Stator for rotating electric machine

Abstract

The invention relates to a stator of a rotary electric machine, and the reliability of the stator of the rotary electric machine is improved. 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) disposed at positions spaced apart from each other in the circumferential direction of the yoke (24) and defining insertion spaces (62, 80) into which the insertion plate parts (77, 78) are inserted. The insertion plate parts (77, 78) can be in contact with the pair of space-forming walls (63, 81) in a state of being inserted into the insertion spaces (62, 80). Friction in the axial direction of the yoke (24) between the locking piece (75) and the insertion recess (61) is suppressed in response to friction in the axial direction of the yoke (24) generated between the insertion plate sections (77, 78) and one of the pair of space-forming walls (63, 81).

Description

Technical Field

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

[0002] For example, as described in Patent Document 1, the 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 circumferential surface of the yoke to the radial inner side of the yoke. Each tooth has a tooth extension portion and a tooth flange portion. The tooth extension portion extends from the inner circumferential surface of the yoke. The tooth flange portion protrudes in the circumferential direction of the yoke from the tooth side surfaces of the tooth extension portion located on both sides of the circumferential direction of the yoke. The coil is formed by winding a winding on the stator core. The coil includes a coil end protruding from the end face of the stator core located in the axial direction of the yoke, that is, the core end face. The insulator is arranged opposite to the core end face of the stator core. The insulator insulates the coil end from the core end face.

[0003] The insulator has a cylindrical insulator base, a plurality of insulator extensions, and an insulator inner wall. The insulator base is arranged at a position overlapping with the coil end on the radial outer side of the yoke. Each insulator extension extends from the inner circumference of the insulator base toward the radial inner side of the insulator base. Each insulator extension is arranged at a position overlapping with each tooth extension in the axial direction of the yoke. The insulator inner wall protrudes from each insulator extension and is arranged at a position overlapping with the tooth flange in the axial direction of the yoke and overlapping with the coil end on the radial inner side of the yoke.

[0004] In such a stator of a rotating electric machine, there is sometimes a cover member arranged opposite to an insulator. One side of the cover member and the insulator has a plate-shaped locking piece extending in the axial direction, and the other side of the cover member and the insulator has an insertion recess for inserting the locking piece. Alternatively, one side of the cover member and the yoke has a plate-shaped locking piece extending in the axial direction, and the other side of the cover member and the yoke has an insertion recess for inserting the locking piece. A locking protrusion protruding radially toward the yoke is provided on one side of the locking piece and the insertion recess. A locked portion to be locked by the locking protrusion is provided on the other side of the locking piece and the insertion recess.

[0005] Furthermore, one side edge of the locking piece located on both sides of the circumferential direction of the yoke contacts one side of the inner surface of the insertion recess located on both sides of the circumferential direction of the stator core. Thus, the movement of the cover member relative to the insulator in the circumferential direction of the yoke is restricted. Furthermore, the locking of the locking protrusion and the locked portion restricts the movement of the cover member relative to the insulator in the axial direction of the yoke.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2022-150980 Summary of the invention

[0009] Problems to be solved by the invention

[0010] In such a stator of a rotating electric machine, for example, if the rotating electric machine vibrates, friction in the axial direction of the yoke may occur between the side edges of the locking plate located on both sides of the circumferential direction of the yoke and the inner surfaces of the insertion recess located on both sides of the circumferential direction of the stator core. If the friction between the locking plate and the insertion recess progresses, the locking plate may break. If the locking plate breaks, the locking of the locking protrusion and the locked portion will be released, so the cover member may fall off in the axial direction of the yoke relative to the insulator. Therefore, the reliability of the stator of the rotating electric machine will decrease.

[0011] Means for solving problems

[0012] The stator of a rotating electric machine for solving the above-mentioned problems comprises: a stator core having a cylindrical yoke and a plurality of teeth extending from the inner circumference of the yoke to the radial inner side of the yoke; a coil formed by winding a winding on the stator core and including a coil end protruding from an end face of the stator core located in the axial direction of the yoke, namely, a core end face; an insulator arranged opposite to the core end face and insulating the coil end from the core end face; and a cover member arranged opposite to the insulator, wherein each tooth comprises: a tooth extension portion extending from the inner circumference of the yoke; and a tooth flange portion , the tooth side surfaces of the tooth extension portion located on both sides of the circumferential direction of the yoke protrude in the circumferential direction respectively, and the insulator has: a cylindrical insulator base portion, which is arranged at a position overlapping with the coil end in the radial direction outer side; a plurality of insulator extension portions, which extend from the inner circumference of the insulator base portion to the radial inner side of the insulator base portion and are arranged at positions overlapping with each of the tooth extension portions in the axial direction; and an insulator inner wall, which protrudes from each of the insulator extension portions and is arranged to overlap with the tooth flange portion in the axial direction and with respect to the coil end. At a position where the ends overlap on the radial inner side of the yoke, one of the cover member and the insulator has a plate-shaped locking piece extending in the axial direction and the other of the cover member and the insulator has an insertion recess for inserting the locking piece, or one of the cover member and the yoke has a plate-shaped locking piece extending in the axial direction and the other of the cover member and the yoke has an insertion recess for inserting the locking piece, and a locking protrusion protruding radially toward the yoke is provided on one of the locking piece and the insertion recess, and a locking protrusion protruding in the radial direction of the yoke is provided on the locking protrusion. The sheet and the other side of the insertion recess are provided with a locked portion for the locking protrusion to be locked, and the movement of the cover member relative to the insulator in the axial direction is restricted by the locking of the locking protrusion and the locked portion, wherein the cover member has an insertion plate portion extending in the axial direction, and the inner wall of the insulator has a pair of space-forming walls arranged at positions separated from each other in the circumferential direction and defining an insertion space for the insertion plate portion to be inserted, and the insertion plate portion can contact the pair of space-forming walls when inserted into the insertion space.

[0013] For example, if the rotating electric machine vibrates, friction in the axial direction of the yoke is generated between the insertion plate portion inserted into the insertion space and one of the pair of space-forming walls. Therefore, corresponding to the friction in the axial direction of the yoke generated between the insertion plate portion and one of the pair of space-forming walls, the friction in the axial direction of the yoke between the locking piece and the insertion recess is suppressed. Therefore, the progress of the friction between the locking piece and the insertion recess can be suppressed. Thus, problems such as the locking of the locking protrusion and the locked portion being released due to the breakage of the locking piece can be avoided. Therefore, problems such as the axial falling of the cover member relative to the insulator toward the yoke can be avoided. As a result, the reliability of the stator of the rotating electric machine can be improved.

[0014] In the above-mentioned stator of the rotating electric machine, it is preferable that, when the insertion plate portion is in contact with one of the pair of space-forming walls, gaps are respectively formed between the side edges of the locking plate located on both sides of the circumferential direction and the inner surfaces of the insertion recess located on both sides of the circumferential direction.

[0015] This can avoid the occurrence of friction between the side edges of the locking piece located on both sides in the circumferential direction of the yoke and the inner surfaces of the insertion recessed portion located on both sides in the circumferential direction of the yoke.

[0016] In the above-mentioned stator of the rotating electrical machine, preferably, the insertion space is a space between inner walls of the insulator adjacent to each other in the circumferential direction, and the pair of space forming walls are side walls of the inner walls of the insulator adjacent to each other in the circumferential direction.

[0017] Thus, friction between the locking piece and the insertion recess can be suppressed simply by inserting the insertion plate into the space between the inner walls of the insulator adjacent to each other in the circumferential direction of the yoke. Therefore, the structure of the stator can be simplified.

[0018] In the above-mentioned stator of the rotating electrical machine, preferably, one of the cover member and the inner wall of the insulator has the locking piece, and the other of the cover member and the inner wall of the insulator has the insertion recess.

[0019] Thus, the insertion plate portion, a pair of space-forming walls, the locking piece and the insertion recess are arranged at the radial inner side of the yoke than the coil end. Therefore, for example, compared with the case where the locking piece and the insertion recess are arranged at the radial outer side of the yoke than the coil end, the locking piece and the insertion recess can be brought as close to the insertion plate portion and the pair of space-forming walls as possible. As a result, the dimensional tolerances of the components between the locking piece and the insertion recess and the insertion plate portion and the pair of space-forming walls are difficult to accumulate. Therefore, the friction between the locking piece and the insertion recess, which is achieved by the friction between the insertion plate portion and the space-forming wall, can be appropriately suppressed.

