Stator

Abstract

A stator (10) comprises: a stator core (28) having a plurality of radially extending teeth sections (26); a resin insulator (16) mounted on the stator core; and a winding (18) wound around the plurality of teeth sections via the insulator, wherein the insulator has a body section (34) mounted on the teeth sections, a first extended section (38L) extending from the body section to one side of the stator core in the circumferential direction and located between the winding and a tip section (26B) of the teeth sections, and a second extended section (38R) extending from the body section to the other side of the stator core in the circumferential direction and located between the winding and the tip section of the teeth sections. The first extended section corresponding to one of adjacent teeth sections and the second extended section corresponding to the other of adjacent teeth sections have overlapping sections (46L, 46R) that overlap in the circumferential 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. 2023-202223, filed on November 29, 2023, the entire contents of which are incorporated herein by reference.

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

[0003] For example, Japanese Patent Laid-Open Publication No. 2005-130540 discloses an electric motor in which the stator core is composed of a teeth core made up of a plurality of teeth that form a plurality of slots in the circumferential direction for winding coils, and a yoke core into which the teeth core is fitted, the teeth core being held by an insulator made of an insulating material, in which an insulating film processed to a shape that conforms to the teeth is interposed in the slots, and the portion of the insulating film between the yoke core and the coil wound in the slot is insulated by overlapping two bent flaps formed on both ends of the insulating film.It is said that with this electric motor, the fitting of the teeth core into the yoke core causes the bent flaps on both ends of the insulating film to overlap, thereby ensuring reliable insulation.

[0004] As a result of detailed investigations by the inventors, the following problem was discovered: In the above-mentioned conventional technology, when a high voltage is applied to the windings, there is a risk of dielectric breakdown in the insulating film. To withstand this high voltage, it is conceivable to increase the thickness of the resin portion of the insulator provided between the teeth and the windings, but doing so would result in a risk of the stator becoming larger.

[0005] The technology of the present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a stator that can ensure insulation from the windings while suppressing an increase in size of the stator.

[0006] The stator according to the disclosed technology comprises a stator core having a ring-shaped annular portion and a plurality of teeth extending radially from the annular portion, a resin insulator attached to the stator core, and windings wound around the plurality of teeth via the insulator, wherein the insulator has a main body attached to the teeth, a first extension portion extending from the main body to one side of the stator core in the circumferential direction and positioned between the windings and the tips of the teeth, and a second extension portion extending from the main body to the other side of the stator core in the circumferential direction and positioned between the windings and the tips of the teeth, and the first extension portion corresponding to one of the plurality of adjacent teeth and the second extension portion corresponding to the other of the plurality of teeth have overlapping portions that overlap in the circumferential direction of the stator core.

[0007] According to the stator according to the technique of the present disclosure, it is possible to ensure insulation for the windings while suppressing an increase in size of the stator.

[0008] FIG. 1 is a plan cross-sectional view of a stator according to the first embodiment. FIG. 2 is an enlarged view of a portion A shown in FIG. 2. FIG. 3 is an enlarged view of a portion B shown in FIG. 2. FIG. 4 is an enlarged view of a portion A showing a first modified example of the stator component according to the first embodiment. FIG. 5 is an enlarged view of a portion B showing a portion B shown in FIG. 2. FIG. 6 is an enlarged view of a portion A showing a first modified example of the stator component according to the first embodiment. FIG. 7 is an enlarged view of a portion B showing a portion A showing a second modified example of the stator component according to the first embodiment. FIG. 8 is an enlarged view of a portion A showing a portion B showing a portion A showing a

[0009] First Embodiment First, a first embodiment of the technology of the present disclosure will be described.

[0010] As shown in FIG. 1 , a stator 10 according to the first embodiment 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 drawing, the X direction indicates a direction perpendicular to the radial direction of the stator 10 when viewed from the axial 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 circumferential direction of a stator core 28, which will be described later, is the same direction as the circumferential direction of the stator 10.

