Stator of rotary electric machine

Abstract

To increase the reliability of a stator of a rotary electric machine.SOLUTION: An insulation member 61 has a pair of stopper portions 68 projecting from both ends of an insulation body portion 62 toward both sides in a circumferential direction of a yoke, i.e. toward directions separated away from each other. The stopper portions 68 are inserted into slots from between insulator teeth portions 52 adjacent in the circumferential direction of the yoke in one insulator of a pair of insulators, and are opposed to an end surface located opposite, in an axis direction of the yoke, to a teeth flange portion 27 in the insulator teeth portion 52 in the other insulator of the pair of insulators so that the insulation member 61 is retained.SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

[0002] For example, as disclosed in Patent Document 1, a stator for a rotating electrical machine includes a stator core, a coil, and a pair of insulators. The stator core has a cylindrical yoke and a plurality of teeth. Each tooth extends from the circumferential surface of the yoke in the radial direction of the yoke. The stator core has slots formed between adjacent teeth in the circumferential direction of the yoke.

[0003] The teeth have tooth extensions and tooth flanges. The tooth extensions extend from the circumferential surface of the yoke. The tooth flanges protrude in the circumferential direction of the yoke from the tooth side surfaces located on both sides of the tooth extensions in the circumferential direction of the yoke. The coils are formed by winding a wire around the stator core. The coils include a pair of coil ends protruding from the core end faces, which are the end faces of the stator core located on both sides of the yoke in the axial direction. The pair of insulators are arranged opposite each core end face of the stator core. Each insulator provides insulation between each coil end and each core end face.

[0004] The insulator has a cylindrical insulator base and a plurality of insulator teeth. The insulator base is positioned so as to overlap the yoke in the axial direction of the yoke. Each insulator tooth extends radially from the circumferential surface of the insulator base. Each insulator tooth is positioned so as to overlap a corresponding tooth extension in the axial direction of the yoke.

[0005] The coils are formed by winding wires passing through the slots and wound around the tooth extensions and insulator teeth. The stator includes an insulating member. The insulating member extends in the axial direction of the yoke between adjacent coils in the slot in the circumferential direction of the yoke. The insulating member insulates adjacent coils in the slot in the circumferential direction of the yoke. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-72128 Summary of the Invention [Problem to be solved by the invention]

[0007] In such a rotating electric machine stator, if the yoke is not axially positioned in the insulating member, the yoke may become misaligned in the axial direction in the insulating member within the slot. If the yoke becomes misaligned in the axial direction in the insulating member within the slot, there is a risk of poor insulation between adjacent coils in the circumferential direction of the yoke within the slot. This reduces the reliability of the rotating electric machine stator. [Means for solving the problem]

[0008] The stator of a rotating electric machine that solves the above-mentioned problems includes a stator core having a cylindrical yoke and a plurality of teeth extending from the peripheral surface of the yoke in a radial direction of the yoke, with slots formed between adjacent teeth in the circumferential direction of the yoke; a coil formed by winding a winding around the stator core, the coil including a pair of coil ends protruding from each of core end faces, which are end faces of the stator core located on both sides of the yoke in the axial direction; and a coil disposed opposite each of the core end faces and connected to each of the coil ends. and a pair of insulators for insulating between the core end faces, wherein the teeth have tooth extension portions extending from the peripheral surface of the yoke and tooth flange portions protruding in the circumferential direction from tooth side surfaces located on both sides of the yoke in the circumferential direction of the tooth extension portions, and the insulators have a cylindrical insulator base portion arranged at a position overlapping the yoke in the axial direction, and flange portions extending from the peripheral surface of the insulator base in the radial direction of the insulator base and arranged at a position overlapping the tooth extension portions in the axial direction. a plurality of insulator teeth portions arranged at regular intervals, wherein the coils are formed by winding wire passing through the slots around the tooth extension portions and the insulator teeth portions, and the stator includes an insulating member that insulates adjacent coils in the circumferential direction within the slots, wherein the insulating member has a V-shaped cross section perpendicular to the axial direction, extends in the axial direction between adjacent coils in the circumferential direction, and has an insulating main body portion having two end portions that protrude from each of the core end faces on both sides in the axial direction, and a pair of retaining portions that protrude from the two end portions to both sides in the circumferential direction, wherein the retaining portion of the insulating member is inserted into the slot from between adjacent insulator teeth portions in the circumferential direction of one of the pair of insulators, and faces an end face of the other insulator of the pair of insulators that is located on the opposite side in the axial direction from the tooth flange portion of the insulator tooth portion, thereby preventing the insulating member from coming off.

[0009] With this configuration, even if the insulating member attempts to move in the axial direction of the yoke, each retaining portion abuts against the end face of each insulator tooth portion located on the opposite side of the yoke in the axial direction of the yoke, thereby restricting the axial movement of the yoke in the insulating member. This allows the yoke to be positioned in the axial direction on the insulating member. As a result, it is possible to avoid problems such as poor insulation between adjacent coils in the slot circumferentially around the yoke due to misalignment of the yoke in the axial direction on the insulating member within the slot.

[0010] Each retaining portion is located on the opposite side of the insulator tooth from the corresponding tooth flange in the axial direction of the yoke. Therefore, compared to when each retaining portion is located between the corresponding tooth flange and the corresponding insulator tooth, the position of each retaining portion relative to the corresponding insulator tooth can be easily confirmed. Therefore, the worker can easily confirm whether each retaining portion faces the end face of each insulator tooth, which is located on the opposite side of the yoke from the corresponding tooth flange in the axial direction of the yoke, in the axial direction of the yoke. Therefore, the worker can easily confirm whether the insulating member is properly positioned in the axial direction of the yoke. As a result, the insulating member can ensure optimal insulation between adjacent coils in the slot circumferentially around the yoke. This improves the reliability of the stator of a rotating electric machine.

[0011] In the stator of the rotating electric machine, the insulating member may have a pair of protruding insulating portions that protrude from the insulating body portion to both sides in the circumferential direction in directions away from each other to insulate the tooth flanges from the coils within the slots, thereby ensuring optimal insulation between the tooth flanges and the coils within the slots.

[0012] In the stator of the above-mentioned rotating electric machine, the insulator tooth portion has an insulator inner wall that protrudes on both sides in the circumferential direction and is positioned in a position that overlaps the tooth flange portion in the axial direction, and the insulating member is prevented from coming off by the anti-slip portion facing in the axial direction against an end face of the insulator inner wall that is positioned on the opposite side of the axial direction from the tooth flange portion.

[0013] The end face located on the opposite side of the yoke's axial direction from the tooth flange portion on the insulator inner wall is suitable as the end face located on the opposite side of the yoke's axial direction from the tooth flange portion of each insulator tooth portion with which each anti-slip portion abuts.

[0014] In the stator of the above-mentioned rotating electric machine, adjacent inner walls of the insulator in the circumferential direction are each formed with an insertion groove that opens to face each other in the circumferential direction and penetrates in the axial direction, and the insulating member is located on the stator core side in the axial direction relative to the anti-pullout portion, and has a pair of insertion portions that protrude from both ends of the insulating main body portion in directions away from each other in the circumferential direction by a smaller amount than the anti-pullout portion, and are inserted into the inside of adjacent insertion grooves in the circumferential direction.

[0015] For example, if the position of the insulating member shifts radially from the yoke, there is a risk that each retaining portion will no longer face the end face of each insulator tooth portion located on the opposite side of the yoke's axial direction from the tooth flange portion. Therefore, each insertion portion is inserted into the inner side of an insertion groove adjacent to each other in the circumferential direction of the yoke. Therefore, even if the insulating member attempts to move radially from the yoke, each insertion portion abuts against the inner surface of the insertion groove, thereby restricting the insulating member's movement radially from the yoke. This avoids the problem of the insulating member shifting radially from the yoke and each retaining portion no longer facing the end face of each insulator tooth portion located on the opposite side of the yoke's axial direction from the tooth flange portion.

