Electric compressor

Abstract

The invention provides an electric compressor which improves the reliability of a motor and improves the assembling workability of a stator relative to a shell. An electric compressor is provided with a compression unit, a motor having a stator, and a housing. The stator includes a stator core, a multi-phase coil, an insulator, an inter-phase insulating sheet, and a cover member. The cover member has an annular cover end wall and a cylindrical cover inner wall extending from an inner peripheral portion of the cover end wall toward the insulator inner wall. The cover end wall has a conical wall inclined so as to approach the inner wall of the insulator as the cover end wall tends to the inner wall of the cover. The conical wall is continuous with the cover inner wall.

Description

Technical Field

[0001] The present invention relates to an electric compressor. Background Art

[0002] The electric compressor includes a rotating shaft, a compression unit, a motor, and a housing. The compression unit compresses the fluid by the rotation of the rotating shaft. The motor rotates the rotating shaft. The housing includes a motor chamber. The motor chamber accommodates the motor. The motor includes a stator.

[0003] For example, as disclosed in Japanese Patent Gazette No. 2022-150980, the stator includes a stator core, multi-phase coils, and an insulator. The stator core is fixed to the housing. The coils of each phase are formed by winding multi-phase windings around the stator core in a concentrated winding manner. The coils of each phase include coil ends. The coil ends protrude from a core end face of the stator core, which is an end face located in the axial direction of the rotating shaft. The insulator is arranged opposite to the core end face of the stator core. The insulator insulates the coil and the core end face from each other. The insulator has an insulator inner wall. The insulator inner wall is arranged at a position overlapping with the coil end on the radial inner side of the rotating shaft.

[0004] The stator is provided with an interphase insulating sheet. The interphase insulating sheet extends in the radial direction of the rotating shaft. Furthermore, the interphase insulating sheet insulates coils adjacent to each other in the circumferential direction of the rotating shaft. In addition, the interphase insulating sheet protrudes from the core end face of the stator core. Furthermore, the interphase insulating sheet insulates coil ends adjacent to each other in the circumferential direction of the rotating shaft in a state where a portion of the interphase insulating sheet protrudes to the side opposite to the core end face than the coil end. In this way, by protruding a portion of the interphase insulating sheet to the side opposite to the core end face than the coil end, insulation between coil ends adjacent to each other in the circumferential direction of the rotating shaft can be easily ensured.

[0005] However, such a stator is assembled to the housing by, for example, embedding the stator core into the inner circumference of the housing by shrink fitting. The shrink fitting is performed by inserting the stator core into the housing to a predetermined shrink fitting position after the housing is heated and expanded so that the inner diameter of the housing is larger than the outer diameter of the stator core. The shrink fitting is performed by causing the inner circumference of the housing to be in close contact with the outer circumference of the stator core due to the shrinkage of the housing as it moves to normal temperature.

[0006] Therefore, when the stator core is shrink-fitted to the housing, for example, a jig is inserted inside the stator core to position the stator core. Then, the housing is arranged relative to the stator core in such a manner that the stator core, which has been positioned relative to the jig, is inserted relative to the inner circumferential surface of the housing to a predetermined shrink-fit position. In this way, the stator is assembled relative to the housing.

[0007] At this time, when the clamp is inserted into the inner side of the stator core, there is a possibility that the clamp contacts the coil end, or the clamp contacts the portion of the interphase insulating sheet that protrudes to the side opposite to the core end face from the coil end and the inner wall of the insulator. In this way, there is a possibility that the coil is damaged, or the interphase insulating sheet is deformed, and the insulation between the coil ends adjacent to each other in the circumferential direction of the rotating shaft cannot be ensured. As a result, the reliability of the motor is reduced.

[0008] Here, there is a case where the stator has an insulating cover member. The cover member is arranged opposite to the insulator. In such a cover member, for example, there is a case where it has an annular cover end wall and a cylindrical cover inner wall. The cover end wall covers the coil end on the side opposite to the core end face relative to the coil end in the axial direction of the rotating shaft. In addition, the cover end wall covers a portion of the interphase insulating sheet that protrudes to the side opposite to the core end face than the coil end and the insulator inner wall. The cover inner wall extends from the inner circumference of the cover end wall toward the insulator inner wall.

[0009] Accordingly, when the clamp used when the stator core is heat-fitted to the housing is inserted into the inner side of the stator core, the clamp is prevented from contacting the coil end by the cover end wall and the cover inner wall. In addition, the clamp is prevented from contacting the portion of the interphase insulating sheet that protrudes to the side opposite to the core end face than the coil end and the inner wall of the insulator by the cover end wall and the cover inner wall. Thus, it is prevented from damaging the coil or deforming the interphase insulating sheet so that the insulation of the coil ends adjacent to each other in the circumferential direction of the rotating shaft cannot be ensured. As a result, the reliability of the motor is improved.

[0010] However, if the cover end wall of the cover member is arranged so as to cover the portion of the coil end or the interphase insulating sheet that protrudes to the side opposite to the core end face from the coil end or the inner wall of the insulator, there is a possibility that when inserting the clamp into the inner side of the stator core, the clamp and the cover member interfere with each other, making it difficult to insert the clamp into the inner side of the stator core. As a result, the assembly workability of the stator with respect to the housing is deteriorated.