[0012] As shown in Fig. 2, each stator component 12 includes a core member 14, an insulator 16, and a winding 18. The core member 14 has a core back portion 24 and teeth portions 26. The core back portion 24 extends in the circumferential direction of the stator core 28, and the teeth portions 26 extend inward in the Y direction from the center of the core back portion 24. Shaft portions 26A of the teeth portions 26 are connected to the core back portion 24. Tip portions 26B of the teeth portions 26 are free ends that expand in an arc shape along the circumferential direction of the stator core 28 relative to the shaft portions 26A.

[0013] A stator core 28 (see also FIG. 1 ) is formed by combining a plurality of core members 14 in an annular shape. When the stator core 28 is formed, the plurality of core back portions 24 form an annular portion 30 (see also FIG. 1 ), and the plurality of teeth portions 26 extend radially from the center of the stator core 28. Slots 32 are formed between the plurality of teeth portions 26.

[0014] The insulators 16 are attached to the core members 14. 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). Any resin can be used to form the insulators 16. Unless otherwise specified, the insulators 16 attached to each core member 14 are configured symmetrically in the X direction.

[0015] The winding 18 has a winding portion 20 wound around the tooth portion 26 via the insulator 16, and a winding terminal portion 22 continuous with the winding portion 20. The winding portion 20 is formed by winding the winding 18 around the tooth portion 26 in the Y direction. The winding 18 may have only one winding portion 20, or may have several winding portions 2018.

[0016] As shown in FIGS. 2 to 4 , the insulator 16 includes a main body portion 34, a pair of first insulating portions 36, a pair of second insulating portions 38, and a third insulating portion 40. The main body portion 34 is attached to the shaft portion 26A of the tooth portion 26. One of the pair of first insulating portions 36 extends from the main body portion 34 to one circumferential side of the stator core 28, and the other of the pair of first insulating portions 36 extends from the main body portion 34 to the other circumferential side of the stator core 28. Each first insulating portion 36 is located between the winding winding portion 20 and the core back portion 24. The first insulating portion 36 is an example of a "partition portion" according to the technology disclosed herein. The extending end portion 36A of each first insulating portion 36 is located outside the outer diameter portion 20A of the winding winding portion 20 (i.e., on the opposite side from the main body portion 34) when viewed in the Z direction. That is, the extending end portion 36A of each first insulating portion 36 protrudes in the X direction beyond the outer diameter portion 20A of the winding winding portion 20 when viewed in the Z direction.

[0017] One of the pair of second insulating portions 38 extends from the main body portion 34 to one circumferential side of the stator core 28, and the other of the pair of second insulating portions 38 extends from the main body portion 34 to the other circumferential side of the stator core 28. Each second insulating portion 38 is located between the winding terminal portion 22 and the tip end portion 26B of the tooth portion 26. The pair of second insulating portions 38 are examples of the "extending portion," "first extending portion," and "second extending portion" according to the technology disclosed herein. The third insulating portion 40 extends outward from the main body portion 34 in the Y direction and covers the central portion of the core back portion 24 from the Z direction.

[0018] As shown in Fig. 3, a groove 42 (in other words, a gap) is provided between the first insulating portion 36 and the core back portion 24. Specifically, the first insulating portion 36 has an opposing surface 36B that faces the core back portion 24, and the core back portion 24 has an opposing surface 24A that faces the first insulating portion 36. The opposing surfaces 24A and 36B extend in the X and Z directions and face each other with a gap in the Y direction. The gap between the opposing surfaces 24A and 36B forms the groove 42. By providing the groove 42 between the first insulating portion 36 and the core back portion 24 in this way, it is possible to ensure the creepage distance L1 between the winding winding portion 20 and the core back portion 24.

[0019] In this specification, the creepage distance refers to the shortest distance along the surface of the insulator 16 from the winding 18 to the stator core 28. The IEC 60664-1 standard established by the International Electrotechnical Commission (IEC) specifies that the creepage distance due to a groove whose width is less than a predetermined width is not taken into consideration, but the width W of the groove 42 is set to be equal to or greater than the predetermined width specified in the IEC 60664-1 standard, which takes into consideration the creepage distance due to the groove.

[0020] 4 , each second insulating portion 38 has a holding portion 44 that holds the winding end portion 22. Specifically, the holding portion 44 is formed in a concave shape, and the winding end portion 22 is inserted into the inside of the concave holding portion 44, thereby holding the winding end portion 22 by the holding portion 44.

