Stator

Abstract

To provide a stator which can secure a creepage distance, while suppressing elongation of the length in an axial direction.SOLUTION: A stator (10) includes: a stator core (24) having a plurality of radially extending teeth parts (22); a plurality of insulators (16) mounted on the plurality of teeth parts; and a plurality of coil winding parts (18) wound around the plurality of teeth parts through each of the insulators. Each of the insulators is divided into a first insulator (16A) which is made of a resin and is positioned on one side in an axial direction of the stator core, and a second insulator (16B) positioned on the other side in the axial direction of the stator core with respect to the first insulator, by a division part (30). The division part has a first division part (30A) extending in the width direction of the teeth parts, and a second division part (30B) extending in the axial direction of the stator core.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The technology of the present disclosure relates to a stator.

Background Art

[0002] Conventionally, there is a stator including a stator core having a plurality of teeth portions extending radially, an insulator attached to the stator core, and a plurality of winding winding portions wound around the plurality of teeth portions via the insulator. Among this type of stator, there is one in which an insulator is attached to the axial end surface of the teeth portion, insulating paper is provided on the side surface of the teeth portion, and the insulator and the insulating paper overlap (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the stator having the above configuration, when a high voltage is applied to the winding winding portion, there is a concern that insulation breakdown may occur. Therefore, it is necessary to ensure a longer creepage distance from the winding winding portion to the teeth portion as the voltage increases. However, in order to ensure a longer creepage distance, if the overlap length between the insulator and the insulating paper is increased, the axial length of the stator becomes longer.

[0005] The technology of the present disclosure has been made in view of the above problems, and an object thereof is to provide a stator capable of ensuring a creepage distance while suppressing an increase in the axial length.

Means for Solving the Problems

[0006] A first aspect of the technology of the present disclosure includes 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 insulator. Each insulator is made of resin and is divided 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 by a dividing portion (30). The dividing portion has a first dividing portion (30A) extending in the width direction of the tooth portion and a second dividing portion (30B) extending in the axial direction of the stator core. It is a stator (10).

[0007] A second aspect of the technology of the present disclosure includes 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 insulator. Each tooth portion 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 insulator is divided into a first insulator (16A) located on one side in the width direction of the tooth portion and a second insulator (16B) located on the other side in the width direction of the tooth 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. It is a stator (10).

[0008] A third aspect of the technology of the present disclosure includes a stator core (24) having a plurality of radially extending teeth (22), a plurality of insulating papers (60) attached to the plurality of teeth, and a plurality of winding winding portions (18) wound around the plurality of teeth via the respective insulating papers. Each of the teeth 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 in 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 in the axial portion and locked to the second axial end face. This is the stator (10).

[0009] A fourth aspect of the technology of the present disclosure includes a stator core (24) having a plurality of radially extending teeth (22), a plurality of insulators (16) attached to the plurality of teeth, and a plurality of winding winding portions (18) wound around the plurality of teeth via the respective insulators. Each of the insulators is formed in an annular shape continuous around the axial direction of the teeth. This is the stator (10).

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

Brief Description of the Drawings

[0011]

Figure 1

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Figure 10

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Figure 12

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Figure 18

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Figure 23

Best Mode for Carrying Out the Invention

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

[0013] As shown in FIG. 1, the stator 10 according to the first embodiment includes a plurality of stator constituent members 12. The stator 10 is configured by combining the plurality of stator constituent members 12 in an annular shape. FIG. 1 shows half of the configuration of the stator 10. The stator 10 is applied to a brushless motor. The brushless motor may be used for any application. Examples of the brushless motor include a fan motor, a pump drive motor, and a compressor motor.

[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. Further, 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 described later are the same as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0015] As shown in FIG. 2, each stator constituent member 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 a tooth portion 22. The core back portion 20 extends in the circumferential direction of the stator core 24, and the tooth portion 22 extends from the central portion of the core back portion 20 toward the radially inner side of the stator core 24. The tip end portion of the tooth portion 22 is a free end, and the base end portion of the tooth portion 22 is 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 annularly. In the state where the stator core 24 is formed, a plurality of core back portions 20 form an annular portion 26 (see FIG. 1), and a plurality of teeth portions 22 extend radially about the center of the stator core 24. Slots 28 are formed between the plurality of teeth portions 22.