[0020] In the stator of the rotating electric machine described above, it is preferable that slots are formed in the stator core between teeth adjacent to each other in the circumferential direction of the yoke, and the coil is formed by winding a winding passing through the slots on the tooth extension portion and the insulator extension portion, and the stator comprises: a slot insulating portion extending along the inner circumferential surface of the yoke and the tooth side surfaces adjacent to each other in the circumferential direction, and insulating the stator core and the coil in the slot; and an insulating member arranged in a state of spanning a gap between tooth flange portions adjacent to each other in the circumferential direction, i.e., a slot opening, insulating tooth flange portions located on both sides of the slot opening from each other, and the insertion plate portion is inserted into the space between inner walls of the insulator adjacent to each other in the circumferential direction, and has a supporting surface for supporting the insulating member from the radial inner side, and the supporting surface is located radially outward of the slot opening when viewed from the axial direction.

[0021] Thus, by inserting the insertion plate portion into the space between the inner walls of the insulators adjacent to each other in the circumferential direction of the yoke, the support surface of the insertion plate portion supports the insulating member from the radial inner side of the yoke. At this time, the support surface is located radially outside the yoke relative to the slot opening when viewed from the axial direction of the yoke, thereby limiting the insulating member from approaching the slot opening further. Thus, it is easy to ensure the insulation distance between each of the tooth flange portions located on both sides of the slot opening and the coil. As a result, it is possible to prevent the insulation between each of the tooth flange portions located on both sides of the slot opening and the coil from being poor, thereby improving the reliability of the stator of the rotating electric machine.

[0022] Effects of the Invention

[0023] According to the present invention, the reliability of the stator of the rotating electrical machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view showing the electric compressor in the embodiment.

[0025] Figure 2 is a cross-sectional view of a rotating electrical machine.

[0026] Figure 3 It is an exploded perspective view showing the stator core, the first insulator, and the second insulator.

[0027] Figure 4 It is a perspective view of the stator showing a state before the first cover member is arranged with respect to the first insulator.

[0028] Figure 5 It is a perspective view of the stator showing a state in which the first cover member is arranged with respect to the first insulator.

[0029] Figure 6 This is a perspective view showing an enlarged insertion recess and a locking protrusion of the yoke.

[0030] Figure 7 It is a perspective view showing an enlarged insertion recess of the second insulator.

[0031] Figure 8 It is a perspective view of the stator showing a state before the second cover member is arranged with respect to the second insulator.

[0032] Fig. 9 It is a perspective view of the stator showing a state in which the second cover member is arranged with respect to the second insulator.

[0033] Fig.10 is a cross-sectional view showing a part of the stator.

[0034] Fig.11 is a cross-sectional view showing a part of the stator.

[0035] Fig.12 It is a perspective view showing an enlarged locking piece of the first cover member.

[0036] Fig.13 It is a perspective view showing the relationship between the locking piece and the insertion recess.

[0037] Fig.14 It is a perspective view for explaining the insertion plate portion of the first cover member.

[0038] Fig.15 It is a cross-sectional view for explaining the relationship among the insertion plate portion, the space forming wall, the locking piece, and the insertion recess.

[0039] Fig.16 It is a perspective view for explaining the insertion plate portion and the locking piece of the second cover member.

[0040] Fig.17 It is a perspective view showing an enlarged insertion plate portion and a locking protrusion portion of the second cover member.

[0041] Fig.18 It is a cross-sectional view showing the relationship between the insertion recess and the locking piece.

[0042] Fig.19 It is a cross-sectional view for explaining the relationship among the insertion plate portion, the space forming wall, the locking piece, and the insertion recess.

[0043] Fig. 20 It is a perspective view for explaining the insertion plate portion in the modification example.

[0044] Description of Reference Numerals

[0045] 20…rotating electric machine, 22…stator, 23…stator core, 23a…first core end face as a core end face, 23b…second core end face as a core end face, 24…yoke, 24a…inner peripheral surface, 25…tooth, 26…tooth extension portion, 26a…tooth side surface, 27…tooth flange portion, 28…coil, 29…winding, 30…slot, 31…slot opening, 32…first coil end as a coil end, 33…second coil end as a coil end, 34…insertion recess, 35…locking protrusion, 36…slot insulating portion, 46…insulating member, 50…first insulator as an insulator, 51…insulator base, 53… Insulator extension portion, 54…insulator inner wall, 58…insertion into space, 59…space forming wall, 60…second insulator as an insulator, 61…insertion into recessed portion, 61d…step surface as a locked portion, 62…insertion into space, 63…space forming wall, 65…first cover member as a cover member, 66…locking piece, 66a…side edge, 67b…hook piece as a locked portion, 68…insertion plate portion, 70…second cover member as a cover member, 75…locking piece, 76…locking protrusion, 77…insertion plate portion, 78…insertion plate portion, 80…insertion into space, 81…space forming wall, 85…support surface. DETAILED DESCRIPTION

[0046] Below, according to Figures 1 to 19 An embodiment in which a stator of a rotating electric machine is embodied will be described. The stator of a 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.

[0047] <Basic structure of electric compressor>

[0048] like Figure 1 As shown, the electric compressor 10 includes a cylindrical housing 11. The housing 11 includes a discharge housing 12, a motor housing 13, and an inverter housing 14. The discharge housing 12, the motor housing 13, and the inverter housing 14 are made of metal materials. The discharge housing 12, the motor housing 13, and the inverter housing 14 are made of, for example, aluminum.

[0049] 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 in a cylindrical shape from the outer periphery of the end wall 13a. The discharge housing 12 is cylindrical. The discharge housing 12 is connected to the end of the peripheral wall 13b of the motor housing 13 on the opposite side of the end wall 13a. The converter housing 14 is cylindrical. The converter housing 14 is connected to the end wall 13a of the motor housing 13. In addition, the converter chamber S1 is divided by the end wall 13a of the motor housing 13 and the converter housing 14.

[0050] 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 side of the peripheral wall 13b. 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.

[0051] The motor housing 13 has a suction port 13d. The suction port 13d is formed at a portion of the peripheral wall 13b of the motor housing 13 close to the end wall 13a. The suction port 13d allows the inside and outside of the motor housing 13 to communicate. Refrigerant as a fluid is sucked into the suction port 13d from the outside.

[0052] 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 the motor housing 13. Therefore, the housing 11 accommodates the rotating electric machine 20. The rotating shaft 15 is arranged in the motor housing 13 in a state where the axis of the rotating shaft 15 coincides with the axis of the peripheral wall 13b of the motor housing 13. The inverter 17 is accommodated in the inverter chamber S1.

[0053] The compression unit 16 and the rotary electric machine 20 are arranged in the axial direction, that is, the direction in which the axis of the rotary shaft 15 extends. The rotary 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 rotary electric machine 20, and the inverter 17 are arranged in sequence in the axial direction of the rotary shaft 15.

[0054] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is disposed between the compression section 16 and the rotary electric machine 20. Therefore, the shaft support member 18 serves as a partition wall between the rotary electric machine 20 and the compression section 16. Furthermore, the motor chamber S2 is partitioned by the shaft support member 18 and the end wall 13a and the peripheral wall 13b of the motor housing 13. Therefore, the housing 11 includes the motor chamber S2. The motor chamber S2 accommodates the rotary electric machine 20. Refrigerant is sucked into the motor chamber S2 from the suction port 13d.

[0055] The shaft support member 18 has an insertion hole 18h. The insertion hole 18h is formed in the central part of the shaft support member 18. The axis of the insertion hole 18h coincides with the axis of the boss 13c. The first end of the rotating shaft 15 is inserted through 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 on the shaft support member 18 via the radial bearing 19a. In addition, the second end of the rotating shaft 15 is inserted into the inner side of the boss 13c. A radial bearing 19b is provided between the boss 13c and the second end of the rotating shaft 15. The second end of the rotating shaft 15 is rotatably supported on the boss 13c via the radial bearing 19b.

[0056] 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 arranged opposite to the fixed scroll 16a. The compression section 16 is driven by the rotation of the rotating shaft 15. The compression section 16 compresses the refrigerant. A compression chamber S3 with a changeable volume 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. And, the refrigerant compressed by the change in volume of the compression chamber S3 is discharged to the discharge chamber S4. The rotating motor 20 rotates the rotating shaft 15. And, the compression section 16 is driven by the rotation of the rotating shaft 15. The compression section 16 compresses the refrigerant by the rotation of the rotating shaft 15.

[0057] <Schematic Structure of Rotating Electric Machine>

[0058] The rotating electric machine 20 includes a rotor 21 and a stator 22. The stator 22 is cylindrical. The rotor 21 is arranged inside the stator 22. The rotor 21 has 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.

