Stator

Abstract

A stator (10) comprises: a stator core (24) which has a plurality of teeth parts (22) that extend radially; a plurality of insulators (16) which are mounted to the plurality of teeth parts; and a plurality of wire winding parts (18) which are wound around the plurality of teeth parts with the respective insulators interposed between the teeth parts and the winding parts. The insulators are made of resin, and are each divided by a dividing part (30) into a first insulator (16A) which is positioned on one side in the axial direction of the stator core and a second insulator (16B) which is positioned on another side in the axial direction of the stator core from the first insulator. The dividing part has a first dividing part (30A) which extends in the width direction of the corresponding teeth part and a second dividing part (30B) which extends 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. 2023-221719, filed December 27, 2023, the entire contents of which are incorporated herein by reference.

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

[0003] Conventionally, there is a stator including 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. Among these types of stators, there is one configured such that the insulators are attached to the axial end faces of the teeth, insulating paper is provided on the side faces of the teeth, and the insulator and insulating paper overlap (see, for example, the pamphlet of International Publication No. 2016 / 017030).

[0004] As a result of detailed investigations by the inventors, the following problem was discovered. In the stator configured as described above, there is a concern that dielectric breakdown may occur when a high voltage is applied to the winding portion. Therefore, the higher the voltage, the longer the creepage distance from the winding portion to the teeth must be secured. However, if the overlap length between the insulator and the insulating paper is increased to secure a long creepage distance, the axial length of the stator would increase.

[0005] The technology of the present disclosure aims to provide a stator that can ensure a creepage distance while suppressing an increase in axial length.

[0006] A first 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, each of the insulators being made of resin and divided by a dividing portion into a first insulator located on one axial side of the stator core and a second insulator located on the other axial side of the stator core relative to the first insulator, and the dividing portion having a first dividing portion extending in the width direction of the tooth portions and a second dividing portion extending in the axial direction of the stator core.

[0007] A second 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 tooth portions has a first axial end face forming an end face on one axial side of the stator core and a second axial end face forming an end face on the other axial side of the stator core, and each of the insulators is divided into a first insulator located on one widthwise side of the tooth portion and a second insulator located on the other widthwise side of the tooth portion by a first divided portion located on one axial side of the stator core relative to the first axial end face and a second divided portion located on the other axial side of the stator core relative to the second axial end face.

[0008] A third aspect of the technology disclosed herein is a stator comprising: a stator core having a plurality of radially extending tooth portions; a plurality of insulating papers 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 insulating papers, wherein each of the tooth portions has a first axial end face forming an end face on one axial side of the stator core and a second axial end face forming an end face on the other axial side of the stator core, and each of the insulating papers has an axial portion extending in the axial direction of the stator core, a first locking portion folded back from an end portion on the first axial end face side of the axial portion and engaged with the first axial end face, and a second locking portion folded back from an end portion on the second axial end face side of the axial portion and engaged with the second axial end face.

[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 each of the insulators, wherein each of the insulators is formed in a continuous ring shape around the axial direction of the tooth portion.

[0010] According to the technique of the present disclosure, a stator is provided that can ensure a creepage distance while suppressing an increase in axial length.