[0017] Note that, although the configuration including the details of each stator constituent member 12 is not strictly symmetric with respect to the tangential direction of the stator 10 when viewed from the axial direction of the stator 10, hereinafter, for the sake of convenience, it is assumed that the main configuration of each stator constituent member 12 is symmetric with respect to the tangential direction of the stator 10 when viewed from the axial direction of the stator 10, and the configuration on one side of each stator constituent member 12 will be described.

[0018] The insulator 16 is attached to the core member 14. Specifically, the insulator 16 is attached to the teeth portion 22 so as to surround the circumference in the axial direction of the teeth portion 22. The insulator 16 is made of resin. Examples of the resin forming the insulator 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). Any resin may be used to form the insulator 16.

[0019] The winding winding portion 18 is wound around the teeth portion 22 with the insulator 16 interposed therebetween. The winding winding portion 18 is formed by winding a winding around the teeth portion 22 in the circumferential direction of the diameter 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] As shown in FIGS. 3 and 4, the tooth 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 the "axial end face" in the present disclosure. In the figures after FIG. 3, the illustration of the winding winding portion 18 is omitted.

[0021] The insulator 16 is divided by the 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 with respect to the first insulator 16A. The dividing portion 30 has a first dividing portion 30A and a second dividing portion 30B.

[0022] The first dividing portion 30A extends in the width direction (i.e., the X 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 first dividing portion 30A 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.

[0023] The second dividing 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 tooth portion 22. The inner surfaces of the second dividing portion 30B formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the tooth portion 22.

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

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

[0026] Thus, when the dividing portion 30 is formed in a bent shape having the first dividing portion 30A and the second dividing portion 30B, for example, compared with the case where the dividing portion 30 is formed linearly in the width direction of the teeth portion 22 or the case where the dividing portion 30 is formed linearly in the axial direction of the stator core 24, it is possible to secure the creepage distance D while suppressing an increase in the axial length of the stator 10.

[0027] Further, when the dividing portion 30 is located on one axial side of the stator core 24 with respect to the first axial end face 22A, the creepage distance D can be made longer, for example, compared with the case where the dividing portion 30 is located outside the width direction of the teeth portion 22.

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

[0029] The motor housing 102 is provided with a first bearing 114, and the housing 104 is provided with a second bearing 116. 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 secure the above-described creepage distance D, the axial length of the stator 10 increases. However, since the increased portion is accommodated in the dead space 120, an increase in the axial length of the motor 100 can be suppressed.

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

[0032] In the second embodiment, the configuration of the insulator 16 is changed as follows with respect to the first embodiment. That is, as shown in FIG. 6, the second insulator 16B has a protruding portion 34 that protrudes outward in the width direction of the tooth portion 22 along the first divided portion 30A. The tip of the protruding portion 34 is in contact with the winding winding portion 18 (see FIG. 2). In this configuration, the creepage distance D is secured along the inner surfaces of the first divided portion 30A and the second divided portion 30B from the winding winding portion 18 to the tooth portion 22.

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

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

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

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

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

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

[0039] In the fourth embodiment, the configuration of the insulator 16 is changed as follows with respect to the first embodiment. That is, as shown in FIG. 8, the dividing portion 30 has a first dividing portion 30A that extends in the width direction of the tooth portion 22, a second dividing portion 30B that extends in the axial direction of the stator core 24, and a third dividing portion 30C that extends in the width direction of the tooth portion 22.

[0040] The first dividing portion 30A 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 first dividing portion 30A 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.

[0041] The second dividing 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 second dividing portion 30B formed in the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the teeth portion 22.