[0011] Therefore, it is desirable to facilitate the insertion of the clamp into the inner side of the stator core while avoiding the clamp from contacting the coil end or the portion of the interphase insulating sheet that protrudes from the coil end or the inner wall of the insulator to the side opposite to the core end face. In other words, it is desirable to improve the reliability of the motor while improving the assembly workability of the stator relative to the housing. Summary of the invention

[0012] An electric compressor of one embodiment includes: a rotating shaft; a compression part configured to compress a fluid by rotating the rotating shaft; a motor configured to rotate the rotating shaft; and a housing having a motor chamber for accommodating the motor. The motor includes a stator. The stator includes: a stator core fixed to the housing; multi-phase coils formed by winding multi-phase wires around the stator core in a concentrated winding manner and including coil ends protruding from a core end face of the stator core that is an end face located in the axial direction of the rotating shaft; an insulator arranged opposite to the core end face and insulating the coil from the core end face; an interphase insulating sheet extending in the radial direction of the rotating shaft and insulating coils adjacent to each other in the circumferential direction of the rotating shaft; and an insulating cover member arranged opposite to the insulator. The insulator includes an insulator inner wall arranged at a position overlapping the coil end on the radial inner side of the rotating shaft. The interphase insulating sheet insulates the coil ends adjacent in the circumferential direction from each other in a state where the sheet protrudes from the core end face and a portion thereof protrudes to the side opposite to the core end face from the insulator inner wall. The cover member comprises: an annular cover end wall, which covers the coil ends on the side opposite to the core end face in the axial direction and covers a portion of the interphase insulating sheet protruding to the side opposite to the core end face from the insulator inner wall; and a cylindrical cover inner wall, which extends from the inner circumference of the cover end wall toward the insulator inner wall. The cover end wall has a conical wall inclined in a manner that approaches the insulator inner wall as it approaches the cover inner wall. The conical wall is continuous with the cover inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view showing an electric compressor according to an embodiment.

[0014] Figure 2 This is a cross-sectional view of the motor.

[0015] Figure 3 It is an exploded perspective view showing the stator core, the first insulator, and the second insulator.

[0016] Figure 4 It is a perspective view of the stator showing a state before the cover member is arranged with respect to the first insulator.

[0017] Figure 5 It is a perspective view of the stator showing a state in which the cover member is arranged with respect to the first insulator.

[0018] Figure 6 is a cross-sectional view showing a part of the stator.

[0019] Figure 7 This is a perspective view for explaining an interphase insulating sheet.

[0020] Figure 8 is a cross-sectional view showing a part of the stator.

[0021] Fig. 9 is a cross-sectional view showing a part of the stator.

[0022] Fig.10 is a cross-sectional view showing a part of the electric compressor.

[0023] Fig.11 This is a cross-sectional view for explaining thermal charging.

[0024] Fig.12 This is a cross-sectional view for explaining thermal charging. DETAILED DESCRIPTION

[0025] Below, according to Figures 1 to 12 An embodiment in which an electric compressor is embodied will be described. The electric compressor of this embodiment is used in, for example, a vehicle air conditioner.

[0026] <Basic structure of electric compressor>

[0027] like Figure 1 As shown, the electric compressor 10 includes a cylindrical housing 11. The housing 11 includes a discharge housing 12, a motor housing 13, and an inverter housing 14. The discharge housing 12, the motor housing 13, and the inverter housing 14 are made of metal materials. The discharge housing 12, the motor housing 13, and the inverter housing 14 are made of, for example, aluminum.

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

[0029] The motor housing 13 has a protrusion 13c. The protrusion 13c is cylindrical. The protrusion 13c protrudes from the central part of the end wall 13a of the motor housing 13. The protrusion 13c extends from the surface of the end wall 13a that defines the motor chamber S2. The axis of the protrusion 13c coincides with the axis of the peripheral wall 13b of the motor housing 13. In addition, a hole 13h is formed in the end wall 13a of the motor housing 13. The hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction. The hole 13h is located closer to the peripheral wall 13b than the protrusion 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 close to the end wall 13a. The suction port 13d allows the inside and outside of the motor housing 13 to communicate. A refrigerant as a fluid is sucked 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 motor 20. The rotating shaft 15, the compression unit 16, and the motor 20 are accommodated in the motor housing 13. Therefore, the housing 11 accommodates the motor 20. The rotating shaft 15 is arranged in the motor housing 13 in a state where the axis of the rotating shaft 15 coincides with the axis of the peripheral wall 13b of the motor housing 13. The inverter 17 is accommodated in the inverter chamber S1.

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

[0033] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is disposed between the compression section 16 and the motor 20. Therefore, the shaft support member 18 serves as a partition wall between the motor 20 and the compression section 16. Furthermore, the motor chamber S2 is divided by the shaft support member 18 and the end wall 13a and the peripheral wall 13b of the motor housing 13. Therefore, the housing 11 includes the motor chamber S2. The motor chamber S2 accommodates the motor 20. Refrigerant is sucked into the motor chamber S2 from the suction port 13d.

[0034] The shaft support member 18 has an insertion hole 18h. The insertion hole 18h is formed in the central part of the shaft support member 18. The axis of the insertion hole 18h coincides with the axis of the protrusion 13c. The 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 on the shaft support member 18 via the radial bearing 19a. In addition, the second end of the rotating shaft 15 is inserted into the inner side of the protrusion 13c. A radial bearing 19b is provided between the protrusion 13c and the second end of the rotating shaft 15. The second end of the rotating shaft 15 is rotatably supported on the protrusion 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. Therefore, the fixed scroll 16a is fixed to the housing 11. The orbiting scroll 16b is arranged in a manner opposite to the fixed scroll 16a. The orbiting scroll 16b revolves by the rotation of the rotating shaft 15 while meshing with the fixed scroll 16a. The compression section 16 is driven by the rotation of the rotating shaft 15. The compression section 16 compresses the refrigerant. A compression chamber S3 capable of changing the volume is divided between the fixed scroll 16a and the orbiting scroll 16b. A discharge chamber S4 is divided between the fixed scroll 16a and the discharge housing 12. And, the refrigerant compressed by the change in the volume of the compression chamber S3 is discharged to the discharge chamber S4. The motor 20 rotates the rotating shaft 15. And, the compression section 16 is driven by the rotation of the rotating shaft 15. The compression section 16 compresses the refrigerant by the rotation of the rotating shaft 15.

[0036] <General structure of the motor>

[0037] The motor 20 includes a rotor 21 and a stator 22. The stator 22 is cylindrical. The rotor 21 is arranged inside the stator 22. The rotor 21 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.