[0011] 1 is a plan view of a stator according to the first embodiment. FIG. 2 is a plan view of a stator component according to the first embodiment. FIG. 3 is a perspective view of a stator component according to the first embodiment. FIG. 4 is a front view of a stator component according to the first embodiment. FIG. 5 is a longitudinal sectional view of a motor to which the stator according to the first embodiment is applied. FIG. 6 is a front view of a stator component according to the second embodiment. FIG. 7 is a front view of a stator component according to the third embodiment. FIG. 8 is a front view of a stator component according to the fourth embodiment. FIG. 9 is a front view showing a first modified example of the stator component according to the fourth embodiment. FIG. 10 is a front view of a stator component according to the fifth embodiment. FIG. 11 is a perspective view of a stator component according to the sixth embodiment. FIG. 12 is an exploded perspective view of a stator component according to the sixth embodiment. FIG. 13 is a front view of a stator component according to the sixth embodiment. FIG. 14 is a perspective view of a modified example of the stator component according to the sixth embodiment. FIG. 15 is an exploded perspective view of a modified example of the stator component according to the sixth embodiment. FIG. 16 is a plan view of a core member according to the seventh embodiment. FIG. 17 is a front view of a stator component according to the seventh embodiment. FIG. 18 is a perspective view of a stator component according to the seventh embodiment. FIG. 19 is an exploded perspective view of a stator component according to the seventh embodiment. 13 is a perspective view of a stator component according to an eighth embodiment;FIG. 14 is an exploded perspective view of a stator component according to an eighth embodiment;FIG.

[0012] First Embodiment First, a first embodiment of the technology of the present disclosure will be described.

[0013] 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 the 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.

[0014] 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.

[0015] 2 , each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 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 from the center of the core back portion 20 toward the inside in the radial direction of the stator core 24. 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.

[0016] 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), and the plurality of tooth portions 22 extend radially from the center of the stator core 24. Slots 28 are formed between the plurality of tooth portions 22.

[0017] Note that the configuration of each stator component 12, including its details, is not strictly symmetrical in the tangential direction of the stator 10 when viewed in the axial direction of the stator 10. However, for the sake of convenience, the following description will assume that the main configuration of each stator component 12 is symmetrical in the tangential direction of the stator 10 when viewed in the axial direction of the stator 10, and will focus on the configuration of one side of each stator component 12.

[0018] 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 axial 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.

[0019] The winding winding portion 18 is wound around the teeth 22 via the insulators 16. The winding winding portion 18 is formed by winding the wire around the teeth 22 in the radial direction of the stator core 24. The winding forming the winding winding portion 18 may have only one winding winding portion 18 or may have several winding winding portions 18.

[0020] 3 and 4, the teeth portion 22 has a first axial end face 22A that forms a part of the end face on one axial side of the stator core 24 (see FIG. 1), and a second axial end face 22B that forms a part of the end face on the other axial side of the stator core 24. The first axial end face 22A is an example of an "axial end face" in this disclosure. Note that the winding winding portion 18 is not shown in FIG. 3 and subsequent figures.

[0021] The insulator 16 is divided by a dividing portion 30 into a first insulator 16A located on one axial side of the stator core 24 and a second insulator 16B located on the other axial side of the stator core 24 relative to the first insulator 16A. The dividing portion 30 has a first dividing portion 30A and a second dividing portion 30B.

[0022] The first divided portions 30A extend in the width direction of the tooth portions 22 (i.e., the X direction) and divide the first insulator 16A and the second insulator 16B in the axial direction of the stator core 24. The inner surfaces of the first divided portions 30A formed on the first insulator 16A and the second insulator 16B extend in the width direction of the tooth portions 22 and face each other in the axial direction of the stator core 24.

[0023] The second divided portions 30B extend in the axial direction of the stator core 24 and divide the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the second divided portions 30B formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0024] The first divided portion 30A and the second divided portion 30B are connected. That is, the divided portion 30 is formed in a curved shape having the first divided portion 30A and the second divided portion 30B. Note that the inner surface of the divided portion 30 may include a surface that is inclined with respect to the width direction of the teeth portion 22 and the axial direction of the stator core 24.

[0025] The divided portion 30 is located on one axial side of the stator core 24 relative to the first axial end face 22A. The first divided portion 30A intersects with the contact surface of the insulator 16 with the winding winding portion 18, and the second divided portion 30B intersects with the contact surface of the insulator 16 with the teeth 22. In this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A and the second divided portion 30B from the winding winding portion 18 (see FIG. 2 ) to the teeth 22.

