STATOR OF A ROTATING ELECTRIC MACHINE

Abstract

A stator (22) of a rotating electrical machine (10) comprises: a stator core (23) which includes a yoke (24); an insulator (50, 60) having a plurality of insulator extension sections (53) and a plurality of insulator inner walls (54), each extending from the corresponding insulator extension section (53); and a cover (65, 70). The cover (65, 70) has an insert plate (68, 77, 78) extending in an axial direction of the yoke (24). The adjacent insulator inner walls (54) act together to form a pair of space-forming walls (59, 63, 81).One of the pair of space-defining walls (59, 63, 81) is spaced from the other pair of space-defining walls (59, 63, 81) in a circumferential direction of the yoke (24) and interacts with the other pair of space-defining walls (59, 63, 81) to define an insertion space (58, 62, 80) into which the insertion panel (68, 77, 78) is inserted. The insertion panel (68, 77, 78) is configured to come into contact with the pair of space-defining walls (59, 63, 81) when the insertion panel (68, 77, 78) is inserted into the insertion space (58, 62, 80).

Description

[0001] The present invention relates to a stator of a rotating electrical machine. STATE OF THE ART

[0002] A stator of a rotating electrical machine includes a stator core, a coil, and an insulator, as described, for example, in Japanese Patent Application No. 2022-150980. The stator core includes a yoke having a cylindrical shape and a plurality of teeth. Each of the plurality of teeth (i.e., a tooth) extends from an inner peripheral surface of the yoke inward in the radial direction of the yoke. The tooth has a tooth extension portion and a tooth end portion. The tooth extension portion extends from the inner peripheral surface of the yoke. The tooth end portion extends from tooth side surfaces of the tooth extension portion, which define the tooth extension portion in the circumferential direction of the yoke, along the circumferential direction of the yoke. The coil is formed from a wire wound around the stator core.The stator core has a core end face that defines the stator core in the axial direction of the yoke, and the coil has a coil end that protrudes from the core end face. The insulator faces the core end face of the stator core. The insulator electrically insulates the core end face from the coil end.

[0003] The insulator includes a cylindrical insulator base portion, a plurality of insulator extension portions, and a plurality of insulator inner walls. The insulator base portion is located outside the coil end and overlaps the coil end in the radial direction of the yoke. Each of the insulator extension portions extends inward from an inner peripheral surface of the insulator base portion in the radial direction of the insulator base portion. The insulator extension portion overlaps the corresponding tooth extension portion in the axial direction of the yoke. The insulator inner wall extends from the corresponding insulator extension portion and is located inside the coil end in the radial direction of the yoke, so that the insulator inner wall overlaps the corresponding tooth end portion in the axial direction of the yoke and overlaps the coil end in the radial direction of the yoke.

[0004] Such a stator of the rotating electrical machine may include a cover facing the insulator. One of the cover and the insulator each includes an engaging piece having a plate shape and extending in the axial direction of the yoke, and an insertion recess into which the engaging piece is inserted, or one of the cover and the yoke each includes the engaging piece and the insertion recess into which the engaging piece is inserted. One of the engaging piece and the insertion recess each includes a first engaging portion protruding in the radial direction of the yoke and a second engaging portion engaging with the first engaging portion.

[0005] The engaging piece has side edges that define the engaging piece in the circumferential direction of the yoke, and the insertion recess has inner surfaces that define the insertion recess in the circumferential direction of the stator core. One of the side edges of the engaging piece contacts one of the inner surfaces of the insertion recess. Accordingly, the cover is prevented from shifting relative to the insulator in the circumferential direction of the yoke. Furthermore, the engagement of the first engaging portion and the second engaging portion prevents the cover from shifting relative to the insulator in the axial direction of the yoke.

[0006] In such a configuration of the stator of the rotating electric machine, when the rotating electric machine vibrates, friction may occur in the axial direction of the yoke between the side edges of the engagement piece and the inner surfaces of the insertion recess. If the friction between the engagement piece and the insertion recess progresses, the engagement piece may break. The breakage of the engagement piece may cause the first engagement portion and the second engagement portion to detach and may cause the cover to come out of the insulator in the axial direction of the yoke. This may reduce the reliability of the stator of the rotating electric machine.

[0007] The present invention, made in view of the problem described above, is directed to providing a stator of a rotating electrical machine having increased reliability. SUMMARY

[0008] According to one aspect of the present invention, a stator of a rotating electric machine is provided. The stator comprises: a stator core; a coil; an insulator; and a cover. The stator core includes a yoke having a cylindrical shape and a core end surface defining the stator core in an axial direction of the yoke. The stator core includes a plurality of teeth each extending from an inner peripheral surface of the yoke inward in a radial direction of the yoke. Each of the plurality of teeth includes: a tooth extending portion extending from the inner peripheral surface of the yoke and having tooth side surfaces defining the tooth extending portion in a circumferential direction of the yoke; and a tooth end portion extending from the tooth side surfaces of the tooth extending portion along the circumferential direction of the yoke.The coil is formed from a wire wound around the stator core. The coil has a coil end protruding from the core end surface of the stator core. The insulator faces the core end surface of the stator core and electrically insulates the core end surface from the coil end. The insulator includes: an insulator base portion having a cylindrical shape and disposed outside the coil end and overlapping the coil end in the radial direction of the yoke; a plurality of insulator extension portions each extending inward from an inner peripheral surface of the insulator base portion in a radial direction of the insulator base portion and overlapping the corresponding tooth extension portion in the axial direction of the yoke; and a plurality of insulator inner walls each extending from the corresponding insulator extension portion.Each of the insulator inner walls is located inside the coil end in the radial direction of the yoke, so that the insulator inner wall overlaps the corresponding tooth end portion in the axial direction of the yoke and overlaps the coil end in the radial direction of the yoke. The cover faces the insulator. One of the cover and the insulator each includes an engaging piece having a plate shape and extending in the axial direction, and an insertion recess into which the engaging piece is inserted, or one of the cover and the yoke each includes the engaging piece and the insertion recess.One and the other of the engaging piece and the insertion recess each have a first engaging portion protruding in the radial direction of the yoke and a second engaging portion engaged with the first engaging portion to prevent the cover from sliding relative to the insulator in the axial direction of the yoke. The cover has an insertion plate extending in the axial direction of the yoke. The insulator inner walls, which are adjacent to each other, cooperate to have a pair of space-forming walls. One of the pair of space-forming walls is spaced from the other of the pair of space-forming walls in the circumferential direction of the yoke and cooperates with the other of the pair of space-forming walls to define an insertion space into which the insertion plate is inserted.The insert plate is configured to come into contact with the pair of space-forming walls when the insert plate is inserted into the insertion space.

[0009] Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, which illustrate by way of example the principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The invention, together with its objects and advantages, may best be understood by reference to the following description of the embodiments together with the accompanying drawings in which: Fig. 1 is a sectional view of an electric compressor according to an embodiment of the present invention; Fig. Figure 2 is a sectional view of a rotating electrical machine; Fig. 3 is an exploded perspective view of a stator core, a first insulator, and a second insulator; Fig. 4 is a perspective view of a stator without a first cover; Fig. 5 is a perspective view of the stator with the first cover attached to the first insulator; Fig. 6 is an enlarged perspective view of an insertion recess of a yoke and an engaging protruding portion; Fig. 7 is an enlarged perspective view of an insertion recess of the second insulator; Fig. Figure 8 is a perspective view of the stator without a second cover; Fig. 9 is a perspective view of the stator with the second cover attached to the second insulator; Fig. 10 is a fragmentary sectional view of the stator; Fig. Figure 11 is another fragmentary sectional view of the stator; Fig. 12 is an enlarged perspective view of an engaging piece of the first cover; Fig. 13 is a perspective view of the engaging piece and the insertion recess for explaining the relationship between the engaging piece and the insertion recess; Fig. 14 is a perspective view of an insert plate of the first cover; Fig. 15 is a sectional view of the insert plate, a space-forming wall, the engaging piece, and the insert recess for explaining the relationship between the insert plate, the space-forming wall, the engaging piece, and the insert recess; Fig. 16 is a perspective view of an insert plate and an engaging piece of the second cover; Fig. 17 is an enlarged perspective view of the insertion plate of the second cover and a protruding engagement portion; Fig. 18 is a sectional view of the engaging piece and the insertion recess for explaining the relationship between the engaging piece and the insertion recess; Fig. 19 is a sectional view of the insert plate, the space-forming wall, the engaging piece, and the insert recess for explaining the relationship between the insert plate, the space-forming wall, the engaging piece, and the insert recess; and Fig. 20 is a perspective view of an insert plate of a modification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] In the following, an embodiment of a stator of a rotating electrical machine is described with reference to the attached Fig. 1 to Fig. 19. The stator of the rotating electric machine according to the present embodiment serves as part of an electric compressor. The electric compressor is used, for example, for a vehicle air conditioner. Basic configuration of the electric compressor

[0012] Fig. Figure 1 illustrates an electric compressor 10 including a housing 11 having a cylindrical shape. The housing 11 includes an outlet housing 12, a motor housing 13, and an inverter housing 14. The outlet housing 12, the motor housing 13, and the inverter housing 14 are made of a metal material. For example, the outlet housing 12, the motor housing 13, and the inverter housing 14 are made of aluminum.

[0013] The motor housing 13 includes an end wall 13a and a peripheral wall 13b. The end wall 13a has a plate shape. The peripheral wall 13b has a cylindrical shape and extends from an outer peripheral portion of the end wall 13a. The outlet housing 12 has a cylindrical shape. The outlet housing 12 is connected to an end of the peripheral wall 13b remote from the end wall 13a. The inverter housing 14 has a cylindrical shape. The inverter housing 14 is connected to the end wall 13a of the motor housing 13. The end wall 13a of the motor housing 13 and the inverter housing 14 cooperate to define an inverter chamber S1.

[0014] The motor housing 13 has a protrusion 13c. The protrusion 13c has a circular cylindrical shape. The protrusion 13c protrudes from the center of an end surface of the end wall 13a toward the peripheral wall 13b. The axis of the protrusion 13c corresponds to the axis of the peripheral wall 13b of the motor housing 13. The end wall 13a of the motor housing 13 has a hole 13h. The hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction of the end wall 13a. The hole 13h is located between the protrusion 13c and the peripheral wall 13b.