[0016] In the stator of the above-mentioned rotating electric machine, the insulating member has a pair of protruding insulating portions that protrude from the insulating main body portion in directions away from each other on both sides of the circumferential direction and insulate between the tooth flange portion and the coil within the slot, and the protruding insulating portions are preferably located on the axial side of the stator core relative to the insertion portion.

[0017] By checking that each insertion portion is inserted into the corresponding insertion groove, the worker can determine that each protruding insulating portion is positioned between the tooth flange and the coil within the slot, thereby ensuring optimal insulation between the tooth flange and the coil within the slot.

[0018] In the stator of the above-mentioned rotating electric machine, the amount of protrusion from the insulating main body portion at the insertion portion is smaller than the amount of protrusion from the insulating main body portion at the protruding insulating portion, and if the portions of the insertion grooves facing each other in the circumferential direction that are furthest apart from each other in the circumferential direction are defined as the deepest portions of each insertion groove, the deepest portions may be opposite the protruding insulating portion in the axial direction.

[0019] For example, consider a case where the protrusion amount of the insertion portion from the insulating body portion is equal to or greater than the protrusion amount of the protruding insulating portion from the insulating body portion. In this case, to form insertion grooves in the inner wall of the insulator so that the insertion portion can be inserted into the insertion grooves, it is necessary to ensure that the deepest portions of each insertion groove do not face the protruding insulating portion in the axial direction of the yoke. As a result, the distance between the deepest portions of the insertion grooves facing each other in the circumferential direction of the yoke becomes long, thereby increasing the size of the inner wall of the insulator. Therefore, the protrusion amount of the insertion portion from the insulating body portion is made smaller than the protruding amount of the protruding insulating portion from the insulating body portion, so that the deepest portions of the insertion grooves face the protruding insulating portion in the axial direction of the yoke. This minimizes the distance between the deepest portions of the insertion grooves facing each other in the circumferential direction of the yoke, thereby minimizing the size of the inner wall of the insulator. This allows the size of the insulator to be reduced, which in turn reduces the size of the stator of a rotating electric machine.

[0020] In the stator of the above-mentioned rotating electric machine, each of the protruding insulating portions passes through the slot with both axial ends protruding from the core end face, and a relief recess is formed in the portion of the insulator inner wall that faces the tooth flange portion in the axial direction to avoid interference with the portion of the protruding insulating portion that protrudes from the core end face, and a clearance is preferably formed between the protruding insulating portion and the relief recess in the axial direction.

[0021] According to this, each protruding insulating portion passes through the slot with both axial ends of the yoke protruding from the core end face. Therefore, each protruding insulating portion can more effectively ensure insulation between the tooth flanges and the coils in the slot. Here, when inserting the insulating member into the slot, if the protruding insulating portion and the recessed portion interfere with each other in the axial direction of the yoke, it may be difficult to position each retaining portion on the opposite side of the insulator teeth from the tooth flanges in the axial direction of the yoke. Therefore, by forming a clearance between the protruding insulating portion and the recessed portion in the axial direction of the yoke, the protruding insulating portion and the recessed portion are less likely to interfere with each other in the axial direction of the yoke when inserting the insulating member into the slot. Therefore, when inserting the insulating member into the slot, it is easy to position each retaining portion on the opposite side of the insulator teeth from the tooth flanges in the axial direction of the yoke, which facilitates the insertion of the insulating member into the slot.

[0022] In the stator of the above-mentioned rotating electric machine, the insulator inner walls adjacent to each other in the circumferential direction are formed to face each other in the circumferential direction and to open on the opposite side of the axial direction from the stator core, and have notches that open at the ends of the insertion grooves located on the opposite side of the stator core, and the pair of anti-pullout portions are preferably arranged in the notches.

[0023] With this, since the pair of retaining portions are disposed in the notches, the retaining portions can be positioned as close as possible to the stator core relative to the inner wall of the insulator, thereby making it possible to reduce the size of the stator of the rotating electrical machine. [Effects of the Invention]

[0024] According to the present invention, the reliability of the stator of the rotating electrical machine can be improved. [Brief explanation of the drawings]

[0025] [Figure 1]FIG. 1 is a cross-sectional view showing an electric compressor according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the rotating electrical machine. [Figure 3] FIG. 3 is an exploded perspective view showing the stator core, the first insulator, and the second insulator. [Figure 4] FIG. 4 is a perspective view of the stator. [Figure 5] FIG. 5 is a perspective view of the stator. [Figure 6] FIG. 6 is a cross-sectional view showing a portion of the stator. [Figure 7] FIG. 7 is a cross-sectional view showing a portion of the stator. [Figure 8] FIG. 8 is a plan view showing a portion of the stator. [Figure 9] FIG. 9 is a perspective view showing a part of the stator. [Figure 10] FIG. 10 is a perspective view showing a part of the stator. DETAILED DESCRIPTION OF THE INVENTION

[0026] An embodiment of a stator for a rotating electric machine will be described below with reference to Figures 1 to 10. The stator for the rotating electric machine of this embodiment constitutes a part of an electric compressor. The electric compressor is used, for example, in a vehicle air conditioner.

[0027] <Basic configuration of electric compressor> As shown in Fig. 1, the electric compressor 10 includes a cylindrical housing 11. The housing 11 includes a discharge housing 12, a motor housing 13, and an inverter case 14. The discharge housing 12, the motor housing 13, and the inverter case 14 are made of a metal material. The discharge housing 12, the motor housing 13, and the inverter case 14 are made of aluminum, for example.

[0028] The motor housing 13 has an end wall 13a and a peripheral wall 13b. The end wall 13a is plate-shaped. The peripheral wall 13b extends cylindrically from the outer periphery of the end wall 13a. The discharge housing 12 is cylindrical. The discharge housing 12 is connected to an end of the peripheral wall 13b of the motor housing 13 opposite the end wall 13a. The inverter case 14 is cylindrical. The inverter case 14 is connected to the end wall 13a of the motor housing 13. The end wall 13a of the motor housing 13 and the inverter case 14 define an inverter chamber S1.

[0029] The motor housing 13 has a boss portion 13c. The boss portion 13c is cylindrical. The boss portion 13c protrudes from the center of the end surface of the end wall 13a of the motor housing 13 on the peripheral wall 13b side. The axis of the boss portion 13c coincides with the axis of the peripheral wall 13b of the motor housing 13. A hole 13h is formed in the end wall 13a of the motor housing 13. The hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction. The hole 13h is located closer to the peripheral wall 13b than the boss portion 13c.

[0030] The motor housing 13 has a suction port 13d. The suction port 13d is formed in a portion of the peripheral wall 13b of the motor housing 13 near the end wall 13a. The suction port 13d communicates between the inside and outside of the motor housing 13. A refrigerant fluid is drawn into the suction port 13d from the outside.

[0031] The electric compressor 10 includes a rotating shaft 15, a compression unit 16, an inverter 17, and a rotating electric machine 20. The rotating shaft 15, the compression unit 16, and the rotating electric machine 20 are housed in a motor housing 13. Thus, the housing 11 houses the rotating electric machine 20. The rotating shaft 15 is disposed in the motor housing 13 with the axis of the rotating shaft 15 coinciding with the axis of a peripheral wall 13b of the motor housing 13. The inverter 17 is housed in an inverter chamber S1.

[0032] The compression unit 16 and the rotating electric machine 20 are arranged side by side in the axial direction, which is the direction in which the axis of the rotating shaft 15 extends. The rotating electric machine 20 is arranged closer to the end wall 13a of the motor housing 13 than the compression unit 16. The compression unit 16, the rotating electric machine 20, and the inverter 17 are arranged side by side in this order in the axial direction of the rotating shaft 15.

[0033] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is disposed between the compression unit 16 and the rotating electric machine 20. Therefore, the shaft support member 18 serves as a partition wall between the rotating electric machine 20 and the compression unit 16. The shaft support member 18 and the end wall 13a and peripheral wall 13b of the motor housing 13 define a motor chamber S2. Therefore, the housing 11 has the motor chamber S2. The motor chamber S2 accommodates the rotating electric machine 20. Refrigerant is drawn into the motor chamber S2 through a suction port 13d.

