Stator

Abstract

This stator (10) comprises: a stator core (24) which has a plurality of teeth (22); a plurality of insulators (16) which are mounted on the plurality of teeth; and a plurality of wire windings (18) which are wound around the plurality of teeth with the insulators in between. Each insulator has an insulating member (30) that insulates the tooth from the axial direction of the stator core, and an insulating sheet (32) that insulates the tooth from the tangential direction of the stator core. The insulating member has a first overlap portion (36). The insulating sheet has a second overlap portion (38) that overlaps the first overlap portion in the axial direction of the stator core. Each tooth has a third overlap portion (40) that overlaps the first overlap portion and the second overlap portion in the axial direction of the stator core.

Description

Stator CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2024-112937, filed on July 12, 2024, the entire contents of which are incorporated herein by reference.

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

[0003] Conventionally, there has been a stator including a stator core having a plurality of radially extending teeth, a plurality of insulators attached to the plurality of teeth, and a plurality of windings wound around the plurality of teeth via the insulators. Among these types of stators, there is one in which each insulator has an insulating member that insulates the teeth from the axial direction of the stator core and an insulating sheet that insulates the teeth from the tangential direction of the stator core (see, for example, International Publication No. 2018 / 017030). In this stator, in order to ensure a creepage distance along the insulator from the windings to the teeth, the insulating member has a first overlap portion extending in the axial direction of the stator core, and the insulating sheet has a second overlap portion extending opposite the first overlap portion and overlapping with the first overlap portion in the axial direction of the stator core.

[0004] As a result of detailed investigations by the inventors, the following problem was discovered: In the above-described stator, the first overlap portion of the insulating member and the second overlap portion of the insulating sheet are arranged alongside the teeth in the axial direction of the stator core, which may increase the axial length of the stator.

[0005] The technique of the present disclosure provides a stator that can reduce the axial length while ensuring a creepage distance along the insulator from the winding portion to the teeth portion, compared to conventional stators.

[0006] One aspect of the technology disclosed herein 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 each of the insulators, wherein each of the insulators has an insulating member that insulates the tooth portion from the axial direction of the stator core and an insulating sheet that insulates the tooth portion from the tangential direction of the stator core, wherein the insulating member has a first overlap portion extending in the axial direction of the stator core, the insulating sheet has a second overlap portion extending opposite to the first overlap portion and overlapping with the first overlap portion in the axial direction of the stator core, and the tooth portion has a third overlap portion overlapping with the first overlap portion and the second overlap portion in the axial direction of the stator core.

[0007] According to the technique of the present disclosure, a stator is provided that can reduce the axial length while ensuring a creepage distance along the insulator from the winding winding portion to the teeth portion, compared to conventional stators.

[0008] 1 is a plan view showing an example of a stator. FIG. 2 is a perspective view showing an example of a stator component. FIG. 3 is a perspective view showing an example of a core member and an insulator. FIG. 4 is an exploded perspective view showing an example of a core member and an insulator. FIG. 5 is a longitudinal sectional view of a stator component according to the first embodiment. FIG. 6 is an enlarged side view of a main part of the stator component according to the first embodiment. FIG. 7 is a diagram comparing the stator component according to the first embodiment with a stator component according to a comparative example. FIG. 8 is a longitudinal sectional view of a stator component according to the second embodiment. FIG. 9 is a longitudinal sectional view of a stator component according to the third embodiment. FIG. 10 is a longitudinal sectional view of a stator component according to the fourth embodiment. FIG. 11 is an enlarged side view of a main part of the stator component according to the fourth embodiment. FIG. 12 is a longitudinal sectional view of a stator component according to the fifth embodiment. FIG. 13 is an enlarged side view of a main part of the stator component according to the fifth embodiment. FIG. 14 is a diagram comparing the stator component according to the fifth embodiment, a stator component according to a comparative example, and the stator component according to the first embodiment. FIG. 15 is a longitudinal sectional view of a stator component according to a modified example of the sixth embodiment. FIG. 16 is a longitudinal sectional view of a stator component according to a modified example of the sixth embodiment. FIG. 17 is a longitudinal sectional view of a stator component according to a modified example of the seventh embodiment. FIG. 18 is a longitudinal sectional view of a stator component according to a first modified example of the seventh embodiment. Fig. 13 is a longitudinal sectional view of a stator component according to a second modified example of the seventh embodiment; Fig. 14 is a longitudinal sectional view of a stator component according to a third modified example of the seventh embodiment; Fig. 15 is a longitudinal sectional view of a stator component according to an eighth embodiment; Fig. 16 is an enlarged side view of a main part of the stator component according to the eighth embodiment;

[0009] [Example of Stator 10] First, an example of the stator 10 will be described.