[0015] The motor housing 13 has an intake port 13d. The intake port 13d is formed in a portion of the peripheral wall 13b adjacent to the end wall 13a. The inside and outside of the motor housing 13 are connected via the intake port 13d. A fluid, in particular a coolant, is introduced into the motor housing 13 through the intake port 13d from the outside of the motor housing 13.

[0016] The electric compressor 10 includes a rotating shaft 15, a compression part 16, an inverter 17, and a rotating electric machine 20. The rotating shaft 15, the compression part 16, and the rotating electric machine 20 are housed in the motor housing 13. That is, the housing 11 houses the rotating electric machine 20. The axis of the rotating shaft 15 housed in the motor housing 13 corresponds to the axis of the peripheral wall 13b of the motor housing 13. The inverter 17 is housed in the inverter chamber S1.

[0017] The compression part 16 and the rotating electric machine 20 are arranged side by side in the axial direction of the rotating shaft 15. The rotating electric machine 20 is located between the compression part 16 and the end wall 13a of the motor housing 13. The compression part 16, the rotating electric machine 20, and the inverter 17 are arranged in this order in the axial direction of the rotating shaft 15.

[0018] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is arranged between the compression part 16 and the rotating electric machine 20. Accordingly, the shaft support member 18 serves as a partition wall between the rotating electric machine 20 and the compression part 16. The shaft support member 18 cooperates with the end wall 13a and the peripheral wall 13b of the motor housing 13 to define a motor chamber S2. Accordingly, the housing 11 has the motor chamber S2. The motor chamber S2 accommodates the rotating electric machine 20. The coolant is introduced into the motor chamber S2 through the intake port 13d.

[0019] The shaft support member 18 has an insertion hole 18h. The insertion hole 18h is located at the center of the shaft support member 18. The axis of the insertion hole 18h corresponds to the axis of the projection 13c. A first end of the rotary shaft 15 is inserted through the insertion hole 18h. A radial bearing 19a is arranged between the insertion hole 18h and the first end of the rotary shaft 15. The first end of the rotary shaft 15 is rotatably supported by the shaft support member 18 via the radial bearing 19a. A second end of the rotary shaft 15 is inserted into the projection 13c. A radial bearing 19b is arranged between the projection 13c and the second end of the rotary shaft 15. The second end of the rotary shaft 15 is rotatably supported by the projection 13c via the radial bearing 19b.

[0020] The compression part 16 includes a fixed scroll 16a and a movable scroll 16b. The fixed scroll 16a is fixed to the motor housing 13. The movable scroll 16b is arranged facing the fixed scroll 16a. The compression part 16 is driven by rotation of the rotating shaft 15. The compression part 16 is configured to compress the coolant. The fixed scroll 16a and the movable scroll 16b cooperate to define a variable-volume compression chamber S3. The fixed scroll 16a and the discharge housing 12 cooperate to define a discharge chamber S4. The coolant is compressed by varying the volume of the compression chamber S3 and discharged into the discharge chamber S4. The rotary electric machine 20 is configured to rotate the rotating shaft 15. The rotation of the rotating shaft 15 drives the compression part 16. The rotation of the rotary shaft 15 therefore causes the compression part 16 to compress the coolant. Schematic configuration of the rotating electrical machine

[0021] The rotating electric machine 20 includes a rotor 21 and a stator 22. The stator 22 has a cylindrical shape. The rotor 21 is arranged within the stator 22. The rotor 21 includes a rotor core 21a having a circular cylindrical shape and a plurality of permanent magnets (not illustrated) arranged in the rotor core 21a. The rotor core 21a is fixed to the rotating shaft 15. The rotor core 21a is rotatable together with the rotating shaft 15. Stator core

[0022] The stator 22 includes a stator core 23. The stator core 23 is fixed to the inner peripheral surface of the peripheral wall 13b of the motor housing 13. The stator core 23 is fixed to the housing 11. For example, the stator core 23 is shrink-fitted into the inner peripheral surface of the peripheral wall 13b of the motor housing 13, so that the stator 22 is mounted to the housing 11. The axis of the stator core 23 corresponds to the axis of the rotating shaft 15. Accordingly, the axial direction of the stator core 23 corresponds to the axial direction of the rotating shaft 15.

[0023] As in the Fig. 2 and Fig. As illustrated in Figure 3, the stator core 23 includes a yoke 24 and a plurality of teeth 25. The yoke 24 has a circular cylindrical shape. The outer peripheral surface of the yoke 24 is fitted into the inner peripheral surface of the peripheral wall 13b of the motor housing 13, so that the stator core 23 is fixed to the motor housing 13. The axial direction of the yoke 24 corresponds to the axial direction of the stator core 23.

[0024] Each of the plurality of teeth 25 (i.e., one tooth 25) extends from an inner peripheral surface 24a of the yoke 24 inward in the radial direction of the yoke 24. The teeth 25 are spaced apart from each other (equally spaced apart in this embodiment) in the circumferential direction of the yoke 24. The circumferential direction of the yoke 24 corresponds to the circumferential direction of the stator core 23. Each of the teeth 25 (i.e., the tooth 25) extends from the inner peripheral surface 24a of the yoke 24 in the direction of the axis of the stator core 23. According to the present embodiment, the stator core 23 includes fifteen teeth 25. The number of teeth 25 is not limited to this, but the number of teeth 25 is a multiple of three.

[0025] As in Fig. As illustrated in Figure 3, the yoke 24 has flat end surfaces that define the yoke 24 in the axial direction of the yoke 24. Each tooth 25 has flat end surfaces that define the tooth 25 in the axial direction of the yoke 24. The length of the yoke 24 is equal to the length of the tooth 25 in the axial direction of the yoke 24. One end surface of the yoke 24 and one end surface of the tooth 25 lie in the same plane. The other end surface of the yoke 24 and the other end surface of the tooth 25 lie in the same plane.

[0026] One end surface of the yoke 24 and one end surface of the tooth 25 cooperate to form a first core end surface 23a of the stator core 23 at one end of the stator core 23 in the axial direction of the yoke 24. The other end surface of the yoke 24 and the other end surface of the tooth 25 cooperate to form a second core end surface 23b of the stator core 23 at another end of the stator core 23 in the axial direction of the yoke 24. Accordingly, the stator core 23 has the first core end surface 23a and the second core end surface 23b. The first core end surface 23a and the second core end surface 23b define the stator core 23 in the axial direction of the yoke 24, and each of the first core end surface 23a and the second core end surface 23b serves as the core end surface of the present invention.

[0027] As in Fig. 1, in the motor housing 13, the first core end surface 23a and the second core end surface 23b of the stator core 23 respectively face the shaft support member 18 and the end wall 13a of the motor housing 13 in the axial direction of the rotary shaft 15.

[0028] As in Fig. 2 and Fig. 3, the tooth 25 includes a tooth extension portion 26 and a tooth end portion 27. The tooth extension portion 26 has a thin plate shape and extends from the inner peripheral surface 24a of the yoke 24. The tooth extension portion 26 also extends from the first core end surface 23a to the second core end surface 23b of the stator core 23. The tooth extension portion 26 includes opposing tooth side surfaces 26a that define the tooth extension portion 26 in the circumferential direction of the yoke 24. Each of the tooth side surfaces 26a is continuous with the inner peripheral surface 24a of the yoke 24. The tooth end portion 27 extends from the tooth side surfaces 26a of the tooth extension portion along the circumferential direction of the yoke 24. The tooth end portion 27 extends from the distal end of the tooth extension portion 26 in opposite directions along the circumferential direction of the yoke 24.

[0029] The stator core 23 has a plurality of slots 30. Each of the slots 30 is formed between the teeth 25 that are adjacent to each other in the circumferential direction of the yoke 24. The slot 30 is defined by the inner peripheral surface 24a of the yoke 24, the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24, and a surface of the tooth end portion 27 that faces the yoke 24. The stator core 23 has a plurality of slot openings 31. Each of the slot openings 31 is formed between the tooth end portions 27 that are adjacent to each other in the circumferential direction of the yoke 24. The slot opening 31 is connected to the slot 30.

[0030] As in the Fig. 3, Fig. 4 and Fig. As illustrated in Figure 5, the yoke 24 has a plurality of insertion recesses 34. The insertion recesses 34 are formed in the outer peripheral surface of the yoke 24. Each of the insertion recesses 34 is opened at the first core end surface 23a of the stator core 23. The insertion recesses 34 are equally spaced from each other in the circumferential direction of the yoke 24 on the outer peripheral surface of the yoke 24. In this embodiment, for example, the yoke 24 has four insertion recesses 34.

[0031] As in Fig. 6, the insertion recess 34 is defined by a pair of side surfaces 34a, a connecting surface 34b, and a bottom surface 34c. The side surfaces 34a are opposite side surfaces of the insertion recess 34 in the circumferential direction of the yoke 24. The side surfaces 34a are continuous with the outer peripheral surface of the yoke 24. The side surfaces 34a are continuous with the first core end surface 23a. The side surfaces 34a extend from the first core end surface 23a in the axial direction of the yoke 24 and are parallel to each other. Each of the side surfaces 34a is defined by radially opposite edges (i.e., inner edge and outer edge) in the radial direction of the yoke 24, and the radially inner edge of one of the side surfaces 34a is connected to the radially inner edge of the other of the side surfaces 34a through the connecting surface 34b. The connecting surface 34b is continuous with the first core end surface 23a.Each of the side surfaces 34a is also defined by opposite edges in the axial direction of the yoke 24, and one of the edges of one side surface 34a, which is axially distant from the first core end surface 23a, is connected to one of the edges of the other side surface 34a, which is axially distant from the first core end surface 23a, by the bottom surface 34c. The connecting surface 34b is connected to the outer peripheral surface of the yoke 24 by the bottom surface 34c. The side surfaces 34a serve as the circumferential inner surfaces of the insertion recess 34, which define the insertion recess 34 in the circumferential direction of the yoke 24.