[0034] The shaft support member 18 has an insertion hole 18h. The insertion hole 18h is formed in the center of the shaft support member 18. The axis of the insertion hole 18h coincides with the axis of the boss portion 13c. A first end of the rotating shaft 15 is inserted into the insertion hole 18h. A radial bearing 19a is provided between the insertion hole 18h and the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported by the shaft support member 18 via the radial bearing 19a. Furthermore, a second end of the rotating shaft 15 is inserted inside the boss portion 13c. A radial bearing 19b is provided between the boss portion 13c and the second end of the rotating shaft 15. The second end of the rotating shaft 15 is rotatably supported by the boss portion 13c via the radial bearing 19b.

[0035] The compression section 16 includes a fixed scroll 16a and an orbiting scroll 16b. The fixed scroll 16a is fixed to the motor housing 13. The orbiting scroll 16b is disposed opposite the fixed scroll 16a. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant. A volume-changeable compression chamber S3 is defined between the fixed scroll 16a and the orbiting scroll 16b. A discharge chamber S4 is defined between the fixed scroll 16a and the discharge housing 12. The refrigerant compressed by changing the volume of the compression chamber S3 is discharged into the discharge chamber S4. The rotating electric machine 20 rotates the rotary shaft 15. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant by the rotation of the rotary shaft 15.

[0036] <General configuration of rotating electric machine> The rotating electric machine 20 includes a rotor 21 and a stator 22. The stator 22 is cylindrical. The rotor 21 is disposed inside the stator 22. The rotor 21 includes a cylindrical rotor core 21a and a plurality of permanent magnets (not shown) embedded in the rotor core 21a. The rotor core 21a is fixed to the rotating shaft 15. The rotor core 21a is configured to be rotatable integrally with the rotating shaft 15.

[0037] <Stator core> The stator 22 includes a stator core 23. The stator core 23 is fixed to the inner circumferential surface of the peripheral wall 13b of the motor housing 13. Therefore, the stator core 23 is fixed to the housing 11. The stator 22 is assembled to the housing 11 by fitting the stator core 23 into the inner circumferential surface of the peripheral wall 13b of the motor housing 13 by, for example, shrink fitting. The axis of the stator core 23 coincides with the axis of the rotating shaft 15. Therefore, the axial direction of the stator core 23 coincides with the axial direction of the rotating shaft 15.

[0038] 2 and 3, the stator core 23 has a yoke 24 and a plurality of teeth 25. The yoke 24 is cylindrical. The stator core 23 is fixed to the motor housing 13 by fitting the outer peripheral surface of the yoke 24 into the inner peripheral surface of the peripheral wall 13b of the motor housing 13. The axial direction of the yoke 24 is also the axial direction of the stator core 23.

[0039] The teeth 25 extend from the inner peripheral surface 24a of the yoke 24 toward the radially inward direction of the yoke 24. The teeth 25 are arranged at intervals in the circumferential direction of the yoke 24. The teeth 25 are arranged at equal intervals in the circumferential direction of the yoke 24. The circumferential direction of the yoke 24 is also the circumferential direction of the stator core 23. Each tooth 25 extends from the inner peripheral surface 24a of the yoke 24 toward the axis of the stator core 23. In this embodiment, the stator core 23 has 15 teeth 25. The number of teeth 25 is not particularly limited, but the number of teeth 25 is a multiple of three.

[0040] As shown in Fig. 3, both end faces of the yoke 24 located in the axial direction are flat. Both end faces of each tooth 25 located in the axial direction of the yoke 24 are flat. The axial length of the yoke 24 is the same as the axial length of each tooth 25. The end face of the yoke 24 located on one side in the axial direction is located on the same plane as the end face of each tooth 25 located on one side in the axial direction of the yoke 24. The end face of the yoke 24 located on the other side in the axial direction is located on the same plane as the end face of each tooth 25 located on the other side in the axial direction of the yoke 24.

[0041] The end face of the yoke 24 located on one side in the axial direction and the end faces of each tooth 25 located on one side in the axial direction of the yoke 24 form a first core end face 23a located on one side in the axial direction of the yoke 24 of the stator core 23. The end face of the yoke 24 located on the other side in the axial direction and the end face of each tooth 25 located on the other side in the axial direction of the yoke 24 form a second core end face 23b located on the other side in the axial direction of the yoke 24 of the stator core 23. Therefore, the stator core 23 has a first core end face 23a and a second core end face 23b. The first core end face 23a is a core end face located on one side in the axial direction of the yoke 24 of the stator core 23. The second core end face 23b is a core end face located on the other side in the axial direction of the yoke 24 of the stator core 23. The first core end face 23a and the second core end face 23b are end faces located on both sides of the yoke 24 of the stator core 23 in the axial direction.

[0042] As shown in Figure 1, the stator core 23 is arranged within the motor housing 13 so that the first core end face 23a faces the support member 18 in the axial direction of the rotating shaft 15, and the second core end face 23b faces the end wall 13a of the motor housing 13 in the axial direction of the rotating shaft 15.

[0043] As shown in FIGS. 2 and 3, each tooth 25 has a tooth extension portion 26 and a tooth flange portion 27. The tooth extension portion 26 extends from the inner circumferential surface 24a of the yoke 24. The tooth extension portion 26 is thin-plate shaped. The tooth extension portion 26 extends from the first core end face 23a to the second core end face 23b of the stator core 23. Each tooth extension portion 26 has tooth side surfaces 26a located on both sides of the tooth extension portion 26 in the circumferential direction of the yoke 24. Each tooth side surface 26a is continuous with the inner circumferential surface 24a of the yoke 24. The tooth flange portions 27 protrude in the circumferential direction of the yoke 24 from the end of each tooth side surface 26a opposite the yoke 24. Therefore, tooth flange portions 27 protrude from the ends of tooth extension portions 26 opposite to yoke 24 on both sides in the circumferential direction of yoke 24 .

[0044] Slots 30 are formed in the stator core 23. The slots 30 are formed between adjacent teeth 25 in the circumferential direction of the yoke 24. The slots 30 are spaces defined by the inner peripheral surface 24a of the yoke 24, tooth side surfaces 26a that are adjacent in the circumferential direction of the yoke 24, and surfaces of the tooth flange portions 27 that are located on the yoke 24 side. The stator core 23 also has slot openings 31. The slot openings 31 are gaps between adjacent tooth flange portions 27 in the circumferential direction of the yoke 24. The slot openings 31 communicate with the slots 30.

[0045] <Insulator> As shown in Fig. 3, the stator 22 includes a first insulator 50 serving as an insulator. The first insulator 50 is cylindrical. The stator 22 also includes a second insulator 60 serving as an insulator. The second insulator 60 is cylindrical. The first insulator 50 and the second insulator 60 are made of, for example, a resin material.

[0046] The first insulator 50 and the second insulator 60 each have an insulator base 51 and a plurality of insulator teeth 52. The insulator base 51 is cylindrical. The first insulator 50 and the second insulator 60 are arranged relative to the stator core 23 with the axis of each insulator base 51 coinciding with the axis of the yoke 24. The axial direction of each insulator base 51 is also the axial direction of the yoke 24. The circumferential direction of each insulator base 51 is also the circumferential direction of the yoke 24. Furthermore, the radial direction of each insulator base 51 is also the radial direction of the yoke 24. The insulator base 51 is arranged at a position overlapping the yoke 24 in the axial direction of the yoke 24.

[0047] The first insulator 50 is disposed opposite the first core end face 23a of the stator core 23 while in contact with the first core end face 23a. The second insulator 60 is disposed opposite the second core end face 23b of the stator core 23 while in contact with the second core end face 23b. Therefore, the first insulator 50 and the second insulator 60 are a pair of insulators disposed opposite each core end face of the stator core 23. The outer diameter of the insulator base 51 is smaller than the outer diameter of the yoke 24. The inner diameter of the insulator base 51 is the same as the inner diameter of the yoke 24.