[0026] In this way, when the dividing portion 30 is formed in a curved shape having a first dividing portion 30A and a second dividing portion 30B, the creepage distance D can be secured while preventing the axial length of the stator 10 from becoming longer, compared to, for example, when the dividing portion 30 is formed in a straight line in the width direction of the tooth portion 22 or when the dividing portion 30 is formed in a straight line in the axial direction of the stator core 24.

[0027] Furthermore, when the dividing portion 30 is located on one axial side of the stator core 24 relative to the first axial end face 22A, the creepage distance D can be made longer, for example, compared to when the dividing portion 30 is located on the widthwise outer side of the tooth portion 22.

[0028] 5 shows an example of a motor including a stator 10. The motor 100 includes a motor housing 102, a housing 104 assembled to the motor housing 102, a stator 10 fixed to the inside of the motor housing 102, a rotor 106 rotatably provided radially inside the stator 10, and a shaft 108 provided at the center of the rotor 106. The rotor 106 includes a rotor core 110 and a rotor magnet 112 provided on the outer peripheral surface of the rotor core 110.

[0029] A first bearing 114 is provided in the motor housing 102, and a second bearing 116 is provided in the housing 104. The shaft 108 is rotatably supported by the first bearing 114 and the second bearing 116. A dead space 120 is formed between the stator 10 and the housing 104 in the axial direction of the motor 100.

[0030] If the second divided portion 30B (see FIG. 4) extending in the axial direction of the stator core 24 is lengthened to ensure the above-mentioned creepage distance D, the axial length of the stator 10 will increase, but since the increased portion is accommodated in the dead space 120, the increase in the axial length of the motor 100 can be suppressed.

[0031] Second Embodiment Next, a second embodiment of the technique of the present disclosure will be described.

[0032] In the second embodiment, the configuration of the insulator 16 is modified as follows compared to the first embodiment. That is, as shown in Fig. 6, the second insulator 16B has a protrusion 34 that protrudes outward in the width direction of the tooth portion 22 along the first divided portion 30A. The tip of the protrusion 34 abuts against the winding portion 18 (see Fig. 2). With this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A and the second divided portion 30B from the winding portion 18 to the tooth portion 22.

[0033] In this way, when the second insulator 16B has a protrusion 34 that protrudes outward in the width direction of the tooth portion 22 along the first divided portion 30A, the tip of the protrusion 34 protrudes, and the creepage distance D can be lengthened in the width direction of the tooth portion 22 by the amount that the tip of the protrusion 34 protrudes.

[0034] The second insulator 16B may have a plurality of protrusions 34. There may be any number of the protrusions 34. The protrusions 34 may be arranged in the axial direction of the stator core 24 or in the radial direction of the stator core 24.

[0035] Third Embodiment Next, a third embodiment of the technique of the present disclosure will be described.

[0036] In the third embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in FIG. 7 , the first insulator 16A has a widthwise wall portion 36 that extends outward in the width direction from the teeth 22 along the first divided portion 30A, and the second insulator 16B has an axial wall portion 38 that extends in the axial direction of the stator core 24 along the second divided portion 30B. The extending end portion 36A of the widthwise wall portion 36 protrudes outward in the width direction from the teeth 22 beyond the axial wall portion 38 and abuts against the winding portion 18 (see FIG. 2 ). With this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A and the second divided portion 30B from the winding portion 18 to the teeth 22.

[0037] In this way, when the extending end portion 36A of the widthwise wall portion 36 protrudes outward in the width direction of the tooth portion 22 more than the axial wall portion 38, the creeping distance D can be lengthened in the width direction of the tooth portion 22 by the amount that the extending end portion 36A of the widthwise wall portion 36 protrudes.

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

[0039] In the fourth embodiment, the configuration of the insulator 16 is changed as follows compared to the first embodiment. That is, as shown in Fig. 8 , the divided portions 30 have a first divided portion 30A extending in the width direction of the teeth 22, a second divided portion 30B extending in the axial direction of the stator core 24, and a third divided portion 30C extending in the width direction of the teeth 22.