[0010] As shown in Fig. 1, 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.

[0011] 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.

[0012] 1 and 2 , 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. The core member 14 is a laminate in which multiple core sheets are stacked in the Z direction.

[0013] 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 (see FIG. 1) are formed between the plurality of teeth portions 22.

[0014] 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 insulate the core member 14 (more specifically, the core back portion 20 and the tooth portions 22) from the winding winding portions 18. The winding winding portions 18 are wound around the tooth portions 22 via the insulators 16. The winding winding portions 18 are formed by winding a wire around the tooth portions 22 in the Y direction.

[0015] 2 to 4, the insulator 16 has a pair of insulating members 30 and a pair of insulating sheets 32. The pair of insulating members 30 are attached to the core member 14 from both sides in the Z direction. The pair of insulating sheets 32 are disposed between the pair of insulating members 30 in the Z direction. The pair of insulating sheets 32 are attached to the core member 14 from both sides in the X direction. In the first to eighth embodiments described below, the stator 10 is configured as follows compared to the example shown in FIGS. 1 to 4.

[0016] First Embodiment Next, a stator 10 according to a first embodiment of the technology of the present disclosure will be described.

[0017] 5, the stator component 12 is symmetrical in both the X and Z directions. Below, the configuration of one side of the stator component 12 in the X direction and one side of the stator component 12 in the Z direction will be described, and a description of the configuration of the other side of the stator component 12 in the X direction and the other side of the stator component 12 in the Z direction will be omitted.

[0018] Each tooth 22 has an end face 22A facing the Z direction and a side face 22B facing the X direction. The end face 22A extends in the X direction and the Y direction, and the side face 22B extends in the Z direction and the Y direction. The width of each tooth 22 along the X direction is constant throughout the Z direction. That is, each tooth 22 is formed in a quadrangular shape when viewed from the Y direction.

[0019] The insulating member 30 is a resin part formed by resin molding. The insulating member 30 insulates the tooth portion 22 from the Z direction. Specifically, the insulating member 30 covers the end face 22A of the tooth portion 22 from the Z direction, insulating the end face 22A from the winding portion 18. The insulating sheet 32 ​​is a resin sheet material formed into a sheet shape. The insulating sheet 32 ​​insulates the tooth portion 22 from the X direction. Specifically, the insulating member 30 covers the side face 22B of the tooth portion 22, insulating the side face 22B from the winding portion 18.

[0020] Specifically, the insulating member 30 has an insulating portion 34. The insulating portion 34 is disposed between the end face 22A in the Z direction and the winding winding portion 18, and insulates the end face 22A from the winding winding portion 18. A corner 34A of the insulating portion 34 between the end face in the Z direction and the side face in the X direction is formed by a curved surface.

[0021] The insulating member 30 has a first overlap portion 36, and the insulating sheet 32 ​​has a second overlap portion 38. The first overlap portion 36 extends in the Z direction from the X-direction end of the insulating portion 34 along the side surface 22B toward the side away from the end surface 22A. The base end of the first overlap portion 36 is connected to the insulating portion 34, and the tip end of the first overlap portion 36 is located on the opposite side of the base end of the first overlap portion 36 from the end surface 22A in the Z direction. The base end of the first overlap portion 36 corresponds to the tip end of the second overlap portion 38. The first overlap portion 36 covers a portion of the side surface 22B on the end surface 22A side. The first overlap portion 36 is disposed between the side surface 22B and the second overlap portion 38 in the X direction.

[0022] The second overlap portion 38 is formed by a portion of the insulating sheet 32 ​​on the end surface 22A side. The second overlap portion 38 extends in the opposite direction from the first overlap portion 36. The tip end of the second overlap portion 38 is located on the end surface 22A side of the base end of the second overlap portion 38 in the Z direction. The base end of the second overlap portion 38 corresponds to the tip end of the first overlap portion 36. The second overlap portion 38 overlaps the first overlap portion 36 in the Z direction. By overlapping the second overlap portion 38 with the first overlap portion 36 in the Z direction, it is possible to ensure a creepage distance along the insulator 16 (specifically, the first overlap portion 36 and the second overlap portion 38) from the winding winding portion 18 to the tooth portion 22.