[0048] Each insulator tooth 52 extends radially inward from the inner circumferential surface 51a of the insulator base 51. The multiple insulator teeth 52 are arranged at intervals in the circumferential direction of the insulator base 51. The multiple insulator teeth 52 are arranged at equal intervals in the circumferential direction of the insulator base 51. Each insulator tooth 52 extends from the inner circumferential surface 51a of the insulator base 51 toward the axis of the insulator base 51. In this embodiment, the first insulator 50 and the second insulator 60 each have 15 insulator teeth 52. The number of insulator teeth 52 is the same as the number of teeth 25 of the stator core 23.

[0049] Each insulator tooth 52 has an insulator extension 53. Therefore, the first insulator 50 and the second insulator 60 have multiple insulator extensions 53. Each insulator extension 53 extends from the inner circumferential surface 51a of the insulator base 51 radially inward of the insulator base 51. Each insulator extension 53 is columnar. The circumferential width of each insulator extension 53 of the insulator base 51 is the same as the circumferential width of each tooth extension 26 of the yoke 24. Each insulator extension 53 contacts each tooth 25. Therefore, each insulator extension 53 is positioned to overlap with each tooth extension 26 in the axial direction of the yoke 24. Therefore, each insulator tooth 52 is positioned to overlap with each tooth extension 26 in the axial direction of the yoke 24.

[0050] Each insulator tooth portion 52 has an insulator inner wall 54. Therefore, the first insulator 50 and the second insulator 60 also have an insulator inner wall 54. Each insulator inner wall 54 protrudes along the insulator base 51 from an end of each insulator extension portion 53 opposite the insulator base 51. Each insulator inner wall 54 protrudes from each insulator extension portion 53 to both circumferential sides of the insulator base 51 and to the side of the insulator base 51 opposite the stator core 23 in the axial direction. In this way, each insulator inner wall 54 protrudes from each insulator extension portion 53. Each insulator inner wall 54 is positioned so as to overlap the tooth flange portion 27 in the axial direction of the yoke 24.

[0051] The surface 52a of each insulator tooth 52 located opposite the insulator base 51 is flush with the surface 25a of each tooth 25 located opposite the yoke 24. The surface of each insulator inner wall 54 located opposite the insulator base 51 forms the surface 52a of each insulator tooth 52 located opposite the insulator base 51. The surface of each tooth flange 27 located opposite the yoke 24 forms the surface 25a of each tooth 25 located opposite the yoke 24. The thickness of each insulator inner wall 54 is thicker than the thickness of each tooth flange 27. Therefore, each insulator inner wall 54 closes the portion of the surface of each tooth flange 27 located on the yoke 24 side in the slot 30 from the axial direction of the yoke 24.

[0052] An insertion groove 54a is formed in each insulator inner wall 54. One insertion groove 54a is formed on each surface of each insulator inner wall 54 located on both sides of the insulator base 51 in the circumferential direction. Adjacent insertion grooves 54a in the circumferential direction of the yoke 24 open to face each other in the circumferential direction of the yoke 24. Each insertion groove 54a penetrates each insulator inner wall 54 in the axial direction of the insulator base 51. In this way, adjacent insulator inner walls 54 in the circumferential direction of the yoke 24 are formed with insertion grooves 54a that open to face each other in the circumferential direction of the yoke 24 and penetrate the yoke 24 in the axial direction.

[0053] The first insulator 50 has three guide grooves 55. The three guide grooves 55 are arranged side by side in the axial direction of the first insulator 50. The three guide grooves 55 are formed on the outer peripheral surface of the insulator base 51. The three guide grooves 55 extend in the circumferential direction of the first insulator 50. The first insulator 50 has a plurality of through grooves 56. The first insulator 50 has five through grooves 56 corresponding to each guide groove 55. Each through groove 56 penetrates the insulator base 51 in the radial direction.

[0054] <Coil> As shown in Fig. 2, the stator 22 includes coils 28. The stator 22 includes coils 28 corresponding to the U-phase, V-phase, and W-phase, respectively. Therefore, the stator 22 includes coils 28 for multiple phases. Each coil 28 is formed by winding a winding 29 around the stator core 23 in a concentrated winding manner. A portion of each coil 28 for each phase passes through each slot 30.

[0055] As shown in Figures 4 and 5, the stator 22 has first coil ends 32 and second coil ends 33. As shown in Figure 4, the first coil ends 32 are part of the coils 28 of each phase and protrude from the first core end face 23a. As shown in Figure 5, the second coil ends 33 are part of the coils 28 of each phase and protrude from the second core end face 23b. Therefore, the first coil ends 32 and the second coil ends 33 are part of the coils 28 of each phase and are coil ends that protrude from the core end faces. In this way, the coils 28 are formed by winding the winding 29 around the stator core 23 and include a pair of coil ends that protrude from the core end faces, which are end faces of the stator core 23 located on both sides of the yoke 24 in the axial direction.

[0056] As shown in FIGS. 4 and 5 , the coils 28 of each phase are formed by serial winding. In serial winding, first, the winding 29 of each phase passing through each slot 30 is wound around each tooth extension 26, the insulator extension 53 of the first insulator 50, and the insulator extension 53 of the second insulator 60. Then, the winding 29 of each phase is sequentially wound in a concentrated winding manner around the tooth extensions 26, the insulator extensions 53 of the first insulator 50, and the insulator extensions 53 of the second insulator 60, which are arranged every third tooth extension 26 in the circumferential direction of the stator core 23. Therefore, the coils 28 of each phase are arranged every third coil in the circumferential direction of the stator core 23. In this embodiment, five coils 28 of each phase are arranged. The coils 28 of each phase are arranged in each slot 30 such that the coils of different phases are adjacent to each other in the circumferential direction of the stator core 23. In this way, the coil 28 is formed by winding the winding 29 passing through the slot 30 around each tooth extension portion 26, the insulator tooth portion 52 of the first insulator 50, and the insulator tooth portion 52 of the second insulator 60.

[0057] 4, the first insulator 50 provides insulation between the coils 28 of each phase and the first core end face 23a. The insulator base 51 of the first insulator 50 is positioned to overlap the first coil end 32 on the radially outer side of the yoke 24. Each insulator inner wall 54 of the first insulator 50 is positioned to overlap the first coil end 32 on the radially inner side of the yoke 24. Therefore, each insulator inner wall 54 of the first insulator 50 is positioned to overlap the tooth flange portion 27 in the axial direction of the yoke 24, and is positioned to overlap the first coil end 32 on the radially inner side of the yoke 24.

[0058] 5, the second insulator 60 provides insulation between the coils 28 of each phase and the second core end face 23b. The insulator base 51 of the second insulator 60 is positioned to overlap the second coil end 33 on the radially outer side of the yoke 24. Each insulator inner wall 54 of the second insulator 60 is positioned to overlap the second coil end 33 on the radially inner side of the yoke 24. Therefore, each insulator inner wall 54 of the second insulator 60 is positioned to overlap the tooth flange portion 27 in the axial direction of the yoke 24, and is positioned to overlap the second coil end 33 on the radially inner side of the yoke 24.

[0059] 4, the windings 29 of each phase include crossover wires 57 that connect the coils 28 of each phase together in the circumferential direction of the stator core 23. The crossover wires 57 of each phase are drawn out from the first coil ends 32 of the coils 28 of each phase and guided into the guide grooves 55 corresponding to each phase via the through grooves 56 corresponding to each phase.

[0060] <Airtight terminal> As shown in FIG. 1, the electric compressor 10 includes a hermetic terminal 40. The hermetic terminal 40 has three conductive members 41 corresponding to the coils 28 of each phase. Therefore, the electric compressor 10 includes the conductive members 41. Note that FIG. 1 illustrates only one conductive member 41. Each conductive member 41 is a cylindrical metal terminal extending linearly. A first end of each conductive member 41 is electrically connected to the inverter 17 within the inverter chamber S1. A second end of each conductive member 41 protrudes from the inverter chamber S1 into the motor housing 13 through a hole 13h. The hermetic terminal 40 also includes a support plate 42. The support plate 42 supports the three conductive members 41 while insulating them from one another. The support plate 42 is fixed around the hole 13h on the outer surface of the end wall 13a of the motor housing 13 within the inverter chamber S1.