[0032] Each of the insertion recesses 34 has a first engagement portion, which in this embodiment is a protruding engagement portion 35. The protruding engagement portion 35 protrudes from the connecting surface 34b in the radial direction of the yoke 24. The protruding engagement portion 35 has a rectangular prism shape. In a plan view of the protruding engagement portion 35, the longitudinal direction of the protruding engagement portion 35 corresponds to the circumferential direction of the yoke 24. The protruding engagement portion 35 is located away from the bottom surface 34c. The protruding engagement portion 35 is also located away from the side surfaces 34a. insulator

[0033] As in Fig. As illustrated in Figure 3, the stator 22 includes a first insulator 50 serving as the insulator of the present invention. The first insulator 50 has a cylindrical shape. The stator 22 further includes a second insulator 60 serving as the insulator of the present invention. The second insulator 60 has a cylindrical shape. The first insulator 50 and the second insulator 60 are made of, for example, a resin material.

[0034] The first insulator 50 and the second insulator 60 each have an insulator base portion 51 and a plurality of insulator teeth 52. The insulator base portion 51 has a circular cylindrical shape. The first insulator 50 and the second insulator 60 are arranged on the stator core 23 and are each arranged such that the axis of the insulator base portion 51 corresponds to the axis of the yoke 24. Accordingly, the axial direction of the insulator base portion 51 corresponds to the axial direction of the yoke 24. The circumferential direction of the insulator base portion 51 corresponds to the circumferential direction of the yoke 24. The radial direction of the insulator base portion 51 corresponds to the radial direction of the yoke 24.

[0035] The first insulator 50 is arranged in contact with and facing the first core end surface 23a of the stator core 23. The second insulator 60 is arranged in contact with and facing the second core end surface 23b of the stator core 23. The outer diameter of the insulator base portion 51 is smaller than the outer diameter of the yoke 24. The insulator base portion 51 and the yoke 24 have the same inner diameter.

[0036] Each of the insulator teeth 52 extends from an inner peripheral surface 51a of the insulator base portion 51 inward in the radial direction of the insulator base portion 51. The insulator teeth 52 are spaced apart from each other (equally spaced apart in this embodiment) in the circumferential direction of the insulator base portion 51. Each of the insulator teeth 52 extends along the inner peripheral surface 51a of the insulator base portion 51 in the axial direction of the insulator base portion 51. In the present embodiment, the first insulator 50 and the second insulator 60 each have fifteen insulator teeth 52. The number of insulator teeth 52 is the same as the number of teeth 25 of the stator core 23.

[0037] Each of the insulator teeth 52 has an insulator extension portion 53. That is, the first insulator 50 and the second insulator 60 each have a plurality of insulator extension portions 53. Each of the insulator extension portions 53 has a columnar shape and extends from the inner peripheral surface 51a of the insulator base portion 51 inward in the radial direction of the insulator base portion 51. The insulator extension portion 53 and the tooth extension portion 26 have the same dimension in the circumferential direction of the insulator base portion 51 and the yoke 24. The insulator extension portions 53 are in contact with the teeth 25, respectively. Accordingly, each insulator extension portion 53 overlaps the corresponding tooth extension portion 26 in the axial direction of the yoke 24.

[0038] Each of the insulator teeth 52 has an insulator inner wall 54. That is, the first insulator 50 and the second insulator 60 each have a plurality of insulator inner walls 54. Each of the insulator inner walls 54 extends from the distal end of the insulator extension portion 53, which extends from the insulator base portion 51, along the direction of the insulator base portion 51. Specifically, the insulator inner wall 54 extends from the distal end of the insulator extension portion 53 in opposite directions along the circumferential direction of the insulator base portion 51 and extends in the axial direction of the insulator base portion 51 to be spaced apart from the stator core 23. In this way, the insulator inner wall 54 extends from the insulator extension portion 53. Each insulator inner wall 54 overlaps the corresponding tooth end portion 27 in the axial direction of the yoke 24.

[0039] Each of the insulator teeth 52 (i.e., the insulator tooth 52) extending from the insulator base portion 51 has a surface 52a at the distal end of the insulator teeth 52. The tooth 25 extending from the yoke 24 has a surface 25a at the distal end of the tooth 25. The surface 52a of the insulator tooth 52 and the surface 25a of the tooth 25 lie in the same plane. The surface 52a of the insulator tooth 52 is formed from a surface of the insulator inner wall 54 facing away from the insulator base portion 51. The surface 25a of the tooth 25 is formed from a surface of the tooth end portion 27 facing away from the yoke 24. The thickness of the insulator inner wall 54 is greater than the thickness of the tooth end portion 27. Accordingly, the insulator inner wall 54 closes the slot 30 at a region adjacent to the tooth end portion 27 in the axial direction of the yoke 24.

[0040] The insulator inner wall 54 has a plurality of insertion grooves 54a. Specifically, in this embodiment, the insulator inner wall 54 has two insertion grooves 54a in each of the opposite surfaces of the insulator inner wall 54 in the circumferential direction of the insulator base portion 51. Each of the insertion grooves 54a is formed through the insulator inner wall 54 in the axial direction of the insulator base portion 51. The insertion groove 54a forms a space serving as a part of a space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24.

[0041] The first insulator 50 has three guide grooves 55. The guide grooves 55 are arranged side by side in the axial direction of the first insulator 50. The guide grooves 55 are formed in the outer peripheral surface of the insulator base portion 51. The guide grooves 55 extend in the circumferential direction of the first insulator 50. The first insulator 50 has fifteen through grooves 56 corresponding to the three guide grooves 55. Specifically, the first insulator 50 has five through grooves 56 for each of the three guide grooves 55. The through grooves 56 are formed through the insulator base portion 51 in the radial direction.

[0042] The second insulator 60 has a plurality of insertion recesses 61. Each of the insertion recesses 61 is formed in the corresponding surface 52a of the insulator tooth 52. The insertion recess 61 is formed by the surface 52a of the insulator tooth 52 in the axial direction of the insulator base portion 51.

[0043] As in Fig. As illustrated in Figure 7, the insertion recess 61 is defined by a pair of side surfaces 61a, a first connecting surface 61b, a second connecting surface 61c, and a third connecting surface 61d. The side surfaces 61a serve as the circumferential inner surfaces of the insertion recess 61, defining the insertion recess 61 in the circumferential direction of the yoke 24. The side surfaces 61a extend in the axial direction of the yoke 24 and are parallel to each other. The first connecting surface 61b, the second connecting surface 61c, and the third connecting surface 61d connect the side surfaces 61a. The first connecting surface 61b and the second connecting surface 61c extend in the axial direction of the yoke 24. The second connecting surface 61c is located radially outside the first connecting surface 61b in the radial direction of the yoke 24. The second connecting surface 61c is located closer to the stator core 23 than the first connecting surface 61b.The third connecting surface 61d connects the first connecting surface 61b and the second connecting surface 61c. The third connecting surface 61d extends in the radial direction of the yoke 24. Sink

[0044] As in Fig. As illustrated in Figure 2, the stator 22 includes a plurality of coils 28. The coils 28 of the stator 22 each correspond to any one of the U-phase, the V-phase, and the W-phase. Accordingly, the stator 22 includes the plurality of coils 28 for a plurality of phases. Each of the coils 28 is formed by concentratedly winding a wire 29 around the stator core 23. The coil 28 partially passes through the slot 30.

[0045] As in the Fig. 4, Fig. 5, Fig. 8 and Fig. 9, the stator 22 includes a first coil end 32 and a second coil end 33. As shown in the Fig. 4 and Fig. 5, the first coil end 32 is a part of the coil 28 and protrudes from the first core end surface 23a. As shown in the Fig. 8 and Fig. As illustrated in FIG. 9, the second coil end 33 is a part of the coil 28 and protrudes from the second core end surface 23b. That is, each of the first coil end 32 and the second coil end 33 serves as a coil end that is a part of the coil 28 and protrudes from the core end surface. That is, the coil 28 is formed from the wire 29 wound around the stator core 23 and has a coil end that protrudes from the core end surface of the stator core 23, which defines the stator core 23 in the axial direction of the yoke 24.

[0046] As in the Fig. 4, Fig. 5, Fig. 8 and Fig. As illustrated in FIG. 9, the coils 28 of the same phase are connected to each other by series winding. In series winding, the wire 29 of each phase is wound around the 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 through the slots 30 by concentrated winding. The wire 29 of each phase is then repeatedly and sequentially wound around every third extension portion 26, 53 by concentrated winding in the same manner. This causes the coils 28 to be arranged every second in the circumferential direction of the stator core 23 for each phase. In the present embodiment, the coils 28 include five coils 28 for each of the U-phase, the V-phase, and the W-phase. The coils 28 are arranged such that the coils 28 of different phases are adjacent to each other in the circumferential direction of the stator core 23 in the slot 30.Accordingly, each of the coils 28 is formed from the wire 29 wound around the 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 through the slot 30.

[0047] As in the Fig. 4 and Fig. 5, the first insulator 50 electrically insulates the first core end face 23a from the coils 28. The insulator base portion 51 of the first insulator 50 is located outside the first coil ends 32 and overlaps the first coil ends 32 in the radial direction of the yoke 24. Each of the insulator inner walls 54 of the first insulator 50 is located inside the corresponding first coil end 32 and overlaps the first coil end 32 in the radial direction of the yoke 24. That is, the insulator inner wall 54 of the first insulator 50 is located inside the first coil end 32 in the radial direction of the yoke 24, so that the insulator inner wall 54 overlaps the tooth end portion 27 in the axial direction of the yoke 24 and overlaps the first coil end 32 in the radial direction of the yoke 24.

[0048] As in the Fig. 8 and Fig. 9, the second insulator 60 electrically insulates the second core end face 23b from the coils 28. The insulator base portion 51 of the second insulator 60 is located outside the second coil ends 33 and overlaps the second coil ends 33 in the radial direction of the yoke 24. Each of the insulator inner walls 54 of the second insulator 60 is located inside the corresponding second coil end 33 and overlaps the second coil end 33 in the radial direction of the yoke 24. That is, the insulator inner wall 54 of the second insulator 60 is located inside the second coil end 33 in the radial direction of the yoke 24, so that the insulator inner wall 54 overlaps the tooth end portion 27 in the axial direction of the yoke 24 and overlaps the second coil end 33 in the radial direction of the yoke 24.