[0023] The tooth portion 22 has a third overlap portion 40 that overlaps the first overlap portion 36 and the second overlap portion 38 in the Z direction. That is, a portion of the tooth portion 22 on the end face 22A side is formed as the third overlap portion 40. The tooth portion 22 (specifically, the third overlap portion 40) also has a protrusion 42 that protrudes in the Z direction beyond the tip end of the second overlap portion 38. The protrusion 42 protrudes toward the end face 22A beyond the tip end of the second overlap portion 38.

[0024] A gas layer 44 is provided between the side surface 22B and the insulating sheet 32 ​​in the X direction by supporting the insulating sheet 32 ​​on the side surface 22B via the first overlap portions 36. That is, the space surrounded by the side surface 22B, the pair of first overlap portions 36 on both sides in the Z direction, and the portion of the insulating sheet 32 ​​between the pair of second overlap portions 38 on both sides in the Z direction is formed as the gas layer 44. The gas layer 44 is an example of a "first gas layer" according to the technology of the present disclosure.

[0025] 6, an insulating sheet 32 ​​is disposed between the winding portion 18 and the core back portion 20 in the Y direction. A first overlap portion 36 is interposed between the insulating sheet 32 ​​and the core back portion 20 in the Y direction, thereby providing a gas layer 45. The gas layer 45 is an example of a "second gas layer" according to the technology of the present disclosure.

[0026] A comparative example will now be described. As shown in Fig. 7 , the comparative example is similar to the first embodiment in that the insulating member 30 has a first overlap portion 36 and the insulating sheet 32 ​​has a second overlap portion 38, but the first overlap portion 36 and the second overlap portion 38 are arranged side by side with the teeth 22 in the Z direction. When the first overlap portion 36 and the second overlap portion 38 are arranged side by side with the teeth 22 in the Z direction in this way, the axial length of the stator 10 increases.

[0027] In contrast, in the first embodiment, the insulating member 30 has a first overlap portion 36, the insulating sheet 32 ​​has a second overlap portion 38 that overlaps the first overlap portion 36 in the Z direction, and the tooth portions 22 have a third overlap portion 40 that overlaps the first overlap portion 36 and the second overlap portion 38 in the Z direction. That is, the first overlap portion 36 and the second overlap portion 38 overlap the tooth portions 22 in the Z direction. Therefore, according to the first embodiment, compared to the comparative example, the axial length of the stator 10 can be reduced while ensuring the creepage distance along the insulator 16 (specifically, the first overlap portion 36 and the second overlap portion 38) from the winding winding portion 18 to the tooth portions 22.

[0028] Furthermore, the width of the teeth 22 in the X direction is constant throughout the Z direction. Therefore, the multiple core sheets that form the core member 14 (see FIG. 4) can be made to have the same shape, which reduces costs compared to, for example, when the multiple core sheets include core sheets of different shapes.

[0029] Furthermore, a gas layer 44 (see FIG. 5 ) is provided between the side surface 22B in the X direction and the insulating sheet 32, as the insulating sheet 32 ​​is supported on the side surface 22B via the first overlap portion 36. Therefore, the provision of the gas layer 44 can improve the insulation between the tooth portion 22 and the winding winding portion 18.

[0030] Furthermore, the tooth portion 22 has a protrusion 42 that protrudes in the Z direction beyond the tip of the second overlap portion 38. Therefore, the protrusion 42 ensures a cross-sectional area of ​​the tooth portion 22 that can be used as a magnetic path, which also reduces the axial length of the stator 10.

[0031] In addition, a gas layer 45 (see FIG. 6 ) is provided between the insulating sheet 32 ​​and the core back portion 20 in the Y direction by the first overlap portion 36. Therefore, the provision of the gas layer 45 can improve the insulation between the core back portion 20 and the winding winding portion 18.

[0032] Second Embodiment Next, a stator 10 according to a second embodiment of the technology of the present disclosure will be described.