[0038] <Stator core>

[0039] The stator 22 includes a stator core 23. The stator core 23 is fixed to the inner circumferential surface of the peripheral wall 13b of the motor housing 13. Therefore, the stator core 23 is fixed to the housing 11. The stator 22 is assembled to the housing 11 by, for example, embedding the stator core 23 into the inner circumferential surface of the peripheral wall 13b of the motor housing 13 by shrink fitting. The axis of the stator core 23 coincides with the axis of the rotating shaft 15. Therefore, the axial direction of the stator core 23 coincides with the axial direction of the rotating shaft 15.

[0040] like Figure 2 as well as Figure 3 As shown, the stator core 23 has a yoke 24 and a plurality of teeth 25. The yoke 24 is cylindrical. The stator core 23 is fixed to the motor housing 13 by the outer peripheral surface of the yoke 24 being embedded in the inner peripheral surface of the peripheral wall 13b of the motor housing 13. It should be noted that the axial direction of the yoke 24 is also referred to as the axial direction of the stator core 23. Therefore, the axial direction of the yoke 24 is also referred to as the axial direction of the rotating shaft 15.

[0041] A plurality of teeth 25 extend from the inner circumferential surface 24a of the yoke 24 toward the radial inner side of the yoke 24. It should be noted that the radial direction of the yoke 24 is also referred to as the radial direction of the rotating shaft 15. The plurality of teeth 25 are arranged at intervals in the circumferential direction of the yoke 24. The plurality of teeth 25 are arranged at equal intervals in the circumferential direction of the yoke 24. It should be noted that the circumferential direction of the yoke 24 is also referred to as the circumferential direction of the stator core 23. In addition, the circumferential direction of the yoke 24 is also referred to as the circumferential direction of the rotating shaft 15. Each tooth 25 extends from the inner circumferential surface 24a of the yoke 24 toward the axis of the stator core 23. In the present embodiment, the stator core 23 has 15 teeth 25. It should be noted that the number of teeth 25 is not particularly limited, but the number of teeth 25 is a multiple of 3.

[0042] like Figure 3 As shown, both end surfaces of the yoke 24 located in the axial direction are flat. Both end surfaces 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 of the yoke 24. The first end surface of the yoke 24 located on one side of the axial direction, i.e., the first side, and the first end surface of each tooth 25 located on one side of the axial direction, i.e., the first side, of the yoke 24 are located on the same plane. The second end surface of the yoke 24 located on the other side of the axial direction, i.e., the second side, and the second end surface of each tooth 25 located on the other side of the axial direction, i.e., the second side, of the yoke 24 are located on the same plane.

[0043] The first end surface of the yoke 24 located on the first side in the axial direction and the first end surface of each tooth 25 located on the first side in the axial direction of the yoke 24 form a first core end surface 23a located on the first side in the axial direction of the stator core 23. The second end surface of the yoke 24 located on the second side in the axial direction and the second end surface of each tooth 25 located on the second side in the axial direction of the yoke 24 form a second core end surface 23b located on the second side in the axial direction of the stator core 23. Therefore, the stator core 23 has a first core end surface 23a and a second core end surface 23b. The first core end surface 23a is a core end surface of the stator core 23 located on the first side in the axial direction of the rotating shaft 15. The second core end surface 23b is a core end surface of the stator core 23 located on the second side in the axial direction of the rotating shaft 15.

[0044] like Figure 1 As shown, the stator core 23 is arranged in the motor case 13 such that the first core end surface 23 a faces the shaft support member 18 in the axial direction of the rotating shaft 15 and the second core end surface 23 b faces the end wall 13 a of the motor case 13 in the axial direction of the rotating shaft 15 .

[0045] like Figure 2 as well as Figure 3As shown, each tooth 25 has a tooth extension portion 26 and a tooth flange portion 27. The tooth extension portion 26 is a thin plate extending from the inner circumferential surface 24a of the yoke 24. The tooth extension portion 26 extends from the first core end surface 23a of the stator core 23 to the second core end surface 23b. Each tooth extension portion 26 has a tooth side surface 26a located on both sides of the yoke 24 in the circumferential direction of the tooth extension portion 26. Each tooth side surface 26a is continuous with the inner circumferential surface 24a of the yoke 24. The tooth flange portion 27 protrudes in the circumferential direction of the yoke 24 from the end portion of each tooth side surface 26a on the side opposite to the yoke 24. Therefore, the tooth flange portion 27 protrudes from the end portion of the tooth extension portion 26 on the side opposite to the yoke 24 to both sides of the yoke 24 in the circumferential direction.

[0046] The stator core 23 is formed with a groove 30. The groove 30 is formed between the teeth 25 adjacent in the circumferential direction of the yoke 24. The groove 30 is a space defined by the inner circumferential surface 24a of the yoke 24, the tooth side surfaces 26a adjacent in the circumferential direction of the yoke 24, and the surface of the tooth flange portion 27 that faces the yoke 24. In addition, the stator core 23 has a groove opening 31. The groove opening 31 is a gap between the tooth flange portions 27 adjacent in the circumferential direction of the yoke 24. The groove opening 31 is connected to the groove 30.

[0047] like Figure 3 , Figure 4 as well as Figure 5 As shown, the yoke 24 has a plurality of first insertion recesses 34. Each first insertion recess 34 is formed on the outer peripheral surface of the yoke 24. Each first insertion recess 34 opens at the first core end surface 23a of the stator core 23. The plurality of first insertion recesses 34 are arranged at equal intervals in the circumferential direction of the yoke 24 on the outer peripheral surface of the yoke 24. For example, four first insertion recesses 34 are provided on the yoke 24. A locking protrusion 34f is provided on each first insertion recess 34. The locking protrusion 34f protrudes from the first insertion recess 34 in the radial direction of the yoke 24.

[0048] The yoke 24 has a plurality of second insertion recesses 35. Each second insertion recess 35 is formed on the outer peripheral surface of the yoke 24. Each second insertion recess 35 opens at the first core end surface 23a of the stator core 23. The plurality of second insertion recesses 35 are arranged at equal intervals in the circumferential direction of the yoke 24 on the outer peripheral surface of the yoke 24.

