Stator of rotating electrical machine

Abstract

To improve the reliability of a rotating electrical machine.SOLUTION: The support face 85 of insertion plates 68, 77 supports an insulating member 46 from the radial inside of a yoke as the insertion plates 68, 77 are inserted into a gap between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke. In this case, the support face 85 is located on the radially outside of the yoke from a slot open 31 when seen from the axial direction of the yoke, so that the insulating member 46 is restricted from getting closer to the slot open 31 than that. Therefore, it is made easy to secure an insulation distance between each of tooth flanges 27 located on both sides across the slot open 31 and the coil 28. As a result, insulation between each of tooth flanges 27 located on both sides across the slot open 31 and the coil 28 is suppressed from becoming inferior.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a stator for a rotating electric machine. [Background technology]

[0002] For example, as disclosed in Patent Document 1, a stator of a rotating electric machine includes a stator core, a coil, and an insulator. The stator core has a cylindrical yoke and a plurality of teeth. Each tooth extends from the inner peripheral surface of the yoke toward the inside in the radial direction of the yoke. The stator core has slots formed between adjacent teeth in the circumferential direction of the yoke.

[0003] Each tooth has a tooth extension portion and a tooth flange portion. The tooth extension portion extends from an inner peripheral surface of the yoke. The tooth flange portions protrude in the circumferential direction of the yoke from each of the tooth side surfaces located on both sides of the tooth extension portion in the circumferential direction of the yoke. The coil is formed by winding a wire around the stator core. The coil includes a coil end protruding from a core end face, which is an end face of the stator core located in the axial direction of the yoke. The insulator is disposed opposite the core end face of the stator core. The insulator provides insulation between the coil end and the core end face.

[0004] The insulator has a cylindrical insulator base, a plurality of insulator extensions, and an insulator inner wall. The insulator base is disposed at a position overlapping the coil end radially outside the yoke. Each insulator extension extends from the inner peripheral surface of the insulator base toward the radially inside of the insulator base. Each insulator extension is disposed at a position overlapping each tooth extension in the axial direction of the yoke. The insulator inner wall protrudes from each insulator extension and is disposed at a position overlapping the tooth flange in the axial direction of the yoke, and at a position overlapping the coil end radially inside the yoke. Incidentally, such a rotating electric machine stator may be provided with a cover member disposed opposite the insulator.

[0005] The coil is formed by winding a wire passing through the slot around the tooth extension and the insulator extension. The stator includes a slot insulating portion and an insulating member. The slot insulating portion extends along the inner peripheral surface of the yoke and the side surfaces of the teeth adjacent in the circumferential direction of the yoke, and provides insulation between the stator core and the coil within the slot. The insulating member is arranged in a state in which it straddles the slot opening, which is the gap between the tooth flange portions adjacent in the circumferential direction of the yoke, in the circumferential direction of the yoke. The insulating member provides insulation between the coil and each of the tooth flange portions located on both sides of the slot opening. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-72128 A Summary of the Invention [Problem to be solved by the invention]

[0007] In such a rotating electric machine stator, the closer the insulating member is to the slot opening, the more difficult it becomes to ensure the insulation distance between the coil and each of the teeth flanges located on both sides of the slot opening. This may result in poor insulation between the coil and each of the teeth flanges located on both sides of the slot opening. This reduces the reliability of the rotating electric machine stator. [Means for solving the problem]

[0008] A stator for a rotating electric machine that solves the above-mentioned problems includes a stator core having a cylindrical yoke and a plurality of teeth extending radially inward from an inner peripheral surface of the yoke, with slots formed between adjacent teeth in the circumferential direction of the yoke, a coil formed by winding a winding around the stator core and including coil ends protruding from a core end face, which is an end face of the stator core located in the axial direction of the yoke, an insulator disposed opposite the core end face and providing insulation between the coil ends and the core end face, and and a cover member disposed opposite the insulator, each of the teeth having a teeth extension portion extending from an inner circumferential surface of the yoke and a teeth flange portion protruding in the circumferential direction from each of teeth side surfaces located on both sides of the circumferential direction of the yoke at the teeth extension portion, the insulator having a cylindrical insulator base portion disposed at a position overlapping with the coil end on the radially outer side, and a cover member disposed opposite the insulator, the cover member extending from an inner circumferential surface of the insulator base toward the radially inner side of the insulator base and overlapping with each of the teeth extension portions in the axial direction. and an insulator inner wall protruding from each of the insulator extensions and positioned to overlap the tooth flange portion in the axial direction and to overlap the coil end on the radially inner side of the yoke, the coil being formed by winding a wire passing through the slots around the tooth extensions and the insulator extensions, extending along an inner peripheral surface of the yoke and adjacent tooth side surfaces in the circumferential direction, and insulating the stator core and the coil within the slots. a slot insulating portion bordering the coil and an insulating member arranged in a circumferential direction straddling a slot opening, which is a gap between adjacent tooth flange portions in the circumferential direction, and providing insulation between the coil and each of the tooth flange portions located on both sides of the slot opening, wherein the cover member has an insertion plate portion extending in the axial direction, the insertion plate portion is inserted into a space between adjacent insulator inner walls in the circumferential direction, and has a support surface that supports the insulating member from the radially inner side, and the support surface has a shape that, when viewed from the axial direction,The slot opening is located radially outward.

[0009] According to this, the insertion plate portion is inserted into the space between the insulator inner walls adjacent in the circumferential direction of the yoke, and the support surface of the insertion plate portion supports the insulating member from the radial inside of the yoke. At this time, since the support surface is located radially outward of the slot opening when viewed from the axial direction of the yoke, the insulating member is restricted from approaching the slot opening any further. Therefore, it is easy to ensure the insulation distance between each of the teeth flange portions located on both sides of the slot opening and the coil. As a result, insulation failure between each of the teeth flange portions located on both sides of the slot opening and the coil can be suppressed, and the reliability of the stator of the rotating electric machine can be improved.

[0010] In the stator of the above-mentioned rotating electric machine, the slot insulation portion has a pair of protruding portions that protrude toward each other from each of the tooth side surfaces adjacent to each other in the circumferential direction, and that provide insulation between the coil and each of the tooth flange portions located on both sides of the slot opening, and each of the protruding portions and the insulating member may overlap in the radial direction.

[0011] With this, since the protruding portions of the slot insulation portion and the insulating member overlap in the radial direction of the yoke, it is easier to lengthen the insulation distance between the coil and each of the teeth flanges located on both sides of the slot opening, compared to when there are no protruding portions. As a result, it is easier to prevent insulation failure between the coil and each of the teeth flanges located on both sides of the slot opening, and the reliability of the stator of the rotating electric machine can be further improved.

[0012] In the stator of the above-mentioned rotating electric machine, the insulating member has a first insulating portion that provides insulation between one of the tooth flange portions located on both sides of the slot opening and one of the coils adjacent in the circumferential direction within the slot, a second insulating portion that provides insulation between the other of the tooth flange portions located on both sides of the slot opening and the other of the coils adjacent in the circumferential direction within the slot, and a third insulating portion that connects the first insulating portion and the second insulating portion and has a V-shaped cross section and insulates the coils adjacent in the circumferential direction within the slot, and the insertion plate portion may have a retaining portion that retains the amount of opening of the third insulating portion to maintain the circumferential separation distance between a first connection portion that is a connection point between the first insulating portion and the third insulating portion, and a second connection portion that is a connection point between the second insulating portion and the third insulating portion.

[0013] This makes it possible to maximize the distance from the slot open to the edge of the first insulating part opposite the connection point with the third insulating part, and the distance from the slot open to the edge of the second insulating part opposite the connection point with the third insulating part. This makes it easier to increase the insulation distance between the coil and each of the teeth flange parts located on both sides of the slot open. As a result, it becomes easier to prevent insulation failure between the coil and each of the teeth flange parts located on both sides of the slot open, and thus the reliability of the stator of the rotating electric machine can be further improved.

[0014] In the stator of the above-mentioned rotating electric machine, it is preferable that the insertion plate portion is not inserted between adjacent teeth in the circumferential direction and is separated from the stator core in the axial direction of the yoke.

[0015] According to this, the support surface of the insertion plate portion supports only the portion protruding from the slot in the insulating member into the space between the adjacent inner walls of the insulator in the circumferential direction of the yoke from the radial inside of the yoke. Therefore, since the insertion plate portion is separated from the stator core, it is possible to avoid a problem in that, for example, when the rotating electric machine vibrates, the insertion plate portion comes into contact with the stator core, causing friction between the insertion plate portion and the stator core. This improves the durability of the stator of the rotating electric machine, and as a result, the reliability of the stator of the rotating electric machine can be further improved.

[0016] In the stator of the above-mentioned rotating electric machine, it is preferable that the insertion plate portion passes through a space between adjacent inner walls of the insulator in the circumferential direction and is inserted into between adjacent teeth in the circumferential direction.