[0033] In the second embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, as shown in FIG. 8 , the tooth portion 22 has a main body portion 46 and a support portion 48. The support portion 48 is located on the insulating member 30 side of the main body portion 46 in the Z direction. The insulating member 30 is attached to the support portion 48 from the Z direction, and the support portion 48 supports the insulating member 30. The support portion 48 has a third overlap portion 40 and a protrusion 42. The support portion 48 is formed in a shape whose width in the X direction narrows toward the side away from the main body portion 46 in the Z direction. Specifically, the support portion 48 is formed in a trapezoidal shape when viewed in the Y direction.

[0034] In this way, when the support portion 48 is formed in a shape whose width in the X direction narrows toward the side away from the main body portion 46 in the Z direction, the support portion 48 can be brought closer to the winding winding portion 18 in the Z direction while preventing the corners 48A on the end face 22A side of the support portion 48 from interfering with the corners 18A of the winding winding portion 18. Therefore, since the support portion 48 can be brought closer to the winding winding portion 18 in the Z direction, the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be secured. Furthermore, because the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be secured, the axial length of the stator 10 can be reduced.

[0035] 8, the support portions 48 are formed in a trapezoidal shape when viewed in the Y direction, but may be formed in a shape other than a trapezoidal shape when viewed in the Y direction. For example, the support portions 48 may be formed in a semi-elliptical shape. Even with this configuration, the support portions 48 can be brought closer to the winding winding portions 18 in the Z direction, thereby ensuring a cross-sectional area of ​​the teeth 22 that can be used as a magnetic path. Furthermore, because the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be ensured, the axial length of the stator 10 can be reduced.

[0036] Third Embodiment Next, a stator 10 according to a third embodiment of the technology of the present disclosure will be described.

[0037] In the third embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, as shown in Fig. 9, the second overlap portion 38 is disposed on the opposite side of the side surface 22B from the first overlap portion 36 in the X direction. The insulating sheet 32 ​​has an extension portion 50 that extends from the tip end of the second overlap portion 38 to a position that covers the end surface 22A from the Z direction.

[0038] In this way, when the insulating sheet 32 ​​has an extension portion 50 that extends from the tip of the second overlap portion 38 to a position that covers the end face 22A from the Z direction, the extension portion 50 makes it possible to ensure a creepage distance along the insulator 16 (specifically, the first overlap portion 36, the second overlap portion 38, and the extension portion 50) from the winding winding portion 18 to the tooth portion 22.

[0039] Fourth Embodiment Next, a stator 10 according to a fourth embodiment of the technology of the present disclosure will be described.

[0040] In the fourth embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment: In the first embodiment, the first overlap portion 36 is disposed between the side surface 22B and the second overlap portion 38 in the X direction, and a gas layer 44 is provided between the side surface 22B and the insulating sheet 32 ​​in the X direction by supporting the insulating sheet 32 ​​on the side surface 22B via the first overlap portion 36.

[0041] In contrast, in the fourth embodiment, as shown in FIG. 10 , the second overlap portion 38 is disposed between the side surface 22B and the first overlap portion 36 in the X direction, and a gas layer 44 is provided between the winding winding portion 18 and the insulating sheet 32 ​​in the X direction by supporting the winding winding portion 18 on the insulating sheet 32 ​​via the first overlap portion 36.

[0042] 11 , an insulating sheet 32 ​​is disposed between the winding winding portion 18 and the core back portion 20 in the Y direction. A gas layer 45 is provided between the insulating sheet 32 ​​and the winding winding portion 18 in the Y direction by the first overlap portion 36 being interposed therebetween.

[0043] In the fourth embodiment, a gas layer 44 (see FIG. 10 ) is provided between the winding winding portion 18 and the insulating sheet 32 ​​in the X direction by supporting the winding winding portion 18 on the insulating sheet 32 ​​via the first overlap portion 36. Therefore, the provision of the gas layer 44 can improve the insulation between the teeth portion 22 and the winding winding portion 18.

[0044] Furthermore, a gas layer 45 (see FIG. 11 ) is provided between the insulating sheet 32 ​​and the winding winding portion 18 in the Y direction by the first overlap portion 36. Therefore, the provision of the gas layer 45 can improve the insulation between the core back portion 20 and the winding winding portion 18.

[0045] Fifth Embodiment Next, a stator 10 according to a fifth embodiment of the technology of the present disclosure will be described.