[0049] <Insulator>

[0050] like Figure 3 As shown, the stator 22 includes a first insulator 50. The first insulator 50 is cylindrical. In addition, the stator 22 includes a second insulator 60. The second insulator 60 is cylindrical. The first insulator 50 and the second insulator 60 are made of, for example, a resin material.

[0051] The first insulator 50 and the second insulator 60 each include an insulator base 51 and a plurality of insulator teeth 52. The insulator base 51 is cylindrical. The first insulator 50 and the second insulator 60 are arranged relative to the stator core 23 in a state where the axis of each insulator base 51 is aligned with the axis of the yoke 24. The axial direction of each insulator base 51 is also referred to as the axial direction of the yoke 24. In addition, the circumferential direction of each insulator base 51 is also referred to as the circumferential direction of the yoke 24. Furthermore, the radial direction of each insulator base 51 is also referred to as the radial direction of the yoke 24.

[0052] The first insulator 50 is disposed opposite to 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 to the second core end face 23b of the stator core 23 while in contact with the second core end face 23b. The outer diameter of the insulator base 51 is smaller than the outer diameter of the yoke 24. The inner diameter of the insulator base 51 is the same as the inner diameter of the yoke 24.

[0053] Each insulator tooth 52 extends from the inner circumferential surface 51a of each insulator base 51 to the radial inner side of the insulator base 51. A plurality of insulator teeth 52 are arranged at intervals in the circumferential direction of the insulator base 51. A plurality of 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 the present 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 included in the stator core 23.

[0054] Each insulator tooth portion 52 has an insulator extension portion 53. Therefore, the first insulator 50 and the second insulator 60 have a plurality of insulator extension portions 53. Each insulator extension portion 53 is a columnar shape extending from the inner circumferential surface 51a of the insulator base 51 to the radial inner side of the insulator base 51. The width of each insulator extension portion 53 in the circumferential direction of the insulator base 51 is the same as the width of each tooth extension portion 26 in the circumferential direction of the yoke 24. Each insulator extension portion 53 contacts each tooth 25. Therefore, each insulator extension portion 53 is arranged at a position overlapping with each tooth extension portion 26 in the axial direction of the yoke 24.

[0055] Each insulator tooth portion 52 has an insulator inner wall 54. Therefore, the first insulator 50 and the second insulator 60 have an insulator inner wall 54. Each insulator inner wall 54 protrudes from the end portion of each insulator extension portion 53 on the side opposite to the insulator base portion 51 along the insulator base portion 51. Each insulator inner wall 54 protrudes from each insulator extension portion 53 to both sides in the circumferential direction of the insulator base portion 51 and to the side of the insulator base portion 51 in the axial direction opposite to the stator core 23. In this way, each insulator inner wall 54 protrudes from each insulator extension portion 53. Each insulator inner wall 54 is arranged at a position overlapping with the tooth flange portion 27 in the axial direction of the yoke 24.

[0056] The surface 52a of each insulator tooth portion 52 located on the side opposite to the insulator base portion 51 is located on the same plane as the surface 25a of each tooth 25 located on the side opposite to the yoke 24. The surface of each insulator inner wall 54 located on the side opposite to the insulator base portion 51 forms the surface 52a of each insulator tooth portion 52 located on the side opposite to the insulator base portion 51. The surface of each tooth flange portion 27 located on the side opposite to the yoke 24 forms the surface 25a of each tooth 25 located on the side opposite to the yoke 24. The thickness of each insulator inner wall 54 is thicker than the thickness of each tooth flange portion 27. Therefore, each insulator inner wall 54 blocks the portion of the surface of each tooth flange portion 27 facing the yoke 24 from the axial direction of the yoke 24 in the groove 30.

[0057] Each insulator inner wall 54 has an insertion groove 54a. One insertion groove 54a is formed on each surface of the insulator inner wall 54 located on both sides of the insulator base 51 in the circumferential direction. Each insertion groove 54a penetrates each insulator inner wall 54 in the axial direction of the insulator base 51. The space inside each insertion groove 54a is a part of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24.

[0058] The first insulator 50 has three guide grooves 55. The three guide grooves 55 are arranged in the axial direction of the first insulator 50. The three guide grooves 55 are formed on the outer peripheral surface of the insulator base 51. The three guide grooves 55 extend along the circumferential direction of the first insulator 50. The first insulator 50 has five through grooves 56 corresponding to each guide groove 55. Each through groove 56 penetrates the insulator base 51 in the radial direction.

[0059] <Coil>

[0060] like Figure 2As shown in FIG. 1 , the stator 22 includes a multi-phase coil 28. The stator 22 includes coils 28 corresponding to the U phase, the V phase, and the W phase. Each coil 28 is formed by winding the winding 29 of each phase around the stator core 23 in a concentrated winding manner. Therefore, the stator 22 includes a multi-phase coil 28 formed by winding the winding 29 of each phase around the stator core 23 in a concentrated winding manner. A portion of each coil 28 of each phase passes through each slot 30.

[0061] like Figure 1 As shown, the stator 22 includes a first coil end 32 and a second coil end 33. The first coil end 32 is a part of each coil 28 of each phase and protrudes from the first core end face 23a. The second coil end 33 is a part of each coil 28 of each phase and protrudes from the second core end face 23b. Therefore, the first coil end 32 and the second coil end 33 are a part of the coil 28 of each phase and are coil ends protruding from the core end face. In this way, the coil 28 is formed by winding the winding 29 around the stator core 23, and includes a coil end protruding from the core end face of the stator core 23, which is an end face located in the axial direction of the rotating shaft 15.