[0061] The stator 22 is provided with lead wires 43. The lead wires 43 are drawn out from the rotating electric machine 20. The lead wires 43 are drawn out from the second coil ends 33 of the coils 28 of each phase. Thus, three lead wires 43 are drawn out from the rotating electric machine 20. Note that only one lead wire 43 is shown in FIG. 1 .

[0062] The stator 22 includes a cluster block 44. The cluster block 44 houses three connection terminals 45 corresponding to the coils 28 of each phase. The cluster block 44 has insulating properties. The cluster block 44 is made of, for example, a resin material. Each connection terminal 45 electrically connects each conductive member 41 to each lead wire 43.

[0063] Electric power from the inverter 17 is supplied to the rotating electric machine 20 via the conductive members 41, the connection terminals 45, and the lead wires 43. This drives the rotating electric machine 20. Therefore, the inverter 17 drives the rotating electric machine 20.

[0064] <Slot insulation part> As shown in FIG. 2 , the stator 22 includes slot insulating portions 36. One slot insulating portion 36 is disposed in each slot 30. The slot insulating portions 36 are sheet-shaped. The slot insulating portions 36 are formed by bending a strip-shaped insulating sheet so as to extend along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a adjacent to each other in the circumferential direction of the yoke 24. The slot insulating portions 36 are inserted into the slots 30 with their longitudinal directions aligned with the axial direction of the yoke 24. The slot insulating portions 36 extend from the first core end face 23a to the second core end face 23b of the stator core 23. The slot insulating portions 36 protrude in the axial direction from both end faces of the first core end face 23a and the second core end face 23b. The slot insulating portions 36 insulate the stator core 23 from a portion of the coil 28 passing through each slot 30.

[0065] 6, the slot insulating portion 36 has a first insulating portion 37. The first insulating portion 37 is a portion of the slot insulating portion 36 that extends along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent in the circumferential direction of the yoke 24. Therefore, the slot insulating portion 36 extends along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent in the circumferential direction of the yoke 24.

[0066] As shown in Fig. 7, the slot insulating portion 36 has a pair of second insulating portions 38. The second insulating portions 38 extend toward each other from both ends of the first insulating portion 37 that are located opposite the inner circumferential surface 24a of the yoke 24. Therefore, the pair of second insulating portions 38 extend toward each other from adjacent tooth side surfaces 26a in the circumferential direction of the yoke 24. The pair of second insulating portions 38 insulate the coil 28 from the tooth flange portions 27 located on both sides of the slot opening 31. Each second insulating portion 38 is spaced apart from the tooth flange portions 27.

[0067] <Insulating materials> As shown in FIG. 2, the stator 22 includes insulating members 61. One insulating member 61 is disposed in each slot 30. The insulating member 61 is sheet-shaped and is formed by folding a strip-shaped insulating sheet. The insulating member 61 is inserted into the slot 30 with the longitudinal direction of the insulating member 61 aligned with the axial direction of the yoke 24.

[0068] As shown in FIGS. 6 and 7 , the insulating member 61 has an insulating main body portion 62. The insulating main body portion 62 extends in the axial direction of the yoke 24 between coils 28 adjacent to each other in the circumferential direction of the yoke 24. The insulating main body portion 62 has a first insulating extension portion 63, a second insulating extension portion 64, and a connecting end portion 65. The first insulating extension portion 63 and the second insulating extension portion 64 extend toward each other from the inner side toward the outer side in the radial direction of the yoke 24. The connecting end portion 65 connects the end of the first insulating extension portion 63 located on the outer side in the radial direction of the yoke 24 to the end of the second insulating extension portion 64 located on the outer side in the radial direction of the yoke 24. In this way, the insulating main body portion 62 has a V-shaped cross section perpendicular to the axial direction of the yoke 24.

[0069] The first insulating extension portion 63 faces one of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. The second insulating extension portion 64 faces the other of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. In this manner, the insulating main body portion 62 is disposed between the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. The insulating main body portion 62 insulates the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. In this manner, the insulating member 61 extends in the axial direction of the yoke 24 between the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. The insulating member 61 insulates the coils 28 adjacent to each other in the circumferential direction of the yoke 24.

[0070] As shown in FIG. 7 , the insulating member 61 has a pair of protruding insulating portions 66. One of the pair of protruding insulating portions 66 protrudes from an end of the first insulating extension portion 63 of the insulating main body portion 62 located radially inside the yoke 24 toward the opposite side of the second insulating extension portion 64 in the circumferential direction of the yoke 24. One of the pair of protruding insulating portions 66 is disposed between one of the tooth flange portions 27 and one of the pair of second insulating portions 38 located on both sides of the slot opening 31. One of the pair of protruding insulating portions 66 and one of the pair of second insulating portions 38 overlap in the radial direction of the yoke 24. One of the pair of protruding insulating portions 66 insulates between one of the tooth flange portions 27 located on both sides of the slot opening 31 and one of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30.

[0071] The other of the pair of protruding insulating portions 66 protrudes from an end of the second insulating extension portion 64 of the insulating body portion 62 located radially inward of the yoke 24 toward the opposite side of the first insulating extension portion 63 in the circumferential direction of the yoke 24. The other of the pair of protruding insulating portions 66 is disposed between the other of the tooth flange portions 27 and the other of the pair of second insulating portions 38 located on both sides of the slot opening 31. The other of the pair of protruding insulating portions 66 and the other of the pair of second insulating portions 38 overlap in the radial direction of the yoke 24. The other of the pair of protruding insulating portions 66 insulates between the other of the tooth flange portions 27 located on both sides of the slot opening 31 and the other of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. In this way, the pair of protruding insulating portions 66 protrude away from each other from the insulating main body portion 62 on both sides in the circumferential direction of the yoke 24 , thereby providing insulation between the tooth flange portion 27 and the coil 28 within the slot 30 .

[0072] The insulating body portion 62 connects the pair of protruding insulating portions 66 while straddling the slot opening 31 in the circumferential direction of the yoke 24. Therefore, the insulating member 61 is disposed so as to straddle the slot opening 31 in the circumferential direction of the yoke 24. The insulating member 61 insulates the coil 28 from each of the tooth flange portions 27 located on both sides of the slot opening 31.

[0073] 8, both end portions of the insulating body portion 62 located on both sides of the yoke 24 in the axial direction protrude from the first core end face 23a and the second core end face 23b of the stator core 23. Therefore, the axial length of the yoke 24 in the insulating body portion 62 is longer than the axial length of the yoke 24 in the stator core 23. In this manner, both end portions of the yoke 24 in the insulating body portion 62 protrude from the slots 30. Therefore, the insulating body portion 62 has both end portions that protrude from the first core end face 23a and the second core end face 23b on both sides of the yoke 24 in the axial direction.

[0074] Furthermore, both ends of each protruding insulating portion 66 located on either side of the yoke 24 in the axial direction protrude from the first core end face 23a and the second core end face 23b of the stator core 23. Therefore, the axial length of the yoke 24 in each protruding insulating portion 66 is longer than the axial length of the yoke 24 in the stator core 23. In this way, each protruding insulating portion 66 passes through the slot 30 with both axial ends of the yoke 24 protruding from the first core end face 23a and the second core end face 23b.

[0075] The axial length of the yoke 24 in each protruding insulating portion 66 is shorter than the axial length of the yoke 24 in the insulating body portion 62. Both axial ends of the yoke 24 in the insulating body portion 62 protrude from both axial ends of the yoke 24 in each protruding insulating portion 66, respectively.