[0046] In the fifth embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, as shown in Fig. 12, the teeth 22 have a main body 46 and a stepped portion 52 located on the insulating member 30 side of the main body 46 in the Z direction. A step 54 is formed between the main body 46 and the stepped portion 52 in the Z direction, making the width of the teeth 22 along the X direction narrower at the stepped portion 52 than at the main body 46.

[0047] The insulating member 30 is attached to the stepped portion 52 from the Z direction, and the stepped portion 52 supports the insulating member 30. The stepped portion 52 has a third overlap portion 40 and a protruding portion 42. The width of the stepped portion 52 along the X direction is constant throughout the Z direction. That is, the stepped portion 52 is formed in a rectangular shape when viewed from the Y direction. The protruding portion 42 protrudes in the Z direction further than the tip end of the second overlap portion 38 and the base end of the first overlap portion 36. Specifically, the protruding portion 42 protrudes toward the end surface 22A further than the tip end of the second overlap portion 38 and the base end of the first overlap portion 36.

[0048] The insulating member 30 also has a protruding portion 56 that protrudes in the X direction. More specifically, the protruding portion 56 protrudes in the X direction from the end of the insulating portion 34 in the X direction (specifically, the base end of the first overlap portion 36). A gas layer 44 is provided between the winding winding portion 18 and the insulating sheet 32 ​​in the X direction by supporting the winding winding portion 18 on the protruding portion 56. In other words, the space surrounded by the insulating sheet 32, the pair of protruding portions 56 on both sides in the Z direction, and the portion of the winding winding portion 18 extending in the Z direction is formed as the gas layer 44.

[0049] 13 , an insulating sheet 32 ​​is disposed between the winding portion 18 and the core back portion 20 in the Y direction. A gas layer 45 is provided between the insulating sheet 32 ​​and the core back portion 20 in the Y direction.

[0050] In the fifth embodiment, steps 54 are formed in the teeth 22, and the width of the stepped portions 52 is narrower than the width of the main body 46. Therefore, as shown in Fig. 14, compared to the comparative example and the first embodiment, the corners 52A on the end faces 22A of the stepped portions 52 are prevented from interfering with the corners 18A of the winding portion 18, and the stepped portions 52 can be brought closer to the winding portion 18 in the Z direction. This allows the stepped portions 52 to be brought closer to the winding portion 18 in the Z direction, thereby ensuring a cross-sectional area of ​​the teeth 22 that can be used as a magnetic path. Furthermore, because the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be ensured, the axial length of the stator 10 can be reduced.

[0051] Furthermore, the stepped portion 52 has a third overlap portion 40 (see FIG. 12 ) that overlaps the first overlap portion 36 and the second overlap portion 38 in the Z direction. Therefore, it is possible to ensure a creepage distance along the insulator 16 (specifically, the first overlap portion 36 and the second overlap portion 38) from the winding winding portion 18 to the teeth portion 22 while reducing the axial length of the stator 10.

[0052] Furthermore, the stepped portion 52 has a protruding portion 42 (see FIG. 12 ) that protrudes in the Z direction beyond the tip of the second overlap portion 38. Therefore, the protruding portion 42 ensures a sufficient cross-sectional area of ​​the teeth portion 22 that can be used as a magnetic path, which also reduces the axial length of the stator 10.

[0053] Furthermore, the protrusions 42 protrude in the Z direction beyond the base end of the first overlap portion 36. This allows the cross-sectional area of ​​the teeth 22 that can be utilized as a magnetic path to be further secured, thereby further reducing the axial length of the stator 10.

[0054] Furthermore, a gas layer 44 (see FIG. 12 ) is provided between the winding portion 18 and the insulating sheet 32 ​​in the X direction because the winding portion 18 is supported by the protruding portion 56. Therefore, the provision of the gas layer 44 improves the insulation between the teeth 22 and the winding portion 18.

[0055] In addition, a gas layer 45 (see FIG. 13 ) is provided between the insulating sheet 32 ​​and the core back portion 20 in the Y direction. Therefore, the provision of the gas layer 45 can improve the insulation between the core back portion 20 and the winding winding portion 18.

[0056] Sixth Embodiment Next, a stator 10 according to a sixth embodiment of the technology of the present disclosure will be described.