[0021] Furthermore, one of the pair of second insulating portions 38 (hereinafter referred to as the "second insulating portion 38L") has an extension portion 46L extending to one circumferential side of the stator core 28, and the other of the pair of second insulating portions 38 (hereinafter referred to as the "second insulating portion 38R") has an extension portion 46R extending to the other circumferential side of the stator core 28.

[0022] The extension portion 46L corresponding to one of the adjacent teeth 26 among the plurality of teeth 26 is located inside in the Y direction with respect to the extension portion 46R corresponding to the other of the adjacent teeth 26 among the plurality of teeth 26. The extension portion 46L may also be located outside in the Y direction with respect to the extension portion 46R. The extension portions 46L and 46R overlap in the circumferential direction of the stator core 28. The extension portions 46L and 46R are an example of an "overlapping portion" according to the technology of the present disclosure. In this way, the extension portions 46L and 46R overlap in the circumferential direction of the stator core 28, thereby ensuring the creepage distance L2 between the winding terminal portion 22 and the tip end portion 26B of the tooth portion 26.

[0023] Next, the operation and effects of the first embodiment of the technique of the present disclosure will be described.

[0024] As described above in detail, in the first embodiment, the groove 42 is provided between the first insulating portion 36 and the core back portion 24. Therefore, the groove 42 can ensure the creeping distance L1 between the winding winding portion 20 and the core back portion 24, and therefore the insulation against the winding 18 can be ensured.

[0025] Furthermore, by ensuring insulation against the winding 18 by ensuring the creepage distance L1, the thickness of the first insulating portion 36 can be made thinner than when the winding winding portion 20 and the core back portion 24 are insulated only by the first insulating portion 36. This allows the cross-sectional area of ​​the slot 32 to be increased, and therefore the number of turns of the winding winding portion 20 can be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in size in order to increase the cross-sectional area of ​​the slot 32.

[0026] Furthermore, in the first embodiment, the second insulating portion 38L has an extension 46L extending to one circumferential side of the stator core 28, and the second insulating portion 38R has an extension 46R extending to the other circumferential side of the stator core 28. The extensions 46L and 46R overlap in the circumferential direction of the stator core 28. Therefore, by having the extensions 46L and 46R overlap in the circumferential direction of the stator core 28, the creepage distance L2 between the winding terminal portions 22 and the tip ends 26B of the teeth 26 can be ensured, and insulation from the windings 18 can be ensured.

[0027] Furthermore, by ensuring insulation against the winding 18 by ensuring the creepage distance L2, the thickness of the second insulating portion 38 can be made thinner than when the tip end 26B of the tooth portion 26 and the winding 18 are insulated only by the second insulating portion 38. This allows the cross-sectional area of ​​the slot 32 to be increased, and therefore the number of turns of the winding winding portion 20 can be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in size in order to increase the cross-sectional area of ​​the slot 32.

[0028] In the first embodiment, the facing surface 24A of the core back portion 24 extends in the X direction, but as shown in Fig. 5, the facing surface 24A of the core back may be formed so as to be inclined toward the first insulating portion 36 as it moves away from the teeth portion 26 along the circumferential direction of the stator core 28. In the example shown in Fig. 5, the facing surface 24A is formed by a curved surface that follows the circumferential direction of the stator core 28, but the facing surface 24A may be formed by an inclined surface (i.e., an inclined plane) that inclines toward the first insulating portion 36 as it moves away from the teeth portion 26 along the circumferential direction of the stator core 28.

[0029] With this configuration, the groove width of the groove 42 is increased on the tooth portion 26 side, so that the creepage distance L1 between the winding winding portion 20 and the core back portion 24 can be increased compared to the first embodiment, thereby improving the insulation against the winding 18.

[0030] Furthermore, in the first embodiment, the extending end portion 36A of each first insulating portion 36 protrudes in the X direction further than the outer diameter portion 20A of the winding winding portion 20 when viewed from the Z direction. However, as shown in FIG. 6, the extending end portion 36A of each first insulating portion 36 may be located closer to the main body portion 34 than the outer diameter portion 20A of the winding winding portion 20 when viewed from the Z direction.