[0076] <Passage part> 9 and 10, the insulating member 61 has a pair of insertion portions 67. The pair of insertion portions 67 protrude from the insulating main body portion 62 at both ends of the insulating main body portion 62 in directions separating them from each other on both sides in the circumferential direction of the yoke 24. Note that while FIGS. 9 and 10 illustrate the configuration of one of the ends of the insulating main body portion 62, the configuration of the other of the ends of the insulating main body portion 62 is substantially the same as the configuration of one of the ends of the insulating main body portion 62, and therefore detailed description thereof will be omitted.

[0077] The pair of insertion portions 67 of the insulating body portion 62 extend away from each other on both sides of the circumferential direction of the yoke 24 relative to the portions of the protruding insulating portions 66 that extend from the axial end of the yoke 24. One of the pair of insertion portions 67 extends from an end of the first insulating extension portion 63 of the insulating body portion 62 located on the radially inner side of the yoke 24 toward the opposite side of the second insulating extension portion 64 in the circumferential direction of the yoke 24. The other of the pair of insertion portions 67 extends from an end of the second insulating extension portion 64 of the insulating body portion 62 located on the radially inner side of the yoke 24 toward the opposite side of the first insulating extension portion 63 in the circumferential direction of the yoke 24. Each insertion portion 67 is continuous with the end of the protruding insulating portion 66 in the axial direction of the yoke 24. Therefore, the protruding insulating portions 66 are each continuous with the end of the insertion portion 67 on the stator core 23 side. In this way, the protruding insulating portion 66 is located on the stator core 23 side of the insertion portion 67 in the axial direction of the yoke 24 .

[0078] As shown in FIG. 10 , the amount of protrusion H1 of the insertion portion 67 from the insulating main body portion 62 is smaller than the amount of protrusion H2 of the protruding insulating portion 66 from the insulating main body portion 62. In the insertion grooves 54a that face each other in the circumferential direction of the yoke 24, the deepest portions 54e of the insertion grooves 54a are the portions that are furthest apart in the circumferential direction of the yoke 24. The deepest portions 54e of the insertion grooves 54a face the protruding insulating portion 66 in the axial direction of the yoke 24. The pair of insertion portions 67 are inserted into the respective insides of the insertion grooves 54a that are adjacent in the circumferential direction of the yoke 24. In this way, the pair of insertion portions 67 protrude from the insulating main body portion 62 at both ends of the insulating main body portion 62 to both sides in the circumferential direction of the yoke 24 in directions separating them from each other, and are inserted into the respective insides of the insertion grooves 54a that are adjacent in the circumferential direction of the yoke 24.

[0079] <Prevention part> As shown in FIGS. 9 and 10 , the insulating member 61 has a pair of retaining portions 68. The pair of retaining portions 68 protrude from both ends of the insulating main body portion 62 toward both sides of the yoke 24 in the circumferential direction away from each other. One of the pair of retaining portions 68 protrudes from an end of the first insulating extension portion 63 of the insulating main body portion 62 located radially inside the yoke 24 toward the opposite side of the second insulating extension portion 64 in the circumferential direction of the yoke 24. The other of the pair of retaining portions 68 protrudes from an end of the second insulating extension portion 64 of the insulating main body portion 62 located radially inside the yoke 24 toward the opposite side of the first insulating extension portion 63 in the circumferential direction of the yoke 24. Each retaining portion 68 is continuous with an end of each insertion portion 67 located opposite the protruding insulating portion 66. Therefore, each retaining portion 68 is continuous with an end of each insertion portion 67 located opposite the stator core 23. The pair of insertion portions 67 are located on the stator core 23 side of the yoke 24 in the axial direction relative to the retaining portions 68 .

[0080] Each retaining portion 68 protrudes from the insulating main body portion 62 in a direction away from each other on both sides in the circumferential direction of the yoke 24 further than each insertion portion 67. Therefore, the pair of insertion portions 67 protrudes less than the retaining portions 68 from both ends of the insulating main body portion 62 in a direction away from each other on both sides in the circumferential direction of the yoke 24, and is inserted into the insides of the insertion grooves 54a that are adjacent in the circumferential direction of the yoke 24. Each retaining portion 68 faces, in the axial direction of the yoke 24, an end face of each of the insulator inner walls 54 that are adjacent in the circumferential direction of the yoke 24, that is located on the opposite side in the axial direction of the yoke 24 from the tooth flange portions 27. In this way, the pair of anti-slip portions 68 extend from the insulating main body portion 62 in a direction away from each other on both sides of the yoke 24 in the circumferential direction beyond each insertion portion 67, and face the end faces located on the opposite side of the axial direction of the yoke 24 from the tooth flange portions 27 on each of the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24 in the axial direction of the yoke 24.

[0081] The retaining portion 68 located at one of both ends of the insulating main body 62 is inserted into the slot 30 from between the insulator teeth 52 adjacent to each other in the circumferential direction of the yoke 24 of the first insulator 50. The retaining portion 68 located at one of both ends of the insulating main body 62 faces, in the axial direction of the yoke 24, an end face of the insulator teeth 52 of the second insulator 60 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portions 27. At this time, the retaining portion 68 located at the other of both ends of the insulating main body 62 faces, in the axial direction of the yoke 24, an end face of the insulator teeth 52 of the first insulator 50 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portions 27. In this way, the insulating member 61 is prevented from coming off by having the retaining portion 68 inserted into the slot 30 between the insulator teeth 52 of one of the pair of insulators that are adjacent in the circumferential direction of the yoke 24, and facing, in the axial direction of the yoke 24, an end face of the insulator teeth 52 of the other of the pair of insulators that is located on the opposite side of the axial direction of the yoke 24 from the tooth flange portions 27. The insulating member 61 is prevented from coming off by having the retaining portion 68 facing, in the axial direction of the yoke 24, an end face of the insulator inner wall 54 that is located on the opposite side of the axial direction of the yoke 24 from the tooth flange portions 27.

[0082] <Relief recess> A relief recess 70 is formed in the insulator inner wall 54. The relief recess 70 is formed in a portion of the insulator inner wall 54 that faces the tooth flange portion 27 in the axial direction of the yoke 24. Each relief recess 70 is formed to face each insulator inner wall 54 in the circumferential direction of the yoke 24. An end of each insertion groove 54a that is located on the stator core 23 side is open in each relief recess 70. Each relief recess 70 penetrates each insulator inner wall 54 in the thickness direction of the insulator inner wall 54.

[0083] Both ends of each protruding insulating portion 66 that protrude from the first core end face 23a and the second core end face 23b are located inside the corresponding relief recess 70. Therefore, each relief recess 70 avoids interference with the parts of each protruding insulating portion 66 that protrude from the first core end face 23a and the second core end face 23b. A clearance 71 is formed between the protruding insulating portion 66 and the relief recess 70 in the axial direction of the yoke 24.

[0084] <Notch> Adjacent insulator inner walls 54 in the circumferential direction of the yoke 24 have notches 72. Each notch 72 faces the corresponding insulator inner wall 54 in the circumferential direction of the yoke 24 and is formed to open on the opposite side of the stator core 23 in the axial direction of the yoke 24. Each notch 72 opens at an end of each insertion groove 54a located on the opposite side of the stator core 23. Each notch 72 penetrates each insulator inner wall 54 in the thickness direction of the insulator inner wall 54. Each notch 72 forms an end face located on the opposite side of the yoke 24 in the axial direction of the yoke 24 from the tooth flange portion 27 of each insulator inner wall 54. The pair of retaining portions 68 are disposed inside each of the notches 72 adjacent to each other in the circumferential direction of the yoke 24 and face the periphery of each insertion groove 54a in each of the insulator inner walls 54 adjacent to each other in the axial direction of the yoke 24. In this manner, the pair of retaining portions 68 are disposed in the notches 72 .

[0085] [Operation of the embodiment] Next, the operation of this embodiment will be described. Even if the insulating member 61 attempts to move in the axial direction of the yoke 24, each retaining portion 68 abuts against an end face of each insulator inner wall 54 located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27, thereby restricting the axial movement of the yoke 24 in the insulating member 61. Thus, the yoke 24 is positioned in the axial direction in the insulating member 61.