[0017] According to this, the support surface of the insertion plate portion supports not only the portion of the insulating member protruding from the slot into the space between the insulator inner walls adjacent in the circumferential direction of the yoke, but also the portion of the insulating member located within the slot from the radial inside of the yoke. Therefore, the support surface of the insertion plate portion can stably support the insulating member from the radial inside of the yoke. This makes it easier to prevent the insulating member from approaching the slot opening any further. This makes it easier to ensure the insulation distance between each of the teeth flange portions located on both sides of the slot opening and the coil. As a result, it is easier to prevent insulation failure between each of the teeth flange portions located on both sides of the slot opening and the coil, thereby further improving the reliability of the stator of the rotating electric machine. Effect of the Invention

[0018] According to the present invention, the reliability of the stator of the rotating electrical machine can be improved. [Brief description of the drawings]

[0019] [Figure 1]FIG. 1 is a cross-sectional view showing an electric compressor according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the rotating electric machine. [Diagram 3] FIG. 3 is an exploded perspective view showing the stator core, the first insulator, and the second insulator. [Figure 4] FIG. 4 is a perspective view of the stator illustrating a state before the first cover member is disposed on the first insulator. [Diagram 5] FIG. 5 is a perspective view of the stator illustrating a state in which the first cover member is disposed relative to the first insulator. [Figure 6] FIG. 6 is an enlarged perspective view showing the insertion recess and the locking protrusion of the yoke. [Figure 7] FIG. 7 is an enlarged perspective view of the insertion recess of the second insulator. [Figure 8] FIG. 8 is a perspective view of the stator illustrating a state before the second cover member is disposed relative to the second insulator. [Figure 9] FIG. 9 is a perspective view of the stator illustrating a state in which the second cover member is disposed relative to the second insulator. [Figure 10] FIG. 10 is a cross-sectional view showing a portion of the stator. [Figure 11] FIG. 11 is a cross-sectional view showing a portion of the stator. [Figure 12] FIG. 12 is an enlarged perspective view of a locking piece of the first cover member. [Figure 13] FIG. 13 is a perspective view showing the relationship between the locking piece and the insertion recess. [Figure 14] FIG. 14 is a perspective view for explaining an insertion plate portion of the first cover member. [Figure 15] FIG. 15 is a cross-sectional view for explaining the relationship between the insertion plate portion, the space forming wall, the locking piece, and the insertion recessed portion. [Figure 16] FIG. 16 is a perspective view for explaining the insertion plate portion and the locking piece of the second cover member. [Figure 17]FIG. 17 is an enlarged perspective view showing the insertion plate portion and the locking protrusion portion of the second cover member. [Figure 18] FIG. 18 is a cross-sectional view showing the relationship between the insertion recess and the locking piece. [Figure 19] FIG. 19 is a cross-sectional view for explaining the relationship between the insertion plate portion, the space forming wall, the locking piece, and the insertion recessed portion. [Figure 20] FIG. 20 is a perspective view for explaining an insertion plate portion in a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a specific embodiment of a stator for a rotating electric machine will be described with reference to Fig. 1 to Fig. 19. The stator for the rotating electric machine of this embodiment constitutes a part of an electric compressor. The electric compressor is used in, for example, a vehicle air conditioner.

[0021] <Basic configuration of electric compressor> As shown in Fig. 1, the electric compressor 10 includes a cylindrical housing 11. The housing 11 includes a discharge housing 12, a motor housing 13, and an inverter case 14. The discharge housing 12, the motor housing 13, and the inverter case 14 are made of a metal material. The discharge housing 12, the motor housing 13, and the inverter case 14 are made of aluminum, for example.

[0022] The motor housing 13 has an end wall 13a and a peripheral wall 13b. The end wall 13a is plate-shaped. The peripheral wall 13b extends cylindrically from the outer periphery of the end wall 13a. The discharge housing 12 is cylindrical. The discharge housing 12 is connected to an end of the peripheral wall 13b of the motor housing 13 opposite the end wall 13a. The inverter case 14 is cylindrical. The inverter case 14 is connected to the end wall 13a of the motor housing 13. The end wall 13a of the motor housing 13 and the inverter case 14 define an inverter chamber S1.

[0023] The motor housing 13 has a boss portion 13c. The boss portion 13c is cylindrical. The boss portion 13c protrudes from the center of the end surface of the end wall 13a of the motor housing 13 on the peripheral wall 13b side. The axis of the boss portion 13c coincides with the axis of the peripheral wall 13b of the motor housing 13. In addition, a hole 13h is formed in the end wall 13a of the motor housing 13. The hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction. The hole 13h is located closer to the peripheral wall 13b than the boss portion 13c.

[0024] The motor housing 13 has a suction port 13d. The suction port 13d is formed in a portion of the peripheral wall 13b of the motor housing 13 near the end wall 13a. The suction port 13d communicates between the inside and the outside of the motor housing 13. A refrigerant as a fluid is drawn into the suction port 13d from the outside.

[0025] The electric compressor 10 includes a rotating shaft 15, a compression unit 16, an inverter 17, and a rotating electric machine 20. The rotating shaft 15, the compression unit 16, and the rotating electric machine 20 are accommodated in a motor housing 13. Thus, the housing 11 accommodates the rotating electric machine 20. The rotating shaft 15 is disposed in the motor housing 13 with the axis of the rotating shaft 15 coinciding with the axis of a peripheral wall 13b of the motor housing 13. The inverter 17 is accommodated in an inverter chamber S1.

[0026] The compression unit 16 and the rotating electric machine 20 are arranged side by side in the axial direction, which is the direction in which the axis of the rotating shaft 15 extends. The rotating electric machine 20 is arranged closer to the end wall 13a of the motor housing 13 than the compression unit 16. The compression unit 16, the rotating electric machine 20, and the inverter 17 are arranged side by side in this order in the axial direction of the rotating shaft 15.

[0027] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is disposed between the compression unit 16 and the rotating electric machine 20. Thus, the shaft support member 18 serves as a partition wall between the rotating electric machine 20 and the compression unit 16. A motor chamber S2 is defined by the shaft support member 18 and the end wall 13a and peripheral wall 13b of the motor housing 13. Thus, the housing 11 has the motor chamber S2. The motor chamber S2 accommodates the rotating electric machine 20. Refrigerant is drawn into the motor chamber S2 through a suction port 13d.

[0028] The shaft support member 18 has an insertion hole 18h. The insertion hole 18h is formed in the center of the shaft support member 18. The axis of the insertion hole 18h coincides with the axis of the boss portion 13c. A first end of the rotating shaft 15 is inserted into the insertion hole 18h. A radial bearing 19a is provided between the insertion hole 18h and the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported by the shaft support member 18 via the radial bearing 19a. In addition, a second end of the rotating shaft 15 is inserted inside the boss portion 13c. A radial bearing 19b is provided between the boss portion 13c and the second end of the rotating shaft 15. The second end of the rotating shaft 15 is rotatably supported by the boss portion 13c via the radial bearing 19b.

[0029] The compression section 16 includes a fixed scroll 16a and a rotating scroll 16b. The fixed scroll 16a is fixed to the motor housing 13. The rotating scroll 16b is disposed opposite to the fixed scroll 16a. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant. A volume-changeable compression chamber S3 is defined between the fixed scroll 16a and the rotating scroll 16b. A discharge chamber S4 is defined between the fixed scroll 16a and the discharge housing 12. The refrigerant compressed by the change in volume of the compression chamber S3 is discharged to the discharge chamber S4. The rotating electric machine 20 rotates the rotary shaft 15. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant by the rotation of the rotary shaft 15.

[0030] <Outline of rotating electrical machine configuration> The rotating electric machine 20 includes a rotor 21 and a stator 22. The stator 22 is cylindrical. The rotor 21 is disposed inside the stator 22. The rotor 21 includes a cylindrical rotor core 21a and a plurality of permanent magnets (not shown) embedded in the rotor core 21a. The rotor core 21a is fixed to the rotating shaft 15. The rotor core 21a is configured to be rotatable integrally with the rotating shaft 15.

[0031] <Stator core> The stator 22 includes a stator core 23. The stator core 23 is fixed to the inner circumferential surface of the peripheral wall 13b of the motor housing 13. Therefore, the stator core 23 is fixed to the housing 11. The stator 22 is assembled to the housing 11 by fitting the stator core 23 into the inner circumferential surface of the peripheral wall 13b of the motor housing 13 by, for example, shrink fitting. The axis of the stator core 23 coincides with the axis of the rotating shaft 15. Therefore, the axial direction of the stator core 23 coincides with the axial direction of the rotating shaft 15.

[0032] 2 and 3, the stator core 23 has a yoke 24 and a plurality of teeth 25. The yoke 24 is cylindrical. The stator core 23 is fixed to the motor housing 13 by fitting the outer peripheral surface of the yoke 24 into the inner peripheral surface of the peripheral wall 13b of the motor housing 13. The axial direction of the yoke 24 is also the axial direction of the stator core 23.

[0033] The teeth 25 extend from the inner peripheral surface 24a of the yoke 24 toward the radially inward direction of the yoke 24. The teeth 25 are arranged at intervals in the circumferential direction of the yoke 24. The teeth 25 are arranged at equal intervals in the circumferential direction of the yoke 24. The circumferential direction of the yoke 24 is also the circumferential direction of the stator core 23. Each tooth 25 extends from the inner peripheral surface 24a of the yoke 24 toward the axis of the stator core 23. In this embodiment, the stator core 23 has 15 teeth 25. The number of teeth 25 is not particularly limited, but the number of teeth 25 is a multiple of three.

[0034] As shown in Fig. 3, both end faces of the yoke 24 located in the axial direction are flat. Both end faces of the yoke 24 located in the axial direction of each tooth 25 are flat. The axial length of the yoke 24 is the same as the axial length of the yoke 24 of each tooth 25. The end face located on one side of the axial direction of the yoke 24 is located on the same plane as the end face located on one side of the axial direction of the yoke 24 of each tooth 25. The end face located on the other side of the axial direction of the yoke 24 is located on the same plane as the end face located on the other side of the axial direction of the yoke 24 of each tooth 25.