[0040] The first divided portions 30A extend in the width direction of the tooth portions 22 and divide the first insulator 16A and the second insulator 16B in the axial direction of the stator core 24. The inner surfaces of the first divided portions 30A formed on the first insulator 16A and the second insulator 16B extend in the width direction of the tooth portions 22 and face each other in the axial direction of the stator core 24.

[0041] The second divided portions 30B extend in the axial direction of the stator core 24 and divide the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the second divided portions 30B formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0042] The third divided portion 30C extends in the width direction of the tooth portion 22 and divides the first insulator 16A and the second insulator 16B in the axial direction of the stator core 24. The inner surfaces of the third divided portion 30C formed on the first insulator 16A and the second insulator 16B extend in the width direction of the tooth portion 22 and face each other in the axial direction of the stator core 24.

[0043] The first divided portion 30A, the second divided portion 30B, and the third divided portion 30C are connected to each other. That is, the divided portion 30 is formed in a curved shape having the first divided portion 30A, the second divided portion 30B, and the third divided portion 30C. Note that the inner surface of the divided portion 30 may include a surface that is inclined with respect to the width direction of the teeth portion 22 and the axial direction of the stator core 24.

[0044] The first divided portion 30A is located on the widthwise outer side of the teeth 22 relative to the second divided portion 30B and on one axial side of the stator core 24, while the third divided portion 30C is located on the widthwise inner side of the teeth 22 relative to the second divided portion 30B and on the other axial side of the stator core 24. The first divided portion 30A intersects with the contact surface of the insulator 16 with the winding winding portion 18, and the third divided portion 30C intersects with the contact surface of the insulator 16 with the teeth 22.

[0045] The first insulator 16A has a first axial wall portion 40 extending along the second divided portion 30B toward the other axial side of the stator core 24, and the second insulator 16B has a second axial wall portion 42 extending along the second divided portion 30B toward one axial side of the stator core 24. The second axial wall portion 42 is located on the widthwise outer side of the teeth 22 relative to the first axial wall portion 40. The first axial wall portion 40 and the second axial wall portion 42 overlap in the axial direction of the stator core 24. In this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A, the second divided portion 30B, and the third divided portion 30C from the winding portion 18 to the teeth 22.

[0046] In this way, if the first insulator 16A has a first axial wall portion 40 extending toward the other axial side of the stator core 24 along the second divided portion 30B, and the second insulator 16B has a second axial wall portion 42 extending toward one axial side of the stator core 24 along the second divided portion 30B, and the first axial wall portion 40 and the second axial wall portion 42 overlap in the axial direction of the stator core 24, the creepage distance D can be increased by the amount that the first axial wall portion 40 and the second axial wall portion 42 overlap.

[0047] In the fourth embodiment, the dividing portion 30 is located on one axial side of the stator core 24 relative to the first axial end face 22A, but as shown in Figure 9, the dividing portion 30 may also be located on the other axial side of the stator core 24 relative to the first axial end face 22A (in other words, more axially outer than the side surface 22C on the widthwise outer side of the tooth portion 22).

[0048] In addition, in the fourth embodiment, the second axial wall portion 42 is located on the widthwise outer side of the tooth portion 22 relative to the first axial wall portion 40, but as shown in Figure 10, the second axial wall portion 42 may also be located on the widthwise inner side of the tooth portion 22 relative to the first axial wall portion 40.

[0049] Also, as shown in Figure 11, in a configuration in which the dividing portion 30 is located on one axial side of the stator core 24 relative to the first axial end face 22A, the second axial wall portion 42 may be located widthwise inward of the tooth portion 22 relative to the first axial wall portion 40.

[0050] Also, as shown in Figure 11, the dividing portion 30 may have a first dividing portion 30A extending in the width direction of the tooth portion 22, a second dividing portion 30B extending in the axial direction of the stator core 24, a third dividing portion 30C extending in the width direction of the tooth portion 22, and a fourth dividing portion 30D extending in the axial direction of the stator core 24.