[0062] The coils 28 of each phase are formed by series winding. In the series winding, first, the windings 29 of each phase passing through each slot 30 are wound around each tooth extension 26, the insulator extension 53 of the first insulator 50, and the insulator extension 53 of the second insulator 60. And, the windings 29 of each phase are sequentially wound in a concentrated winding manner around the tooth extension 26, the insulator extension 53 of the first insulator 50, and the insulator extension 53 of the second insulator 60 arranged every two in the circumferential direction of the stator core 23. Therefore, the coils 28 of each phase are arranged every two in the circumferential direction of the stator core 23. In the present embodiment, five coils 28 of each phase are arranged. The coils 28 of each phase are arranged so that different phases in each slot 30 are adjacent to each other in the circumferential direction of the rotating shaft 15. In this way, the winding wire 29 passing through the groove 30 is wound around each tooth extension portion 26 , the insulator extension portion 53 of the first insulator 50 , and the insulator extension portion 53 of the second insulator 60 , thereby forming the coil 28 .

[0063] The first insulator 50 insulates the coil 28 of each phase from the first core end surface 23a. The insulator base 51 of the first insulator 50 is arranged at a position overlapping with the first coil end 32 on the radially outer side of the rotating shaft 15. The insulator inner walls 54 of the first insulator 50 are arranged at a position overlapping with the first coil end 32 on the radially inner side of the rotating shaft 15. Therefore, the insulator inner walls 54 of the first insulator 50 are arranged at a position overlapping with the tooth flange 27 in the axial direction of the rotating shaft 15 and overlapping with the first coil end 32 on the radially inner side of the rotating shaft 15.

[0064] The second insulator 60 insulates the coil 28 of each phase from the second core end surface 23b. The insulator base 51 of the second insulator 60 is arranged at a position overlapping with the second coil end 33 on the radially outer side of the rotating shaft 15. Each insulator inner wall 54 of the second insulator 60 is arranged at a position overlapping with the second coil end 33 on the radially inner side of the rotating shaft 15. Therefore, each insulator inner wall 54 of the second insulator 60 is arranged at a position overlapping with the tooth flange portion 27 in the axial direction of the rotating shaft 15 and overlapping with the second coil end 33 on the radially inner side of the rotating shaft 15.

[0065] like Figure 4 As shown, the winding 29 of each phase includes a jumper wire 57 that connects the coils 28 of each phase to each other in the circumferential direction of the stator core 23. The jumper wire 57 of each phase is led out from the first coil end 32 of the coil 28 of each phase and is guided to the corresponding guide groove 55 through the corresponding through groove 56.

[0066] <Trench insulation part>

[0067] like Figure 2 As shown in the figure, the stator 22 has a slot insulating portion 36. One slot insulating portion 36 is arranged in each slot 30. The slot insulating portion 36 is in a sheet shape. The slot insulating portion 36 is formed by bending a strip-shaped insulating sheet along the inner circumferential surface 24a of the yoke 24 and the tooth side surface 26a adjacent in the circumferential direction of the yoke 24. The slot insulating portion 36 is inserted into the slot 30 in a state where the length direction of the slot insulating portion 36 is consistent with the axial direction of the yoke 24. The slot insulating portion 36 extends from the first core end surface 23a of the stator core 23 to the second core end surface 23b, and protrudes from both end surfaces of the first core end surface 23a and the second core end surface 23b toward the axial direction of the rotating shaft 15. The slot insulating portion 36 insulates a portion of the coil 28 passing through each slot 30 from the stator core 23.

[0068] like Figure 6As shown in the figure, the trench insulating portion 36 has an insulating body portion 37. The insulating body portion 37 is a portion of the trench insulating portion 36 that extends along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a adjacent to the circumferential direction of the yoke 24. Therefore, the trench insulating portion 36 extends along the inner circumferential surface 24a of the yoke 24 and the tooth side surfaces 26a adjacent to the circumferential direction of the yoke 24.

[0069] The groove insulating portion 36 has a pair of protruding portions 38. Each protruding portion 38 protrudes from both ends of the insulating main body portion 37 located on the side opposite to the inner peripheral surface 24a of the yoke 24 in directions approaching each other. Therefore, the pair of protruding portions 38 protrude from the tooth side surfaces 26a adjacent in the circumferential direction of the yoke 24 in directions approaching each other. In addition, the pair of protruding portions 38 insulate the tooth flange portions 27 located on both sides sandwiching the groove opening 31 from the coil 28. Each protruding portion 38 is separated from the tooth flange portion 27.

[0070] <Interphase insulation sheet>

[0071] like Figure 2 As shown in the figure, the stator 22 includes an interphase insulating sheet 46. One interphase insulating sheet 46 is arranged in each groove 30. The interphase insulating sheet 46 is in a sheet shape. The interphase insulating sheet 46 is formed by bending a strip-shaped insulating sheet. The interphase insulating sheet 46 is inserted into the groove 30 in a state where the length direction of the interphase insulating sheet 46 is consistent with the axial direction of the yoke 24. Therefore, the length direction of the interphase insulating sheet 46 is consistent with the axial direction of the rotating shaft 15.

[0072] like Figure 6 As shown in FIG. 1 , the interphase insulating sheet 46 includes a first insulating portion 47, a second insulating portion 48, and a third insulating portion 49. The first insulating portion 47 is disposed between one of the two tooth flange portions 27 located on both sides of the groove opening 31 and one of the pair of protruding portions 38. That is, the first insulating portion 47 is disposed between the first and second tooth flange portions 27 located on both sides of the groove opening 31. Figure 6 The tooth flange portion 27 on the left side is located Figure 6 The first insulating portion 47 overlaps with the corresponding protruding portion 38 in the radial direction of the yoke 24. The first insulating portion 47 insulates the corresponding tooth flange portion 27 from one of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 in the groove 30.

[0073] The second insulating portion 48 is disposed between the other of the two tooth flange portions 27 located on both sides of the groove opening 31 and the other of the pair of protruding portions 38. That is, the first insulating portion 48 is disposed between the other of the two tooth flange portions 27 located on both sides of the groove opening 31. Figure 6 The tooth flange portion 27 on the right side is located Figure 6The second insulating portion 48 overlaps with the corresponding extending portion 38 in the radial direction of the yoke 24. Therefore, each extending portion 38 overlaps with the interphase insulating sheet 46 in the radial direction of the yoke 24. In addition, the second insulating portion 48 insulates the corresponding tooth flange portion 27 from the other of the coils 28 adjacent to each other in the circumferential direction of the yoke 24 in the groove 30.