[0031] With this configuration, the creepage distance L1 is ensured, thereby ensuring insulation for the winding 18, and the first insulating portion 36, and therefore the insulator 16, can be made smaller.

[0032] Second Embodiment Next, a second embodiment of the technique 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. 7 , one of the pair of first insulating portions 36 (hereinafter referred to as the “first insulating portion 36L”) has an extension portion 48L extending to one circumferential side of the stator core 28, and the other of the pair of first insulating portions 36 (hereinafter referred to as the “first insulating portion 36R”) has an extension portion 48R extending to the other circumferential side of the stator core 28. The extension portion 48L is located outward in the Y direction from the extension portion 48R. The extension portion 48L may also be located inward in the Y direction from the extension portion 48R. The extension portions 48L and 48R overlap in the circumferential direction of the stator core 28. The pair of first insulating portions 36 are an example of a “first partition portion” and a “second partition portion” according to the technology disclosed herein. The extension portion 48L and the extension portion 48R are an example of an "overlapping portion" according to the technology of the present disclosure.

[0034] With this configuration, the creepage distance L1 between the winding winding portion 20 and the core back portion 24 can be increased compared to the first embodiment, thereby improving the insulation properties for the winding 18.

[0035] In addition, the extension portions 46L and 46R may be formed to be bendable in the first insulating portion 36L and the first insulating portion 36R, respectively, and may overlap in the circumferential direction of the stator core 28 by being bent after multiple core members 14 are combined in a ring shape.

[0036] Third Embodiment Next, a third embodiment of the technique 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. 8, an insulating portion 50 is provided on the extending end portion 36A of each first insulating portion 36. The insulating portion 50 has a protruding portion 50A that protrudes inward in the Y direction from the extending end portion 36A of the first insulating portion 36. The insulating portion 50 is formed in the shape of a resin block, for example.

[0038] With this configuration, the creepage distance L1 between the winding winding portion 20 and the core back portion 24 can be increased compared to the first embodiment, thereby improving the insulation properties for the winding 18.

[0039] Fourth Embodiment Next, a fourth embodiment of the technique of the present disclosure will be described.

[0040] In the fourth embodiment, the configuration of the stator 10 is modified as follows from the first embodiment: That is, in the first embodiment, the opposing surface 24A of the core back portion 24 extends generally flat in the X direction when viewed from the Z direction, but in the fourth embodiment, as shown in Fig. 9 , a surface 24A1 of the opposing surface 24A corresponding to the extending end portion 36A of the first insulating portion 36 is formed as an inclined surface that slopes away from the first insulating portion 36 as it extends along the circumferential direction of the stator core 28 away from the teeth portion 26.

[0041] With this configuration, the creepage distance L3 between the winding winding portion 20 and the opposing surface 24A can be increased compared to when the opposing surface 24A extends flatly in the X direction as a whole, thereby improving the insulation against the winding 18.

[0042] In the example shown in Figure 9, surface 24A1 is formed by an inclined surface (i.e., an inclined plane) that slopes away from first insulating portion 36 along the circumferential direction of stator core 28 as it moves away from tooth portion 26, but it may also be formed by a curved surface that slopes away from first insulating portion 36 as it moves away from tooth portion 26 along the circumferential direction of stator core 28.

[0043] 9, when the surface 24A1 is formed on the opposing surface 24A, the step portions 52 formed on the corners on the outer periphery of the core back portion 24 may be omitted in order to compensate for the volume of the core back portion 24 resulting from the formation of the surface 24A1, as shown in Fig. 10. Furthermore, when the step portions 52 are omitted, recesses 54 may be formed on the outer periphery of the core back portion 24 in order to reduce the load when the stator core 28 is fitted into an outer periphery ring (not shown).

[0044] Fifth Embodiment Next, a fifth embodiment of the technique of the present disclosure will be described.