[0049] As in Fig. 4, each wire 29 includes a connecting wire 57 for each phase, which connects the coils 28 of the same phase in the circumferential direction of the stator core 23. The connecting wire 57 is drawn out from the first coil end 32 of the coil 28 of the same phase and guided through the corresponding through groove 56 to the corresponding guide groove 55. Slot insulation element

[0050] As in Fig. 2, the stator 22 includes a plurality of slot insulating members 36. Each of the slot insulating members 36 serves as a first insulating member of the present invention. The slot insulating members 36 are each disposed in the corresponding one of the slots 30. Each of the slot insulating members 36 has a sheet shape. The slot insulating member 36 is formed by bending a strip-shaped insulating sheet so that the slot insulating member 36 extends along the inner peripheral surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24. The slot insulating member 36 is disposed in the slot 30 so that the longitudinal direction of the slot insulating member 36 is aligned with the axial direction of the yoke 24.The slot insulating member 36 extends between the first core end surface 23a and the second core end surface 23b of the stator core 23 and protrudes from both the first core end surface 23a and the second core end surface 23b along the axial direction. The slot insulating member 36 electrically insulates the stator core 23 from a portion of the corresponding coil 28 in the slot 30.

[0051] As in Fig. As illustrated in FIG. 10, the slot insulating member 36 includes an insulating body 37. The insulating body 37 is a part of the slot insulating member 36 that extends along the inner peripheral surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24. That is, the slot insulating member 36 extends along the inner peripheral surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24.

[0052] As in Fig. As illustrated in FIG. 11, the slot insulating member 36 further includes a pair of extension portions 38. Both ends of the insulating body 37 are located away from the inner peripheral surface 24a of the yoke 24, and the extension portions 38 respectively extend from both ends of the insulating body 37 so that the extension portions 38 approach each other. In other words, the extension portions 38 respectively extend from the tooth side surfaces 26a adjacent to each other in the circumferential direction of the yoke 24 so that the extension portions 38 approach each other. The extension portions 38 electrically insulate the tooth end portions 27, between which the slot opening 31 is arranged, from the corresponding coils 28. The extension portions 38 are separated from the tooth end portions 27. Insulating element

[0053] As in Fig. As illustrated in Figure 2, the stator 22 includes a plurality of insulating members 46. Each of the insulating members 46 serves as a second insulating member of the present invention. The insulating members 46 are each disposed in the corresponding one of the slots 30. Each of the insulating members 46 has a sheet shape. The insulating member 46 is formed by bending a strip-shaped insulating sheet. The insulating member 46 is disposed in the slot 30 such that the longitudinal direction of the insulating member 46 is aligned with the axial direction of the yoke 24.

[0054] As in Fig. 10 and Fig. 11, 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 of the insulating member 46 is disposed between one of the adjacent tooth end portions 27, between which the slot opening 31 is disposed, and one of the pair of extending portions 38 of the slot insulating member 36. The first insulating portion 47 of the insulating member 46 overlaps one of the extending portions 38 in the radial direction of the yoke 24. The first insulating portion 47 electrically insulates one of the adjacent tooth end portions 27 from one of the coils 28 adjacent to each other in the slot 30 in the circumferential direction of the yoke 24.

[0055] The second insulating portion 48 of the insulating member 46 is disposed between the other of the adjacent tooth end portions 27, between which the slot opening 31 is arranged, and the other of the pair of extending portions 38 of the slot insulating member 36. The second insulating portion 48 of the insulating member 46 overlaps the other of the extending portions 38 in the radial direction of the yoke 24. Accordingly, the insulating member 46 overlaps the extending portions 38 in the radial direction of the yoke 24. The second insulating portion 48 electrically insulates the other of the adjacent tooth end portions 27 from the other of the coils 28 that are adjacent to each other in the slot 30 in the circumferential direction of the yoke 24.

[0056] The third insulating portion 49 has a V-shape in cross section. Specifically, the third insulating portion 49 extends from one end of the first insulating portion 47 adjacent to the second insulating portion 48 toward the inner peripheral surface 24a of the yoke 24, and is bent toward the second insulating portion 48 and connected to one end of the second insulating portion 48 adjacent to the first insulating portion 47. Accordingly, the third insulating portion 49 connects the first insulating portion 47 and the second insulating portion 48. In the slot 30, the third insulating portion 49 is disposed between the coils 28 adjacent to each other in the circumferential direction of the yoke 24. The third insulating portion 49 electrically insulates one of the adjacent coils 28 from the other of the adjacent coils 28 in the slot 30.Accordingly, the third insulating portion 49 has a V-shape in cross section to connect the first insulating portion 47 and the second insulating portion 48 and to electrically insulate one of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 from the other of the adjacent coils 28 in the slot 30.

[0057] In this way, the insulating member 46 is arranged to cross the slot opening 31 in the circumferential direction of the yoke 24. The insulating member 46 electrically insulates the tooth end portions 27, between which the slot opening 31 is arranged, from the coils 28.

[0058] As in Fig. 4 and Fig. 8, the opposite ends of the insulating member 46 protrude in the longitudinal direction from the slot 30 in the axial direction of the yoke 24. As shown in Fig. 10, a part of the first insulating portion 47 and a part of the second insulating portion 48 of the insulating member 46, which protrude from the slot 30 in the axial direction of the yoke 24, are arranged in the space between the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24.

[0059] As in Fig. 10 and Fig. As illustrated in Figure 11, the insertion grooves 54a, which are adjacent to each other in the circumferential direction of the yoke 24, cooperate to form a part of the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24, and the first insulating portion 47 is inserted into one of the insertion grooves 54a. The second insulating portion 48 is inserted into the other of the insertion grooves 54a, which forms the part of the space between the insulator inner walls 54. In this way, the insulating member 46 protrudes from the slot 30 into the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. First cover

[0060] As in Fig. As illustrated in Figure 5, the stator 22 includes a first cover 65 serving as the cover of the present invention. The first cover 65 has a circular cylindrical shape. The first cover 65 has electrical insulating properties. The first cover 65 is made of, for example, a resin material. The first cover 65 faces the first insulator 50.

[0061] The first cover 65 has an end wall 65a, an outer peripheral wall 65b, and an inner peripheral wall 65c. The end wall 65a has a ring shape. The end wall 65a has a plate shape. The outer peripheral wall 65b has an edge 65e and has a circular cylindrical shape. The outer peripheral wall 65b extends from the outer peripheral portion of the end wall 65a and is defined by the end wall 65a and the edge 65e in the axial direction. The inner peripheral wall 65c has a circular cylindrical shape and extends 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 portion 51. The outer peripheral wall 65b surrounds the insulator base portion 51 of the first insulator 50. The inner peripheral wall 65c faces the insulator inner walls 54 of the first insulator 50 in the axial direction of the yoke 24.The end wall 65a faces the first coil ends 32 in the axial direction of the yoke 24. The end wall 65a has a plurality of insertion holes 65h.

[0062] As in Fig. As illustrated in Figure 1, the outer peripheral wall 65b of the first cover 65 is disposed between the connecting wire 57 and the peripheral wall 13b of the motor housing 13. The outer peripheral wall 65b of the first cover 65 electrically insulates the motor housing 13 from the connecting wire 57.

[0063] As in Fig. As illustrated in Figure 5, the first cover 65 includes a plurality of engaging pieces 66 having a plate shape. Each of the engaging pieces 66 extends from the edge 65e of the outer peripheral wall 65b of the first cover 65 in the axial direction of the yoke 24. The engaging piece 66 has circumferentially outer side edges 66a that define the engaging piece 66 in the circumferential direction of the yoke 24. The engaging pieces 66 are equally spaced from each other in the circumferential direction of the outer peripheral wall 65b of the first cover 65. The first cover 65 includes, for example, four engaging pieces 66.

[0064] As in Fig. As illustrated in Figure 12, each of the engagement pieces 66 includes a pair of engagement claws 67. Each of the engagement claws 67 includes an extension piece 67a and a hook piece 67b. The extension piece 67a has an elongated flat plate shape. The extension piece 67a extends from the edge 65e of the outer peripheral wall 65b of the first cover 65 in the axial direction of the yoke 24. The longitudinal direction of the extension piece 67a corresponds to the axial direction of the yoke 24. The extension pieces 67a are parallel to each other. The hook piece 67b of one of the engaging claws 67 extends from the distal end of the corresponding extension piece 67a toward the hook piece 67b of the other of the engaging claws 67. The distal end of one of the hook pieces 67b faces the distal end of the other of the hook pieces 67b in the circumferential direction of the yoke 24. The distal ends of the hook pieces 67b are spaced apart from each other.Each side edge 66a of the engaging piece 66 is formed from one of the side edges of each extension piece 67a.

[0065] As in Fig. As illustrated in FIG. 13, the engaging piece 66 is inserted into the corresponding insertion recess 34. The engaging piece 66 is inserted into the insertion recess 34 such that the protruding engaging portion 35 of the insertion recess 34 is located between the engaging claws 67. Accordingly, the engaging claws 67 are engaged with the protruding engaging portion 35. In this way, the first cover 65 is attached to the stator core 23. The engagement of the protruding engaging portion 35 and the hook piece 67b of each engaging claw 67 prevents the engaging piece 66 from coming out of the insertion recess 34. Accordingly, the engagement of the hook piece 67b of the engaging claw 67 and the engaging protruding portion 35 prevents the first cover 65 from shifting relative to the first insulator 50 in the axial direction of the yoke 24.The hook piece 67b of the engaging claw 67 serves as the second engaging portion of the present invention, which engages with the protruding engaging portion 35. That is, the engaging piece 66 includes the second engaging portion of the present invention, which engages with the protruding engaging portion 35, as the first engaging portion of the present invention.