[0035] The end face located on one side of the axial direction of the yoke 24 and the end face located on one side of the axial direction of the yoke 24 of each tooth 25 form a first core end face 23a located on one side of the axial direction of the yoke 24 of the stator core 23. The end face located on the other side of the axial direction of the yoke 24 and the end face located on the other side of the axial direction of the yoke 24 of each tooth 25 form a second core end face 23b located on the other side of the axial direction of the yoke 24 of the stator core 23. Therefore, the stator core 23 has a first core end face 23a and a second core end face 23b. The first core end face 23a is a core end face located on one side of the axial direction of the yoke 24 of the stator core 23. The second core end face 23b is a core end face located on the other side of the axial direction of the yoke 24 of the stator core 23.

[0036] As shown in FIG. 1, the stator core 23 is arranged within the motor housing 13 so that the first core end face 23a faces the shaft support member 18 in the axial direction of the rotating shaft 15 and the second core end face 23b faces the end wall 13a of the motor housing 13 in the axial direction of the rotating shaft 15.

[0037] As shown in FIG. 2 and FIG. 3, each tooth 25 has a tooth extension portion 26 and a tooth flange portion 27. The tooth extension portion 26 is a thin plate extending from the inner peripheral surface 24a of the yoke 24. The tooth extension portion 26 extends from the first core end surface 23a to the second core end surface 23b of the stator core 23. Each tooth extension portion 26 has a tooth side surface 26a located on both sides of the tooth extension portion 26 in the circumferential direction of the yoke 24. Each tooth side surface 26a is continuous with the inner peripheral surface 24a of the yoke 24. The tooth flange portion 27 protrudes in the circumferential direction of the yoke 24 from the end of each tooth side surface 26a opposite to the yoke 24. Therefore, the tooth flange portion 27 protrudes on both sides of the circumferential direction of the yoke 24 from the end of the tooth extension portion 26 opposite to the yoke 24.

[0038] Slots 30 are formed in the stator core 23. The slots 30 are formed between adjacent teeth 25 in the circumferential direction of the yoke 24. The slots 30 are spaces defined by the inner peripheral surface 24a of the yoke 24, adjacent tooth side surfaces 26a in the circumferential direction of the yoke 24, and surfaces of the tooth flange portions 27 located on the yoke 24 side. The stator core 23 also has slot openings 31. The slot openings 31 are gaps between adjacent tooth flange portions 27 in the circumferential direction of the yoke 24. The slot openings 31 communicate with the slots 30.

[0039] 3, 4, and 5, the yoke 24 has a plurality of insertion recesses 34. Each insertion recess 34 is formed on the outer circumferential surface of the yoke 24. Each insertion recess 34 opens to the first core end face 23a of the stator core 23. The multiple insertion recesses 34 are disposed at equal intervals in the circumferential direction of the yoke 24 on the outer circumferential surface of the yoke 24. The yoke 24 is provided with, for example, four insertion recesses 34.

[0040] As shown in FIG. 6, the insertion recess 34 is defined by a pair of side surfaces 34a, a connection surface 34b, and a bottom surface 34c. The pair of side surfaces 34a are surfaces that are located on both sides of the yoke 24 in the circumferential direction among the surfaces that define the insertion recess 34. Each side surface 34a is continuous with the outer peripheral surface of the yoke 24. Each side surface 34a is continuous with the first core end surface 23a. The pair of side surfaces 34a extend parallel to each other from the first core end surface 23a in the axial direction of the yoke 24. The connection surface 34b connects the edge portions of the pair of side surfaces 34a that are located on the radial inner side of the yoke 24. The connection surface 34b is continuous with the first core end surface 23a. The bottom surface 34c connects the edge portions of the pair of side surfaces 34a that are located on the opposite side to the first core end surface 23a in the axial direction of the yoke 24. The bottom surface 34c connects the connection surface 34b and the outer peripheral surface of the yoke 24. Each side surface 34a forms an inner surface of the insertion recess 34 located on both sides in the circumferential direction of the yoke 24.

[0041] Each insertion recess 34 is provided with a locking protrusion 35. The locking protrusion 35 protrudes from the connection surface 34b in the radial direction of the yoke 24. The locking protrusion 35 is in the shape of a rectangular prism. In a plan view of the locking protrusion 35, the longitudinal direction of the locking protrusion 35 coincides with the circumferential direction of the yoke 24. The locking protrusion 35 is spaced apart from the bottom surface 34c. The locking protrusion 35 is spaced apart from each side surface 34a.

[0042] <Insulator> As shown in Fig. 3, the stator 22 includes a first insulator 50 serving as an insulator. The first insulator 50 is cylindrical. The stator 22 also includes a second insulator 60 serving as an insulator. The second insulator 60 is cylindrical. The first insulator 50 and the second insulator 60 are made of, for example, a resin material.

[0043] The first insulator 50 and the second insulator 60 each have an insulator base 51 and a plurality of insulator teeth 52. The insulator base 51 is cylindrical. The first insulator 50 and the second insulator 60 are disposed relative to the stator core 23 with the axis of each insulator base 51 coinciding with the axis of the yoke 24. The axial direction of each insulator base 51 is also the axial direction of the yoke 24. The circumferential direction of each insulator base 51 is also the circumferential direction of the yoke 24. Furthermore, the radial direction of each insulator base 51 is also the radial direction of the yoke 24.

[0044] The first insulator 50 is disposed opposite the first core end face 23a of the stator core 23 while in contact with the first core end face 23a. The second insulator 60 is disposed opposite the second core end face 23b of the stator core 23 while in contact with the second core end face 23b. The outer diameter of the insulator base 51 is smaller than the outer diameter of the yoke 24. The inner diameter of the insulator base 51 is the same as the inner diameter of the yoke 24.

[0045] Each insulator tooth portion 52 extends from an inner peripheral surface 51a of each insulator base 51 toward the radial inside of the insulator base 51. The multiple insulator teeth portions 52 are arranged at intervals in the circumferential direction of the insulator base 51. The multiple insulator teeth portions 52 are arranged at equal intervals in the circumferential direction of the insulator base 51. Each insulator tooth portion 52 extends from the inner peripheral surface 51a of the insulator base 51 toward the axis of the insulator base 51. In this embodiment, the first insulator 50 and the second insulator 60 each have 15 insulator teeth portions 52. The number of insulator teeth portions 52 is the same as the number of teeth 25 of the stator core 23.

[0046] Each insulator tooth portion 52 has an insulator extension portion 53. Therefore, the first insulator 50 and the second insulator 60 have a plurality of insulator extension portions 53. Each insulator extension portion 53 is columnar and extends from the inner peripheral surface 51a of the insulator base portion 51 radially inward of the insulator base portion 51. The circumferential width of the insulator base portion 51 at each insulator extension portion 53 is the same as the circumferential width of the yoke 24 at each tooth extension portion 26. Each insulator extension portion 53 is in contact with each tooth 25. Therefore, each insulator extension portion 53 is disposed at a position overlapping with each tooth extension portion 26 in the axial direction of the yoke 24.

[0047] Each insulator tooth portion 52 has an insulator inner wall 54. Thus, the first insulator 50 and the second insulator 60 have an insulator inner wall 54. Each insulator inner wall 54 protrudes along the insulator base 51 from an end of each insulator extension portion 53 opposite the insulator base 51. Each insulator inner wall 54 protrudes from each insulator extension portion 53 to both circumferential sides of the insulator base 51 and to the opposite side of the insulator base 51 from the stator core 23 in the axial direction. In this manner, each insulator inner wall 54 protrudes from each insulator extension portion 53. Each insulator inner wall 54 is disposed at a position overlapping the tooth flange portion 27 in the axial direction of the yoke 24.

[0048] The surface 52a of each insulator tooth portion 52 located opposite to the insulator base portion 51 is located on the same plane as the surface 25a of each tooth 25 located opposite to the yoke 24. The surface of each insulator inner wall 54 located opposite to the insulator base portion 51 forms the surface 52a of each insulator tooth portion 52 located opposite to the insulator base portion 51. The surface of each tooth flange portion 27 located opposite to the yoke 24 forms the surface 25a of each tooth 25 located opposite to the yoke 24. The thickness of each insulator inner wall 54 is thicker than the thickness of each tooth flange portion 27. Therefore, each insulator inner wall 54 closes the portion of the surface of each tooth flange portion 27 located on the yoke 24 side in the slot 30 from the axial direction of the yoke 24.

[0049] Each insulator inner wall 54 has an insertion groove 54a. One insertion groove 54a is formed on each surface of each insulator inner wall 54 located on both sides in the circumferential direction of the insulator base 51. Each insertion groove 54a penetrates each insulator inner wall 54 in the axial direction of the insulator base 51. The space inside each insertion groove 54a is part of the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24.

[0050] The first insulator 50 has three guide grooves 55. The three guide grooves 55 are arranged side by side in the axial direction of the first insulator 50. The three guide grooves 55 are formed on the outer circumferential surface of the insulator base 51. The three guide grooves 55 extend in the circumferential direction of the first insulator 50. The first insulator 50 has five through grooves 56 corresponding to each guide groove 55. Each through groove 56 penetrates the insulator base 51 in the radial direction.

[0051] The second insulator 60 has a plurality of insertion recesses 61. Each insertion recess 61 is formed on a surface 52a of each insulator tooth 52 located on the opposite side to the insulator base 51. Each insertion recess 61 penetrates the surface 52a of each insulator tooth 52 in the axial direction of the insulator base 51.