[0059] <Stator core>

[0060] 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, for example, embedding the stator core 23 into the inner circumferential surface of the peripheral wall 13b of the motor housing 13 by 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.

[0061] like Figure 2 and Figure 3As shown, 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. In addition, the axial direction of the yoke 24 is also the axial direction of the stator core 23.

[0062] A plurality of teeth 25 extend from the inner circumferential surface 24a of the yoke 24 toward the radial inner side of the yoke 24. The plurality of teeth 25 are arranged at intervals in the circumferential direction of the yoke 24. The plurality of teeth 25 are arranged at equal intervals in the circumferential direction of the yoke 24. In addition, the circumferential direction of the yoke 24 is also the circumferential direction of the stator core 23. Each tooth 25 extends from the inner circumferential surface 24a of the yoke 24 toward the axis of the stator core 23. In the present embodiment, the stator core 23 has 15 teeth 25. In addition, the number of teeth 25 is not particularly limited, but the number of teeth 25 is a multiple of 3.

[0063] like Figure 3 As shown, both end surfaces of the yoke 24 located in the axial direction are flat surfaces. Both end surfaces of each tooth 25 located in the axial direction of the yoke 24 are flat surfaces. The axial length of the yoke 24 is the same as the axial length of each tooth 25 of the yoke 24. The end surface of the yoke 24 located in one direction in the axial direction and the end surface of each tooth 25 located in one direction in the axial direction of the yoke 24 are located in the same plane. The end surface of the yoke 24 located in the other direction in the axial direction and the end surface of each tooth 25 located in the other direction in the axial direction of the yoke 24 are located in the same plane.

[0064] The end face of the yoke 24 located on one side in the axial direction and the end face of each tooth 25 located on one side in the axial direction of the yoke 24 form the first core end face 23a of the stator core 23 located on one side in the axial direction of the yoke 24. The end face of the yoke 24 located on the other side in the axial direction and the end face of each tooth 25 located on the other side in the axial direction of the yoke 24 form the second core end face 23b of the stator core 23 located on the other side in the axial direction of the yoke 24. Therefore, the stator core 23 has the first core end face 23a and the second core end face 23b. The first core end face 23a is the core end face of the stator core 23 located on one side in the axial direction of the yoke 24. The second core end face 23b is the core end face of the stator core 23 located on the other side in the axial direction of the yoke 24.

[0065] like Figure 1 As shown, the stator core 23 is arranged in the motor case 13 such that the first core end surface 23 a faces the shaft support member 18 in the axial direction of the rotating shaft 15 and the second core end surface 23 b faces the end wall 13 a of the motor case 13 in the axial direction of the rotating shaft 15 .

[0066] like Figure 2 and Figure 3As shown, each tooth 25 has a tooth extension portion 26 and a tooth flange portion 27. The tooth extension portion 26 is in the shape of a thin plate extending from the inner circumferential 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 tooth side surfaces 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 circumferential 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 on the opposite side to the yoke 24. Thus, the tooth flange portion 27 protrudes from the end of the tooth extension portion 26 on the opposite side to the yoke 24 to both sides of the yoke 24 in the circumferential direction.

[0067] The stator core 23 is formed with a slot 30. The slot 30 is formed between teeth 25 adjacent in the circumferential direction of the yoke 24. The slot 30 is a space defined by the inner circumferential surface 24a of the yoke 24, the tooth side surfaces 26a adjacent in the circumferential direction of the yoke 24, and the surface of the tooth flange portion 27 located on the yoke 24 side. In addition, the stator core 23 has a slot opening 31. The slot opening 31 is a gap between tooth flange portions 27 adjacent in the circumferential direction of the yoke 24. The slot opening 31 is connected to the slot 30.

[0068] like Figure 3 , Figure 4 and Figure 5 As shown, the yoke 24 has a plurality of insertion recesses 34. Each insertion recess 34 is formed on the outer peripheral surface of the yoke 24. Each insertion recess 34 opens at the first core end surface 23a of the stator core 23. The plurality of insertion recesses 34 are arranged at equal intervals in the circumferential direction of the yoke 24 with respect to the outer peripheral surface of the yoke 24. For example, four insertion recesses 34 are provided on the yoke 24.

[0069] like Figure 6 As shown, the insertion recess 34 is defined by a pair of side surfaces 34a, a connecting surface 34b, and a bottom surface 34c. The pair of side surfaces 34a are surfaces located on both sides of the circumferential direction of the yoke 24 among the surfaces defining 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 to the axial direction of the yoke 24. The connecting surface 34b connects the edges of the pair of side surfaces 34a located on the radial inner side of the yoke 24. The connecting surface 34b is continuous with the first core end surface 23a. The bottom surface 34c connects the edges of the pair of side surfaces 34a located on the opposite side of the first core end surface 23a in the axial direction of the yoke 24. The bottom surface 34c connects the connecting surface 34b and the outer peripheral surface of the yoke 24. The side surfaces 34 a form inner surfaces of the insertion recess 34 located on both sides in the circumferential direction of the yoke 24 .

[0070] A locking protrusion 35 is provided in each insertion recess 34. 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 long quadrangular prism. When the locking protrusion 35 is viewed from a plane, the length direction of the locking protrusion 35 coincides with the circumferential direction of the yoke 24. The locking protrusion 35 is separated from the bottom surface 34c. The locking protrusion 35 is separated from each side surface 34a.

[0071] <Insulator>

[0072] like Figure 3 As shown, the stator 22 includes a first insulator 50 as an insulator. The first insulator 50 is cylindrical. In addition, the stator 22 includes a second insulator 60 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.

[0073] 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 arranged relative to the stator core 23 in a state where the axis of each insulator base 51 is aligned with the axis of the yoke 24. The axial direction of each insulator base 51 is also the axial direction of the yoke 24. In addition, the circumferential direction of each insulator base 51 is also the circumferential direction of the yoke 24. Moreover, the radial direction of each insulator base 51 is also the radial direction of the yoke 24.

[0074] The first insulator 50 is disposed opposite to the first core end face 23a of the stator core 23 in a state of contact with the first core end face 23a. The second insulator 60 is disposed opposite to the second core end face 23b of the stator core 23 in a state of 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.

[0075] Each insulator tooth portion 52 extends from the inner circumferential surface 51a of each insulator base portion 51 to the radial inner side of the insulator base portion 51. A plurality of insulator tooth portions 52 are arranged at intervals in the circumferential direction of the insulator base portion 51. A plurality of insulator tooth portions 52 are arranged at equal intervals in the circumferential direction of the insulator base portion 51. Each insulator tooth portion 52 extends from the inner circumferential surface 51a of the insulator base portion 51 toward the axis of the insulator base portion 51. In the present embodiment, the first insulator 50 and the second insulator 60 each have 15 insulator tooth portions 52. The number of insulator tooth portions 52 is the same as the number of teeth 25 included in the stator core 23.

[0076] 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 a columnar shape extending from the inner peripheral surface 51a of the insulator base 51 to the radial inner side of the insulator base 51. The width of each insulator extension portion 53 in the circumferential direction of the insulator base 51 is the same as the width of each tooth extension portion 26 in the circumferential direction of the yoke 24. Each insulator extension portion 53 is in contact with each tooth 25. Therefore, each insulator extension portion 53 is arranged at a position overlapping with each tooth extension portion 26 in the axial direction of the yoke 24.

[0077] Each insulator tooth portion 52 has an insulator inner wall 54. Therefore, the first insulator 50 and the second insulator 60 have an insulator inner wall 54. Each insulator inner wall 54 protrudes from the end of each insulator extension portion 53 on the opposite side to the insulator base portion 51 along the insulator base portion 51. Each insulator inner wall 54 protrudes from each insulator extension portion 53 to both sides of the insulator base portion 51 in the circumferential direction and to the side of the insulator base portion 51 in the axial direction opposite to the stator core 23. In this way, each insulator inner wall 54 protrudes from each insulator extension portion 53. Each insulator inner wall 54 is arranged at a position overlapping with respect to the tooth flange portion 27 in the axial direction of the yoke 24.

[0078] The surface 52a of each insulator tooth portion 52 located on the side opposite to the insulator base portion 51 is located on the same plane as the surface 25a of each tooth 25 located on the side opposite to the yoke 24. The surface of each insulator inner wall 54 located on the side opposite to the insulator base portion 51 forms the surface 52a of each insulator tooth portion 52 located on the side opposite to the insulator base portion 51. The surface of each tooth flange portion 27 located on the side opposite to the yoke 24 forms the surface 25a of each tooth 25 located on the side 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 from the axial direction of the yoke 24 at the groove 30.