[0074] The third insulating portion 49 is a V-shaped cross-section that extends from the end of the first insulating portion 47 near the second insulating portion 48 toward the inner circumferential surface 24a of the yoke 24, then bends and extends toward the second insulating portion 48 and is connected to the end of the second insulating portion 48 near the first insulating portion 47. Therefore, the third insulating portion 49 connects the first insulating portion 47 and the second insulating portion 48. In this way, the interphase insulating sheet 46 extends in the radial direction of the rotating shaft 15. The third insulating portion 49 is arranged between the coils 28 adjacent to each other in the circumferential direction of the rotating shaft 15 in the groove 30. And the third insulating portion 49 insulates the coils 28 adjacent to each other in the circumferential direction of the rotating shaft 15 in the groove 30. Therefore, the third insulating portion 49 is a V-shaped cross-section that connects the first insulating portion 47 and the second insulating portion 48 and insulates the coils 28 adjacent to each other in the circumferential direction of the rotating shaft 15 in the groove 30.

[0075] In this way, the interphase insulating sheet 46 is arranged in a state of straddling the groove opening 31 in the circumferential direction of the rotating shaft 15. Furthermore, the interphase insulating sheet 46 insulates the tooth flanges 27 located on both sides sandwiching the groove opening 31 from the coils 28. The interphase insulating sheet 46 extends in the radial direction of the rotating shaft 15, and insulates the coils 28 adjacent to each other in the circumferential direction of the rotating shaft 15.

[0076] like Figure 4 As shown in FIG. 1 , both ends of the interphase insulating sheet 46 in the longitudinal direction protrude from the first core end surface 23a and the second core end surface 23b, respectively. Figure 6 As shown in the figure, the portions of the first insulating portion 47 and the second insulating portion 48 of the interphase insulating sheet 46 protruding from the first core end face 23a and the second core end face 23b are inserted into the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the rotating shaft 15. The first insulating portion 47 is inserted into one of the two insertion grooves 54a formed in a part of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. The second insulating portion 48 is inserted into the other of the two insertion grooves 54a formed in a part of the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the yoke 24. In this way, the interphase insulating sheet 46 protrudes from the first core end face 23a and the second core end face 23b to the space between the insulator inner walls 54 adjacent to each other in the circumferential direction of the rotating shaft 15.

[0077] like Figure 4As shown in the figure, the interphase insulating sheet 46 insulates the first coil ends 32 adjacent to each other in the circumferential direction of the rotating shaft 15 in a state where a portion thereof protrudes from the insulator inner wall 54 of the first insulator 50 to the side opposite to the first core end face 23a. It should be noted that the interphase insulating sheet 46 insulates the second coil ends 33 adjacent to each other in the circumferential direction of the rotating shaft 15 in a state where a portion thereof protrudes from the insulator inner wall 54 of the second insulator 60 to the side opposite to the second core end face 23b, but this is omitted from the figure.

[0078] like Figure 7 As shown, the axial end edge 46e of the rotating shaft 15 in the interphase insulating sheet 46 has a first end edge 461 and a second end edge 462. The first end edge 461 is a portion of the end edge 46e of the interphase insulating sheet 46 that protrudes from the first coil end 32 to the side opposite to the first core end face 23a. The first end edge 461 protrudes from the first coil end 32 to the side opposite to the first core end face 23a. The first end edge 461 protrudes from the inner wall end 54e of the insulator inner wall 54 located on the side opposite to the first core end face 23a to the side opposite to the first core end face 23a. The first end edge 461 is formed by the axial end edge of the rotating shaft 15 in the third insulating portion 49.

[0079] The second end edge 462 is a portion of the end edge 46e of the interphase insulating sheet 46 that does not protrude from the inner wall end 54e of the insulator inner wall 54. In other words, the second end edge 462 is a portion of the end edge 46e of the interphase insulating sheet 46 that has a shorter length than the inner wall end 54e of the insulator inner wall 54. Therefore, the second end edge 462 does not protrude from the inner wall end 54e of the insulator inner wall 54 that is located on the side opposite to the first core end face 23a. The second end edge 462 is located closer to the first core end face 23a than the insulator inner wall 54. The second end edge 462 does not protrude from the first coil end 32 to the side opposite to the first core end face 23a. The second end edge 462 is formed by a portion of the end edge of the third insulating portion 49 that is located closer to the radial inside of the rotating shaft 15 than the portion forming the first end edge 461, and an end edge in the axial direction of the rotating shaft 15 of each of the first insulating portion 47 and the second insulating portion 48. The second end edge 462 is provided from an end E1 of the first end edge 461 located radially inward of the rotating shaft 15 to an end edge of the interphase insulating sheet 46 located radially inward of the rotating shaft 15 .

[0080] <Cover member>

[0081] like Figure 5 As shown, the stator 22 includes a cover member 65 . The cover member 65 is cylindrical. The cover member 65 has insulating properties. The cover member 65 is made of, for example, a resin material. The cover member 65 is disposed to face the first insulator 50 .

[0082] The cover member 65 includes a cover end wall 66, a cover outer wall 67, and a cover inner wall 68. The cover end wall 66 is annular and has a plurality of through holes 65h formed therein.

[0083] The cover end wall 66 has a flat wall 69 and a tapered wall 70. The flat wall 69 is annular. The flat wall 69 is flat. The flat wall 69 extends in the radial direction of the rotating shaft 15. The tapered wall 70 is a tapered shape that is inclined and extends from the inner peripheral portion of the flat wall 69 to the radial inner side of the cover end wall 66. The inner peripheral portion of the tapered wall 70 forms the inner peripheral portion of the cover end wall 66. The outer peripheral portion of the flat wall 69 forms the outer peripheral portion of the cover end wall 66.