[0052] As shown in FIG. 7, the insertion recess 61 is defined by a pair of side surfaces 61a, a first connection surface 61b, a second connection surface 61c, and a step surface 61d. The pair of side surfaces 61a are inner surfaces located on both sides of the yoke 24 in the circumferential direction of the insertion recess 61. The side surfaces 61a extend parallel to each other in the axial direction of the yoke 24. The first connection surface 61b, the second connection surface 61c, and the step surface 61d connect the pair of side surfaces 61a to each other. The first connection surface 61b and the second connection surface 61c extend in the axial direction of the yoke 24. The second connection surface 61c is located radially outward of the yoke 24 than the first connection surface 61b. The second connection surface 61c is located closer to the stator core 23 than the first connection surface 61b. The step surface 61d connects the first connection surface 61b and the second connection surface 61c. The step surface 61d extends in the radial direction of the yoke 24.

[0053] <Coil> As shown in Fig. 2, the stator 22 includes coils 28. The stator 22 includes coils 28 corresponding to the U-phase, V-phase, and W-phase. Thus, the stator 22 includes coils 28 for multiple phases. Each coil 28 is formed by winding a winding 29 around the stator core 23 in a concentrated winding manner. A portion of each coil 28 for each phase passes through each slot 30.

[0054] As shown in Figs. 4, 5, 8 and 9, the stator 22 includes a first coil end 32 and a second coil end 33. As shown in Figs. 4 and 5, the first coil end 32 is a part of each of the coils 28 of each phase and protrudes from the first core end face 23a. As shown in Figs. 8 and 9, the second coil end 33 is a part of each of the coils 28 of each phase and protrudes from the second core end face 23b. Therefore, the first coil end 32 and the second coil end 33 are coil ends that are a part of the coils 28 of each phase and protrude from the core end face. In this way, the coil 28 is formed by winding the winding 29 around the stator core 23, and includes coil ends that protrude from the core end face, which is the end face of the stator core 23 located in the axial direction of the yoke 24.

[0055] As shown in FIG. 4, FIG. 5, FIG. 8, and FIG. 9, the coils 28 of each phase are formed by serial winding. In serial winding, first, the windings 29 of each phase passing through each slot 30 are started to be wound around each tooth extension 26, the insulator extension 53 of the first insulator 50, and the insulator extension 53 of the second insulator 60. Then, the windings 29 of each phase are sequentially wound around the tooth extensions 26, the insulator extensions 53 of the first insulator 50, and the insulator extensions 53 of the second insulator 60, which are arranged every third one in the circumferential direction of the stator core 23, by concentrated winding. Therefore, the coils 28 of each phase are arranged every third one in the circumferential direction of the stator core 23. In this embodiment, five coils 28 of each phase are arranged. The coils 28 of each phase are arranged in each slot 30 such that the coils of different phases are adjacent to each other in the circumferential direction of the stator core 23. In this manner, the coil 28 is formed by winding the winding 29 passing through the slot 30 around each tooth extension 26, the insulator extension 53 of the first insulator 50, and the insulator extension 53 of the second insulator 60.

[0056] 4 and 5, the first insulator 50 provides insulation between the coils 28 of each phase and the first core end face 23a. The insulator base 51 of the first insulator 50 is disposed at a position overlapping the first coil end 32 on the radially outer side of the yoke 24. Each insulator inner wall 54 of the first insulator 50 is disposed at a position overlapping the first coil end 32 on the radially inner side of the yoke 24. Therefore, each insulator inner wall 54 of the first insulator 50 is disposed at a position overlapping the tooth flange portion 27 in the axial direction of the yoke 24, and at a position overlapping the first coil end 32 on the radially inner side of the yoke 24.

[0057] 8 and 9, the second insulator 60 provides insulation between the coils 28 of each phase and the second core end face 23b. The insulator base 51 of the second insulator 60 is disposed at a position overlapping the second coil end 33 on the radially outer side of the yoke 24. Each insulator inner wall 54 of the second insulator 60 is disposed at a position overlapping the second coil end 33 on the radially inner side of the yoke 24. Therefore, each insulator inner wall 54 of the second insulator 60 is disposed at a position overlapping the tooth flange portion 27 in the axial direction of the yoke 24, and at a position overlapping the second coil end 33 on the radially inner side of the yoke 24.

[0058] 4, the windings 29 of each phase include crossover wires 57 that connect the coils 28 of each phase together in the circumferential direction of the stator core 23. The crossover wires 57 of each phase are drawn out from the first coil ends 32 of the coils 28 of each phase and guided into the guide grooves 55 corresponding to each phase via the through grooves 56 corresponding to each phase.

[0059] <Slot insulation part> As shown in FIG. 2, the stator 22 includes slot insulating parts 36. The slot insulating parts 36 are arranged in each slot 30. The slot insulating parts 36 are sheet-shaped. The slot insulating parts 36 are formed by bending a strip-shaped insulating sheet so as to extend along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a adjacent to each other in the circumferential direction of the yoke 24. The slot insulating parts 36 are inserted into the slots 30 with the longitudinal direction of the slot insulating parts 36 coinciding with the axial direction of the yoke 24. The slot insulating parts 36 extend from the first core end face 23a to the second core end face 23b of the stator core 23, and further protrude in the axial direction from both end faces of the first core end face 23a and the second core end face 23b. The slot insulating parts 36 insulate the stator core 23 from a part of the coil 28 passing through each slot 30.

[0060] 10, the slot insulating portion 36 has an insulating main body portion 37. The insulating main body portion 37 is a portion of the slot insulating portion 36 that extends along the inner circumferential surface 24a of the yoke 24 and adjacent tooth side surfaces 26a in the circumferential direction of the yoke 24. Therefore, the slot insulating portion 36 extends along the inner circumferential surface 24a of the yoke 24 and adjacent tooth side surfaces 26a in the circumferential direction of the yoke 24.

[0061] As shown in Fig. 11, the slot insulating portion 36 has a pair of protruding portions 38. The protruding portions 38 protrude in a direction approaching each other from both ends of the insulating body portion 37 located on the opposite side to the inner circumferential surface 24a of the yoke 24. Therefore, the pair of protruding portions 38 protrude in a direction approaching each other from adjacent tooth side surfaces 26a in the circumferential direction of the yoke 24. The pair of protruding portions 38 insulate between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31. The protruding portions 38 are spaced apart from the tooth flange portions 27.

[0062] <Insulating materials> As shown in Fig. 2, the stator 22 includes an insulating member 46. One insulating member 46 is disposed in each slot 30. The insulating member 46 is sheet-shaped. The insulating member 46 is formed by folding a strip-shaped insulating sheet. The insulating member 46 is inserted into the slot 30 with the longitudinal direction of the insulating member 46 coinciding with the axial direction of the yoke 24.

[0063] 10 and 11, the insulating member 46 has a first insulating portion 47, a second insulating portion 48, and a third insulating portion 49. The first insulating portion 47 is disposed between one of the teeth flange portions 27 and one of the pair of protruding portions 38 located on both sides of the slot opening 31. The first insulating portion 47 and one of the pair of protruding portions 38 overlap in the radial direction of the yoke 24. The first insulating portion 47 insulates between one of the teeth flange portions 27 located on both sides of the slot opening 31 and one of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30.

[0064] The second insulating portion 48 is disposed between the other of the tooth flange portions 27 located on both sides of the slot opening 31 and the other of the pair of protruding portions 38. The second insulating portion 48 and the other of the pair of protruding portions 38 overlap in the radial direction of the yoke 24. Thus, each protruding portion 38 and the insulating member 46 overlap in the radial direction of the yoke 24. The second insulating portion 48 provides insulation between the other of the tooth flange portions 27 located on both sides of the slot opening 31 and the other of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30.

[0065] The third insulating portion 49 has a V-shaped cross section that extends from an end of the first insulating portion 47 close to the second insulating portion 48 toward the inner circumferential surface 24a of the yoke 24, then bends and extends toward the second insulating portion 48 and is connected to an end of the second insulating portion 48 close to the first insulating portion 47. Therefore, the third insulating portion 49 connects the first insulating portion 47 and the second insulating portion 48. The third insulating portion 49 is disposed between the coils 28 adjacent to each other in the circumferential direction of the yoke 24 in the slot 30. The third insulating portion 49 insulates the coils 28 adjacent to each other in the circumferential direction of the yoke 24 in the slot 30. Therefore, the third insulating portion 49 has a V-shaped cross section that connects the first insulating portion 47 and the second insulating portion 48 and insulates the coils 28 adjacent to each other in the circumferential direction of the yoke 24 in the slot 30.

[0066] In this manner, the insulating member 46 is disposed across the slot opening 31 in the circumferential direction of the yoke 24. The insulating member 46 insulates between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31.

[0067] 4 and 8, both longitudinal ends of the insulating member 46 protrude from the slot 30. Then, as shown in Fig. 10, the portions of the first insulating portion 47 and the second insulating portion 48 of the insulating member 46 that protrude from the slot 30 are inserted into the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24.

[0068] 10 and 11, the first insulating portion 47 is inserted into one of the insertion grooves 54a that form part of the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The second insulating portion 48 is inserted into the other of the insertion grooves 54a that form part of the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. In this manner, the insulating member 46 protrudes from the slot 30 into the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24.

[0069] <First cover member> As shown in Fig. 5, the stator 22 includes a first cover member 65 serving as a cover member. The first cover member 65 is cylindrical. The first cover member 65 has insulating properties. The first cover member 65 is made of, for example, a resin material. The first cover member 65 is disposed opposite the first insulator 50.