[0057] In the sixth embodiment, the configuration of the stator 10 is modified as follows compared to the fifth embodiment. That is, as shown in Fig. 15 , the stepped portion 52 has a plurality of steps 54. In the example shown in Fig. 15 , the number of the steps 54 is two. The width of the stepped portion 52 along the X direction narrows for each step 54 toward the end face 22A.

[0058] In this way, when the stepped portion 52 has multiple steps 54, it is possible to bring the stepped portion 52 closer to the winding winding portion 18 in the Z direction while preventing the corners 52A on the end face 22A side of the stepped portion 52 from interfering with the corners 18A of the winding winding portion 18. Therefore, it is possible to ensure the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path, and it is possible to further reduce the axial length of the stator 10.

[0059] The stepped portion 52 may have any number of steps 54. For example, as shown in Fig. 16, the number of steps 54 may be three, or may be four or more.

[0060] Seventh Embodiment Next, a stator 10 according to a seventh embodiment of the technology of the present disclosure will be described.

[0061] In the seventh embodiment, the configuration of the stator 10 is modified as follows compared to the fifth embodiment. That is, as shown in Fig. 17, the stepped portion 52 is formed in a shape whose width along the X direction narrows toward the end face 22A. Specifically, the stepped portion 52 is formed in a trapezoidal shape when viewed from the Y direction.

[0062] In this way, when the stepped portion 52 is formed in a shape in which the width in the X direction narrows toward the end face 22A side, the corners 52A of the stepped portion 52 on the end face 22A side can be prevented from interfering with the corners 18A of the winding winding portion 18, and the stepped portion 52 can be brought even closer to the winding winding portion 18 in the Z direction. Therefore, the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be secured, and the axial length of the stator 10 can be further reduced.

[0063] In the example shown in FIG. 17 , the stepped portion 52 is generally trapezoidal when viewed from the Y direction. However, as shown in FIG. 18 , a step 54 may be formed between the protruding portion 42 of the stepped portion 52 and the third overlap portion 40, and only the protruding portion 42 of the stepped portion 52 may be trapezoidal when viewed from the Y direction. The protruding portion 42 may also be formed in a shape other than trapezoidal when viewed from the Y direction. For example, the protruding portion 42 may be formed in a semi-elliptical shape. Even with this configuration, the corners 52A on the end face 22A side of the stepped portion 52 can be prevented from interfering with the corners 18A of the winding winding portion 18, and the stepped portion 52 can be brought closer to the winding winding portion 18 in the Z direction. Therefore, the cross-sectional area of ​​the teeth 22 that can be used as a magnetic path can be secured, thereby further reducing the axial length of the stator 10.

[0064] 19, the protruding portion 42 of the stepped portion 52 and the third overlap portion 40 may both be formed in a trapezoidal shape when viewed from the Y direction. Also, as shown in FIG. 20, the protruding portion 42 of the stepped portion 52 may be formed in a semi-elliptical shape. Even with this configuration, the corners 52A on the end face 22A side of the stepped portion 52 can be prevented from interfering with the corners 18A of the winding winding portion 18, and the stepped portion 52 can be brought closer to the winding winding portion 18 in the Z direction. Therefore, the cross-sectional area of ​​the teeth 22 that can be utilized as a magnetic path can be secured, and the axial length of the stator 10 can be further reduced.

[0065] Eighth Embodiment Next, a stator 10 according to an eighth embodiment of the technology of the present disclosure will be described.

[0066] In the eighth embodiment, the configuration of the stator 10 is modified as follows compared to the fifth embodiment. That is, in the fifth embodiment, the first overlap portion 36 is disposed between the second overlap portion 38 and the third overlap portion 40 in the X direction. In contrast, as shown in Fig. 21 , in the eighth embodiment, the second overlap portion 38 is disposed between the first overlap portion 36 and the third overlap portion 40 in the X direction. A gas layer 44 is provided between the first overlap portion 36 and the insulating sheet 32, and the winding winding portion 18 in the X direction.

[0067] 22 , an insulating sheet 32 ​​is disposed between the winding portion 18 and the core back portion 20 in the Y direction. A gas layer 45 is provided between the first overlap portion 36 and the insulating sheet 32 ​​and the core back portion 20 in the Y direction.