[0084] like Figure 8 As shown, the cover end wall 66 is opposed to the first coil end 32 in the axial direction of the rotating shaft 15. The cover end wall 66 covers the first coil end 32 on the side opposite to the first core end face 23a in the axial direction of the rotating shaft 15, and covers a portion of the interphase insulating sheet 46 that protrudes from the insulator inner wall 54 to the side opposite to the first core end face 23a.

[0085] The cover outer wall 67 extends cylindrically from the outer circumference of the flat wall 69 in the axial direction of the rotating shaft 15. Therefore, the cover outer wall 67 extends cylindrically from the outer circumference of the cover end wall 66. The inner diameter of the cover outer wall 67 is larger than the outer diameter of the insulator base 51. The cover outer wall 67 surrounds the insulator base 51 of the first insulator 50.

[0086] The cover inner wall 68 extends cylindrically from the inner circumference of the cone wall 70 toward the axial direction of the rotating shaft 15. Therefore, the cover inner wall 68 extends cylindrically from the inner circumference of the cover end wall 66. The cover inner wall 68 faces the insulator inner walls 54 of the first insulator 50 in the axial direction of the rotating shaft 15. Therefore, the cover inner wall 68 extends from the inner circumference of the cover end wall 66 toward the insulator inner wall 54, and overlaps with the insulator inner wall 54 in the axial direction of the rotating shaft 15. In addition, the cone wall 70 is a cone shape that is inclined so as to approach the insulator inner wall 54 as it approaches the cover inner wall 68. The cone wall 70 is continuous with the cover inner wall 68.

[0087] Here, consider the case where the length of the first coil end 32 in the radial direction of the rotating shaft 15 is divided into three equal parts. The first coil end 32 has an inner diameter portion 32a and an outer diameter portion 32b. The inner diameter portion 32a is the portion located closest to the radial inner side of the rotating shaft 15 when the length of the first coil end 32 in the radial direction of the rotating shaft 15 is divided into three equal parts. The outer diameter portion 32b is the portion of the first coil end 32 located closer to the radial outer side of the rotating shaft 15 than the inner diameter portion 32a.

[0088] The conical wall 70 is inclined from the portion overlapping with the outer diameter portion 32b of the first coil end 32 in the axial direction of the rotating shaft 15 in the cover end wall 66. In more detail, the outer diameter portion 32b has a first outer diameter portion 321b and a second outer diameter portion 322b. The first outer diameter portion 321b is a portion located closest to the radial outer side of the rotating shaft 15 when the length of the first coil end 32 in the radial direction of the rotating shaft 15 is divided into three equal parts in the outer diameter portion 32b. The second outer diameter portion 322b is a portion located closer to the radial inner side of the rotating shaft 15 than the first outer diameter portion 321b in the outer diameter portion 32b. In addition, the conical wall 70 is inclined from the portion overlapping with the second outer diameter portion 322b of the first coil end 32 in the axial direction of the rotating shaft 15 in the cover end wall 66.

[0089] like Fig. 9 As shown in the figure, a limiting portion 71, i.e., a stopper, is provided on the cover end wall 66. The limiting portion 71 protrudes from the inner surface of the cover end wall 66 that is opposite to the first coil end 32. The limiting portion 71 is annular and extends along the circumferential direction of the cover end wall 66. The limiting portion 71 is in the shape of a thin plate. The limiting portion 71 protrudes from the boundary between the flat wall 69 and the conical wall 70 in the cover end wall 66 toward the first coil end 32.

[0090] The restricting portion 71 is configured so that the front end of the restricting portion 71 can contact the end edge 46e of each interphase insulating sheet 46. The front end of the restricting portion 71 can contact the radial center of the rotating shaft 15 at the first end edge 461 of each interphase insulating sheet 46. In this way, the restricting portion 71 contacts the axial end edge 46e of the rotating shaft 15 of the interphase insulating sheet 46. And, the restricting portion 71 restricts the movement of each interphase insulating sheet 46 in the axial direction of the rotating shaft 15 by contacting the axial end edge 46e of the rotating shaft 15 of the interphase insulating sheet 46.

[0091] like Figure 1 As shown, the cover outer wall 67 of the cover member 65 is interposed between the jumper wires 57 of each phase and the peripheral wall 13b of the motor case 13. The cover outer wall 67 of the cover member 65 ensures insulation between the jumper wires 57 of each phase and the motor case 13.

[0092] like Figure 5 As shown, the cover member 65 has a plurality of pairs of locking claws 72. Each pair of locking claws 72 extends from the end edge of the cover outer wall 67 of the cover member 65 on the side opposite to the cover end wall 66 in the axial direction of the yoke 24. The plurality of pairs of locking claws 72 are arranged at equal intervals on the cover outer wall 67 of the cover member 65 in the circumferential direction of the cover outer wall 67. For example, four sets of a pair of locking claws 72 are provided on the cover member 65.

[0093] Each locking claw 72 is in the shape of an elongated flat plate. The longitudinal direction of each locking claw 72 coincides with the axial direction of the yoke 24. Each locking claw 72 extends parallel to each other. The front ends of the locking claws 72 are in the shape of hooks facing each other.

[0094] A pair of locking claws 72 are inserted into each first insertion recess 34. A pair of locking claws 72 are inserted into the first insertion recess 34 in such a manner that the locking protrusion 34f is located between the pair of locking claws 72. Thus, the pair of locking claws 72 are locked to the locking protrusion 34f. In this way, the cover member 65 is mounted on the stator core 23. And, each locking claw 72 is locked to the locking protrusion 34f, so that each locking claw 72 does not fall out of the first insertion recess 34. In this way, the locking of the locking protrusion 34f and each locking claw 72 restricts the movement of the cover member 65 relative to the first insulator 50 along the axial direction of the yoke 24.

[0095] The cover member 65 has a plurality of insertion plate portions 73. Each insertion plate portion 73 extends from an end edge of the cover outer wall 67 of the cover member 65 on the side opposite to the cover end wall 66 toward the axial direction of the yoke 24. The plurality of insertion plate portions 73 are arranged at equal intervals in the circumferential direction of the cover inner wall 68. Each insertion plate portion 73 is in the shape of an elongated plate. The length direction of each insertion plate portion 73 coincides with the length direction of the yoke 24.