[0070] The first cover member 65 has an end wall 65a, an outer peripheral wall 65b, and an inner peripheral wall 65c. The end wall 65a is annular. The end wall 65a is flat. The outer peripheral wall 65b extends cylindrically from the outer peripheral portion of the end wall 65a. The inner peripheral wall 65c extends cylindrically from the inner peripheral portion of the end wall 65a. The inner diameter of the outer peripheral wall 65b is larger than the outer diameter of the insulator base 51. The outer peripheral wall 65b surrounds the insulator base 51 of the first insulator 50. The inner peripheral wall 65c faces each insulator inner wall 54 of the first insulator 50 in the axial direction of the yoke 24. The end wall 65a faces the first coil end 32 in the axial direction of the yoke 24. A plurality of through holes 65h are formed in the end wall 65a.

[0071] 1, the outer peripheral wall 65b of the first cover member 65 is interposed between the crossover wires 57 of each phase and the peripheral wall 13b of the motor housing 13. The outer peripheral wall 65b of the first cover member 65 ensures insulation between the crossover wires 57 of each phase and the motor housing 13.

[0072] 5, the first cover member 65 has a plurality of plate-shaped locking pieces 66. Each locking piece 66 extends in the axial direction of the yoke 24 from an end edge 65e of the outer peripheral wall 65b of the first cover member 65 opposite the end wall 65a. The multiple locking pieces 66 are disposed at equal intervals in the circumferential direction of the outer peripheral wall 65b of the first cover member 65. The first cover member 65 is provided with, for example, four locking pieces 66.

[0073] As shown in FIG. 12, each of the locking pieces 66 is composed of a pair of locking claws 67. Each of the locking claws 67 has an extension piece 67a and a hook piece 67b. Each of the extension pieces 67a is in the shape of an elongated flat plate. Each of the extension pieces 67a extends from an edge 65e of the outer peripheral wall 65b of the first cover member 65 in the axial direction of the yoke 24. The longitudinal direction of each of the extension pieces 67a coincides with the axial direction of the yoke 24. Each of the extension pieces 67a extends parallel to each other. The hook pieces 67b of each of the locking claws 67 extend in a direction approaching each other from the end of the extension piece 67a of each of the locking claws 67 opposite the edge 65e of the outer peripheral wall 65b. The tips of each of the hook pieces 67b face each other in the circumferential direction of the yoke 24. The tips of each of the hook pieces 67b are spaced apart from each other. The side edges of the extension pieces 67a of the locking claws 67 located on the outer sides in the circumferential direction of the yoke 24 form side edges 66a of the locking piece 66 located on both sides in the circumferential direction of the yoke 24.

[0074] As shown in FIG. 13, the locking piece 66 is inserted into the insertion recess 34. The locking piece 66 is inserted into the insertion recess 34 so that the locking protrusion 35 is located between the pair of locking claws 67. As a result, the pair of locking claws 67 are locked to the locking protrusions 35. In this manner, the first cover member 65 is attached to the stator core 23. The hook pieces 67b of the locking claws 67 are locked to the locking protrusions 35, so that the locking pieces 66 do not come off the insertion recess 34. In this manner, the locking protrusions 35 and the hook pieces 67b of the locking claws 67 are locked to each other, so that the axial movement of the yoke 24 relative to the first insulator 50 in the first cover member 65 is restricted. Therefore, the hook pieces 67b of the locking claws 67 are locked portions to which the locking protrusions 35 are locked. Therefore, the locking piece 66 is provided with a locked portion to which the locking protrusions 35 are locked.

[0075] As shown in FIG. 5 and FIG. 14, the first cover member 65 has a plurality of insertion plate portions 68. Each insertion plate portion 68 extends in the axial direction of the yoke 24 from the edge of the inner peripheral wall 65c of the first cover member 65 opposite the end wall 65a. The plurality of insertion plate portions 68 are disposed at equal intervals in the circumferential direction of the inner peripheral wall 65c. Each insertion plate portion 68 is in the shape of an elongated plate. The longitudinal direction of each insertion plate portion 68 coincides with the longitudinal direction of the yoke 24. The side edges of each insertion plate portion 68 located on both sides in the circumferential direction of the yoke 24 extend parallel to each other in the axial direction of the yoke 24. Each insertion plate portion 68 is inserted into a space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. Therefore, the insulator inner wall 54 of the first insulator 50 has a pair of space forming walls 59 that are disposed at positions spaced apart from each other in the circumferential direction of the yoke 24 and define an insertion space 58 into which the insertion plate portion 68 is inserted. Therefore, the insertion space 58 is a space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. The pair of space forming walls 59 are side walls of the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. The insertion plate portion 68 is not inserted between the teeth 25 that are adjacent to each other in the circumferential direction of the yoke 24, and is spaced apart from the stator core 23 in the axial direction of the yoke 24.

[0076] 15, the insertion plate portion 68 can come into contact with the pair of space forming walls 59 when inserted into the insertion space 58. When the insertion plate portion 68 is in contact with one of the pair of space forming walls 59, a clearance is formed between side edges 66a of the locking piece 66 located on both sides in the circumferential direction of the yoke 24 and a pair of side surfaces 34a, which are inner surfaces of the insertion recess 34 located on both sides in the circumferential direction of the yoke 24. When the insertion plate portion 68 comes into contact with one of the pair of space forming walls 59, circumferential movement of the yoke 24 in the first cover member 65 relative to the first insulator 50 is restricted.

[0077] <Second cover member> As shown in FIG. 9, the stator 22 includes a second cover member 70 serving as a cover member. The second cover member 70 is substantially cylindrical. The second cover member 70 has insulating properties. The second cover member 70 is made of, for example, a resin material. The second cover member 70 is disposed on the opposite side of the second core end surface 23b with respect to the second coil end 33 in the axial direction of the yoke 24. The second cover member 70 is disposed facing the second insulator 60.

[0078] The second cover member 70 has a cylindrical main body 71 and a plate-like extension wall 72. The main body 71 faces each insulator inner wall 54 of the second insulator 60 in the axial direction of the yoke 24. The extension wall 72 extends from a part of the outer circumferential edge of the main body 71 to the radially outward side of the yoke 24. The extension wall 72 is in the form of a thin plate. The extension wall 72 is provided with an insulating storage section 73. The storage section 73 is, for example, in the form of a rectangular tube. The storage section 73 stores a neutral point connection section (not shown) that constitutes a neutral point by electrically connecting ends of lead wires 74 of each phase drawn from the second coil end 33 to each other.

[0079] 9 and 16, the second cover member 70 has a plurality of plate-shaped locking pieces 75. Each locking piece 75 extends in the axial direction of the yoke 24 from the inner peripheral edge of the main body portion 71 of the second cover member 70. The multiple locking pieces 75 are disposed on the main body portion 71 of the second cover member 70 at equal intervals in the circumferential direction of the main body portion 71.

[0080] 17, the locking piece 75 is in the shape of an elongated plate. The longitudinal direction of the locking piece 75 coincides with the axial direction of the main body portion 71. Side edges 75a of the locking piece 75 located on both sides in the circumferential direction of the main body portion 71 extend parallel to each other in the axial direction of the main body portion 71.

[0081] The locking piece 75 is provided with a locking protrusion 76. The locking protrusion 76 protrudes in the radial direction of the yoke 24 from a surface located on the radially outer side of the main body 71 at the tip of the locking piece 75. The surface of the locking protrusion 76 located on the radially outer side of the main body 71 forms a tapered surface 76a. The tapered surface 76a is inclined toward the radially inner side of the main body 71 as it approaches the tip of the locking piece 75.

[0082] As shown in FIG. 18, each locking piece 75 is inserted into the insertion recess 61 of each insulator inner wall 54 of the second insulator 60. Then, the locking protrusion 76 passes over the first connection surface 61b and is disposed on the second connection surface 61c. At this time, since the surface of the locking protrusion 76 located on the radially outer side of the main body 71 is a tapered surface 76a, the locking protrusion 76 can easily pass over the first connection surface 61b. Then, the locking protrusion 76 is locked to the step surface 61d of the insertion recess 61, so that the locking piece 75 does not come out of the insertion recess 61. In this manner, the second cover member 70 is attached to the second insulator 60. Then, the locking protrusion 76 is locked to the step surface 61d of the insertion recess 61, so that the axial movement of the yoke 24 of the second cover member 70 relative to the second insulator 60 is restricted. Therefore, the step surface 61d of the insertion recess 61 is a locked portion with which the locking protrusion 76 is locked.

[0083] In this manner, the second cover member 70 has the locking pieces 75, and the insulator inner wall 54 of the second insulator 60 has the insertion recesses 61. The second cover member 70 is attached to the second insulator 60 with the circumferential direction of the main body portion 71 coinciding with the circumferential direction of the yoke 24 and the axial direction of the main body portion 71 coinciding with the axial direction of the yoke 24.

[0084] As shown in FIG. 16, the second cover member 70 has a plurality of insertion plate portions 77. Each insertion plate portion 77 extends from the inner peripheral edge of the main body portion 71 of the second cover member 70 in the axial direction of the yoke 24. The plurality of insertion plate portions 77 are disposed at equal intervals in the circumferential direction of the main body portion 71 of the second cover member 70. Each insertion plate portion 77 is in the shape of an elongated plate. The longitudinal direction of each insertion plate portion 77 coincides with the axial direction of the yoke 24. The side edges of each insertion plate portion 77 located on both sides in the circumferential direction of the yoke 24 extend parallel to each other in the axial direction of the yoke 24. Each insertion plate portion 77 is inserted into a space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. Therefore, the insulator inner wall 54 of the second insulator 60 has a pair of space forming walls 63 that are disposed at positions spaced apart from each other in the circumferential direction of the yoke 24 and define an insertion space 62 into which the insertion plate portion 77 is inserted. The insertion space 62 is a space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The pair of space forming walls 63 are side walls of adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The insertion plate portion 77 is not inserted between adjacent teeth 25 in the circumferential direction of the yoke 24, and is spaced apart from the stator core 23 in the axial direction of the yoke 24.