[0068] (Claim 13) In the eighth embodiment, the second overlap portion 38 is disposed between the first overlap portion 36 and the third overlap portion 40 in the X direction. Therefore, the second overlap portion 38 can be sandwiched between the first overlap portion 36 and the third overlap portion 40. This prevents the second overlap portion 38, which is part of the insulating sheet 32, from separating from the side surface 22B of the tooth portion 22 when the winding is wound around the tooth portion 22 with the insulating member 30 and the insulating sheet 32 ​​attached thereto to form the winding winding portion 18.

[0069] Furthermore, a gas layer 44 is provided between the first overlap portion 36 and the insulating sheet 32 ​​in the X direction and the winding winding portion 18. Therefore, the provision of the gas layer 45 can improve the insulation between the teeth portion 22 and the winding winding portion 18.

[0070] In addition, a gas layer 45 is provided between the insulating sheet 32 ​​and the first overlap portion 36 and the core back portion 20 in the Y direction. Therefore, the provision of the gas layer 45 can improve the insulation between the core back portion 20 and the winding winding portion 18.

[0071] Among the configurations described in the above embodiments (that is, configurations including modified examples), configurations that can be combined may be combined as appropriate.

[0072] 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 modified forms within the scope of the gist of the present disclosure.

[0073] Below, supplementary notes are provided regarding the technology of the present disclosure. (Supplementary Note 1) 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, each of the insulators having an insulating member (30) that insulates the tooth portion from the axial direction of the stator core and an insulating sheet (32) that insulates the tooth portion from the tangential direction of the stator core, the insulating member having a first overlap portion (36) extending in the axial direction of the stator core, the insulating sheet having a second overlap portion (38) extending on an opposite side to the first overlap portion (36) and overlapping with the first overlap portion in the axial direction of the stator core, and the tooth portion having a third overlap portion (40) overlapping with the first overlap portion and the second overlap portion in the axial direction of the stator core. Stator (10). (Supplementary Note 2) The stator according to Supplementary Note 1, wherein the tooth portions have a constant width along a tangential direction of the stator core throughout the axial direction of the stator core. (Supplementary Note 3) The stator according to Supplementary Note 1 or Supplementary Note 2, wherein a first gas layer (44) is provided between the tooth portions and the insulating sheet in the tangential direction of the stator core by the insulating sheet being supported by the tooth portions via the first overlap portions. (Supplementary Note 4) The stator according to any one of Supplementary Notes 1 to 3, wherein the tooth portions have protrusions (42) that protrude in the axial direction of the stator core beyond the tip ends of the second overlap portions. (Supplementary Note 5) The stator according to any one of Supplementary Notes 1 to 4, wherein the second overlap portion is positioned on the opposite side of the teeth portion relative to the first overlap portion in the tangential direction of the stator core, and the insulating sheet has an extension portion (50) extending from a tip end of the second overlap portion to a position covering the teeth portion from the axial direction of the stator core.(Supplementary Note 6) The stator according to any one of Supplementary Notes 1 to 5, wherein a first gas layer (44) is provided between the winding winding portion and the insulating sheet in the tangential direction of the stator core by supporting the winding winding portion on the insulating sheet via the first overlap portion. (Supplementary Note 7) The tooth portion has a main body portion (46) and a stepped portion (52) located on the insulating member side of the main body portion in the axial direction of the stator core, and a step (54) is formed between the main body portion and the stepped portion in the axial direction of the stator core so that the width of the tooth portion in the tangential direction of the stator core is narrower at the stepped portion than at the main body portion. (Supplementary Note 8) The stator according to Supplementary Note 7, wherein the stepped portion has the third overlap portion. (Supplementary Note 9) The stator according to Supplementary Note 7 or Supplementary Note 8, wherein the stepped portion has a protruding portion that protrudes in the axial direction of the stator core further than a tip end of the second overlap portion. (Supplementary Note 10) The stator according to Supplementary Note 9, wherein the protruding portion protrudes in the axial direction of the stator core further than a base end of the first overlap portion. (Supplementary Note 11) The stator according to any one of Supplementary Notes 7 to 10, wherein the insulating member has a protruding portion (56) that protrudes in a tangential direction of the stator core, and a first gas layer is provided between the winding winding portion and the insulating sheet in the tangential direction of the stator core by supporting the winding winding portion on the protruding portion. (Supplementary Note 12) The stator according to any one of Supplementary Notes 7 to 11, wherein the stepped portion has a plurality of the steps. (Supplementary Note 13) The stator according to any one of Supplementary notes 7 to 12, wherein the second overlap portion is disposed between the first overlap portion and the third overlap portion in a tangential direction of the stator core.(Supplementary Note 14) The stator according to any one of Supplementary Notes 1 to 13, wherein the teeth have a main body portion and a support portion (48) located on the insulating member side of the main body portion in the axial direction of the stator core and supporting the insulating member, and the support portion is formed into a shape whose width along a tangential direction of the stator core narrows toward a side away from the main body portion along the axial direction of the stator core. (Supplementary Note 15) The stator core has a plurality of core back portions (20) respectively connected to base ends of the plurality of teeth portions, and the insulating sheet and a second gas layer (45) are provided between the core back portion and the winding winding portion in the radial direction of the stator core.