[0066] As in Fig. 5 and Fig. 14, the first cover 65 includes a plurality of insert plates 68. Each of the insert plates 68 extends in the axial direction of the yoke 24 from the inner peripheral edge of the inner peripheral wall 65c of the first cover 65, which is the farthest one of the edges of the inner peripheral wall 65c from the end wall 65a. The insert plates 68 are equally spaced from each other in the circumferential direction of the inner peripheral wall 65c. Each of the insert plates 68 has an elongated plate shape. The longitudinal direction of the insert plate 68 corresponds to the axial direction of the yoke 24. The insert plate 68 has side edges that define the insert plate 68 in the circumferential direction of the yoke 24. The side edges of the insert plate 68 extend in the axial direction of the yoke 24 and are parallel to each other. The insert plate 68 is inserted into the space between the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24.Specifically, any two circumferentially adjacent insulator inner walls 54 of the first insulator 50 cooperate to include a pair of space-forming walls 59. One and the other of any two adjacent insulator inner walls 54 each include one and the other of the pair of space-forming walls 59. One of the pair of space-forming walls 59 is spaced from the other of the pair of space-forming walls 59 in the circumferential direction of the yoke 24 and cooperates with the other of the pair of space-forming walls 59 to define an insertion space 58 into which the insertion plate 68 is inserted. Accordingly, the insertion space 58 is the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. The pair of space-forming walls 59 are side walls of the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24.The insert plate 68 is not arranged in a space between the teeth 25 which are adjacent to each other in the circumferential direction of the yoke 24 and is arranged away from the stator core 23 in the axial direction of the yoke 24.

[0067] As in Fig. 15, the insertion plate 68 is configured to come into contact with the pair of space-forming walls 59 when the insertion plate 68 is inserted into the insertion space 58. In a situation where the insertion plate 68 contacts one of the pair of space-forming walls 59, a gap is formed between each of the side edges 66a of the engaging piece 66 and the corresponding circumferential inner surface (i.e., the side surface 34a) of the insertion recess 34 in the circumferential direction of the yoke 24. Accordingly, the insertion plate 68 comes into contact with one of the pair of space-forming walls 59 to prevent the first cover 65 from shifting relative to the first insulator 50 in the circumferential direction of the yoke 24. Second cover

[0068] As in Fig. As illustrated in Figure 9, the stator 22 includes a second cover 70 serving as a cover of the present invention. The second cover 70 has an approximately circular cylindrical shape. The second cover 70 has electrical insulating properties. The second cover 70 is made of, for example, a resin material. The second cover 70 is disposed on the opposite side of the second core end surface 23b with respect to the second coil end 33 in the axial direction of the yoke 24. The second cover 70 faces the second insulator 60.

[0069] The second cover 70 includes a main body 71 having a circular cylindrical shape and an extending wall 72 having a plate shape. The main body 71 faces the insulator inner walls 54 of the second insulator 60 in the axial direction of the yoke 24. The extending wall 72 extends outward from a portion of the outer peripheral edge of the main body 71 in the radial direction of the yoke 24. The extending wall 72 has a thin plate shape. The extending wall 72 includes a reservoir 73 having electrical insulating properties. The reservoir 73 has, for example, a rectangular cylindrical shape. The memory 73 stores a neutral point connector (not illustrated) serving as a neutral point at which the ends of lead wires 74 for the U-phase, the V-phase, and the W-phase drawn out from the second coil ends 33 are electrically connected to each other.

[0070] As in Fig. 9 and Fig. As illustrated in Figure 16, the second cover 70 includes a plurality of engaging pieces 75 having a plate shape. Each of the engaging pieces 75 extends from the inner peripheral edge of the main body 71 of the second cover 70 in the axial direction of the yoke 24. The engaging pieces 75 are evenly spaced from each other in the circumferential direction of the main body 71 on the main body 71 of the second cover 70.

[0071] As in Fig. As illustrated in Figure 17, each of the engagement pieces 75 has an elongated plate shape. The longitudinal direction of the engagement piece 75 corresponds to the axial direction of the main body 71. The engagement piece 75 has side edges 75a that define the engagement piece 75 in the circumferential direction of the main body 71 (ie, the circumferential direction of the yoke 24).

[0072] The side edges 75a of the engaging piece 75 extend in the axial direction of the main body 71 and are parallel to each other.

[0073] The engagement piece 75 has a first engagement portion, which in this embodiment is a protruding engagement portion 76. The engagement piece 75 has a radially outer surface in the radial direction of the main body 71, and the protruding engagement portion 76 extends from the radially outer surface to the distal end of the engagement piece 75 in the radial direction of the yoke 24. The protruding engagement portion 76 has an inclined surface 76a, which is a radially outer surface of the protruding engagement portion 76 in the radial direction of the main body 71. The inclined surface 76a is inclined inward in the radial direction of the main body 71 toward the distal end of the engagement piece 75.

[0074] As in Fig. As illustrated in Figure 18, each engaging piece 75 is inserted into the corresponding insertion recess 61 of the insulator inner wall 54 of the second insulator 60. This causes the protruding engaging portion 76 to extend over the first joint surface 61b of the insertion recess 61 and to be located on the second joint surface 61c of the insertion recess 61. The presence of the inclined surface 76a, which is the radially outer surface of the protruding engaging portion 76 in the radial direction of the main body 71, helps the protruding engaging portion 76 to extend over the first joint surface 61b. Furthermore, the engagement of the protruding engaging portion 76 and the third joint surface 61d of the insertion recess 61 prevents the engaging piece 75 from coming out of the insertion recess 61. In this way, the second cover 70 is attached to the second insulator 60.Accordingly, the engagement of the third connecting surface 61d of the insertion recess 61 and the protruding engagement portion 76 prevents the second cover 70 from shifting relative to the second insulator 60 in the axial direction of the yoke 24. The third connecting surface 61d of the insertion recess 61 serves as the second engagement portion of the present invention, which engages with the protruding engagement portion 76. That is, the insertion recess 61 includes the second engagement portion of the present invention, which engages with the protruding engagement portion 76, as the first engagement portion of the present invention.

[0075] In this way, the second cover 70 has the engagement piece 75, and the insulator inner wall 54 of the second insulator 60 has the insertion recess 61. The second cover 70 is attached to the second insulator 60, with the circumferential direction and the axial direction of the main body 71 corresponding to the circumferential direction and the axial direction of the yoke 24, respectively.

[0076] As in Fig. 16, the second cover 70 includes a plurality of insert plates 77. Each of the insert plates 77 extends in the axial direction of the yoke 24 from the inner peripheral edge of the main body 71 of the second cover 70. The insert plates 77 are equally spaced from each other in the circumferential direction of the main body 71 on the main body 71 of the second cover 70. Each of the insert plates 77 has an elongated plate shape. The longitudinal direction of the insert plate 77 corresponds to the axial direction of the yoke 24. The insert plate 77 has side edges that define the insert plate 77 in the circumferential direction of the yoke 24. The side edges of the insert plate 77 extend in the axial direction of the yoke 24 and are parallel to each other. The insert plate 77 is inserted into the space between the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24.Specifically, any two circumferentially adjacent insulator inner walls 54 of the second insulator 60 cooperate to include a pair of space-forming walls 63. One and the other of any two adjacent insulator inner walls 54 each include one and the other of the pair of space-forming walls 63. One of the pair of space-forming walls 63 is spaced from the other of the pair of space-forming walls 63 in the circumferential direction of the yoke 24 and cooperates with the other of the pair of space-forming walls 63 to define an insertion space 62 into which the insertion plate 77 is inserted. Accordingly, the insertion space 62 is the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. The pair of space-forming walls 63 are side walls of the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24.The insert plate 77 is not arranged in a space between the teeth 25 which are adjacent to each other in the circumferential direction of the yoke 24, and is arranged away from the stator core 23 in the axial direction of the yoke 24.

[0077] The second cover 70 has a plurality of insert plates 78. Each of the insert plates 78 extends in the axial direction of the yoke 24 from the inner peripheral edge of the main body 71 of the second cover 70. The insert plates 78 are equally spaced from each other in the circumferential direction of the main body 71 on the main body 71 of the second cover 70. Each of the insert plates 78 has an elongated plate shape. The longitudinal direction of the insert plate 78 corresponds to the axial direction of the yoke 24. The insert plate 78 has side edges that define the insert plate 78 in the circumferential direction of the yoke 24. The side edges of the insert plate 78 extend in the axial direction of the yoke 24 and are parallel to each other.

[0078] The insertion plate 78 is inserted into the insertion recess 61 into which the engaging piece 75 is not inserted. Specifically, the insertion plate 78 is inserted into an insertion space 80 defined by a pair of space-forming walls 81. The pair of space-forming walls 81 are spaced apart from each other in the circumferential direction of the yoke 24 and form the pair of side surfaces 61a of the insertion recesses 61 into which the engaging piece 75 is not inserted. Accordingly, any two circumferentially adjacent insulator inner walls 54 of the second insulator 60 cooperate to have the pair of space-forming walls 81. One and the other of any two adjacent insulator inner walls 54 each include one and the other of the pair of space-forming walls 81.One of the pair of space-forming walls 81 is spaced from the other of the pair of space-forming walls 81 in the circumferential direction of the yoke 24 and cooperates with the other of the pair of space-forming walls 81 to define the insertion space 80 into which the insertion plate 78 is inserted. The insertion plate 77 is not arranged in a space between the teeth 25 that are adjacent to each other in the circumferential direction of the yoke 24 and is arranged away from the stator core 23 in the axial direction of the yoke 24. The dimension of the insertion plate 78 is slightly larger than the dimension of the engagement piece 75 in the circumferential direction of the yoke 24.

[0079] In the main body 71 of the second cover 70, the engaging pieces 75, the inserting plates 77, and the inserting plates 78 are spaced from each other and arranged in the order of the engaging piece 75, the inserting plate 77, the inserting plate 78, the inserting plate 77, the inserting plate 78, the inserting plate 77, and the engaging piece 75 repeatedly in the circumferential direction of the main body 71.