[0079] Each insulator inner wall 54 has an insertion groove 54a. One insertion groove 54a is formed on each surface of the insulator inner wall 54 located on both sides of the insulator base 51 in the circumferential direction. 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 a part of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24.

[0080] The first insulator 50 has three guide grooves 55. The three guide grooves 55 are arranged in the axial direction of the first insulator 50. The three guide grooves 55 are formed on the outer peripheral 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.

[0081] 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 portion 52 located on the opposite side to the insulator base portion 51. Each insertion recess 61 penetrates the surface 52a of each insulator tooth portion 52 in the axial direction of the insulator base portion 51.

[0082] like Figure 7 As shown, 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 of the insertion recess 61 located on both sides of the circumferential direction of the yoke 24. 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 outside 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.

[0083] <Coil>

[0084] like Figure 2 As shown, the stator 22 includes coils 28. The stator 22 includes coils 28 corresponding to the U phase, the V phase, and the W phase. Therefore, the stator 22 includes coils 28 of multiple phases. Each coil 28 is formed by winding a winding 29 in a concentrated winding manner on the stator core 23. A portion of each coil 28 of each phase passes through each slot 30.

[0085] like Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown in FIG. 2 , the stator 22 includes a first coil end 32 and a second coil end 33. Figure 4 and Figure 5 As shown in FIG. 1 , the first coil end 32 is a portion of each coil 28 of each phase and protrudes from the first core end surface 23a. Figure 8 and Fig. 9As shown, the second coil end 33 is a part of each coil 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 coil 28 of each phase and protrude from the core end face. In this way, the coil 28 is formed by winding the winding 29 on the stator core 23, and includes a coil end that protrudes from the end face of the stator core 23 located in the axial direction of the yoke 24, that is, the core end face.

[0086] like Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown, the coils 28 of each phase are formed by series winding. In the series winding, first, the windings 29 of each phase passing through each slot 30 are wound around each tooth extension portion 26, the insulator extension portion 53 of the first insulator 50, and the insulator extension portion 53 of the second insulator 60. Then, the windings 29 of each phase are sequentially wound by concentrated winding around the tooth extension portions 26, the insulator extension portions 53 of the first insulator 50, and the insulator extension portions 53 of the second insulator 60 arranged every three in the circumferential direction of the stator core 23. Therefore, the coils 28 of each phase are arranged every three in the circumferential direction of the stator core 23. In the present embodiment, five coils 28 of each phase are arranged. The coils 28 of each phase are arranged in each slot 30 so that different phases are adjacent to each other in the circumferential direction of the stator core 23. In this way, the coil 28 is formed by winding the winding 29 passing through the slot 30 around each tooth extending portion 26 , the insulator extending portion 53 of the first insulator 50 , and the insulator extending portion 53 of the second insulator 60 .

[0087] like Figure 4 and Figure 5 As shown, the first insulator 50 insulates the coil 28 of each phase from the first core end surface 23a. The insulator base 51 of the first insulator 50 is arranged at a position overlapping with the first coil end 32 on the radially outer side of the yoke 24. The insulator inner walls 54 of the first insulator 50 are arranged at a position overlapping with the first coil end 32 on the radially inner side of the yoke 24. Therefore, the insulator inner walls 54 of the first insulator 50 are arranged at a position overlapping with the tooth flange portion 27 in the axial direction of the yoke 24 and overlapping with the first coil end 32 on the radially inner side of the yoke 24.

[0088] like Figure 8 and Fig. 9As shown, the second insulator 60 insulates the coil 28 of each phase from the second core end surface 23b. The insulator base 51 of the second insulator 60 is arranged at a position overlapping with the second coil end 33 on the radially outer side of the yoke 24. The insulator inner walls 54 of the second insulator 60 are arranged at a position overlapping with the second coil end 33 on the radially inner side of the yoke 24. Therefore, the insulator inner walls 54 of the second insulator 60 are arranged at a position overlapping with the tooth flange 27 in the axial direction of the yoke 24 and overlapping with the second coil end 33 on the radially inner side of the yoke 24.

[0089] like Figure 4 As shown, the winding 29 of each phase includes a jumper wire 57 connecting the coils 28 of each phase to each other in the circumferential direction of the stator core 23. The jumper wire 57 of each phase is led out from the first coil end 32 of the coil 28 of each phase and guided to the corresponding guide groove 55 through the corresponding through groove 56.

[0090] <Slot Insulation Section>

[0091] like Figure 2 As shown, the stator 22 includes a slot insulating portion 36. One slot insulating portion 36 is disposed in each slot 30. The slot insulating portion 36 is sheet-shaped. The slot insulating portion 36 is formed by bending a strip-shaped insulating sheet in a manner extending along the inner circumferential surface 24a of the yoke 24 and the tooth side surface 26a adjacent to the circumferential direction of the yoke 24. The slot insulating portion 36 is inserted into the slot 30 in a state where the length direction of the slot insulating portion 36 is consistent with the axial direction of the yoke 24. The slot insulating portion 36 extends from the first core end face 23a to the second core end face 23b of the stator core 23, and protrudes axially from both end faces of the first core end face 23a and the second core end face 23b. The slot insulating portion 36 insulates a portion of the coil 28 passing through each slot 30 from the stator core 23.

[0092] like Fig.10 As shown in the figure, the slot insulating portion 36 has an insulating body portion 37. The insulating 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 the tooth side surfaces 26a adjacent to the yoke 24 in the circumferential direction. Therefore, the slot insulating portion 36 extends along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a adjacent to the yoke 24 in the circumferential direction.

[0093] like Fig.11As shown in the figure, the slot insulating portion 36 has a pair of protruding portions 38. Each protruding portion 38 protrudes from both ends of the insulating main body portion 37 located on the side opposite to the inner peripheral surface 24a of the yoke 24 in directions approaching each other. Therefore, the pair of protruding portions 38 protrude from the tooth side surfaces 26a adjacent in the circumferential direction of the yoke 24 in directions approaching each other. And, the pair of protruding portions 38 insulate between each tooth flange portion 27 and the coil 28 located on both sides sandwiching the slot opening 31. Each protruding portion 38 is separated from the tooth flange portion 27.

[0094] <Insulating member>

[0095] like Figure 2 As shown, 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 bending a strip-shaped insulating sheet. The insulating member 46 is inserted into the slot 30 in a state where the length direction of the insulating member 46 is aligned with the axial direction of the yoke 24.

[0096] like Fig.10 and Fig.11 As shown, the insulating member 46 includes 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 tooth flange portions 27 located on both sides of the slot opening 31 and one of the pair of protruding portions 38. The first insulating portion 47 and one of the pair of protruding portions 38 overlap in the radial direction of the yoke 24. Furthermore, the first insulating portion 47 insulates between one of the tooth flange portions 27 located on both sides of the slot opening 31 and one of the coils 28 adjacent to the yoke 24 in the circumferential direction in the slot 30.

[0097] 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. Therefore, each protruding portion 38 and the insulating member 46 overlap in the radial direction of the yoke 24. Furthermore, the second insulating portion 48 insulates 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 in the slot 30.

[0098] The third insulating portion 49 is a V-shaped cross-section that extends from the end of the first insulating portion 47 near 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 the end of the second insulating portion 48 near 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. And, 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 is 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.

[0099] In this way, the insulating member 46 is disposed so as to straddle the slot opening 31 in the circumferential direction of the yoke 24 . The insulating member 46 insulates the tooth flanges 27 located on both sides of the slot opening 31 from the coil 28 .

[0100] like Figure 4 and Figure 8 As shown in FIG. 4 , both ends of the insulating member 46 in the longitudinal direction protrude from the groove 30. Fig.10 As shown, 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 the insulator inner walls 54 that are adjacent in the circumferential direction of the yoke 24 .

[0101] like Fig.10 and Fig.11 As shown in FIG. 1 , the first insulating portion 47 is inserted into one of two insertion grooves 54a formed in a portion of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. The second insulating portion 48 is inserted into the other of two insertion grooves 54a formed in a portion of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. In this way, the insulating member 46 protrudes from the groove 30 into the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24.

[0102] <First Cover Member>

[0103] like Figure 5 As shown, the stator 22 includes a first cover member 65 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 to face the first insulator 50 .

[0104] 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 is opposite to each insulator inner wall 54 of the first insulator 50 in the axial direction of the yoke 24. The end wall 65a is opposite to 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.