Claims

1. 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 windings (18) wound around the plurality of tooth portions via the insulators, wherein each of the insulators has an insulating member (30) that insulates the tooth portion from the axial direction of the stator core and an insulating sheet (32) that insulates the tooth portion from the tangential direction of the stator core, wherein the insulating member has a first overlap portion (36) extending in the axial direction of the stator core, and the insulating sheet has a second overlap portion (38) that extends on the opposite side to the first overlap portion (36) and overlaps with the first overlap portion in the axial direction of the stator core, and the tooth portion has a third overlap portion (40) that overlaps with the first overlap portion and the second overlap portion in the axial direction of the stator core. Stator (10).

2. The stator according to claim 1, wherein the tooth portion has a constant width along the tangential direction of the stator core throughout the axial direction of the stator core.

3. A stator as set forth in claim 1 or claim 2, wherein a first gas layer (44) is provided between the teeth and the insulating sheet in the tangential direction of the stator core by supporting the insulating sheet on the teeth via the first overlap portion.

4. A stator according to any one of claims 1 to 3, wherein the tooth portion has a protruding portion (42) that protrudes in the axial direction of the stator core beyond the tip end of the second overlap portion.

5. A stator as claimed in any one of claims 1 to 4, wherein the second overlap portion is positioned on the opposite side of the teeth portion relative to the first overlap portion in the tangential direction of the stator core, and the insulating sheet has an extension portion (50) that extends from the tip of the second overlap portion to a position that covers the teeth portion from the axial direction of the stator core.

6. A stator as set forth in any one of claims 1 to 5, wherein a first gas layer (44) is provided between the winding winding portion and the insulating sheet in the tangential direction of the stator core by supporting the winding winding portion on the insulating sheet via the first overlap portion.

7. A stator as described in claim 1, wherein the teeth have a main body (46) and a stepped portion (52) located on the insulating member side of the main body in the axial direction of the stator core, and a step (54) is formed between the main body and the stepped portion in the axial direction of the stator core, making the width of the teeth along the tangential direction of the stator core narrower at the stepped portion than at the main body.

8. A stator according to claim 7, wherein the stepped portion has the third overlap portion.

9. A stator according to claim 7 or 8, wherein the stepped portion has a protruding portion that protrudes in the axial direction of the stator core beyond the tip end of the second overlap portion.

10. A stator according to claim 9, wherein the protruding portion protrudes in the axial direction of the stator core beyond a base end of the first overlap portion.

11. A stator as set forth in any one of claims 7 to 10, wherein the insulating member has a protruding portion (56) that protrudes in a tangential direction of the stator core, and a first gas layer is provided between the winding winding portion and the insulating sheet in the tangential direction of the stator core by supporting the winding winding portion on the protruding portion.

12. A stator according to any one of claims 7 to 11, wherein the stepped portion has a plurality of steps.

13. A stator according to any one of claims 7 to 12, wherein the second overlap portion is disposed between the first overlap portion and the third overlap portion in the tangential direction of the stator core.

14. A stator as claimed in any one of claims 1 to 13, wherein the teeth have a main body portion and a support portion (48) located on the insulating member side of the main body portion in the axial direction of the stator core and supporting the insulating member, and the support portion is formed in a shape such that its width along the tangential direction of the stator core narrows towards the side away from the main body portion along the axial direction of the stator core.

15. A stator as claimed in any one of claims 1 to 14, wherein the stator core has a plurality of core back portions (20) connected to the base ends of the plurality of tooth portions, and the insulating sheet and a second gas layer (45) are provided between the core back portions and the winding winding portion in the radial direction of the stator core.

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