[0051] The fourth divided portion 30B extends in the axial direction of the stator core 24 and divides the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the fourth divided portion 30D formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0052] The first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D are connected to each other. That is, the divided portion 30 is formed in a curved shape having the first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D. Note that the inner surface of the divided portion 30 may include a surface that is inclined with respect to the width direction of the teeth portion 22 and the axial direction of the stator core 24.

[0053] The fourth divided portion 30D is located widthwise inward of the teeth 22 relative to the third divided portion 30C and on the other axial side of the stator core 24, and intersects with the contact surface of the insulator 16 with the teeth 22. In this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D from the winding portion 18 (see FIG. 2) to the teeth 22. With this configuration, the creepage distance D can be increased by the amount of the fourth divided portion 30D.

[0054] Fifth Embodiment Next, a fifth embodiment of the technique of the present disclosure will be described.

[0055] In the fifth embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in Fig. 12 , the first insulator 16A has a recess 44 that is recessed toward one axial side of the stator core 24 along the second divided portion 30B, and the second insulator 16B has a protrusion 46 that protrudes toward one axial side of the stator core 24 along the second divided portion 30B. The protrusion 46 is press-fitted into the recess 44.

[0056] The dividing portion 30 has a first dividing portion 30A extending in the width direction of the tooth portion 22, a second dividing portion 30B extending in the axial direction of the stator core 24, a third dividing portion 30C extending in the width direction of the tooth portion 22, and a fourth dividing portion 30D extending in the axial direction of the stator core 24.

[0057] The first divided portions 30A extend in the width direction of the tooth portions 22 and divide the first insulator 16A and the second insulator 16B in the axial direction of the stator core 24. The inner surfaces of the first divided portions 30A formed on the first insulator 16A and the second insulator 16B extend in the width direction of the tooth portions 22 and face each other in the axial direction of the stator core 24.

[0058] The second divided portions 30B extend in the axial direction of the stator core 24 and divide the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the second divided portions 30B formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0059] The third divided portion 30C extends in the width direction of the tooth portion 22 and divides the first insulator 16A and the second insulator 16B in the axial direction of the stator core 24. The inner surfaces of the third divided portion 30C formed on the first insulator 16A and the second insulator 16B extend in the width direction of the tooth portion 22 and face each other in the axial direction of the stator core 24.

[0060] The fourth divided portion 30B extends in the axial direction of the stator core 24 and divides the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the fourth divided portion 30D formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0061] The first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D are connected to each other. That is, the divided portion 30 is formed in a curved shape having the first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D. Note that the inner surface of the divided portion 30 may include a surface that is inclined with respect to the width direction of the teeth portion 22 and the axial direction of the stator core 24.

[0062] The first divided portion 30A is located on the widthwise outer side of the teeth 22 relative to the second divided portion 30B and on the other axial side of the stator core 24, while the third divided portion 30C is located on the widthwise inner side of the teeth 22 relative to the second divided portion 30B and on one axial side of the stator core 24. The fourth divided portion 30D is located on the widthwise inner side of the teeth 22 relative to the third divided portion 30C and on the other axial side of the stator core 24. The first divided portion 30A intersects with the contact surface of the insulator 16 with the winding winding portion 18, and the fourth divided portion 30D intersects with the contact surface of the insulator 16 with the teeth 22.

[0063] In this configuration, a creepage distance D is ensured along the inner surfaces of the first divided portion 30A, the second divided portion 30B, the third divided portion 30C, and the fourth divided portion 30D from the winding portion 18 (see FIG. 2) to the teeth portion 22. With this configuration, the creepage distance D can be increased by the amount corresponding to the presence of the fourth divided portion 30D.

[0064] Furthermore, when the convex portion 46 of the second insulator 16B is press-fitted into the concave portion 44 of the first insulator 16A, the first insulator 16A and the second insulator 16B can be firmly fixed together while ensuring the creepage distance D.