[0086] Each insertion portion 67 is inserted into the corresponding insertion groove 54a that is adjacent in the circumferential direction of the yoke 24. Therefore, even if the insulating member 61 attempts to move in the radial direction of the yoke 24, each insertion portion 67 abuts against the inner surface of each insertion groove 54a, thereby restricting the radial movement of the insulating member 61 with respect to the yoke 24.

[0087] Each retaining portion 68 is located on the opposite side of each tooth flange portion 27 in the axial direction of the yoke 24 with respect to each insulator inner wall 54. Therefore, the position of each retaining portion 68 with respect to each insulator inner wall 54 can be easily confirmed compared to, for example, a case where each retaining portion 68 is located between each tooth flange portion 27 and each insulator inner wall 54. Therefore, the worker can easily confirm whether each retaining portion 68 faces, in the axial direction of the yoke 24, an end face of each insulator inner wall 54 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27.

[0088] [Effects of the embodiment] The above embodiment can provide the following effects. (1) The insulating member 61 has a pair of retaining portions 68. As a result, even if the insulating member 61 attempts to move in the axial direction of the yoke 24, each retaining portion 68 abuts against an end surface of each insulator tooth portion 52 located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27. This restricts the axial movement of the yoke 24 in the insulating member 61. This allows the yoke 24 to be positioned in the axial direction in the insulating member 61. As a result, it is possible to avoid a problem in which the yoke 24 in the insulating member 61 becomes misaligned in the axial direction within the slot 30, resulting in poor insulation between coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30.

[0089] Each retaining portion 68 is located on the opposite side of the insulator tooth portion 52 from the corresponding tooth flange portion 27 in the axial direction of the yoke 24. Therefore, compared to when each retaining portion 68 is located between each tooth flange portion 27 and each insulator tooth portion 52, the position of each retaining portion 68 relative to each insulator tooth portion 52 can be more easily confirmed. Therefore, the worker can easily confirm whether each retaining portion 68 faces, in the axial direction of the yoke 24, the end face of each insulator tooth portion 52 that is located on the opposite side of the yoke 24 from the corresponding tooth flange portion 27. Therefore, the worker can easily confirm whether the insulating member 61 has properly positioned the yoke 24 in the axial direction. As a result, the insulating member 61 can effectively insulate the coils 28 adjacent to each other in the circumferential direction of the yoke 24 within the slot 30. As a result, the reliability of the stator 22 of the rotating electric machine 20 can be improved.

[0090] (2) The insulating member 61 has a pair of protruding insulating portions 66. With this, each protruding insulating portion 66 can ensure suitable insulation between the tooth flange portion 27 and the coil 28 within the slot 30.

[0091] (3) The insulating member 61 is prevented from coming off by the retaining portions 68 facing, in the axial direction of the yoke 24, an end face of the insulator inner wall 54 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portions 27. The end face of the insulator inner wall 54 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portions 27 is suitable as the end face that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portions 27 of each insulator tooth portion 52 with which each retaining portion 68 abuts.

[0092] (4) Insertion grooves 54a are formed in adjacent insulator inner walls 54 in the circumferential direction of the yoke 24. The insulating member 61 has a pair of insertion portions 67. For example, if the position of the insulating member 61 is shifted radially of the yoke 24, there is a risk that each retaining portion 68 will no longer face, in the axial direction of the yoke 24, an end face of each insulator tooth portion 52 that is located on the opposite side of the axial direction of the yoke 24 from the tooth flange portion 27. Therefore, each insertion portion 67 is inserted into the inside of each insertion groove 54a that is adjacent in the circumferential direction of the yoke 24. Therefore, even if the insulating member 61 attempts to move radially of the yoke 24, each insertion portion 67 abuts against the inner surface of each insertion groove 54a, thereby restricting the radial movement of the insulating member 61 with respect to the yoke 24. This avoids the problem that the position of the insulating member 61 shifts radially from the yoke 24, causing each retaining portion 68 to no longer face the end face of each insulator tooth portion 52 located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27 in the yoke 24.

[0093] (5) The protruding insulating portions 66 are located on the stator core 23 side in the axial direction of the yoke 24 relative to the insertion portions 67. Accordingly, by confirming that each insertion portion 67 is inserted into each insertion groove 54a, an operator can determine that each protruding insulating portion 66 is located between the tooth flange portions 27 and the coils 28 within the slots 30. Therefore, each protruding insulating portion 66 can ensure optimal insulation between the tooth flange portions 27 and the coils 28 within the slots 30.

[0094] (6) For example, consider a case where the protrusion amount H1 of the insertion portion 67 from the insulating body portion 62 is equal to or greater than the protrusion amount H2 of the protruding insulating portion 66 from the insulating body portion 62. In this case, to form insertion grooves 54a in the insulator inner wall 54 so that the insertion portion 67 can be inserted into the insertion grooves 54a, it is necessary to ensure that the deepest portions 54e of the insertion grooves 54a do not face the protruding insulating portions 66 in the axial direction of the yoke 24. As a result, the distance between the deepest portions 54e of the insertion grooves 54a facing each other in the circumferential direction of the yoke 24 becomes longer, which increases the size of the insulator inner wall 54. This increases the size of the first insulator 50 and the second insulator 60. Therefore, the protrusion amount H1 of the insertion portion 67 from the insulating body portion 62 is made smaller than the protrusion amount H2 of the protruding insulating portion 66 from the insulating body portion 62. The deepest portions 54e of the insertion grooves 54a are arranged to face the protruding insulating portion 66 in the axial direction of the yoke 24. This makes it possible to minimize the distance between the deepest portions 54e of the insertion grooves 54a that face each other in the circumferential direction of the yoke 24, thereby minimizing the size of the insulator inner wall 54. This makes it possible to reduce the size of the first insulator 50 and the second insulator 60, which in turn makes it possible to reduce the size of the stator 22 of the rotating electric machine 20.

[0095] (7) Each protruding insulating portion 66 passes through the slot 30 with both axial ends of the yoke 24 protruding from the first core end face 23a and the second core end face 23b. Therefore, each protruding insulating portion 66 can more effectively ensure insulation between the tooth flange portion 27 and the coil 28 within the slot 30. Consider a case where, for example, the protruding insulating portion 66 interferes with the recessed portion 70 in the axial direction of the yoke 24 when inserting the insulating member 61 into the slot 30. In this case, it may be difficult to position each retaining portion 68 on the opposite side of the insulator teeth 52 from the tooth flange portion 27 in the axial direction of the yoke 24. Therefore, a clearance 71 is formed between the protruding insulating portion 66 and the recessed portion 70 in the axial direction of the yoke 24. This makes it less likely for the protruding insulating portion 66 to interfere with the recessed portion 70 in the axial direction of the yoke 24 when inserting the insulating member 61 into the slot 30. Therefore, when inserting the insulating member 61 into the slot 30, each retaining portion 68 can be easily positioned on the opposite side of the insulator tooth portion 52 from each tooth flange portion 27 in the axial direction of the yoke 24. This makes it easy to insert the insulating member 61 into the slot 30.

[0096] (8) The insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24 face each other in the circumferential direction of the yoke 24, are formed to open on the opposite side of the axial direction of the yoke 24 from the stator core 23, and have notches 72 that open at the ends of the insertion grooves 54a that are located on the opposite side from the stator core 23. The pair of retaining portions 68 are disposed in the notches 72. As a result, because the pair of retaining portions 68 are disposed in the notches 72, the positions of the retaining portions 68 relative to the insulator inner walls 54 can be made as close as possible to the stator core 23. As a result, the size of the stator 22 of the rotating electric machine 20 can be reduced.

[0097] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0098] In the above embodiment, the insulating member 61 does not necessarily have to have the pair of protruding insulating portions 66. The key is that the insulating member 61 only needs to be capable of insulating the coils 28 adjacent to each other in the circumferential direction of the yoke 24 from each other.