[0105] like Figure 1 As shown, the outer peripheral wall 65b of the first cover member 65 is located between the jumper wires 57 of each phase and the peripheral wall 13b of the motor case 13. The outer peripheral wall 65b of the first cover member 65 ensures insulation between the jumper wires 57 of each phase and the motor case 13.

[0106] like Figure 5 As shown, the first cover member 65 has a plurality of plate-shaped locking pieces 66. Each locking piece 66 extends from an end edge 65e on the side opposite to the end wall 65a of the outer peripheral wall 65b of the first cover member 65 in the axial direction of the yoke 24. The plurality of locking pieces 66 are arranged at equal intervals in the circumferential direction of the outer peripheral wall 65b with respect to the outer peripheral wall 65b of the first cover member 65. For example, four locking pieces 66 are provided on the first cover member 65.

[0107] like Fig.12 As shown, each locking piece 66 is composed of a pair of locking claws 67. Each locking claw 67 has an extension piece 67a and a hook piece 67b. Each extension piece 67a is in the shape of an elongated flat plate. Each extension piece 67a extends from the end edge 65e of the outer peripheral wall 65b of the first cover member 65 in the axial direction of the yoke 24. The length direction of each extension piece 67a is consistent with the axial direction of the yoke 24. Each extension piece 67a extends parallel to each other. The hook piece 67b of each locking claw 67 extends from the end of the extension piece 67a of each locking claw 67 on the opposite side of the end edge 65e of the outer peripheral wall 65b in a direction approaching each other. The top ends of each hook piece 67b face each other in the circumferential direction of the yoke 24. The top ends of each hook piece 67b are separated from each other. The side edges of the extending pieces 67 a of the locking claws 67 , which are located on the outer sides in the circumferential direction of the yoke 24 , form the side edges 66 a of the locking pieces 66 , which are located on both sides in the circumferential direction of the yoke 24 .

[0108] like Fig.13As shown, 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. Thus, the pair of locking claws 67 are locked to the locking protrusion 35. In this way, the first cover member 65 is mounted on the stator core 23. And, by the hook piece 67b of each locking claw 67 being locked to the locking protrusion 35, the locking piece 66 does not fall off from the insertion recess 34. In this way, by the locking of the locking protrusion 35 and the hook piece 67b of each locking claw 67, the movement of the first cover member 65 relative to the first insulator 50 in the axial direction of the yoke 24 is restricted. Therefore, the hook piece 67b of each locking claw 67 is a locked portion for the locking protrusion 35 to be locked. Thus, the locking piece 66 is provided with a locked portion for the locking protrusion 35 to be locked.

[0109] like Figure 5 and Fig.14 As shown, the first cover member 65 has a plurality of insertion plate portions 68. Each insertion plate portion 68 extends from the end edge of the inner peripheral wall 65c of the first cover member 65 on the side opposite to the end wall 65a toward the axial direction of the yoke 24. The plurality of insertion plate portions 68 are arranged 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 length direction of each insertion plate portion 68 is consistent with the axial direction of the yoke 24. The side edges of each insertion plate portion 68 located on both sides of 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 the space between the 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 arranged at positions separated from each other in the circumferential direction of the yoke 24 and defining the insertion space 58 for inserting the insertion plate portion 68. Thus, the insertion space 58 is a space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. Furthermore, the pair of space forming walls 59 are side walls of the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The insertion plate portion 68 is not inserted between the adjacent teeth 25 in the circumferential direction of the yoke 24, and is separated from the stator core 23 in the axial direction of the yoke 24.

[0110] like Fig.15 As shown, the insertion plate portion 68 can contact the pair of space forming walls 59 when inserted into the insertion space 58. When the insertion plate portion 68 contacts one of the pair of space forming walls 59, gaps are formed between the side edges 66a of the locking piece 66 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 34 located on both sides of the circumferential direction of the yoke 24, that is, the pair of side surfaces 34a. By the insertion plate portion 68 contacting one of the pair of space forming walls 59, the movement of the first cover member 65 in the circumferential direction of the yoke 24 relative to the first insulator 50 is restricted.

[0111] <Second Cover Member>

[0112] like Fig. 9 As shown, the stator 22 includes a second cover member 70 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 arranged on the side opposite to the second core end face 23b with respect to the second coil end 33 in the axial direction of the yoke 24. The second cover member 70 is arranged opposite to the second insulator 60.

[0113] The second cover member 70 has a cylindrical main body 71 and a plate-like extension wall 72. The main body 71 is opposite to the inner wall 54 of each insulator of the second insulator 60 in the axial direction of the yoke 24. The extension wall 72 extends from a part of the outer peripheral edge of the main body 71 to the radially outer side of the yoke 24. The extension wall 72 is in the shape of a thin plate. An insulating storage portion 73 is provided in the extension wall 72. The storage portion 73 is, for example, in the shape of a square cylinder. The storage portion 73 stores a neutral point connection portion (not shown) that forms a neutral point by electrically connecting the ends of the lead wires 74 of each phase led out from the second coil end 33.

[0114] like Fig. 9 and Fig.16 As shown, the second cover member 70 has a plurality of plate-shaped locking pieces 75. Each locking piece 75 extends from the inner peripheral edge of the main body 71 of the second cover member 70 in the axial direction of the yoke 24. The plurality of locking pieces 75 are arranged at equal intervals in the circumferential direction of the main body 71 with respect to the main body 71 of the second cover member 70.

[0115] like Fig.17 As shown, the locking piece 75 is in the shape of an elongated plate. The length direction of the locking piece 75 coincides with the axial direction of the main body 71. The side edges 75a of the locking piece 75 located on both sides of the circumferential direction of the main body 71 extend parallel to each other in the axial direction of the main body 71.

[0116] The locking piece 75 is provided with a locking protrusion 76. The locking protrusion 76 protrudes radially from the surface of the top end of the locking piece 75 located on the radial outer side of the main body 71 toward the yoke 24. The surface of the locking protrusion 76 located on the radial outer side of the main body 71 is a tapered surface 76a. The tapered surface 76a is inclined toward the radial inner side of the main body 71 as it goes toward the top end of the locking piece 75.

[0117] like Fig.18As shown, 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 arranged on the second connection surface 61c. At this time, since the surface of the locking protrusion 76 located on the radial outer side of the main body 71 becomes a tapered surface 76a, the locking protrusion 76 easily passes over the first connection surface 61b. In addition, the locking protrusion 76 is locked to the step surface 61d of the insertion recess 61, and the locking piece 75 does not fall off from the insertion recess 61. In this way, the second cover member 70 is installed on the second insulator 60. In addition, by the locking of the locking protrusion 76 and the step surface 61d of the insertion recess 61, the movement of the second cover member 70 relative to the second insulator 60 in the axial direction of the yoke 24 is restricted. Therefore, the step surface 61d of the insertion recess 61 is a locked portion to be locked by the locking protrusion 76. Thus, the insertion recess 61 is provided with a locked portion to be locked by the locking protrusion 76.

[0118] Thus, 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. The second cover member 70 is attached to the second insulator 60 in a state where the circumferential direction of the main body 71 coincides with the circumferential direction of the yoke 24 and the axial direction of the main body 71 coincides with the axial direction of the yoke 24.

[0119] like Fig.16 As shown, 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 to the axial direction of the yoke 24. The plurality of insertion plate portions 77 are arranged at equal intervals in the circumferential direction of the main body portion 71 with respect to 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 length 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 of 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 the space between the 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 arranged at positions separated from each other in the circumferential direction of the yoke 24 and defining an insertion space 62 for inserting the insertion plate portion 77. The insertion space 62 is a space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The pair of space forming walls 63 are side walls of the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The insertion plate portion 77 is not inserted between the adjacent teeth 25 in the circumferential direction of the yoke 24, and is separated from the stator core 23 in the axial direction of the yoke 24.

[0120] 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 toward the axial direction of the yoke 24. The plurality of insertion plate portions 78 are arranged at equal intervals in the circumferential direction of the main body portion 71 with respect to 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 length direction of each insertion plate portion 78 is consistent with the axial direction of the yoke 24. The side edges of each insertion plate portion 78 located on both sides of the circumferential direction of the yoke 24 extend in parallel with each other in the axial direction of the yoke 24.

[0121] Each insertion plate portion 78 is inserted into an insertion recess 61 in which no locking piece 75 is inserted among the plurality of insertion recesses 61. A pair of side walls forming a pair of side surfaces 61a of the insertion recess 61 in which no locking piece 75 is inserted among the plurality of insertion recesses 61 are a pair of space forming walls 81 which are arranged at positions separated 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 which are arranged at positions separated 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 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 insertion plate portion 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.