[0085] The second cover member 70 has a plurality of insertion plate portions 78. Each insertion plate portion 78 extends from the inner peripheral edge of the main body portion 71 of the second cover member 70 in the axial direction of the yoke 24. The plurality of insertion plate portions 78 are disposed at equal intervals in the circumferential direction of the main body portion 71 of the second cover member 70. Each insertion plate portion 78 is in the shape of an elongated plate. The longitudinal direction of each insertion plate portion 78 coincides with the axial direction of the yoke 24. The side edges of each insertion plate portion 78 located on both sides in the circumferential direction of the yoke 24 extend parallel to each other in the axial direction of the yoke 24.

[0086] Each of the insertion plate portions 78 is inserted into an insertion recess 61 into which the locking piece 75 is not inserted among the multiple insertion recesses 61. A pair of side walls forming a pair of side surfaces 61a of the insertion recess 61 into which the locking piece 75 is not inserted among the multiple insertion recesses 61 are a pair of space forming walls 81 that are disposed at positions spaced apart from each other in the circumferential direction of the yoke 24 and define an insertion space 80 into which the insertion plate portion 78 is inserted. Therefore, the insulator inner wall 54 of the second insulator 60 has a pair of space forming walls 81 that are disposed at positions spaced apart from each other in the circumferential direction of the yoke 24 and define an insertion space 80 into which the insertion plate portion 78 is inserted. The insertion plate portion 77 is not inserted between the teeth 25 adjacent to each other in the circumferential direction of the yoke 24, and is separated from the stator core 23 in the axial direction of the yoke 24. The width of each of the insertion plate portions 78 in the circumferential direction of the yoke 24 is slightly larger than the width of the locking piece 75 in the circumferential direction of the yoke 24.

[0087] In addition, in the main body portion 71 of the second cover member 70, for example, a locking piece 75, an insertion plate portion 77, an insertion plate portion 78, an insertion plate portion 77, an insertion plate portion 78, an insertion plate portion 77, and a locking piece 75 are repeatedly arranged at intervals in the circumferential direction of the main body portion 71.

[0088] 19, the insertion plate portion 77 can contact the pair of space forming walls 63 when inserted into the insertion space 62. The insertion plate portion 78 can contact the pair of space forming walls 81 of the insertion recess 61 when inserted into the insertion recess 61. When the insertion plate portions 77, 78 are in contact with one of the pair of space forming walls 63, 81, clearances are formed between the side edges 75a of the locking piece 75 located on both sides in the circumferential direction of the yoke 24 and the pair of side surfaces 61a, which are inner surfaces of the insertion recess 61 located on both sides in the circumferential direction of the yoke 24. When the insertion plate portions 77, 78 are in contact with one of the pair of space forming walls 63, 81, the movement of the yoke 24 in the second cover member 70 in the circumferential direction relative to the second insulator 60 is restricted.

[0089] <Support surface> As shown in Figs. 10 and 11, the insertion plate portions 68, 77 are inserted into spaces between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24 and have support surfaces 85 that support the insulating member 46 from the radially inner side of the yoke 24. The support surfaces 85 are surfaces of the insertion plate portions 68, 77 that are positioned radially outward of the yoke 24. As shown in Fig. 11, the support surfaces 85 are positioned radially outward of the yoke 24 relative to the slot openings 31 when viewed from the axial direction of the yoke 24. The support surfaces 85 of the insertion plate portion 68 support portions of the first insulating portion 47 and the second insulating portion 48 of the insulating member 46 that protrude from the slots 30 and are closer to the third insulating portion 49 than the portions inserted into both insertion grooves 54a.

[0090] <Holding part> The insertion plate parts 68, 77 have a holding part 86. The holding part 86 protrudes from the center of the surface of the insertion plate parts 68, 77 located on the radially outer side of the yoke 24 toward the radially outer side of the yoke 24. The holding part 86 is integrally formed with the insertion plate parts 68, 77. The holding part 86 is disposed between the first insulating part 47 and the second insulating part 48 of the insulating member 46 in the circumferential direction of the yoke 24. The holding part 86 contacts each of the end part of the third insulating part 49 on the first insulating part 47 side and the end part of the third insulating part 49 on the second insulating part 48 side. The holding part 86 holds the opening amount of the third insulating part 49 so as to maintain the separation distance in the circumferential direction of the yoke 24 between the first connecting part 46a, which is the connecting part between the first insulating part 47 and the third insulating part 49, and the second connecting part 46b, which is the connecting part between the second insulating part 48 and the third insulating part 49.

[0091] <Airtight terminal> As shown in FIG. 1, the electric compressor 10 includes a hermetic terminal 40. The hermetic terminal 40 includes three conductive members 41 corresponding to the coils 28 of each phase. Therefore, the electric compressor 10 includes the conductive member 41. Note that FIG. 1 illustrates only one conductive member 41. Each conductive member 41 is a cylindrical metal terminal extending linearly. A first end of each conductive member 41 is electrically connected to the inverter 17 in the inverter chamber S1. A second end of each conductive member 41 protrudes from the inverter chamber S1 into the motor housing 13 through a hole 13h. The hermetic terminal 40 also includes a support plate 42. The support plate 42 supports the three conductive members 41 in a mutually insulated state. The support plate 42 is fixed around the hole 13h on the outer surface of the end wall 13a of the motor housing 13 in the inverter chamber S1.

[0092] The stator 22 includes a lead wire 43. The lead wire 43 is drawn out from the rotating electric machine 20. The lead wire 43 is drawn out from each second coil end 33 of the coils 28 of each phase. Thus, three lead wires 43 are drawn out from the rotating electric machine 20. Note that only one lead wire 43 is shown in FIG. 1.

[0093] The stator 22 includes a cluster block 44. The cluster block 44 accommodates therein three connection terminals 45 corresponding to the coils 28 of each phase. The cluster block 44 has insulating properties. The cluster block 44 is made of, for example, a resin material. Each connection terminal 45 electrically connects each conductive member 41 to each lead wire 43.

[0094] Electric power from the inverter 17 is supplied to the rotating electric machine 20 via the conductive members 41, the connection terminals 45, and the lead wires 43. This drives the rotating electric machine 20. Therefore, the inverter 17 drives the rotating electric machine 20.

[0095] 9, the extending wall 72 of the second cover member 70 holds the three lead wires 43 in a state where they are pressed against the second coil ends 33. This allows the cluster block 44 to be positioned relative to the stator core 23.

[0096] [Operation of the embodiment] Next, the operation of this embodiment will be described. For example, when the rotating electric machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate portion 68 inserted in the insertion space 58 and one of the pair of space forming walls 59. Then, friction in the axial direction of the yoke 24 between the locking piece 66 and the insertion recess 34 is suppressed by the amount of friction occurring in the axial direction of the yoke 24 between the insertion plate portion 68 and one of the pair of space forming walls 59. In particular, when the insertion plate portion 68 is in contact with one of the pair of space forming walls 59, clearances are formed between the side edges 66a of the locking piece 66 located on both sides in the circumferential direction of the yoke 24 and the pair of side surfaces 34a, which are inner surfaces located on both sides in the circumferential direction of the yoke 24 in the insertion recess 34. This prevents friction from occurring between the side edges 66a of the locking piece 66 located on both sides in the circumferential direction of the yoke 24 and the pair of side surfaces 34a located on both sides in the circumferential direction of the yoke 24 in the insertion recess 34. Therefore, the progression of friction between the locking piece 66 and the insertion recess 34 is suppressed. This avoids a problem in that the locking protrusion 35 and the hook piece 67b of the locking claw 67 are disengaged due to the breaking of the locking piece 66. This avoids a problem in that the first cover member 65 falls off the first insulator 50 in the axial direction of the yoke 24.

[0097] Similarly, when the rotating electric machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate parts 77, 78 inserted into the insertion spaces 62, 80 and one of the pair of space forming walls 63, 81. Then, friction in the axial direction of the yoke 24 between the locking piece 75 and the insertion recess 61 is suppressed by the amount of friction occurring in the axial direction of the yoke 24 between the insertion plate parts 77, 78 and one of the pair of space forming walls 63, 81. In particular, when the insertion plate parts 77, 78 are in contact with one of the pair of space forming walls 63, 81, clearances are formed between the side edges 75a located on both sides of the circumferential direction of the yoke 24 of the locking piece 75 and a pair of side surfaces 61a, which are inner surfaces located on both sides of the circumferential direction of the yoke 24 in the insertion recess 61. This prevents friction from occurring between the side edges 75a located on both sides of the circumferential direction of the yoke 24 of the locking piece 75 and a pair of side surfaces 61a located on both sides of the circumferential direction of the yoke 24 in the insertion recess 61. This suppresses the progression of friction between the locking pieces 75 and the insertion recessed portion 61. This avoids a problem in which the locking protrusions 76 and the step surface 61d are disengaged due to the breakage of the locking pieces 75. This avoids a problem in which the second cover member 70 falls off the second insulator 60 in the axial direction of the yoke 24.