[0080] As in Fig. 19, the insertion plate 77 is configured to come into contact with the pair of space-forming walls 63 when the insertion plate 77 is inserted into the insertion space 62. The insertion plate 78 is configured to come into contact with the pair of space-forming walls 81 when the insertion plate 78 is inserted into the insertion recess 61. In a situation where the insertion plate 77 and the insertion plate 78 are each in contact with one of the pair of space-forming walls 63 and one of the pair of space-forming walls 81, a gap is formed between each of the side edges 75a of the engaging piece 75 and its corresponding circumferential inner surface (i.e., the side surface 61a) of the insertion recess 61 in the circumferential direction of the yoke 24.Accordingly, the insert plate 77 and the insert plate 78 each come into contact with one of the pair of space-forming walls 63 and one of the pair of space-forming walls 81 to prevent the second cover 70 from shifting relative to the second insulator 60 in the circumferential direction of the yoke 24. Support surface

[0081] As in Fig. 10 and Fig. 11, the insert plate 68 and the insert plate 77 each have a support surface 85 located in the space between the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24, and located inside the insulating member 46 to support the insulating member 46 in the radial direction of the yoke 24. The support surface 85 of each of the insert plate 68 and the insert plate 77 is a radially outer surface of each of the insert plate 68 and the insert plate 77 in the radial direction of the yoke 24. As shown in Fig. As illustrated in Figure 11, the support surface 85 is located radially outside the slot opening 31 in the radial direction of the yoke 24 when viewed in the axial direction of the yoke 24. The support surface 85 of each of the insert plate 68 and the insert plate 77 supports a part of the first insulating portion 47 and a part of the second insulating portion 48, which protrudes from the slot 30 in the axial direction of the yoke 24, at a position adjacent to the third insulating portion 49. holding section

[0082] The insert plate 68 and the insert plate 77 each have a holding portion 86. The holding portion 86 of the insert plate 68 protrudes outward in the radial direction of the yoke 24 from a central part of a radially outer surface of the insert plate 68. The holding portion 86 of the insert plate 77 protrudes outward in the radial direction of the yoke 24 from a central part of a radially outer surface of the insert plate 77. The holding portion 86 of the insert plate 68 is formed integrally with the insert plate 68. The holding portion 86 of the insert plate 77 is formed integrally with the insert plate 77. Each holding 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 holding portion 86 is in contact with the opposite end portions of the third insulating portion 49 adjacent to the first insulating portion 47 and the second insulating portion 48, respectively.The insulating member 46 has the first connection point 46a and the second connection point 46b. The third insulating portion 49 is connected to the first insulating portion 47 at the first connection point 46a and to the second insulating portion 48 at the second connection point 46b. The holding portion 86 secures an opening angle of the third insulating portion 49, thereby ensuring a distance between the first connection point 46a and the second connection point 46b in the circumferential direction of the yoke 24. Hermetic connection

[0083] As in Fig. 1, the electric compressor 10 includes a hermetic terminal 40. The hermetic terminal 40 has three conductive elements 41 connected to the coils 28 of the U-phase, the V-phase, and the W-phase. That is, the electric compressor 10 includes the conductive elements 41. For the sake of explanation, Fig. 1 shows only one of the conductive elements 41. Each of the conductive elements 41 is a cylindrical metal terminal that extends linearly. A first end of the conductive element 41 is electrically connected to the inverter 17 in the inverter chamber S1. A second end of the conductive element 41 protrudes from the inverter chamber S1 through the hole 13h into the motor housing 13. The hermetic terminal 40 includes a support plate 42. The support plate 42 supports the three conductive elements 41, with the conductive elements 41 being electrically insulated from each other. The support plate 42 is arranged on the outer surface of the end wall 13a of the motor housing 13 in the inverter chamber S1 and fixed near the hole 13h.

[0084] The stator 22 includes three lead wires 43, each for the U-phase, the V-phase, and the W-phase. The lead wires 43 are drawn out of the rotating electrical machine 20. In this embodiment, each of the lead wires 43 is drawn out of the second coil end 33 of any one of the coils 28 of the corresponding phase. For the sake of explanation, Fig. 1 only one of the three supply wires 43.

[0085] The stator 22 includes a cluster block 44. The cluster block 44 accommodates three connection terminals 45. The cluster block 44 has electrical insulation properties. The cluster block 44 is made of, for example, a resin material. The cluster block 44 accommodates three connection terminals 45 for the U-phase, the V-phase, and the W-phase. Each of the conductive elements 41 is electrically connected to the corresponding lead wire 43 via the corresponding connection terminal 45.

[0086] The inverter 17 supplies power to the rotating electrical machine 20 via the conductive elements 41, the connecting terminals 45, and the lead wires 43. Accordingly, the rotating electrical machine 20 is driven. In other words, the inverter 17 drives the rotating electrical machine 20.

[0087] As in Fig. As illustrated in Figure 9, the extending wall 72 of the second cover 70 holds the three lead wires 43 while pressing the lead wires 43 against the second coil ends 33. This allows the cluster block 44 to be aligned with the stator core 23. Operation

[0088] The operation of the stator of the rotating electric machine according to the present embodiment will be described below.

[0089] For example, when the rotating electrical machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate 68 in the insertion space 58 and one of the pair of space-forming walls 59. The occurrence of friction between the insertion plate 68 and one of the pair of space-forming walls 59 suppresses the friction between the engagement piece 66 and the insertion recess 34 in the axial direction of the yoke 24. Specifically, in a situation where the insertion plate 68 is in contact with one of the pair of space-forming walls 59, a gap is formed between each of the circumferential side edges 66a of the engagement piece 66 and the circumferential inner surface (ie, the corresponding side surface 34a) of the insertion recess 34 in the circumferential direction of the yoke 24. This configuration prevents the occurrence of friction between the side edge 66a of the engaging piece 66 and the corresponding side surface 34a of the insertion recess 34.This therefore suppresses the progression of friction between the engaging piece 66 and the insertion recess 34. This therefore prevents breakage of the engaging piece 66, thereby preventing disengagement of the protruding engaging portion 35 and the hook piece 67b of the engaging claw 67. This therefore prevents the first cover 65 from coming out of the first insulator 50 in the axial direction of the yoke 24.

[0090] Similarly, when the rotating electrical machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate 77 in the insertion space 62 and one of the pair of space-forming walls 63, and between the insertion plate 78 in the insertion space 80 and one of the pair of space-forming walls 81. The occurrence of friction between the insertion plate 77 in the insertion space 62 and one of the pair of space-forming walls 63, and between the insertion plate 78 in the insertion space 80 and one of the pair of space-forming walls 81 suppresses the friction between the engagement piece 75 and the insertion recess 61 in the axial direction of the yoke 24.Specifically, in a situation where the insertion plate 77 and the insertion plate 78 are each in contact with one of the pair of space-forming walls 63 and one of the pair of space-forming walls 81, a gap is formed between each of the circumferential side edges 75a of the engaging piece 75 and the circumferential inner surface (ie, the corresponding side surface 61a) of the insertion recess 61 in the circumferential direction of the yoke 24. This configuration prevents the occurrence of friction between the side edge 75a of the engaging piece 75 and the corresponding side surface 61a of the insertion recess 61. This therefore suppresses the progress of friction between the engaging piece 75 and the insertion recess 61. This therefore prevents breakage of the engaging piece 75, thereby preventing detachment of the protruding engaging portion 76 and the third connecting surface 61d of the insertion recess 61.This therefore prevents the second cover 70 from coming out of the second insulator 60 in the axial direction of the yoke 24.

[0091] The insert plate 68 and the insert plate 77 each have a support surface 85 located in the space between the insulator inner walls 54, which are adjacent to each other in the circumferential direction of the yoke 24, and located inside the insulating member 46 to support the insulating member 46 in the radial direction of the yoke 24. The support surface 85 is located radially outside the slot opening 31, which is arranged between the tooth end portions 27, in the radial direction of the yoke 24 when viewed in the axial direction of the yoke 24. This configuration prevents the insulating member 46 from approaching the slot opening 31. This configuration therefore easily ensures an insulating distance between the tooth end portions 27 and the coils 28. Beneficial effects