[0045] 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. 11 , in the fifth embodiment, the insulator 16 has a bent portion 56 that extends from the extending end 36A of the first insulating portion 36 toward the tip end 26B of the tooth portion 26. The bent portion 56 is formed integrally with the extending end 36A of the first insulating portion 36 and is bent relative to the extending end 36A of the first insulating portion 36. As an example, the tip end of the bent portion 56 reaches the extending end 38A of the second insulating portion 38.

[0046] With this configuration, it is possible to ensure a creepage distance L4 between the winding winding portion 20 and the tip end 26B of the tooth portion 26. This makes it possible to ensure insulation from the winding 18.

[0047] 12, the tip of the bent portion 56 does not have to reach the extending end portion 38A of the second insulating portion 38. With this configuration, the creepage distance L1 between the winding winding portion 20 and the core back portion 24 can be increased compared to the first embodiment, thereby improving the insulation properties with respect to the winding 18.

[0048] Sixth Embodiment Next, a sixth embodiment of the technique of the present disclosure will be described.

[0049] In the sixth embodiment, the configuration of the stator 10 is modified as follows from the first embodiment. That is, as shown in FIGS. 13 and 14 , a slit 58A that opens to the extending end 38A of the second insulating portion 38L is formed in the second insulating portion 38L, and a slit 58B that opens to the extending end 38A of the second insulating portion 38R is formed in the second insulating portion 38R. The slits 58A and 58B are examples of the "slit," "first slit," and "second slit" according to the technology disclosed herein. The widths of the slits 58A and 58B are set to be equal to or greater than the width predetermined in the IEC 60664-1 standard, taking into account the creepage distance due to the groove.

[0050] With this configuration, compared to the first embodiment, it is possible to increase the creepage distance L2 between the winding terminal portion 22 and the tip end portion 26B of the tooth portion 26. This improves the insulation properties with respect to the winding 18.

[0051] 14, an insulator 60 may be inserted into a slit 58A corresponding to one of the adjacent teeth 26 among the plurality of teeth 26 and a second slit 58B corresponding to the other of the adjacent teeth 26 among the plurality of teeth 26. The insulator 60 may be a block-shaped resin member or insulating paper. With this configuration, the insulation against the winding 18 can be improved compared to the example shown in FIG. 13.

[0052] Seventh Embodiment Next, a seventh embodiment of the technique of the present disclosure will be described.

[0053] In the seventh embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, as shown in FIG. 15 , in the seventh embodiment, the insulator 16 has a bent portion 62 extending from the extending end portion 38A of the second insulating portion 38 toward the core back portion 24. The bent portion 62 is integrally formed with the extending end portion 38A of the second insulating portion 38 and is bent relative to the extending end portion 38A of the second insulating portion. As an example, the tip of the bent portion 62 reaches the extending end portion 36A of the first insulating portion 36. The bent portion 62 provided in each second insulating portion 38 is an example of a "first bent portion" and a "second bent portion" according to the technology of the present invention.

[0054] With this configuration, it is possible to ensure a creepage distance L5 between the winding terminal portion 22 and the core back portion 24. This makes it possible to ensure insulation against the winding 18.

[0055] 16, the tip of the bent portion 62 does not have to reach the extending end portion 36A of the first insulating portion 36. Even with this configuration, it is possible to ensure the creepage distance L2 between the winding terminal portion 22 and the tip end portion 26B of the tooth portion 26. This ensures insulation from the winding 18.

[0056] Eighth Embodiment Next, an eighth embodiment of the technique of the present disclosure will be described.

[0057] In the eighth embodiment, the configuration of the stator 10 is modified as follows compared to the first embodiment. That is, in the eighth embodiment, the insulator 16 has a pair of insulator portions 66 divided in the Z direction by a dividing portion 64. The pair of insulator portions 66 are configured symmetrically in the Z direction. Each insulator portion 66 has a side surface 66A that faces the shaft portion 26A of the tooth portion 26 in the X direction. A stepped portion 68 having a step in the X direction is formed on the surface of the side surface 66A facing the dividing portion 64.

[0058] With this configuration, it is possible to ensure a creepage distance L6 between the winding winding portion 20 and the shaft portion 26A of the tooth portion 26. This makes it possible to ensure insulation from the winding 18.