[0122] In addition, on the main body 71 of the second cover member 70, in the circumferential direction of the main body 71, 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 with intervals in this order.

[0123] like Fig.19 As shown, the insertion plate portion 77 can contact the pair of space forming walls 63 when inserted into the insertion space 62. In addition, 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. In the state where the insertion plate portions 77 and 78 contact one of the pair of space forming walls 63 and 81, gaps are formed between the side edges 75a of the locking piece 75 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 61 located on both sides of the circumferential direction of the yoke 24, that is, the pair of side surfaces 61a. By the insertion plate portions 77 and 78 contacting one of the pair of space forming walls 63 and 81, the movement of the second cover member 70 relative to the second insulator 60 in the circumferential direction of the yoke 24 is restricted.

[0124] <Bearing surface>

[0125] like Fig.10 and Fig.11As shown, the insert plate portions 68 and 77 are inserted into the space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24, and have a support surface 85 for supporting the insulating member 46 from the radial inner side of the yoke 24. The support surface 85 is a surface of the insert plate portions 68 and 77 located on the radial outer side of the yoke 24. Fig.11 As shown, the support surface 85 is located radially outside the yoke 24 relative to the slot opening 31 when viewed from the axial direction of the yoke 24. The support surfaces 85 of the insertion plate portion 68 and the insertion plate portion 77 support the first insulating portion 47 and the second insulating portion 48 of the insulating member 46, which protrude from the slot 30 and are closer to the third insulating portion 49 than the portions inserted into the two insertion slots 54a.

[0126] <Maintaining section>

[0127] The insert plate portions 68 and 77 include a retaining portion 86. The retaining portion 86 protrudes radially outward of the yoke 24 from the central portion of the surface of the insert plate portions 68 and 77 located radially outward of the yoke 24. The retaining portion 86 is integrally formed with the insert plate portions 68 and 77. The retaining portion 86 is arranged between the first insulating portion 47 and the second insulating portion 48 of the insulating member 46 in the circumferential direction of the yoke 24. The retaining portion 86 is in contact with the end portion of the third insulating portion 49 on the first insulating portion 47 side and the end portion of the third insulating portion 49 on the second insulating portion 48 side, respectively. In addition, the retaining portion 86 maintains the opening amount of the third insulating portion 49 in order to maintain the separation distance between the connection portion of the first insulating portion 47 and the third insulating portion 49, that is, the first connecting portion 46a and the connection portion of the second insulating portion 48 and the third insulating portion 49, that is, the second connecting portion 46b in the circumferential direction of the yoke 24.

[0128] <Airtight terminal>

[0129] like Figure 1 As shown in FIG. 1 , the electric compressor 10 includes an airtight terminal 40. The airtight 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. Figure 1 , only one conductive member 41 is shown. Each conductive member 41 is a cylindrical metal terminal extending in a straight line. The first end of each conductive member 41 is electrically connected to the converter 17 in the converter chamber S1. The second end of each conductive member 41 protrudes from the converter chamber S1 into the motor housing 13 through the hole 13h. In addition, the airtight terminal 40 has 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 in the outer surface of the end wall 13a of the motor housing 13 in the converter chamber S1.

[0130] The stator 22 includes a lead wire 43. The lead wire 43 is led out from the rotating electrical machine 20. The lead wire 43 is led out from the second coil end 33 of each coil 28 of each phase. Thus, three lead wires 43 are led out from the rotating electrical machine 20. Figure 1 In the figure, only one lead 43 is protruding.

[0131] The stator 22 includes a cluster block 44. The cluster block 44 accommodates 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 and each lead wire 43.

[0132] The electric power from the inverter 17 is supplied to the rotating electric machine 20 via each conductive member 41 , each connection terminal 45 , and each lead wire 43 . As a result, the rotating electric machine 20 is driven. Therefore, the inverter 17 drives the rotating electric machine 20 .

[0133] like Fig. 9 As shown, the extension wall 72 of the second cover member 70 holds the three lead wires 43 in a state of being pressed toward the second coil end 33. Thus, the cluster block 44 is positioned relative to the stator core 23.

[0134] [Effects of implementation methods]

[0135] Next, the operation of this embodiment will be described.

[0136] For example, if the rotating electric machine 20 vibrates, friction in the axial direction of the yoke 24 is generated between the insertion plate portion 68 inserted in the insertion space 58 and one of the pair of space forming walls 59. Therefore, in accordance with the friction in the axial direction of the yoke 24 generated between the insertion plate portion 68 and one of the pair of space forming walls 59, the friction in the axial direction of the yoke 24 between the locking piece 66 and the insertion recess 34 is suppressed. In particular, in a state where the insertion plate portion 68 is in contact with one of the pair of space forming walls 59, gaps are formed between the side edges 66a of the locking piece 66 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 34 located on both sides of the circumferential direction of the yoke 24, that is, a pair of side surfaces 34a. Thus, friction is avoided between the side edges 66a of the locking piece 66 located on both sides of the circumferential direction of the yoke 24 and the pair of side surfaces 34a of the insertion recess 34 located on both sides of the circumferential direction of the yoke 24. Therefore, the development of friction between the locking piece 66 and the insertion recess 34 is suppressed. As a result, it is possible to avoid a problem that the locking of the locking protrusion 35 and the hook piece 67b of the locking claw 67 is released due to the breakage of the locking piece 66. Therefore, it is possible to avoid a problem that the first cover member 65 falls off relative to the first insulator 50 in the axial direction of the yoke 24.

[0137] Similarly, when the rotating electric machine 20 vibrates, friction in the axial direction of the yoke 24 is generated 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. Therefore, in accordance with the friction in the axial direction of the yoke 24 generated between the insertion plate portions 77, 78 and one of the pair of space forming walls 63, 81, friction in the axial direction of the yoke 24 between the locking piece 75 and the insertion recess 61 is suppressed. In particular, in a state where the insertion plate portions 77, 78 are in contact with one of the pair of space forming walls 63, 81, gaps are formed between the side edges 75a of the locking piece 75 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 61 located on both sides of the circumferential direction of the yoke 24, that is, the pair of side surfaces 61a. Thus, friction is avoided between the side edges 75a of the locking piece 75 located on both sides of the yoke 24 in the circumferential direction and the pair of side faces 61a of the insertion recess 61 located on both sides of the yoke 24 in the circumferential direction. Therefore, the development of friction between the locking piece 75 and the insertion recess 61 is suppressed. Thus, the problem that the locking of the locking protrusion 76 and the step surface 61d is released due to the breaking of the locking piece 75 can be avoided. Therefore, the problem that the second cover member 70 falls off relative to the second insulator 60 in the axial direction of the yoke 24 can be avoided.

[0138] By inserting the insert plate portions 68 and 77 into the space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24, the support surfaces 85 of the insert plate portions 68 and 77 support the insulating member 46 from the radial inner side of the yoke 24. At this time, the support surface 85 is located radially outward of the yoke 24 relative to the slot opening 31 when viewed from the axial direction of the yoke 24, thereby restricting the insulating member 46 from approaching the slot opening 31 further. As a result, it is easy to ensure the insulation distance between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28.

[0139] [Effects of Embodiment]

[0140] In the above embodiment, the following effects can be obtained. In the description of the effects of the embodiments (1) to (3) described below, the effects related to the second cover member 70 are described in detail. The effects related to the first cover member 65 and the effects related to the second cover member 70 are the same, so their detailed description is omitted.

[0141] (1) The second cover member 70 includes the insertion plate portions 77 and 78 extending in the axial direction of the yoke 24. The insulator inner wall 54 includes a pair of space forming walls 63 and 81 which are arranged at positions separated from each other in the circumferential direction of the yoke 24 and define the insertion spaces 62 and 80 into which the insertion plate portions 77 and 78 are inserted. The insertion plate portions 77 and 78 can contact the pair of space forming walls 63 and 81 when inserted into the insertion spaces 62 and 80. For example, if the rotary electric machine 20 vibrates, friction in the axial direction of the yoke 24 is generated between the insertion plate portions 77 and 78 inserted into the insertion spaces 62 and 80 and one of the pair of space forming walls 63 and 81. Therefore, in accordance with the friction in the axial direction of the yoke 24 generated between the insertion plate portions 77 and 78 and one of the pair of space forming walls 63 and 81, the friction in the axial direction of the yoke 24 between the locking piece 75 and the insertion recess 61 is suppressed. Therefore, the development of friction between the locking piece 75 and the insertion recess 61 can be suppressed. Thus, the problem that the locking protrusion 76 and the stepped surface 61d are released due to the breakage of the locking piece 75 can be avoided. Therefore, the problem that the second cover member 70 falls off in the axial direction of the yoke 24 relative to the second insulator 60 can be avoided. As a result, the reliability of the stator 22 of the rotary electric machine 20 can be improved.