[0065] The first insulator 16A may have a plurality of recesses 44, and the second insulator 16B may have a plurality of protrusions 46. There may be any number of recesses 44 and any number of protrusions 46. The recesses 44 and the protrusions 46 may be aligned in the width direction of the teeth or in the radial direction of the stator core 24.

[0066] Sixth Embodiment Next, a sixth embodiment of the technique of the present disclosure will be described.

[0067] In the sixth embodiment, the configuration of the insulator 16 is changed as follows compared to the first embodiment: That is, as shown in Figures 13 to 15, the insulator 16 is divided by a first divided portion 50 and a second divided portion 52 into a first insulator 16A located on one side of the tooth portion 22 in the width direction and a second insulator 16B located on the other side of the tooth portion 22 in the width direction.

[0068] The first divided portion 50 is located on one axial side of the stator core 24 relative to the first axial end face 22A, and the second divided portion 52 is located on the other axial side of the stator core 24 relative to the second axial end face 22B.

[0069] The first divided portions 50 extend in the axial direction of the stator core 24 and divide the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the first divided portions 50 formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0070] Similarly, the second divided portions 52 extend in the axial direction of the stator core 24 and divide the first insulator 16A and the second insulator 16B in the width direction of the teeth portion 22. The inner surfaces of the second divided portions 52 formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face the teeth portion 22 in the width direction.

[0071] With this configuration, the first divided portion 50 and the second divided portion 52 can increase the creepage distance D in the axial direction of the stator core 24. Furthermore, the cross-sectional area of ​​the slots 28 can be secured, thereby improving the space factor of the winding winding portion 18. As a result, it is possible to prevent the length of the stator core 24 from increasing in all directions, including the axial direction, and therefore the physical size of the stator core 24 can be reduced.

[0072] In the sixth embodiment, the first divided portion 50 and the second divided portion 52 are located at the widthwise center of the tooth portion 22, but as shown in Figures 16 and 17, the first divided portion 50 and the second divided portion 52 may be shifted in the widthwise direction of the tooth portion 22 relative to the widthwise center of the tooth portion 22.

[0073] Seventh Embodiment Next, a seventh embodiment of the technique of the present disclosure will be described.

[0074] In the seventh embodiment, the configuration of the stator 10 is changed as follows compared to the first embodiment. That is, as shown in Figures 18 to 21, the stator component 12 includes a pair of insulating papers 60. Each insulating paper 60 is attached across the tooth portion 22 and the core back portion 20 so as to cover the tooth portion 22 and the core back portion 20 from the slot 28 side.

[0075] Each insulating paper 60 has an axial portion 62 extending in the axial direction of the stator core 24, a first locking portion 64 folded back from an end portion of the axial portion 62 on the first axial end face 22A side, and a second locking portion 66 folded back from an end portion of the axial portion 62 on the second axial end face 22B side. The first locking portion 64 is locked to the first axial end face 22A of the tooth portion 22 and the first axial end face 20A of the core back 20, and the second locking portion 66 is locked to the second axial end face 22B of the tooth portion 22 and the second axial end face 20B of the core back 20.

[0076] With this configuration, the insulating paper 60 has the first locking portion 64 and the second locking portion 66, which allows the creepage distance D to be longer in the axial direction of the stator core 24. Furthermore, the cross-sectional area of ​​the slots 28 can be secured, which improves the space factor of the winding winding portion 18. As a result, it is possible to prevent the length of the stator core 24 from increasing in all directions, including the axial direction, and therefore the physical size of the stator core 24 can be reduced.

[0077] The insulating paper 60 may have a plurality of grooves formed therein for aligning the winding portions 18 (see FIG. 2).

[0078] Eighth Embodiment Next, an eighth embodiment of the technique of the present disclosure will be described.