[0098] The insertion plate portions 68, 77 are inserted into the spaces between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24, so that the support surfaces 85 of the insertion plate portions 68, 77 support the insulating member 46 from the radially inner side of the yoke 24. At this time, since the support surfaces 85 are located radially outward of the yoke 24 relative to the slot openings 31 when viewed from the axial direction of the yoke 24, the insulating member 46 is restricted from approaching any closer to the slot openings 31. This makes it easier to ensure an insulation distance between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31.

[0099] [Effects of the embodiment] The above-described embodiment can provide the following advantages. In the following description of the advantages of the embodiments (5) to (7), the advantages related to the second cover member 70 will be described in detail. The advantages related to the first cover member 65 are similar to those related to the second cover member 70, and therefore detailed description thereof will be omitted.

[0100] (1) The insertion plate parts 68, 77 are inserted into the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24, so that the support surfaces 85 of the insertion plate parts 68, 77 support the insulating member 46 from the radially inner side of the yoke 24. At this time, the support surfaces 85 are located radially outward of the yoke 24 relative to the slot openings 31 when viewed from the axial direction of the yoke 24, so that the insulating member 46 is restricted from approaching the slot openings 31 any further. This makes it easier to ensure the insulation distance between the coil 28 and each of the tooth flange parts 27 located on both sides of the slot opening 31. As a result, insulation failure between the coil 28 and each of the tooth flange parts 27 located on both sides of the slot opening 31 can be suppressed, so that the reliability of the stator 22 of the rotating electric machine 20 can be improved.

[0101] (2) The protruding portions 38 of the slot insulating portion 36 overlap with the insulating member 46 in the radial direction of the yoke 24. Therefore, compared to a case where the protruding portions 38 are not present, it is possible to easily increase the insulation distance between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31. As a result, it is possible to more easily prevent insulation failure between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31, and therefore the reliability of the stator 22 of the rotating electric machine 20 can be further improved.

[0102] (3) The insertion plate portions 68, 77 have a retaining portion 86 that retains the opening amount of the third insulating portion 49 to maintain the circumferential distance of the yoke 24 between the first connecting portion 46a, which is the connecting portion between the first insulating portion 47 and the third insulating portion 49, and the second connecting portion 46b, which is the connecting portion between the second insulating portion 48 and the third insulating portion 49. This makes it possible to maximize the distance from the slot opening 31 to the edge of the first insulating portion 47 opposite the connecting portion with the third insulating portion 49, and the distance from the slot opening 31 to the edge of the second insulating portion 48 opposite the connecting portion with the third insulating portion 49. This makes it possible to easily increase the insulation distance between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31. As a result, it is possible to more easily prevent poor insulation between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31, thereby further improving the reliability of the stator 22 of the rotating electric machine 20.

[0103] (4) The insertion plate parts 68, 77 are not inserted between the teeth 25 adjacent to each other in the circumferential direction of the yoke 24, and are separated from the stator core 23 in the axial direction of the yoke 24. As a result, the support surface 85 of the insertion plate parts 68, 77 supports only the part protruding from the slot 30 in the insulating member 46 into the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24 from the radial inside of the yoke 24. Therefore, since the insertion plate parts 68, 77 are separated from the stator core 23, for example, when the rotating electric machine 20 vibrates, it is possible to avoid a problem that friction occurs between the insertion plate parts 68, 77 and the stator core 23 due to the contact of the insertion plate parts 68, 77 with the stator core 23. Therefore, it is possible to improve the durability of the stator 22 of the rotating electric machine 20, and as a result, it is possible to further improve the reliability of the stator 22 of the rotating electric machine 20.

[0104] (5) The second cover member 70 has insertion plate portions 77, 78 extending in the axial direction of the yoke 24. The insulator inner wall 54 has a pair of space forming walls 63, 81 that are disposed at positions spaced apart from each other in the circumferential direction of the yoke 24 and define the insertion spaces 62, 80 into which the insertion plate portions 77, 78 are inserted. The insertion plate portions 77, 78 can contact the pair of space forming walls 63, 81 when inserted into the insertion spaces 62, 80. For example, when the rotating electric machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate portions 77, 78 inserted into the insertion spaces 62, 80 and one of the pair of space forming walls 63, 81. Then, friction in the axial direction of the yoke 24 between the locking pieces 75 and the insertion recesses 61 is suppressed by the amount of friction in the axial direction of the yoke 24 between the insertion plate portions 77, 78 and one of the pair of space forming walls 63, 81. This makes it possible to suppress the progression of friction between the locking pieces 75 and the insertion recessed portion 61. This makes it possible to avoid a problem in which the locking protrusions 76 and the step surface 61d are disengaged due to the locking pieces 75 breaking. This makes it possible to avoid a problem in which the second cover member 70 falls off the second insulator 60 in the axial direction of the yoke 24. As a result, it is possible to improve the reliability of the stator 22 of the rotating electric machine 20.

[0105] (6) When the insertion plate portions 77, 78 are in contact with one of the pair of space forming walls 63, 81, clearances are formed between the side edges 75a of the locking pieces 75 located on both sides in the circumferential direction of the yoke 24 and a pair of side surfaces 61a which are inner surfaces of the insertion recess 61 located on both sides in the circumferential direction of the yoke 24. This makes it possible to avoid friction being generated between the side edges 75a of the locking pieces 75 located on both sides in the circumferential direction of the yoke 24 and the pair of side surfaces 61a which are inner surfaces of the insertion recess 61 located on both sides in the circumferential direction of the yoke 24.

[0106] (7) The insertion space 62 is a space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The pair of space forming walls 63 are side walls of adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. With this, friction between the locking pieces 75 and the insertion recesses 61 can be suppressed simply by inserting the insertion plate portions 77 into the spaces between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. This allows the configuration of the stator 22 to be simplified.

[0107] (8) The second cover member 70 has the locking piece 75, and the insulator inner wall 54 of the second insulator 60 has the insertion recess 61. With this, the insertion plate portion 77, the pair of space forming walls 63, the locking piece 75, and the insertion recess 61 are disposed radially inward of the yoke 24 relative to the second coil end 33. Therefore, compared to a case where the locking piece 75 and the insertion recess 61 are disposed radially outward of the yoke 24 relative to the second coil end 33, for example, the locking piece 75 and the insertion recess 61 can be disposed as close as possible to the insertion plate portion 77 and the pair of space forming walls 63. As a result, the dimensional tolerances of the parts are less likely to accumulate between the locking piece 75 and the insertion recess 61 and the insertion plate portion 77 and the pair of space forming walls 63. Therefore, friction between the locking piece 75 and the insertion recess 61 due to friction between the insertion plate portion 77 and the space forming walls 63 can be suitably suppressed.

[0108] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0109] As shown in FIG. 20, for example, the insertion plate portion 77 may pass through a space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24 and be inserted between adjacent teeth 25 in the circumferential direction of the yoke 24. In this case, the support surface 85 of the insertion plate portion 77 supports not only a portion of the insulating member 46 protruding from the slot 30 into the space between adjacent insulator inner walls 54 in the circumferential direction of the yoke 24, but also a portion of the insulating member 46 located within the slot 30 from the radial inside of the yoke 24. Therefore, the support surface 85 of the insertion plate portion 77 can stably support the insulating member 46 from the radial inside of the yoke 24. This makes it easier to prevent the insulating member 46 from approaching the slot opening 31 any further. This makes it easier to ensure the insulation distance between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31. As a result, it is possible to more easily prevent poor insulation between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31, thereby further improving the reliability of the stator 22 of the rotating electric machine 20.

[0110] In the above embodiment, the second cover member 70 does not have to include the insertion plate portion 78. In the embodiment, for example, the insulator inner wall 54 of the second insulator 60 may have an locking piece, and the second cover member 70 may have an insertion recess into which the locking piece is inserted. In short, it is sufficient that one of the cover member and the insulator inner wall 54 has the locking piece, and the other of the cover member and the insulator inner wall 54 has the insertion recess into which the locking piece is inserted.

[0111] In the embodiment, the insulator inner wall 54 of the second insulator 60 does not have to have the insertion recess 61. For example, the insulator base 51 of the second insulator 60 may have the insertion recess. In this case, the locking piece 75 extends radially outward from the main body 71 and is configured to be insertable into an insertion recess formed in the insulator base 51 of the second insulator 60.

[0112] In the embodiment, for example, the second insulator 60 may have a plate-shaped locking piece, and the second cover member 70 may have an insertion recess into which the locking piece is inserted. In short, it is sufficient that one of the cover member and the insulator has the plate-shaped locking piece, and the other of the cover member and the insulator has the insertion recess into which the locking piece is inserted.

[0113] In the embodiment, for example, the yoke 24 may have a plate-shaped locking piece, and the first cover member 65 may have an insertion recess into which the locking piece is inserted. In short, one of the cover member and the yoke 24 may have a plate-shaped locking piece, and the other of the cover member and the yoke 24 may have an insertion recess into which the locking piece is inserted. In this manner, one of the cover member and the insulator, or one of the cover member and the yoke, may have a plate-shaped locking piece, and the other of the cover member and the insulator, or the other of the cover member and the yoke, may have an insertion recess into which the locking piece is inserted. In this case, a locking protrusion may be provided on one of the locking piece and the insertion recess, and a locked portion to which the locking protrusion is locked may be provided on the other of the locking piece and the insertion recess. The locked portion provided on the other of the locking piece and the insertion recess may be a protrusion protruding from the other of the locking piece and the insertion recess, or a recess recessed from the other of the locking piece and the insertion recess.

[0114] In the above embodiment, the locking pieces 66, 75 and the insertion recesses 34, 61 do not have to be disposed at equal intervals in the circumferential direction. In the above embodiment, the insertion plate portions 68, 77, and 78 do not have to be disposed at equal intervals in the circumferential direction.