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

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

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

[0045] The first insulator 16A has a first axial wall portion 40 that extends toward the other axial side of the stator core 24 along the second dividing portion 30B, and the second insulator 16B has a second axial wall portion 42 that extends toward one axial side of the stator core 24 along the second dividing portion 30B. The second axial wall portion 42 is located on the outer side in the width direction of the tooth portion 22 with respect 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, an creepage distance D is ensured along the inner surfaces of the first dividing portion 30A, the second dividing portion 30B, and the third dividing portion 30C from the winding winding portion 18 to the tooth portion 22.

[0046] Thus, when the first insulator 16A has the first axial wall portion 40 that extends toward the other axial side of the stator core 24 along the second dividing portion 30B, the second insulator 16B has the second axial wall portion 42 that extends toward one axial side of the stator core 24 along the second dividing 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 of overlap between the first axial wall portion 40 and the second axial wall portion 42.

[0047] In the fourth embodiment, the dividing portion 30 is located on one axial side of the stator core 24 with respect to the first axial end face 22A. However, as shown in FIG. 9, the dividing portion 30 may be located on the other axial side of the stator core 24 with respect to the first axial end face 22A (in other words, on the outer side in the width direction of the tooth portion 22 rather than the side surface 22C on the outer side in the width direction of the tooth portion 22).

[0048] Also, in the fourth embodiment, the second axial wall portion 42 is located on the outer side in the width direction of the tooth portion 22 with respect to the first axial wall portion 40. However, as shown in FIG. 10, the second axial wall portion 42 may be located on the inner side in the width direction of the tooth portion 22 with respect to the first axial wall portion 40.

[0049] Further, as shown in FIG. 11, in a configuration where the dividing portion 30 is located on one axial side of the stator core 24 with respect to the first axial end face 22A, the second axial wall portion 42 may be located on the inner side in the width direction of the teeth portion 22 with respect to the first axial wall portion 40.

[0050] Further, as shown in FIG. 11, the dividing portion 30 may have a first dividing portion 30A extending in the width direction of the teeth 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 teeth portion 22, and a fourth dividing portion 30D extending in the axial direction of the stator core 24.

[0051] The fourth dividing 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 first insulator 16A and the second insulator 16B formed with the fourth dividing portion 30D extend in the axial direction of the stator core 24 and face each other in the width direction of the teeth portion 22.

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

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

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

[0055] In the fifth embodiment, the configuration of the insulator 16 is changed as follows with respect to 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 dividing portion 30B, and the second insulator 16B has a convex portion 46 that protrudes toward one axial side of the stator core 24 along the second dividing portion 30B. The convex portion 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 dividing portion 30A 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 first dividing portion 30A 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.

[0058] The second dividing 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 tooth portion 22. The inner surfaces of the second dividing portion 30B formed on the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the tooth portion 22.

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

[0060] The fourth dividing 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 dividing portion 30D formed in the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the teeth portion 22.

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

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

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

[0064] Also, 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 while ensuring the creepage distance D.

[0065] Note that the first insulator 16A may have a plurality of concave portions 44, and the second insulator 16B may have a plurality of convex portions 46. The number of the plurality of concave portions 44 and the number of the plurality of convex portions 46 may be any number. The plurality of concave portions 44 and the plurality of convex portions 46 may be arranged side by side in the width direction of the teeth, or may be arranged side by side in the radial direction of the stator core 24.

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

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

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

[0069] The first dividing portion 50 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 tooth portion 22. The inner surfaces of the first dividing portion 50 formed in the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the tooth portion 22.

[0070] Similarly, the second dividing portion 52 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 tooth portion 22. The inner surfaces of the second dividing portion 52 formed in the first insulator 16A and the second insulator 16B extend in the axial direction of the stator core 24 and face each other in the width direction of the tooth portion 22.

[0071] With such a configuration, the creepage distance D can be lengthened in the axial direction of the stator core 24 by the first dividing portion 50 and the second dividing portion 52. Also, since the cross-sectional area of the slot 28 can be secured, the space factor of the winding winding portion 18 can be improved. As a result, it is possible to suppress an increase in the length of the stator core 24 in each direction including the axial direction, and thus the size of the stator core 24 can be reduced.