[0099] In the embodiment, the protrusion amount H1 of the insertion portion 67 from the insulating body 62 may be equal to or greater than the protrusion amount H2 of the protruding insulating portion from the insulating body 62 . In the embodiment, the clearance 71 may not be formed between the protruding insulating portion 66 and the recessed portion 70 in the axial direction of the yoke 24, and the protruding insulating portion 66 and the recessed portion 70 may be in contact with each other.

[0100] In the above embodiment, each protruding insulating portion 66 may be disposed in the slot 30 in a state in which both axial ends of the yoke 24 do not protrude from the first core end face 23a and the second core end face 23b.

[0101] In the embodiment, the notches 72 do not have to be formed in the inner walls 54 of the insulators. In the above embodiment, the slot insulating portion 36 may not have the pair of second insulating portions 38.

[0102] In the above embodiment, the slot insulating portions 36 may be resin layers that are formed by integrally molding resin onto the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a that are adjacent to each other in the circumferential direction of the yoke 24 in advance.

[0103] In the embodiment, the first insulator 50 and the second insulator 60 may not have the insulator inner wall 54 and the insertion groove 54a. In this case, the retaining portion 68 faces, for example, the insulator extending portion 53 in the axial direction of the yoke 24. In short, the insulating member 61 is prevented from coming off by the retaining portion 68 facing, in the axial direction of the yoke 24, an end face of the insulator teeth portion 52 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27.

[0104] In the embodiment, the first insulator 50 and the second insulator 60 may not have the insertion groove 54a. In this case, the retaining portion 68 faces, for example, the insulator inner wall 54 in the axial direction of the yoke 24. In short, the insulating member 61 is prevented from coming off by the retaining portion 68 facing, in the axial direction of the yoke 24, an end face of the insulator inner wall 54 that is located on the opposite side of the yoke 24 in the axial direction from the tooth flange portion 27.

[0105] In the above embodiment, the rotor 21 is disposed inside the stator 22. However, the stator 22 may be disposed inside a cylindrical rotor 21. In this case, the teeth 25 extend from the outer peripheral surface of the yoke 24 radially outward from the yoke 24. In short, it is sufficient that the teeth 25 extend from the peripheral surface of the yoke 24 in the radial direction of the yoke 24, and the tooth extension portions 26 extend from the peripheral surface of the yoke 24. Furthermore, it is sufficient that the insulator tooth portions 52 extend from the peripheral surface of the insulator base 51 in the radial direction of the insulator base 51.

[0106] In the above-described embodiment, the compression unit 16 is not limited to a scroll type, and may be, for example, a piston type, a vane type, a rotary type, or the like. In the above embodiment, the electric compressor 10 is used in a vehicle air conditioning system, but the present invention is not limited to this. For example, the electric compressor 10 may be installed in a fuel cell vehicle, and the compressor 16 may compress air as a fluid to be supplied to the fuel cell. [Explanation of symbols]

[0107] 20... rotating electric machine, 22... stator, 23... stator core, 23a... first core end face which is a core end face, 23b... second core end face which is a core end face, 24... yoke, 25... teeth, 26... teeth extension portion, 26a... teeth side surface, 27... teeth flange portion, 28... coil, 29... winding, 30... slot, 32... first coil end which is a coil end, 33... second coil end which is a coil end, 50...first insulator as insulator, 51...insulator base portion, 52...insulator teeth portion, 54...insulator inner wall, 54a...insertion groove, 54e...deepest portion, 60...second insulator as insulator, 61...insulating member, 62...insulating main body portion, 66...protruding insulating portion, 67...insertion portion, 68...anti-pullout portion, 70...relief recess, 71...clearance, 72...notch.

Claims

1. a stator core having a cylindrical yoke and a plurality of teeth extending from a peripheral surface of the yoke in a radial direction of the yoke, with slots formed between adjacent teeth in the circumferential direction of the yoke; a coil formed by winding a winding around the stator core, the coil including a pair of coil ends protruding from core end faces, which are end faces of the stator core located on both sides of the yoke in the axial direction; a pair of insulators arranged opposite each of the core end faces and insulating each of the coil ends from each of the core end faces, The teeth are a teeth extension portion extending from a peripheral surface of the yoke; and tooth flange portions projecting in the circumferential direction from tooth side surfaces located on both sides of the tooth extension portions in the circumferential direction of the yoke, The insulator is a cylindrical insulator base portion disposed at a position overlapping the yoke in the axial direction; a plurality of insulator teeth extending from a peripheral surface of the insulator base in a radial direction of the insulator base and arranged at positions overlapping with each of the tooth extension portions in the axial direction, the coil is formed by winding a wire passing through the slot around the tooth extension portion and the insulator tooth portion, A stator for a rotating electric machine including an insulating member that insulates adjacent coils in the circumferential direction within the slot, The insulating member is an insulating body portion having a V-shaped cross section perpendicular to the axial direction, extending in the axial direction between adjacent coils in the circumferential direction, and including two end portions projecting from each of the core end faces on both sides in the axial direction; a pair of retaining portions extending from the end portions to both sides in the circumferential direction in directions away from each other, A stator for a rotating electric machine, characterized in that the insulating member is prevented from coming out by the anti-slip portion being inserted into the slot from between adjacent insulator tooth portions in the circumferential direction of one of the pair of insulators, and facing in the axial direction against the end face of the other insulator of the pair that is located on the opposite side of the axial direction from the tooth flange portion of the insulator tooth portion.

2. 2. The stator of a rotating electric machine according to claim 1, characterized in that the insulating member has a pair of protruding insulating portions that protrude from the insulating main body portion in directions away from each other on both sides of the circumferential direction and provide insulation between the tooth flange portion and the coil within the slot.

3. the insulator teeth portion has an insulator inner wall that protrudes on both sides in the circumferential direction and is positioned to overlap the tooth flange portion in the axial direction, The stator of a rotating electric machine as described in claim 1, characterized in that the insulating member is prevented from coming off by the retaining portion facing the end face of the insulator inner wall located on the opposite side of the axial direction from the tooth flange portion.

4. The insulator inner walls adjacent to each other in the circumferential direction are each formed with an insertion groove that opens to face each other in the circumferential direction and penetrates in the axial direction, 4. The stator of claim 3, wherein the insulating member is located on the axial side of the stator core relative to the retaining portion, and has a pair of insertion portions that protrude from both ends of the insulating main body portion in directions away from each other in the circumferential direction by a smaller amount than the retaining portion, and are inserted into the insides of adjacent insertion grooves in the circumferential direction.

5. the insulating member has a pair of protruding insulating portions that protrude from the insulating main body portion to both sides in the circumferential direction in directions away from each other and that insulate the tooth flange portion from the coil within the slot, 5. The stator of claim 4, wherein the protruding insulating portion is located on the stator core side in the axial direction with respect to the insertion portion.

6. a protrusion amount of the insertion portion from the insulating body portion is smaller than a protrusion amount of the protruding insulating portion from the insulating body portion; In the insertion grooves facing each other in the circumferential direction, when the portions furthest from each other in the circumferential direction are defined as the deepest portions of the insertion grooves, 6. The stator of claim 5, wherein the deepest portion faces the protruding insulating portion in the axial direction.

7. each of the protruding insulating portions passes through the slot with both ends in the axial direction protruding from the core end face; a recessed portion is formed in a portion of the insulator inner wall facing the tooth flange in the axial direction to avoid interference with a portion of the protruding insulating portion that protrudes from the core end surface, 7. The stator of claim 6, wherein a clearance is formed between the protruding insulating portion and the recessed portion in the axial direction.

8. the insulator inner walls adjacent in the circumferential direction face each other in the circumferential direction and are formed to open on the opposite side of the stator core in the axial direction, and each have a notch that opens at an end of the insertion groove that is located on the opposite side of the stator core, 8. The stator for a rotating electric machine according to claim 4, wherein the pair of retaining portions are disposed in the notches.

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