[0142] (2) When the insertion plates 77 and 78 are in contact with one of the pair of space forming walls 63 and 81, gaps are formed between the side edges 75a of the locking piece 75 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 61 located on both sides of the circumferential direction of the yoke 24, that is, the pair of side surfaces 61a. Thus, it is possible to avoid friction between the side edges 75a of the locking piece 75 located on both sides of the circumferential direction of the yoke 24 and the inner surfaces of the insertion recess 61 located on both sides of the circumferential direction of the yoke 24, that is, the pair of side surfaces 61a.

[0143] (3) The insertion space 62 is a space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. The pair of space forming walls 63 are side walls of the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. Thus, the friction between the locking piece 75 and the insertion recess 61 can be suppressed by simply inserting the insertion plate portion 77 into the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. Therefore, the structure of the stator 22 can be simplified.

[0144] (4) The second cover member 70 has a locking piece 75, and the insulator inner wall 54 of the second insulator 60 has an insertion recess 61. Thus, the insertion plate portion 77, the pair of space forming walls 63, the locking piece 75, and the insertion recess 61 are arranged at the radial inner side of the yoke 24 relative to the second coil end 33. Therefore, for example, compared with the case where the locking piece 75 and the insertion recess 61 are arranged at the radial outer side of the yoke 24 relative to the second coil end 33, the locking piece 75 and the insertion recess 61 can be brought as close to the insertion plate portion 77 and the pair of space forming walls 63 as possible. As a result, the dimensional tolerance of the components between the locking piece 75 and the insertion recess 61 and the insertion plate portion 77 and the pair of space forming walls 63 is difficult to accumulate. Therefore, the friction between the locking piece 75 and the insertion recess 61, which is achieved by the friction between the insertion plate portion 77 and the space forming wall 63, can be appropriately suppressed.

[0145] (5) The insert plate portions 68 and 77 are inserted into the space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24, and the support surfaces 85 of the insert plate portions 68 and 77 support the insulating member 46 from the radial inner side of the yoke 24. At this time, the support surface 85 is located radially outside the yoke 24 relative to the slot opening 31 when viewed from the axial direction of the yoke 24, thereby restricting the insulating member 46 from approaching the slot opening 31 further. As a result, it is easy to ensure the insulation distance between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28. As a result, it is possible to suppress the insulation failure between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28, thereby improving the reliability of the stator 22 of the rotating electric machine 20.

[0146] (6) The protruding portions 38 of the slot insulating portion 36 and the insulating member 46 overlap in the radial direction of the yoke 24. Therefore, the insulation distance between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28 can be easily extended compared to the case where the protruding portions 38 are not provided. As a result, it is easier to suppress the insulation failure between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28, so the reliability of the stator 22 of the rotary electric machine 20 can be further improved.

[0147] (7) The insert plate portions 68 and 77 include the retaining portion 86 for retaining the amount of opening of the third insulating portion 49 in order to maintain the separation distance 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, in the circumferential direction of the yoke 24. Thus, the distance from the slot opening 31 to the end edge of the first insulating portion 47 on the opposite side of the connecting portion with the third insulating portion 49 and the distance from the slot opening 31 to the end edge of the second insulating portion 48 on the opposite side of the connecting portion with the third insulating portion 49 can be extended as much as possible. Therefore, the insulation distance between each of the tooth flange portions 27 located on both sides sandwiching the slot opening 31 and the coil 28 can be easily extended. As a result, it is easier to suppress the insulation failure between each of the tooth flange portions 27 located on both sides sandwiching the slot opening 31 and the coil 28, so that the reliability of the stator 22 of the rotating electric machine 20 can be further improved.

[0148] (8) The insert plate portions 68 and 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. Thus, the support surface 85 of the insert plate portions 68 and 77 supports only the portion of the insulating member 46 protruding from the slot 30 to the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24 from the radial inner side of the yoke 24. Therefore, since the insert plate portions 68 and 77 are separated from the stator core 23, for example, when the rotating electric machine 20 vibrates, it is possible to avoid problems such as friction between the insert plate portions 68 and 77 and the stator core 23 due to contact between the insert plate portions 68 and 77 and the stator core 23. Thus, 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.

[0149] [Example of Change]

[0150] In addition, the above-mentioned embodiment can be implemented by modification as follows. The above-mentioned embodiment and the following modification examples can be implemented by combining with each other within the range that there is no technical contradiction.

[0151] ○ If Fig. 20As shown, for example, the insertion plate portion 77 may be inserted between teeth 25 adjacent in the circumferential direction of the yoke 24 through the space between the insulator inner walls 54 adjacent in the circumferential direction of the yoke 24. Thus, the support surface 85 of the insertion plate portion 77 supports the portion of the insulating member 46 located in the slot 30 from the radial inner side of the yoke 24 in addition to the portion of the insulating member 46 protruding from the slot 30 to the space between the insulator inner walls 54 adjacent in the circumferential direction of the yoke 24. Therefore, the insulating member 46 can be stably supported from the radial inner side of the yoke 24 by the support surface 85 of the insertion plate portion 77. Thus, it is possible to further easily restrict the insulating member 46 from further approaching the slot opening 31. Therefore, it is possible to further easily ensure the insulation distance between each of the tooth flange portions 27 located on both sides of the slot opening 31 and the coil 28. As a result, it is possible to more easily suppress insulation failure between the coils 28 and the tooth flange portions 27 located on both sides sandwiching the slot opening 31 , and thus the reliability of the stator 22 of the rotary electric machine 20 can be further improved.

[0152] In the embodiment, the second cover member 70 may not include the insertion plate portion 78 .

[0153] In the embodiment, the second cover member 70 may not include the insertion plate portion 77 .

[0154] In the embodiment, for example, the insulator inner wall 54 of the second insulator 60 may have a locking piece, and the second cover member 70 may have an insertion recess for inserting the locking piece. In short, one of the cover member and the insulator inner wall 54 may have a locking piece, and the other of the cover member and the insulator inner wall 54 may have an insertion recess for inserting the locking piece.

[0155] In the embodiment, the insulator inner wall 54 of the second insulator 60 may not have the insertion recess 61. Also, for example, the insulator base 51 of the second insulator 60 may have the insertion recess. In this case, the locking piece 75 is configured to extend from the main body 71 to the radially outer side of the main body 71 and to be insertable into the insertion recess formed in the insulator base 51 of the second insulator 60.

[0156] 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 for inserting the locking piece. In short, one of the cover member and the insulator may have a plate-shaped locking piece, and the other of the cover member and the insulator may have an insertion recess for inserting the locking piece.

[0157] ○ 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 for inserting the locking piece. 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 for inserting the locking piece. In this way, one of the cover member and the insulator may have a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the insulator may have an insertion recess for inserting the locking piece, or one of the cover member and the yoke may have a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the yoke may have an insertion recess for inserting the locking piece. In addition, in this case, a locking protrusion protruding radially of the yoke may be provided on one of the locking piece and the insertion recess, and a locked portion for locking the locking protrusion may be provided on the other of the locking piece and the insertion recess. In addition, the structure of the locked portion provided on the other of the locking piece and the insertion recess may be a convex portion or a concave portion.

[0158] In the embodiment, the locking pieces 66 and 75 and the insertion recesses 34 and 61 may not be arranged at equal intervals in the circumferential direction.

[0159] In the embodiment, the insertion plate portions 68 , 77 , 78 may not be arranged at equal intervals in the circumferential direction.

[0160] In the embodiment, the insertion plate parts 68 and 77 may not have the support surface 85 .

[0161] In the embodiment, the slot insulating portion 36 may not include the pair of protruding portions 38 .

[0162] In the embodiment, the slot insulating portion 36 may be a resin layer formed by integrally molding a resin in advance on the inner peripheral surface 24 a of the yoke 24 and the tooth side surfaces 26 a adjacent to each other in the circumferential direction of the yoke 24 .

[0163] In the embodiment, the insulating member 46 is a V-shaped cross-section having a first insulating portion 47, a second insulating portion 48, and a third insulating portion 49, but is not limited thereto. For example, it may be a flat plate disposed in the slot 30 in a state spanning the slot opening 31 in the circumferential direction of the yoke 24. The flat plate-shaped insulating member insulates the tooth flange portions 27 located on both sides of the slot opening 31 from the coil 28. In short, the insulating member 46 may insulate the tooth flange portions 27 located on both sides of the slot opening 31 from the coil 28, and the shape of the insulating member 46 is not particularly limited.