[0072] In the sixth embodiment, the first dividing portion 50 and the second dividing portion 52 are located at the center in the width direction of the tooth portion 22. However, as shown in FIGS. 16 and 17, the first dividing portion 50 and the second dividing portion 52 may be displaced in the width direction of the tooth portion 22 with respect to the center in the width direction of the tooth portion 22.

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

[0074] In the seventh embodiment, the configuration of the stator 10 is changed as follows with respect to the first embodiment. That is, as shown in FIGS. 18 to 21, the stator component 12 includes a pair of insulating papers 60. Each insulating paper 60 is mounted 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 side of the slot 28.

[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 on the side of the first axial end face 22A in the axial portion 62, and a second locking portion 66 folded back from an end portion on the side of the second axial end face 22B in the axial portion 62. 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 such a configuration, since the insulating paper 60 has the first locking portion 64 and the second locking portion 66, the creepage distance D can be lengthened in the axial direction of the stator core 24. Also, since the cross-sectional area of the slot 28 can be ensured, the space factor of the winding winding portion 18 can be improved. As a result, it is possible to suppress an increase in the length of the stator core 24 in each direction including the axial direction, and thus the size of the stator core 24 can be reduced.

[0077] Note that a plurality of grooves for aligning the winding winding portion 18 (see FIG. 2) may be formed in the insulating paper 60.

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

[0079] In the eighth embodiment, the configuration of the insulator 16 is changed as follows with respect to the first embodiment. That is, as shown in FIGS. 22 and 23, the insulator 16 is formed in an annular shape continuous around the axial direction of the teeth portion 22. That is, the insulator 16 is an integral type without a dividing portion. Further, the teeth portion 22 is formed in a straight shape so that the teeth portion 22 can be inserted inside the insulator 16.

[0080] In this way, when the insulator 16 is formed in an annular shape continuous around the axial direction of the teeth portion 22, there is no creeping distance along the dividing portion. Therefore, for example, compared with the case where a creeping distance along the dividing portion occurs, while suppressing an increase in the axial length of the stator 10, a creeping distance (that is, a creeping distance that wraps around the annular insulator 16) can be secured.

[0081] In addition, in each of the above embodiments, the stator core 24 is divided into a plurality of core members 14, but a configuration in which the plurality of core members 14 are integrated may also be used. Further, the insulators 16 attached to the respective core members 14 may also be integrated.

[0082] Moreover, among the configurations described in each of the above embodiments, configurations that can be combined may be appropriately combined.

[0083] Although one embodiment of the technology of the present disclosure has been described above, the present invention is not limited to the above, and it goes without saying that various modifications can be made and implemented within the scope not departing from the gist thereof.