[0079] In the eighth embodiment, the configuration of the insulator 16 is modified as follows from the first embodiment. That is, as shown in Figures 22 and 23, the insulator 16 is formed in a continuous ring shape around the axial direction of the tooth portion 22. In other words, the insulator 16 is an integrated type without any divided portions. Furthermore, the tooth portion 22 is formed in a straight shape so that the tooth portion 22 can be inserted inside the insulator 16.

[0080] In this way, when the insulator 16 is formed in a continuous ring shape around the axial direction of the tooth portion 22, no creepage distance occurs along the dividing portion, so that, for example, compared to when a creepage distance occurs along the dividing portion, the axial length of the stator 10 is prevented from becoming longer, while the creepage distance (i.e., the creepage distance around the ring-shaped insulator 16) can be secured.

[0081] In the above-described embodiments, the stator core 24 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.

[0082] Furthermore, among the configurations described in the above embodiments, configurations that can be combined may be combined as appropriate.

[0083] 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.

[0084] 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 windings (18) wound around the plurality of tooth portions via the insulators, each of the insulators being made of resin and divided by a dividing portion (30) into a first insulator (16A) located on one axial side of the stator core and a second insulator (16B) located on the other axial side of the stator core relative to the first insulator, the dividing portion having a first dividing portion (30A) extending in the width direction of the tooth portions and a second dividing portion (30B) extending in the axial direction of the stator core. (Supplementary Note 2) The stator according to Supplementary Note 1, wherein each of the tooth portions has an axial end face (22A) that forms an end face on one axial side of the stator core, and the divided portion is located on one axial side of the stator core with respect to the axial end face. (Supplementary Note 3) The stator according to Supplementary Note 1 or Supplementary Note 2, wherein the second insulator has a protruding portion (34) that protrudes outward in a width direction of the tooth portion along the first divided portion, and a tip end of the protruding portion abuts against the winding winding portion. (Supplementary Note 4) The stator according to Supplementary Note 1 or Supplementary Note 2, wherein the first insulator has a widthwise wall portion (36) extending outward in the width direction of the tooth portion along the first divided portion, the second insulator has an axial wall portion (38) extending in the axial direction of the stator core along the second divided portion, and an extending end portion (36A) of the widthwise wall portion protrudes outward in the width direction of the tooth portion beyond the axial wall portion and abuts the winding winding portion. (Supplementary Note 5) The stator according to Supplementary Note 1, wherein the first insulator has a first axial wall portion (40) extending to the other axial side of the stator core along the second divided portion, and the second insulator has a second axial wall portion (42) extending to one axial side of the stator core along the second divided portion, and the first axial wall portion and the second axial wall portion overlap in the axial direction of the stator core.(Appendix 6) The stator according to Appendix 1, wherein the first insulator has a recess (44) recessed toward one axial side of the stator core along the second divided portion, and the second insulator has a protrusion (46) protruding toward one axial side of the stator core along the second divided portion, and the protrusion is press-fitted into the recess. (Supplementary Note 7) 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 each of the tooth portions has a first axial end face (22A) forming an end face on one axial side of the stator core and a second axial end face (22B) forming an end face on the other axial side of the stator core, and each of the insulators is divided into a first insulator (16A) located on one widthwise side of the tooth portions and a second insulator (16B) located on the other widthwise side of the tooth portions by a first divided portion (50) located on one axial side of the stator core relative to the first axial end face and a second divided portion (52) located on the other axial side of the stator core relative to the second axial end face. (Appendix 8) A stator (10) comprising: a stator core (24) having a plurality of radially extending tooth portions (22); a plurality of insulating papers (60) attached to the plurality of tooth portions; and a plurality of winding winding portions (18) wound around the plurality of tooth portions with the insulating papers interposed therebetween, wherein each of the tooth portions has a first axial end face (22A) forming an end face on one axial side of the stator core and a second axial end face (22B) forming an end face on the other axial side of the stator core, and each of the insulating papers has an axial portion (62) extending in the axial direction of the stator core, a first locking portion (64) folded back from an end of the axial portion on the first axial end face side and engaged with the first axial end face, and a second locking portion (66) folded back from an end of the axial portion on the second axial end face side and engaged with the second axial end face.(Supplementary Note 9) 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 each of the insulators, wherein each of the insulators is formed in a continuous annular shape around the axial direction of the tooth portion.