[0092] The above embodiment provides the following advantageous effects. The following (1) to (3) focus on advantageous effects related to the second cover 70 and will not elaborate on advantageous effects related to the first cover 65, since they are the same as the advantageous effects related to the second cover 70. (1) The second cover 70 includes the insertion plate 77 and the insertion plate 78 extending in the axial direction of the yoke 24. Any two circumferentially adjacent insulator inner walls 54 of the second insulator 60 cooperate to include the pair of space-forming walls 63. One and the other of any two adjacent insulator inner walls 54 each include one and the other of the pair of space-forming walls 63. One of the pair of space-forming walls 63 is spaced from the other of the pair of space-forming walls 63 in the circumferential direction of the yoke 24 and cooperates with the other of the pair of space-forming walls 63 to define the insertion space 62 into which the insertion plate 77 is inserted. Furthermore, any two circumferentially adjacent insulator inner walls 54 of the second insulator 60 cooperate to have the pair of space-forming walls 81.One and the other of any two adjacent insulator inner walls 54 respectively include one and the other of the pair of space-forming walls 81. One of the pair of space-forming walls 81 is spaced from the other of the pair of space-forming walls 81 in the circumferential direction of the yoke 24 and cooperates with the other of the pair of space-forming walls 81 to define the insertion space 80 into which the insertion plate 78 is inserted. The insertion plate 77 is configured to come into contact with the pair of space-forming walls 63 when the insertion plate 77 is inserted into the insertion space 62. The insertion plate 78 is configured to come into contact with the pair of space-forming walls 81 when the insertion plate 78 is inserted into the insertion space 80.For example, when the rotating electrical machine 20 vibrates, friction occurs in the axial direction of the yoke 24 between the insertion plate 77 in the insertion space 62 and one of the pair of space-forming walls 63 and between the insertion plate 78 in the insertion space 80 and one of the pair of space-forming walls 81. The occurrence of friction between the insertion plate 77 in the insertion space 62 and one of the pair of space-forming walls 63 and between the insertion plate 78 in the insertion space 80 and one of the pair of space-forming walls 81 suppresses the friction between the engaging piece 75 and the insertion recess 61 in the axial direction of the yoke 24. This therefore suppresses the progress of the friction between the engaging piece 75 and the insertion recess 61. This therefore prevents breakage of the engaging piece 75, thereby preventing detachment of the protruding engaging portion 76 and the third connecting surface 61d of the insertion recess 61.This prevents the second cover 70 from coming out of the second insulator 60 in the axial direction of the yoke 24. As a result, this increases the reliability of the stator 22 of the rotating electrical machine 20. (2) In a situation where the insertion plate 77 and the insertion plate 78 are each in contact with one of the pair of space-forming walls 63 and one of the pair of space-forming walls 81, a gap is formed between each of the circumferential side edges 75a of the engaging piece 75 and the circumferential inner surface (ie, the corresponding side surface 61a) of the insertion recess 61 in the circumferential direction of the yoke 24. This configuration prevents the occurrence of friction between the side edge 75a of the engaging piece 75 and the corresponding side surface 61a of the insertion recess 61. (3) The insertion space 62 is a space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. The pair of space-forming walls 63 are side walls of the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. This configuration allows the progression of friction between the engagement piece 75 and the insertion recess 61 to be suppressed simply by the presence of the insertion plate 77 inserted into the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24. This therefore simplifies the configuration of the stator 22. (4) The second cover 70 has the engaging piece 75, and the insulator inner wall 54 of the second insulator 60 has the insertion recess 61. The insertion plate 77, the pair of space-forming walls 63, the engaging piece 75, and the insertion recess 61 are located radially inward of the second coil end 33 in the radial direction of the yoke 24. This configuration allows the engaging piece 75 and the insertion recess 61 to be located as close as possible to the insertion plate 77 and the pair of space-forming walls 63, compared to a configuration in which the engaging piece 75 and the insertion recess 61 are located radially outward of the second coil end 33 in the radial direction of the yoke 24. This configuration is unlikely to cause tolerance accumulation of the engaging piece 75, the insertion recess 61, the insertion plate 77, and the pair of space-forming walls 63.This configuration therefore appropriately suppresses friction between the engaging piece 75 and the insertion recess 61 caused by friction between the insertion plate 77 and the space-forming wall 63. (5) The insert plate 68 and the insert plate 77 each have the support surface 85 located in the space between the insulator inner walls 54 that are adjacent to each other in the circumferential direction of the yoke 24 and located inside the insulating member 46 to support the insulating member 46 in the radial direction of the yoke 24. The support surface 85 is located radially outside the slot opening 31 arranged between the tooth end portions 27 in the radial direction of the yoke 24 when viewed in the axial direction of the yoke 24. This configuration prevents the insulating member 46 from approaching the slot opening 31. This configuration therefore easily ensures an insulating distance between the coils 28 and the tooth end portions 27 between which the slot opening 31 is arranged.This configuration therefore suppresses the occurrence of electrical insulation failures between the tooth end portions 27 and the coils 28, thereby increasing the reliability of the stator 22 of the rotating electrical machine 20. (6) The insulating member 46 overlaps the extending portions 38 of the slot insulating member 36 in the radial direction of the yoke 24. This configuration easily allows the insulating distance between the tooth end portions 27 and the coils 28 to be widened, compared with a configuration in which the slot insulating member 36 does not have extending portions 38. Therefore, this configuration further suppresses the occurrence of electrical insulation failures between the tooth end portions 27 and the coils 28, thereby further increasing the reliability of the stator 22 of the rotating electrical machine 20. (7) The insulating member 46 has the first connection point 46a and the second connection point 46b. The third insulating portion 49 is connected to the first insulating portion 47 at the first connection point 46a and to the second insulating portion 48 at the second connection point 46b. The insert plate 68 and the insert plate 77 each have the holding portion 86 that secures an opening angle of the third insulating portion 49. The holding portion 86 therefore secures a distance between the first connection point 46a and the second connection point 46b in the circumferential direction of the yoke 24.This configuration allows the distance between the slot opening 31 and the distal edge of the first insulating portion 47 extending from the third insulating portion 49, and the distance between the slot opening 31 and the distal edge of the second insulating portion 48 extending from the third insulating portion 49, to be extended as much as possible. This configuration therefore easily allows the insulation distance between the tooth end portions 27 and the coils 28 to be extended. This configuration therefore further suppresses the occurrence of electrical insulation failures between the tooth end portions 27 and the coils 28, thereby further increasing the reliability of the stator 22 of the rotating electrical machine 20. (8) Each of the insert plate 68 and the insert plate 77 is not arranged in a space between the teeth 25 that are adjacent to each other in the circumferential direction of the yoke 24, and is arranged away from the stator core 23 in the axial direction of the yoke 24. In this configuration, the support surface 85 of each of the insert plate 68 and the insert plate 77 is located inside the insulating member 46 to support only a part of the insulating member 46 that protrudes from the slot 30 into a space between the circumferentially adjacent insulator inner walls 54. The insert plate 68 and the insert plate 77 are located away from the stator core 23. This configuration prevents contact and therefore prevents friction between the insert plates 68 and 77 and the stator core 23, for example, when the rotating electrical machine 20 vibrates.This configuration therefore increases the durability of the stator 22 of the rotating electrical machine 20, thereby further increasing the reliability of the stator 22 of the rotating electrical machine 20. Modifications

[0093] The above embodiment may be modified as follows. The embodiment and the following modifications may be combined within a technically consistent range. ◯ As in Fig.20, for example, the insertion plate 77 can be inserted into the space between the adjacent teeth 25 in the circumferential direction of the yoke 24 through the space between the adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. According to this configuration, the support surface 85 of the insertion plate 77 is located inside the insulating member 46 to support a part of the insulating member 46 located in the slot 30, in addition to the part of the insulating member 46 protruding into a space between the circumferentially adjacent insulator inner walls 54. Accordingly, the support surface 85 of the insertion plate 77 is located inside the insulating member 46 to stably support the insulating member 46 in the radial direction of the yoke 24. This configuration therefore further prevents the insulating member 46 from approaching the slot opening 31.This configuration therefore easily ensures the insulation distance between the coils 28 and the tooth end portions 27, between which the slot opening 31 is arranged. This configuration therefore further suppresses the occurrence of electrical insulation failures between the tooth end portions 27 and the coils 28, thereby further increasing the reliability of the stator 22 of the rotating electrical machine 20. ◯ In the present embodiment, the second cover 70 may be provided without the plurality of insertion plates 78. ◯ In the present embodiment, the second cover 70 may be provided without the plurality of insertion plates 77. ◯ In the present embodiment, for example, each of the insulator inner walls 54 of the second insulator 60 may have an engaging piece, and the second cover 70 may have an insertion recess into which the engaging piece is inserted. That is, in this configuration, one of the cover and the insulator inner wall 54 must have an engaging piece, and the other of the cover and the insulator inner wall 54 must have an insertion recess into which the engaging piece is inserted. In the present embodiment, the insulator inner wall 54 of the second insulator 60 may be provided without the insertion recess 61. In this configuration, the insulator base portion 51 of the second insulator 60 may, for example, have an insertion recess. In this configuration, the engaging piece 75 extends outward from the main body 71 in the radial direction of the main body 71, so that the engaging piece 75 is inserted into an insertion recess formed in the insulator base portion 51 of the second insulator 60. ◯ In the present embodiment, for example, the second insulator 60 may include an engaging piece having a plate shape, and the second cover 70 may include an insertion recess into which the engaging piece is inserted. That is, one of the cover and the insulator must include an engaging piece having a plate shape, and the other of the cover and the insulator must include an insertion recess into which the engaging piece is inserted. ◯ In the present embodiment, for example, the yoke 24 may have an engagement piece having a plate shape, and the first cover 65 may have an insertion recess into which the engagement piece is inserted. That is, one of the cover and the yoke 24 must have an engagement piece having a plate shape, and the other of the cover and the yoke 24 must have an insertion recess into which the engagement piece is inserted. That is, one of the cover and the insulator must have an engagement piece having a plate shape, and the other of the cover and the insulator must have an insertion recess into which the engagement piece is inserted, or one of the cover and the yoke must have an engagement piece having a plate shape, and the other of the cover and the yoke must have an insertion recess into which the engagement piece is inserted.In this configuration, one of the engaging piece and the insertion recess must have a protruding engagement portion as the first engagement portion, and the other of the engaging piece and the insertion recess must have the second engagement portion. The second engagement portion of the other of the engaging piece and the insertion recess may be a protrusion or a recess. ◯ In the present embodiment, the engaging pieces 66 may not be evenly spaced from each other in the circumferential direction. The same applies to the engaging pieces 75, the insertion recesses 34, and the insertion recesses 61. In the present embodiment, the insert plates 68 may not be evenly spaced from each other in the circumferential direction. The same applies to the insert plates 77 and the insert plates 78. ◯ In the present embodiment, each insert plate 68 and each insert plate 77 may be provided without the support surface 85. ◯ In the present embodiment, each slot insulating member 36 may be provided without the pair of extending portions 38. ◯ In the present embodiment, the slot insulating member 36 may be a resin layer formed integrally with the inner peripheral surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24. ◯ In the present embodiment, the insulating member 46 includes the first insulating portion 47, the second insulating portion 48, and the third insulating portion 49, and has a V-shape in cross section. However, the shape of the insulating member 46 is not limited to this. The insulating member 46 may have a flat plate shape such that the insulating member 46 is disposed in the slot 30 and crosses the slot opening 31 in the circumferential direction of the yoke 24. The insulating member 46 having a flat plate shape electrically insulates the tooth end portions 27, between which the slot opening 31 is disposed, from the coils 28. That is, the insulating member 46 must electrically insulate the tooth end portions 27 from the coils 28, but the shape of the insulating member 46 is not particularly limited. ◯ In the present embodiment, the insulating member 46 is formed from a flexible insulating sheet, but this is not limited to this. The insulating member 46 may, for example, be formed from a molded member. ◯ In the present embodiment, each of the insertion plate 68 and the insertion plate 77 may be provided without the holding portion 86. ◯ In the present embodiment, the compression member 16 is not limited to a scroll compression member. The compression member 16 may be a compression member such as a piston compression member or a vane compression member. In the present embodiment, the electric compressor 10 is applicable to, but not limited to, a vehicle air conditioner. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and is configured to cause the compression part 16 to compress air as a fluid supplied to a fuel cell. Attachment