[0115] In the above embodiment, the slot insulating portion 36 does not have to have the pair of protruding portions 38 . In the above embodiment, the slot insulating portions 36 may be resin layers that are formed by integrally molding resin onto the inner circumferential surface 24a of the yoke 24 and the side surfaces 26a of the teeth that are adjacent to each other in the circumferential direction of the yoke 24.

[0116] In the embodiment, the insulating member 46 has a V-shape in cross section and includes the first insulating portion 47, the second insulating portion 48, and the third insulating portion 49. However, the present invention is not limited to this. For example, the insulating member 46 may have a flat plate shape that is arranged in the slot 30 and straddles the slot opening 31 in the circumferential direction of the yoke 24. The flat plate-shaped insulating member insulates between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31. In short, it is sufficient for the insulating member 46 to insulate between the coil 28 and each of the tooth flange portions 27 located on both sides of the slot opening 31, and the shape of the insulating member 46 is not particularly limited.

[0117] In the above embodiment, the insulating member 46 is a foldable insulating sheet. However, the present invention is not limited to this. For example, the insulating member 46 may be a molded member. In the above-described embodiment, the insertion plate portions 68 and 77 do not necessarily have to include the holding portions 86 .

[0118] In the above-mentioned embodiment, the compression section 16 is not limited to a scroll type, and may be, for example, a piston type or a vane type. In the above embodiment, the electric compressor 10 is used in a vehicle air conditioner, but the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and may compress air, which serves as a fluid to be supplied to the fuel cell, by the compression unit 16.

[0119] [Note] The above embodiment includes the configurations described in the following supplementary notes. <Appendix 1> a stator core having a cylindrical yoke and a plurality of teeth extending from an inner peripheral surface of the yoke toward a radially inward direction of the yoke, with slots formed between adjacent teeth in a circumferential direction of the yoke; a coil formed by winding a winding around the stator core, the coil including a coil end protruding from a core end surface, which is an end surface of the stator core located in the axial direction of the yoke; an insulator disposed opposite the core end surface and providing insulation between the coil end and the core end surface; a cover member disposed opposite the insulator, Each of the teeth is a teeth extension portion extending from an inner peripheral surface of the yoke; a tooth flange portion protruding in the circumferential direction from each of the tooth side surfaces located on both sides of the tooth extension portion in the circumferential direction of the yoke, The insulator comprises: a cylindrical insulator base portion arranged at a position overlapping the coil end on the radially outer side; a plurality of insulator extension portions extending radially inward from an inner circumferential surface of the insulator base and disposed at positions overlapping with each of the tooth extension portions in the axial direction; an insulator inner wall protruding from each of the insulator extension portions and overlapping with the tooth flange portion in the axial direction and arranged at a position overlapping with the coil end on a radially inner side of the yoke, the coil is formed by winding a wire passing through the slot around the tooth extension and the insulator extension, a slot insulation portion extending along an inner peripheral surface of the yoke and along side surfaces of adjacent teeth in the circumferential direction and providing insulation between the stator core and the coil within the slot; an insulating member disposed across a slot opening, which is a gap between adjacent teeth flanges in the circumferential direction, and providing insulation between the coil and each of the teeth flanges located on both sides of the slot opening, The cover member has an insertion plate portion extending in the axial direction, the insertion plate portion is inserted into a space between adjacent insulator inner walls in the circumferential direction and has a support surface that supports the insulating member from the radially inner side, A stator for a rotating electric machine, wherein the support surface is located radially outward of the slot opening when viewed from the axial direction.

[0120] <Appendix 2> the slot insulating portion has a pair of protruding portions that protrude in a direction approaching each other from each of the tooth side surfaces adjacent to each other in the circumferential direction and provide insulation between the coil and each of the tooth flange portions located on both sides of the slot opening, The stator of a rotating electric machine described in <Appendix 1>, wherein each of the protruding portions and the insulating member overlap in the radial direction.

[0121] <Appendix 3> The insulating member is a first insulating portion that insulates between one of the teeth flange portions located on both sides of the slot opening and one of the coils adjacent to each other in the circumferential direction within the slot; a second insulating portion that insulates between the other of the teeth flange portions located on both sides of the slot opening and the other of the coils adjacent to each other in the circumferential direction within the slot; a third insulating portion having a V-shaped cross section that connects the first insulating portion and the second insulating portion and insulates adjacent coils in the circumferential direction within the slot, The stator of a rotating electric machine described in <Appendix 1> or <Appendix 2>, characterized in that the insertion plate portion has a retaining portion that retains an opening amount of the third insulating portion so as to maintain a circumferential separation distance between a first connection portion that is a connection point between the first insulating portion and the third insulating portion, and a second connection portion that is a connection point between the second insulating portion and the third insulating portion.

[0122] <Appendix 4> The stator of a rotating electric machine described in any one of <Appendix 1> to <Appendix 3>, characterized in that the insertion plate portion is not inserted between adjacent teeth in the circumferential direction and is separated from the stator core in the axial direction of the yoke.

[0123] <Appendix 5> The stator of a rotating electric machine described in any one of <Appendix 1> to <Appendix 3>, characterized in that the insertion plate portion passes through a space between adjacent insulator inner walls in the circumferential direction and is inserted into between adjacent teeth in the circumferential direction. [Explanation of symbols]

[0124] 20... rotating electric machine, 22... stator, 23... stator core, 23a... first core end face which is a core end face, 23b... second core end face which is a core end face, 24... yoke, 24a... inner peripheral surface, 25... teeth, 26... teeth extension portion, 26a... teeth side surface, 27... teeth flange portion, 28... coil, 29... winding, 30... slot, 31... slot open, 32... first coil end which is a coil end, 33... second coil end which is a coil end, 36... slot insulating portion, 38... protruding portion, 46...insulating member, 46a...first connection portion, 46b...second connection portion, 47...first insulating portion, 48...second insulating portion, 49...third insulating portion, 50...first insulator as insulator, 51...insulator base portion, 53...insulator extension portion, 54...insulator inner wall, 60...second insulator as insulator, 65...first cover member as cover member, 68...insertion plate portion, 70...second cover member as cover member, 77...insertion plate portion, 85...support surface, 86...retaining portion.

Claims

1. a stator core having a cylindrical yoke and a plurality of teeth extending from an inner peripheral surface of the yoke toward a radially inward direction of the yoke, with slots formed between adjacent teeth in a circumferential direction of the yoke; a coil formed by winding a winding around the stator core, the coil including a coil end protruding from a core end surface, which is an end surface of the stator core located in the axial direction of the yoke; an insulator disposed opposite the core end surface and providing insulation between the coil end and the core end surface; a cover member disposed opposite the insulator, Each of the teeth is a teeth extension portion extending from an inner peripheral surface of the yoke; a tooth flange portion protruding in the circumferential direction from each of the tooth side surfaces located on both sides of the tooth extension portion in the circumferential direction of the yoke, The insulator comprises: a cylindrical insulator base portion arranged at a position overlapping the coil end on the radially outer side; a plurality of insulator extension portions extending radially inward from an inner circumferential surface of the insulator base and disposed at positions overlapping with each of the tooth extension portions in the axial direction; an insulator inner wall protruding from each of the insulator extension portions and overlapping with the tooth flange portion in the axial direction and arranged at a position overlapping with the coil end on a radially inner side of the yoke, the coil is formed by winding a wire passing through the slot around the tooth extension and the insulator extension, a slot insulation portion extending along an inner peripheral surface of the yoke and along side surfaces of adjacent teeth in the circumferential direction and providing insulation between the stator core and the coil within the slot; an insulating member disposed across a slot opening, which is a gap between adjacent teeth flanges in the circumferential direction, and providing insulation between the coil and each of the teeth flanges located on both sides of the slot opening, The cover member has an insertion plate portion extending in the axial direction, the insertion plate portion is inserted into a space between adjacent insulator inner walls in the circumferential direction and has a support surface that supports the insulating member from the radially inner side, A stator for a rotating electric machine, wherein the support surface is located radially outward of the slot opening when viewed from the axial direction.

2. the slot insulating portion has a pair of protruding portions that protrude in a direction approaching each other from each of the tooth side surfaces adjacent to each other in the circumferential direction and provide insulation between the coil and each of the tooth flange portions located on both sides of the slot opening, 2. The stator of claim 1, wherein each of the protruding portions and the insulating member overlap in the radial direction.

3. The insulating member is a first insulating portion that insulates between one of the teeth flange portions located on both sides of the slot opening and one of the coils adjacent to each other in the circumferential direction within the slot; a second insulating portion that insulates between the other of the teeth flange portions located on both sides of the slot opening and the other of the coils adjacent to each other in the circumferential direction within the slot; a third insulating portion having a V-shaped cross section that connects the first insulating portion and the second insulating portion and insulates adjacent coils in the circumferential direction within the slot, 3. The stator of a rotating electric machine as described in claim 1 or claim 2, characterized in that the insertion plate portion has a retaining portion that retains the amount of opening of the third insulating portion so as to maintain the circumferential separation distance between a first connection portion, which is a connection point between the first insulating portion and the third insulating portion, and a second connection portion, which is a connection point between the second insulating portion and the third insulating portion.

4. 2. The stator of claim 1, wherein the insertion plate portion is not inserted between adjacent teeth in the circumferential direction and is spaced apart from the stator core in the axial direction of the yoke.

5. 2. The stator of claim 1, wherein the insertion plate portion passes through a space between adjacent insulator inner walls in the circumferential direction and is inserted between adjacent teeth in the circumferential direction.

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