[0084] Hereinafter, an appended note regarding the technology of the present disclosure is shown. (Appended Note 1) 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, A plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators, Comprising, Each of the insulators is made of resin and is 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 has a first dividing portion (30A) extending in the width direction of the tooth portion and a second dividing portion (30B) extending in the axial direction of the stator core. Stator (10). (Appendix 2) Each of the tooth portions has an axial end face (22A) that forms an end face on one axial side of the stator core. The dividing portion is located on one axial side of the stator core with respect to the axial end face. The stator according to Appendix 1. (Appendix 3) The second insulator has a protruding portion (34) that protrudes outward in the width direction of the tooth portion along the first dividing portion. The tip of the protruding portion is in contact with the winding winding portion. The stator according to Appendix 1 or Appendix 2. (Appendix 4) The first insulator has a width-direction wall portion (36) that extends outward in the width direction of the tooth portion along the first dividing portion. The second insulator has an axial-direction wall portion (38) that extends in the axial direction of the stator core along the second dividing portion. The extending end portion (36A) of the width-direction wall portion protrudes outward in the width direction of the tooth portion from the axial-direction wall portion and is in contact with the winding winding portion. The stator according to Appendix 1 or Appendix 2. (Appendix 5) The first insulator has a first axial-direction wall portion (40) that extends 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) that extends to one axial side of the stator core along the second dividing portion. The first axial wall portion and the second axial wall portion overlap in the axial direction of the stator core. The stator according to Appendix 1. (Appendix 6) The first insulator has a recess (44) that is recessed toward one side in the axial direction of the stator core along the second divided portion. The second insulator has a convex portion (46) that protrudes toward one side in the axial direction of the stator core along the second divided portion. The convex portion is press-fitted into the recess. The stator according to Appendix 1. (Appendix 7) 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, A plurality of winding winding portions (18) wound around the plurality of teeth portions via each insulator, Comprising, Each of the teeth portions has a first axial end face (22A) forming an end face on one side in the axial direction of the stator core and a second axial end face (22B) forming an end face on the other side in the axial direction 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 divided portion (50) located on one side in the axial direction of the stator core with respect to the first axial end face and a second divided portion (52) located on the other side in the axial direction of the stator core with respect to the second axial end face. Stator (10). (Appendix 8) A stator core (24) having a plurality of teeth portions (22) extending radially, A plurality of insulating papers (60) attached to the plurality of teeth portions, A plurality of winding winding portions (18) wound around the plurality of teeth portions via each insulating paper, Comprising, Each of the tooth portions has a first axial end face (22A) that forms an end face on one axial side of the stator core and a second axial end face (22B) that forms 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 portion on the first axial end face side in the axial portion and locked to the first axial end face, and a second locking portion (66) folded back from an end portion on the second axial end face side in the axial portion and locked to the second axial end face. Stator (10). (Appendix 9) 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, A plurality of winding winding portions (18) wound around the plurality of tooth portions via each of the insulators, Comprising Each of the insulators is formed in an annular shape continuous around the axial direction of the tooth portion. Stator (10).

Description of Reference Numerals

[0085] 10… Stator, 12… Stator component, 14… Core member, 16… Insulator, 16A… First insulator, 16B… Second insulator, 18… Coil winding part, 20… Core back part, 22… Tooth part, 22A… First axial end face, 22B… Second axial end face, 22C… Side face, 24… Stator core, 26… Annular part, 28… Slot, 30… Division part, 30A… First division part, 30B… Second division part, 30C… Third division part, 34… Protrusion, 36… Width direction wall part, 36A… Extended end part, 38… Axial direction wall part, 40… First axial direction wall part, 42… Second axial direction wall part, 44… Recess, 46… Protrusion, 50… First division part, 52… Second division part, 60… Insulating paper, 62… Axial direction part, 64… First locking part, 66… Second locking part, 100… Motor, 102… Motor housing, 104… Housing, 106… Rotor, 108… Shaft, 110… Rotor core, 112… Rotor magnet, 114… First bearing, 116… Second bearing, 120… Dead space

Claims

1. 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; A plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators; Comprising: Each of the insulators is made of resin and is 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 has 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. Stator (10).

2. Each of the teeth portions has an axial end face (22A) forming an end face on one axial side of the stator core. 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. The tip of the protruding portion abuts against 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. The extending end portion (36A) of the width direction wall portion protrudes outward in the width direction of the teeth portion with respect to the axial direction wall portion and abuts against 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. 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 recessed portion (44) recessed to 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 concave portion. The stator according to claim 1.

7. 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, A plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators, Comprising, Each of the teeth portions has a first axial end surface (22A) that forms an end surface on one axial side of the stator core and a second axial end surface (22B) that forms an end surface 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 surface and a second dividing portion (52) located on the other axial side of the stator core with respect to the second axial end surface. Stator (10).

8. A stator core (24) having a plurality of teeth portions (22) extending radially, A plurality of insulating papers (60) attached to the plurality of teeth portions, A plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulating papers, Comprising, Each of the teeth portions has a first axial end surface (22A) that forms an end surface on one axial side of the stator core and a second axial end surface (22B) that forms an end surface 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 surface side in the axial portion and locked to the first axial end surface, and a second locking portion (66) folded back from an end on the second axial end surface side in the axial portion and locked to the second axial end surface. Stator (10).

9. 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, A plurality of winding winding portions (18) wound around the plurality of teeth portions via the respective insulators, Comprising, Each of the insulators is formed in an annular shape that is continuous around the axial direction of the teeth portion. Stator (10).

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