[0164] In the embodiment, the insulating member 46 is a bendable insulating sheet, but the present invention is not limited thereto and may be, for example, a molded member.

[0165] In the embodiment, the insertion plate portions 68 and 77 may not include the holding portion 86 .

[0166] In the embodiment, the compression unit 16 is not limited to the scroll type, and may be, for example, a piston type, a vane type, or the like.

[0167] In the embodiment, the electric compressor 10 is used in a vehicle air conditioner, but the present invention is not limited thereto. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and the compressor 16 may compress air as a fluid supplied to a fuel cell.

[0168] [Note]

[0169] The above-mentioned embodiment includes the configurations described in the following supplementary notes.

[0170] <Additional Note 1>

[0171] A stator of a rotating electric machine, comprising:

[0172] A stator core having a cylindrical yoke and a plurality of teeth extending from an inner peripheral surface of the yoke to a radially inner side of the yoke;

[0173] a coil formed by winding a winding on the stator core and including a coil end protruding from an end face of the stator core located in the axial direction of the yoke, that is, a core end face;

[0174] an insulator disposed opposite to the core end surface and insulating between the coil end and the core end surface; and

[0175] a cover member arranged opposite to the insulator,

[0176] Each of the teeth has:

[0177] a tooth extension extending from the inner peripheral surface of the yoke; and

[0178] tooth flange portions protrude in the circumferential direction from tooth side surfaces of the tooth extension portion located on both sides of the yoke in the circumferential direction, respectively;

[0179] The insulator has:

[0180] A cylindrical insulator base is arranged at a position overlapping the coil end on the radially outer side;

[0181] a plurality of insulator extension portions extending from the inner peripheral surface of the insulator base portion toward the radially inner side of the insulator base portion and arranged at positions overlapping with the respective tooth extension portions in the axial direction; and

[0182] an insulator inner wall protruding from each of the insulator extension portions and arranged at a position overlapping with the tooth flange portion in the axial direction and overlapping with the coil end on the radially inner side of the yoke,

[0183] One of the cover member and the insulator has a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the insulator has an insertion recess for inserting the locking piece, or one of the cover member and the yoke has a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the yoke has an insertion recess for inserting the locking piece,

[0184] A locking protrusion protruding in the radial direction of the yoke is provided on one side of the locking piece and the insertion recess, and a locked portion to be locked by the locking protrusion is provided on the other side of the locking piece and the insertion recess.

[0185] The locking of the locking protrusion and the locked portion restricts the cover member from moving in the axial direction relative to the insulator.

[0186] The stator is characterized in that

[0187] The cover member includes an insertion plate portion extending in the axial direction,

[0188] The insulator inner wall has a pair of space forming walls which are arranged at positions separated from each other in the circumferential direction and define an insertion space into which the insertion plate portion is inserted.

[0189] The insertion plate portion may be in contact with the pair of space forming walls when inserted into the insertion space.

[0190] <Note 2>

[0191] The stator of the rotating electrical machine according to <Supplementary Note 1> is characterized in that:

[0192] When the insertion plate portion is in contact with one of the pair of space forming walls, gaps are formed between side edges of the locking piece located on both sides in the circumferential direction and inner surfaces of the insertion recessed portion located on both sides in the circumferential direction.

[0193] <Addendum 3>

[0194] The stator of the rotating electrical machine according to <Supplementary Note 1> or <Supplementary Note 2> is characterized in that:

[0195] The insertion space is a space between inner walls of the insulator adjacent to each other in the circumferential direction.

[0196] The pair of space forming walls are side walls of the inner wall of the insulator adjacent to each other in the circumferential direction.

[0197] <Note 4>

[0198] The stator of the rotating electrical machine according to any one of <Supplementary Note 1> to <Supplementary Note 3>, characterized in that:

[0199] One of the cover member and the inner wall of the insulator has the locking piece,

[0200] The other of the cover member and the inner wall of the insulator has the insertion recess.

[0201] <Addendum 5>

[0202] The stator of the rotating electrical machine according to <Supplementary Note 3> is characterized in that:

[0203] The stator core has slots formed between teeth adjacent to each other in the circumferential direction of the yoke.

[0204] The coil is formed by winding a winding passing through the slot on the tooth extension portion and the insulator extension portion.

[0205] The stator has:

[0206] a slot insulating portion extending along the inner circumferential surface of the yoke and the tooth side surfaces adjacent to each other in the circumferential direction, and insulating the stator core from the coil in the slot; and

[0207] The insulating member is arranged in a state of spanning a gap between tooth flanges adjacent to each other in the circumferential direction, that is, a slot opening, and insulates the tooth flanges located on both sides of the slot opening from the coil.

[0208] The insertion plate portion has a support surface that is inserted into a space between inner walls of the insulator that are adjacent in the circumferential direction and supports the insulating member from the radially inner side.

[0209] The support surface is located radially outward of the groove opening when viewed from the axial direction.

Claims

1. A stator of a rotating electrical machine, comprising: A stator core having a cylindrical yoke and a plurality of teeth extending from an inner peripheral surface of the yoke to a radially inner side of the yoke; a coil formed by winding a winding on the stator core and including a coil end protruding from an end face of the stator core located in the axial direction of the yoke, that is, a core end face; an insulator, arranged facing the core end surface and insulating the coil end from the core end surface; and a cover member arranged opposite to the insulator, Each of the teeth has: a tooth extension extending from the inner peripheral surface of the yoke; and tooth flange portions protrude in the circumferential direction from tooth side surfaces of the tooth extension portion located on both sides of the yoke in the circumferential direction, respectively; The insulator has: A cylindrical insulator base is arranged at a position overlapping the coil end on the radially outer side; a plurality of insulator extension portions extending from the inner peripheral surface of the insulator base portion to the radially inner side of the insulator base portion and arranged at positions overlapping with the respective tooth extension portions in the axial direction; and an insulator inner wall protruding from each of the insulator extension portions and arranged at a position overlapping with the tooth flange portion in the axial direction and overlapping with the coil end on the radially inner side of the yoke, One of the cover member and the insulator has a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the insulator has an insertion recess for inserting the locking piece, or one of the cover member and the yoke has a plate-shaped locking piece extending in the axial direction, and the other of the cover member and the yoke has an insertion recess for inserting the locking piece, A locking protrusion protruding in the radial direction of the yoke is provided on one side of the locking piece and the insertion recess, and a locked portion to be locked by the locking protrusion is provided on the other side of the locking piece and the insertion recess. The locking of the locking protrusion and the locked portion restricts the cover member from moving in the axial direction relative to the insulator. The stator is characterized in that The cover member includes an insertion plate portion extending in the axial direction, The insulator inner wall has a pair of space forming walls which are arranged at positions spaced apart from each other in the circumferential direction and define an insertion space into which the insertion plate portion is inserted. The insertion plate portion may be in contact with the pair of space forming walls when inserted into the insertion space.

2. The stator of a rotating electrical machine according to claim 1, characterized in that: When the insertion plate portion is in contact with one of the pair of space forming walls, gaps are formed between side edges of the locking piece located on both sides in the circumferential direction and inner surfaces of the insertion recessed portion located on both sides in the circumferential direction.

3. The stator of a rotating electrical machine according to claim 1 or 2, characterized in that: The insertion space is a space between inner walls of the insulator adjacent to each other in the circumferential direction. The pair of space forming walls are side walls of the inner wall of the insulator adjacent to each other in the circumferential direction.

4. The stator of a rotating electrical machine according to claim 1, characterized in that: One of the cover member and the inner wall of the insulator has the locking piece, The other of the cover member and the inner wall of the insulator has the insertion recess.

5. The stator of a rotating electrical machine according to claim 3, characterized in that: The stator core has slots formed between teeth adjacent to each other in the circumferential direction of the yoke. The coil is formed by winding a winding passing through the slot on the tooth extension portion and the insulator extension portion. The stator has: A slot insulating portion extending along the inner circumferential surface of the yoke and the tooth side surfaces adjacent to each other in the circumferential direction, and insulating the stator core from the coil in the slot; and The insulating member is arranged in a state of spanning a gap between tooth flanges adjacent to each other in the circumferential direction, that is, a slot opening, and insulates the tooth flanges located on both sides of the slot opening from the coil. The insertion plate portion is inserted into a space between inner walls of the insulator adjacent to each other in the circumferential direction and has a support surface for supporting the insulating member from the radial inner side. The support surface is located radially outward of the groove opening when viewed from the axial direction.

Images