[0059] In the above-described embodiments, the stator core 28 is divided into a plurality of core members 14. However, the plurality of core members 14 may be integrated. The insulators 16 attached to the core members 14 may also be integrated.

[0060] Furthermore, among the configurations described in the above embodiments, configurations that can be combined may be combined as appropriate.

[0061] 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.

[0062] The following are supplementary notes regarding the technology of the present disclosure. (Supplementary Note 1) A stator core (28) having an annular portion (30) and a plurality of teeth (26) extending radially from the annular portion, a resin insulator (16) attached to the stator core, and windings (18) wound around the plurality of teeth via the insulator, wherein the insulator has a main body portion (34) attached to the teeth, a first extension portion (38L) extending from the main body portion to one side in the circumferential direction of the stator core and positioned between the windings and the tip ends (26B) of the teeth, and a second extension portion (38R) extending from the main body portion to the other side in the circumferential direction of the stator core and positioned between the windings and the tip ends of the teeth. A stator (10), wherein the first extension portion corresponding to one of adjacent teeth among the plurality of teeth and the second extension portion corresponding to the other of the adjacent teeth have overlapping portions (46L, 46R) that overlap in the circumferential direction of the stator core. (Supplementary Note 2) The stator according to Supplementary Note 1, wherein a first slit (58L) opening at an extension end of the first extension portion is formed in the first extension portion, and a second slit (58R) opening at an extension end of the second extension portion is formed in the second extension portion. (Supplementary Note 3) The stator according to Supplementary Note 2, wherein an insulator (60) is inserted into the first slit corresponding to one of adjacent teeth among the plurality of teeth and the second slit corresponding to the other of adjacent teeth among the plurality of teeth. (Supplementary Note 4) The stator according to any one of Supplementary Notes 1 to 3, wherein the insulator has: a first bent portion (62) extending from an extended end of the first extending portion toward the annular portion, and a second bent portion (62) extending from an extended end of the second extending portion toward the annular portion. (Supplementary Note 5) The stator according to any one of Supplementary Notes 1 to 4, wherein the insulator has a partition wall portion (36) extending from the main body portion in a circumferential direction of the stator core and positioned between the winding and the annular portion, and a groove (42) is provided between the partition wall portion and the annular portion.(Supplementary Note 6) The stator according to Supplementary Note 5, wherein the annular portion has an opposing surface (24A) opposing the partition wall portion, and the opposing surface is formed by an inclined surface or a curved surface that approaches the partition wall portion as it moves away from the teeth portion along the circumferential direction of the stator core. (Supplementary Note 7) The stator according to Supplementary Note 5 or Supplementary Note 6, wherein an extending end portion (36A) of the partition wall portion is located closer to the main body portion than an outer diameter portion (20A) of the winding as viewed in the axial direction of the stator core. (Appendix 8) The stator according to any one of Appendices 5 to 7, wherein the insulator has: a first partition wall portion (36L) as the partition wall portion extending from the main body portion to one side in the circumferential direction of the stator core; and a second partition wall portion (36R) as the partition wall portion extending from the main body portion to the other side in the circumferential direction of the stator core, and the first partition wall portion corresponding to one of adjacent teeth portions of the plurality of teeth and the second partition wall portion corresponding to the other adjacent tooth portion of the plurality of teeth have overlap portions (48L, 48R) that overlap in the circumferential direction of the stator core. (Appendix 9) The stator according to any one of Appendices 5 to 8, wherein an insulating portion (50) is provided at an extending end of the partition wall, and the insulating portion has a protruding portion (50A) that protrudes radially inward of the stator core relative to the extending end of the partition wall. (Supplementary Note 10) The stator according to any one of Supplementary Notes 5 to 9, wherein the annular portion has an opposing surface opposing the partition wall portion, and a surface (24A1) of the opposing surface corresponding to an extended end portion of the partition wall portion is formed by an inclined surface or a curved surface that approaches the opposite side from the partition wall portion as it moves away from the teeth portion along the circumferential direction of the stator core. (Supplementary Note 11) The stator according to any one of Supplementary Notes 5 to 10, wherein the insulator has a bent portion (56) extending from the extended end portion of the partition wall portion toward the tip end side of the teeth portion.(Supplementary Note 12) The stator according to any one of Supplementary Note 1 to Supplementary Note 11, wherein the insulator has a pair of insulator portions (66) divided by a dividing portion (64), each of the insulator portions has a side surface (66A) facing the tooth portion, and a stepped portion (68) having a step is formed on a surface of the side surface facing the dividing portion.

