portions (330) as the pair of insulating portions, and a pair of second insulating portions (332) extending in the tangential direction of the stator core and arranged on both sides of the teeth portion in the axial direction of the stator core, wherein the first insulating portions have fitting portions (334), and the second insulating portions have fitted portions (336) fitted with the fitting portions.

18. The stator according to claim 17, wherein the fitting portion is formed in a convex shape, and the fitted portion is formed in a concave shape.

19. A stator according to claim 17 or claim 18, wherein the fitting portion has an abutment portion (340) that abuts against the tooth portion.

20. A stator as set forth in any one of claims 17 to 19, wherein the fitting portion is formed with a locking portion (342) that protrudes in the tangential direction of the stator core and is locked to the tooth portion from the axial direction of the stator core.

21. A stator as set forth in claim 15 or claim 16, wherein the insulator is formed in a continuous ring shape around the radial direction of the stator core so as to surround the tooth portion, and has a pair of first insulating portions (350) as the pair of insulating portions, and a pair of second insulating portions (352) extending in the tangential direction of the stator core and arranged on both sides of the tooth portion in the axial direction of the stator core.

22. A stator according to claim 21, wherein the first insulating portion has abutting portions (360, 364) that abut against the teeth portions.

23. A stator according to claim 22, wherein the abutment portion has a step (360) formed at an end of the first insulating portion in the axial direction of the stator core.

24. A stator according to claim 22 or 23, wherein the abutment portion has a protrusion (364) formed in the center of the insulating portion in the axial direction of the stator core.

25. A stator as set forth in claim 24, wherein the protrusion is formed by a part of the first insulating portion protruding toward the tooth portion, a recess (366) opening toward the winding winding portion is formed in a portion of the first insulating portion corresponding to the protrusion, the gas layer (358) is divided into a plurality of first gas layers (368) in the axial direction of the stator core by the protrusion, a second gas layer (370) is provided by the recess between the winding winding portion and the first insulating portion in the tangential direction of the stator core, and the plurality of first gas layers and the second gas layer are staggered.

26. A stator according to claim 15 or claim 16, wherein the insulator comprises: a pair of first insulating portions (380) as the pair of insulating portions; a second insulating portion (382) extending in the tangential direction of the stator core, arranged on one side of the teeth in the axial direction of the stator core, and connecting the pair of first insulating portions; and a pair of protruding portions (384) protruding to opposite sides from ends of the first insulating portions opposite the second insulating portions, and arranged on the other side of the teeth in the axial direction of the stator core.

27. A stator according to claim 15 or claim 16, wherein the insulating portion (400) has an abutment portion (410) that abuts against the tooth portion and forms a gas layer (408) between the tooth portion and the insulating portion in the tangential direction of the stator core.

28. The stator according to claim 1, wherein the insulator has a pair of first insulating portions (420) extending in the axial direction of the stator core and arranged on both sides of the tooth portion in the tangential direction of the stator core, and a first gas layer (428) is provided between the winding winding portion and the first insulating portion in the tangential direction of the stator core.

29. A stator (10) comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulators (16) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions via the insulators, wherein the insulators extend in the axial direction of the stator core and have a pair of first insulating portions (420) arranged on both sides of the tooth portions in a tangential direction of the stator core, and a first gas layer (428) is provided between the winding winding portions and the first insulating portions in the tangential direction of the stator core.

30. A stator as described in claim 28 or claim 29, wherein the insulator has a pair of the first insulating portions (420) and a pair of second insulating portions (422) extending in a tangential direction of the stator core and arranged on both sides of the tooth portion in the axial direction of the stator core, and the second insulating portions have protruding portions (424) that protrude in the tangential direction of the stator core and abut against the winding winding portion, and form the first gas layer between the second insulating portion and the winding winding portion in the tangential direction of the stator core.

31. A stator according to claim 28 or 29, wherein the insulator is formed in a continuous ring shape around the stator core in the radial direction so as to surround the teeth portion.

32. A stator according to claim 28 or 29, wherein the insulator is provided partially around the teeth portion.

33. A rotating electric machine (M) comprising: a stator according to any one of claims 1 to 32; and a rotor (11) rotatably arranged inside the stator.

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