[0094] The above embodiment includes configurations described in the following appendices. Appendix 1

[0095] Stator of a rotating electrical machine, the stator comprising: a stator core including a yoke having a cylindrical shape and a core end surface defining the stator core in an axial direction of the yoke, the stator core including a plurality of teeth each extending from an inner peripheral surface of the yoke inward in a radial direction of the yoke, each of the plurality of teeth having: a tooth extension portion extending from the inner peripheral surface of the yoke and having tooth side surfaces defining the tooth extension portion in a circumferential direction of the yoke; and a tooth end portion extending from the tooth side surfaces of the tooth extending portion along the circumferential direction of the yoke; a coil formed of a wire wound around the stator core, the coil having a coil end protruding from the core end surface of the stator core; an insulator facing the core end face of the stator core and electrically insulating the core end face from the coil end, the insulator comprising: an insulator base portion having a cylindrical shape and disposed outside the coil end and overlapping the coil end in the radial direction of the yoke; a plurality of insulator extension portions each extending inwardly from an inner peripheral surface of the insulator base portion in a radial direction of the insulator base portion and overlapping the corresponding tooth extension portion in the axial direction of the yoke; and a plurality of insulator inner walls each extending from the corresponding insulator extension portion, each of the insulator inner walls being disposed in the radial direction of the yoke inside the coil end such that the insulator inner wall overlaps the corresponding tooth end portion in the axial direction of the yoke and overlaps the coil end in the radial direction of the yoke; and a cover facing the insulator, one of the cover and the insulator each having an engagement piece having a plate shape and extending in the axial direction, and an insertion recess into which the engagement piece is inserted, or one of the cover and the yoke each having the engagement piece and the insertion recess, one of the engagement piece and the insertion recess each having a first engagement portion protruding in the radial direction of the yoke and a second engagement portion engaged with the first engagement portion to prevent the cover from shifting relative to the insulator in the axial direction of the yoke, where the cover has an insert plate extending in the axial direction of the yoke, the insulator inner walls, which are adjacent to one another, cooperate to have a pair of space-forming walls, one of the pair of space-forming walls being spaced from the other of the pair of space-forming walls in the circumferential direction of the yoke and cooperating with the other of the pair of space-forming walls to define an insertion space into which the insertion plate is inserted, and the insert plate is configured to come into contact with the pair of space-forming walls when the insert plate is inserted into the insertion space. Appendix 2

[0096] Stator of the rotating electrical machine according to Annex 1, where the engaging piece has side edges defining the engaging piece in the circumferential direction of the yoke, and the insertion recess has inner surfaces defining the insertion recess in the circumferential direction of the yoke, and in a situation where the insertion plate is in contact with one of the pair of space-forming walls, a gap is formed between each of the side edges of the engaging piece and the corresponding inner surface of the insertion recess. Appendix 3

[0097] Stator of the rotating electrical machine according to Annex 1 or 2, where the insertion space is a space between the insulator inner walls that adjoin each other in the circumferential direction of the yoke, and the pair of space-forming walls are side walls of the insulator inner walls which are adjacent to each other in the circumferential direction of the yoke. Appendix 4

[0098] Stator of the rotating electrical machine according to one of Annexes 1 to 3, wherein one of the cover and each of the insulator inner walls has the engagement piece, and the other of the cover and each of the insulator inner walls has the insertion recess. Appendix 5

[0099] Stator of the rotating electrical machine according to Annex 3, where the stator core has a slot between the teeth that are adjacent to each other in the circumferential direction of the yoke, the coil is formed from the wire wound around the tooth extension portion and the insulator extension portion through the slot, the stator contains: a first insulating member extending along an inner peripheral surface of the yoke and the tooth side surfaces adjacent to each other in the circumferential direction of the yoke, and electrically insulating the stator core from the coil in the slot; and a second insulating member arranged to cross a slot opening between the tooth end portions adjacent to each other in the circumferential direction of the yoke and electrically insulate the tooth end portions from the coil, the insert plate has a support surface located in the space between the insulator inner walls adjacent to each other in the circumferential direction of the yoke and located within the second insulating member to support the second insulating member in the radial direction of the yoke, and the support surface is located outside the slot opening in the radial direction of the yoke when viewed in the axial direction of the yoke. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2022-150980

[0002]

Claims

[1] Stator (22) of a rotating electrical machine (10), the stator (22) comprising: a stator core (23) including a yoke (24) having a cylindrical shape and a core end surface (23a, 23b) defining the stator core (23) in an axial direction of the yoke (24), wherein the stator core (23) includes a plurality of teeth (25) each extending inwardly from an inner peripheral surface (24a) of the yoke (24) in a radial direction of the yoke (24), each of the plurality of teeth (25) having: a tooth extension portion (26) extending from the inner peripheral surface (24a) of the yoke (24) and having tooth side surfaces (26a) defining the tooth extension portion (26) in a circumferential direction of the yoke (24); and a tooth end portion (27) extending from the tooth side surfaces (26a) of the tooth extension portion (26) along the circumferential direction of the yoke (24); a coil (28) formed from a wire (29) wound around the stator core (23), the coil (28) having a coil end (32, 33) protruding from the core end surface (23a, 23b) of the stator core (23); an insulator (50, 60) facing the core end surface (23a, 23b) of the stator core (23) and electrically insulating the core end surface (23a, 23b) from the coil end (32, 33), the insulator (50, 60) comprising: an insulator base portion (51) having a cylindrical shape and disposed outside the coil end (32, 33) and overlapping the coil end (32, 33) in the radial direction of the yoke (24); a plurality of insulator extension portions (53) each extending inwardly from an inner peripheral surface (51a) of the insulator base portion (51) in a radial direction of the insulator base portion (51) and overlapping the corresponding tooth extension portion (26) in the axial direction of the yoke (24); and a plurality of insulator inner walls (54) each extending from the corresponding insulator extension portion (53), each of the insulator inner walls (54) being arranged in the radial direction of the yoke (24) inside the coil end (32, 33) such that the insulator inner wall (54) overlaps the corresponding tooth end portion (27) in the axial direction of the yoke (24) and overlaps the coil end (32, 33) in the radial direction of the yoke (24); and a cover (65, 70) facing the insulator (50, 60), one and the other of the cover (65, 70) and the insulator (50, 60) each having an engagement piece (66, 75) having a plate shape and extending in the axial direction, and an insertion recess (34, 61) into which the engagement piece (66, 75) is inserted, or one and the other of the cover (65, 70) and the yoke (24) each having the engagement piece (66, 75) and the insertion recess (34, 61), one and the other of the engagement piece (66, 75) and the insertion recess (34, 61) each having a first engagement portion (35, 76) projecting in the radial direction of the yoke (24), and a a second engagement portion (61d, 67b) engaged with the first engagement portion (35, 76) to prevent the cover (65, 70) from shifting relative to the insulator (50, 60) in the axial direction of the yoke (24), characterized by, that the cover (65, 70) has an insert plate (68, 77, 78) extending in the axial direction of the yoke (24), the insulator inner walls (54) which are adjacent to each other cooperate to have a pair of space-forming walls (59, 63, 81), wherein one of the pair of space-forming walls (59, 63, 81) is spaced from the other of the pair of space-forming walls (59, 63, 81) in the circumferential direction of the yoke (24) and cooperates with the other of the pair of space-forming walls (59, 63, 81) to define an insertion space (58, 62, 80) into which the insertion plate (68, 77, 78) is inserted, and the insertion plate (68, 77, 78) is configured to come into contact with the pair of space-forming walls (59, 63, 81) when the insertion plate (68, 77, 78) is inserted into the insertion space (58, 62, 80). [2] Stator (22) of the rotating electrical machine (10) according to claim 1, characterized by , that the engaging piece (66, 75) has side edges (66a, 75a) defining the engaging piece (66, 75) in the circumferential direction of the yoke (24), and the insertion recess (34, 61) has inner surfaces (34a, 61a) defining the insertion recess (34, 61) in the circumferential direction of the yoke (24), and in a situation where the insertion plate (68, 77, 78) is in contact with one of the pair of space-forming walls (59, 63, 81), a space is formed between each of the side edges (66a, 75a) of the engaging piece (66, 75) and the corresponding inner surface (34a, 61a) of the insertion recess (34, 61). [3] Stator (22) of the rotating electrical machine (10) according to claim 1 or 2, characterized by , that the insertion space (58, 62) is a space between the insulator inner walls (54) which adjoin one another in the circumferential direction of the yoke (24), and the pair of space-forming walls (59, 63) are side walls of the insulator inner walls (54) which are adjacent to one another in the circumferential direction of the yoke (24). [4] Stator (22) of the rotating electrical machine (10) according to one of claims 1 to 3, characterized by , that one of the cover (70) and each of the insulator inner walls (54) has the engagement piece (75), and the other of the cover (70) and each of the insulator inner walls (54) has the insertion recess (61). [5] Stator (22) of the rotating electrical machine (10) according to claim 3, characterized by , that the stator core (23) has a slot (30) between the teeth (25) which are adjacent to one another in the circumferential direction of the yoke (24), the coil (28) is formed from the wire (29) wound around the tooth extension portion (26) and the insulator extension portion (53) through the slot (30), the stator (22) contains: a first insulating member (36) extending along an inner peripheral surface (24a) of the yoke (24) and the tooth side surfaces (26a) adjacent to each other in the circumferential direction of the yoke (24), and electrically insulating the stator core (23) from the coil (28) in the slot (30); and a second insulating member (46) arranged to cross a slot opening (31) between the tooth end portions (27) adjacent to each other in the circumferential direction of the yoke (24) and electrically insulates the tooth end portions (27) from the coil (28), the insert plate (68, 77, 78) has a support surface (85) located in the space between the insulator inner walls (54) that are adjacent to each other in the circumferential direction of the yoke (24) and located within the second insulating element (46) to support the second insulating element (46) in the radial direction of the yoke (24), and the support surface (85) is located outside the slot opening (31) in the radial direction of the yoke (24) when viewed in the axial direction of the yoke (24).

Images