Claims

1. A stator core (28) having an annular portion (30) forming an annular shape and a plurality of teeth portions (26) extending radially from the annular portion; a resin insulator (16) attached to the stator core; and a winding (18) wound around the plurality of teeth portions via the insulator, wherein the insulator has a main body portion (34) attached to the teeth portions, a first extension portion (38L) extending from the main body portion to one side in the circumferential direction of the stator core and located between the winding and the tip portions (26B) of the teeth portions, and a second extension portion (38R) extending from the main body portion to the other side in the circumferential direction of the stator core and located between the winding and the tip portions of the teeth portions, a stator (10), wherein the first extension portion corresponding to one of the plurality of teeth portions adjacent to each other and the second extension portion corresponding to the other of the plurality of teeth portions have overlap portions (46L, 46R) that overlap in a circumferential direction of the stator core.

2. A stator as described in claim 1, wherein the first extension portion is formed with a first slit (58L) that opens into the extension end of the first extension portion, and the second extension portion is formed with a second slit (58R) that opens into the extension end of the second extension portion.

3. A stator as described in claim 2, wherein an insulator (60) is inserted into the first slit corresponding to one of the plurality of teeth portions adjacent to each other, and the second slit corresponding to the other of the plurality of teeth portions adjacent to each other.

4. A stator as described in any one of claims 1 to 3, wherein the insulator has a first bent portion (62) extending from the extending end of the first extending portion toward the annular portion, and a second bent portion (62) extending from the extending end of the second extending portion toward the annular portion.

5. A stator (10) as claimed in any one of claims 1 to 4, wherein the insulator has a partition wall portion (36) extending from the main body portion in the circumferential direction of the stator core and positioned between the winding and the annular portion, and a groove (42) is provided between the partition wall portion and the annular portion.

6. A stator as described in claim 5, wherein the annular portion has an opposing surface (24A) facing the partition portion, and the opposing surface is formed by an inclined surface or a curved surface that approaches the partition portion as it moves away from the teeth portion along the circumferential direction of the stator core.

7. A stator as set forth in claim 5 or claim 6, wherein an extending end portion (36A) of the partition portion is located closer to the main body portion than an outer diameter portion (20A) of the winding when viewed in the axial direction of the stator core.

8. A stator as claimed in any one of claims 5 to 7, wherein the insulator has a first partition portion (36L) as the partition portion extending from the main body portion to one side in the circumferential direction of the stator core, and a second partition portion (36R) as the partition portion extending from the main body portion to the other side in the circumferential direction of the stator core, and the first partition portion corresponding to one of the plurality of teeth portions adjacent to each other and the second partition portion corresponding to the other of the plurality of teeth portions have overlap portions (48L, 48R) that overlap in the circumferential direction of the stator core.

9. A stator as claimed in any one of claims 5 to 8, wherein an insulating portion (50) is provided at an extending end of the partition wall, and the insulating portion has a protruding portion (50A) that protrudes radially inward of the stator core relative to the extending end of the partition wall.

10. A stator as described in any one of claims 5 to 9, wherein the annular portion has an opposing surface facing the partition portion, and one of the opposing surfaces (24A1) corresponding to the extended end portion of the partition portion is formed by an inclined surface or curved surface that approaches the opposite side to the partition portion as it moves away from the teeth portion along the circumferential direction of the stator core.

11. A stator as set forth in any one of claims 5 to 10, wherein the insulator has a bent portion (56) extending from an extended end of the partition portion toward the tip end side of the teeth portion.

12. A stator as claimed in any one of claims 1 to 11, wherein the insulator has a pair of insulator portions (66) divided by a dividing portion (64), each of the insulator portions has a side surface (66A) facing the tooth portion, and a stepped portion (68) having a step is formed on the surface of the side surface facing the dividing portion.

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