Claims

1. A stator (10) comprising: a stator core (24) having a plurality of teeth portions (22) extending radially; a plurality of insulators (16) attached to the plurality of teeth portions; and a plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators, each of the insulators being made of resin and being divided by a dividing portion (30) into a first insulator (16A) located on one axial side of the stator core and a second insulator (16B) located on the other axial side of the stator core with respect to the first insulator, the dividing portion having a first dividing portion (30A) extending in the width direction of the teeth portion and a second dividing portion (30B) extending in the axial direction of the stator core.

2. Each of the teeth portions has an axial end face (22A) forming an end face on one axial side of the stator core, and the dividing portion is located on one axial side of the stator core with respect to the axial end face. The stator according to claim 1.

3. The second insulator has a protruding portion (34) protruding outward in the width direction of the teeth portion along the first dividing portion, and a tip end portion of the protruding portion is in contact with the winding winding portion. The stator according to claim 1 or claim 2.

4. The first insulator has a width direction wall portion (36) extending outward in the width direction of the teeth portion along the first dividing portion, the second insulator has an axial direction wall portion (38) extending in the axial direction of the stator core along the second dividing portion, and an extending end portion (36A) of the width direction wall portion protrudes outward in the width direction of the teeth portion from the axial direction wall portion and is in contact with the winding winding portion. The stator according to claim 1 or claim 2.

5. The first insulator has a first axial direction wall portion (40) extending to the other axial side of the stator core along the second dividing portion, the second insulator has a second axial direction wall portion (42) extending to one axial side of the stator core along the second dividing portion, and the first axial direction wall portion and the second axial direction wall portion overlap in the axial direction of the stator core. The stator according to claim 1.

6. The first insulator has a recess (44) that is recessed toward one axial side of the stator core along the second dividing portion. The second insulator has a convex portion (46) that protrudes toward one axial side of the stator core along the second dividing portion. The convex portion is press-fitted into the recess. The stator according to claim 1.

7. A stator (10) comprising: a stator core (24) having a plurality of radially extending teeth portions (22); a plurality of insulators (16) attached to the plurality of teeth portions; and a plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators. Each of the teeth portions has a first axial end face (22A) forming an end face on one axial side of the stator core and a second axial end face (22B) forming an end face on the other axial side of the stator core. Each of the insulators is divided into a first insulator (16A) located on one side in the width direction of the teeth portion and a second insulator (16B) located on the other side in the width direction of the teeth portion by a first dividing portion (50) located on one axial side of the stator core with respect to the first axial end face and a second dividing portion (52) located on the other axial side of the stator core with respect to the second axial end face.

8. A stator (10) comprising: a stator core (24) having a plurality of radially extending teeth portions (22); a plurality of insulating papers (60) attached to the plurality of teeth portions; and a plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulating papers. Each of the teeth portions has a first axial end face (22A) forming an end face on one axial side of the stator core and a second axial end face (22B) forming an end face on the other axial side of the stator core. Each of the insulating papers has an axial portion (62) extending in the axial direction of the stator core, a first locking portion (64) folded back from an end on the first axial end face side of the axial portion and locked to the first axial end face, and a second locking portion (66) folded back from an end on the second axial end face side of the axial portion and locked to the second axial end face.

9. A stator (10) comprising: a stator core (24) having a plurality of radially extending teeth portions (22); a plurality of insulators (16) mounted on the plurality of teeth portions; and a plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators, wherein each of the insulators is formed in an annular shape continuous around the axial direction of the teeth portion.

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