[0096] Each insertion plate portion 73 is inserted into each second insertion recess 35. Each insertion plate portion 73 can contact the side surface of each second insertion recess 35 when inserted into each second insertion recess 35. Each insertion plate portion 73 can slide with the side surface of each second insertion recess 35 when the cover member 65 vibrates. The sliding of each insertion plate portion 73 with the side surface of each second insertion recess 35 suppresses the friction between each pair of locking claws 72 and the side surface of each first insertion recess 34.

[0097] like Fig.10 As shown in FIG. 1 , a balancer 74 is provided on the rotating shaft 15. The balancer 74 is plate-shaped. The balancer 74 protrudes radially outward from a portion of the outer peripheral surface of the rotating shaft 15 located on the inner side of the cover inner wall 68. In addition, the balancer 74 offsets the centrifugal force acting on the orbiting scroll 16b due to the rotation of the rotating shaft 15. Therefore, the balancer 74 for offsetting the centrifugal force acting on the orbiting scroll 16b due to the rotation of the rotating shaft 15 is provided on the rotating shaft 15.

[0098] The balancer 74 includes a first extension portion 74a, a second extension portion 74b, and a third extension portion 74c. The first extension portion 74a extends from the outer circumferential surface of the rotating shaft 15 in the radial direction of the rotating shaft 15. The second extension portion 74b extends from the end portion of the first extension portion 74a on the side opposite to the outer circumferential surface of the rotating shaft 15 at an angle relative to the extension direction of the first extension portion 74a. Therefore, the second extension portion 74b extends at an angle relative to the axial direction of the rotating shaft 15. The second extension portion 74b extends from the first extension portion 74a in a direction away from the stator core 23. The third extension portion 74c extends from the end portion of the second extension portion 74b on the side opposite to the first extension portion 74a toward the radial outer side of the rotating shaft 15. The second extension portion 74b of the balancer 74 extends along the conical wall 70. Therefore, the balancer 74 protrudes from the portion of the outer circumferential surface of the rotating shaft 15 located inside the cover inner wall 68 toward the radial outer side of the rotating shaft 15 and extends along the conical wall 70.

[0099] <Airtight terminal>

[0100] like Figure 1 As shown in FIG. 1 , the electric compressor 10 includes an airtight terminal 40. The airtight terminal 40 includes three conductive members 41 corresponding to the coils 28 of each phase. Therefore, the electric compressor 10 includes the conductive member 41. Figure 1 In the figure, only one conductive member 41 is shown. Each conductive member 41 is a cylindrical metal terminal extending in a straight line. The first end of each conductive member 41 is electrically connected to the inverter 17 in the inverter chamber S1. The second end of each conductive member 41 protrudes from the inverter chamber S1 into the motor housing 13 through the hole 13h. In addition, the airtight terminal 40 has a support plate 42. The support plate 42 supports the three conductive members 41 in a mutually insulated state. The support plate 42 is fixed around the hole 13h in the outer surface of the end wall 13a of the motor housing 13 in the inverter chamber S1.

[0101] The stator 22 has a lead wire 43. The lead wire 43 is led out from the motor 20. The lead wire 43 is led out from the second coil end 33 of each coil 28 of each phase. Therefore, three lead wires 43 are led out from the motor 20. Figure 1 In the figure, only one lead 43 is shown.

[0102] The stator 22 includes a block 44. The block 44 accommodates three connection terminals 45 corresponding to the coils 28 of each phase. The block 44 has insulating properties. The block 44 is made of, for example, a resin material. Each connection terminal 45 electrically connects each conductive member 41 and each lead wire 43.

[0103] The power from the inverter 17 is supplied to the motor 20 via the conductive members 41 , the connection terminals 45 , and the lead wires 43 . This drives the motor 20 . Therefore, the inverter 17 drives the motor 20 .

[0104] [Effects of implementation methods]

[0105] Next, the operation of this embodiment will be described.

[0106] like Fig.11 As shown in the figure, such a stator 22 is assembled to the housing 11 by, for example, fitting the stator core 23 into the inner peripheral surface of the peripheral wall 13b of the motor housing 13 by shrink fitting. The shrink fitting is performed by inserting the stator core 23 into a predetermined shrink fitting position in the motor housing 13 after the motor housing 13 is heated and expanded so that the inner diameter of the peripheral wall 13b of the motor housing 13 is larger than the outer diameter of the stator core 23. The shrink fitting is performed by causing the inner peripheral surface of the peripheral wall 13b of the motor housing 13 to be in close contact with the outer peripheral surface of the stator core 23 due to the shrinkage effect accompanying the transfer of the motor housing 13 to normal temperature.

[0107] Therefore, when the stator core 23 is shrink-fitted to the motor housing 13, for example, the stator core 23 is positioned by inserting a jig 75 inside the stator core 23. Then, the motor housing 13 is arranged relative to the stator core 23 in such a manner that the stator core 23, which has been positioned relative to the jig 75, is inserted relative to the inner peripheral surface of the peripheral wall 13b of the motor housing 13 to a predetermined shrink-fit position. In this way, the assembly operation of the stator 22 relative to the housing 11 is performed.

[0108] like Fig.12 As shown in the figure, when the jig 75 used when shrink-fitting the stator core 23 to the motor housing 13 is inserted into the inner side of the stator core 23, the jig 75 is inserted toward the inner side of the stator core 23 while being guided by the tapered wall 70. Therefore, when inserting the jig 75 into the inner side of the stator core 23, the jig 75 is prevented from interfering with the cover member 65 and making it difficult to insert the jig 75 into the inner side of the stator core 23.

[0109] Furthermore, the cover end wall 66 and the cover inner wall 68 prevent the clamp 75 from contacting the first coil end 32 when the clamp 75 is inserted into the inner side of the stator core 23. In addition, the cover end wall 66 and the cover inner wall 68 prevent the clamp 75 from contacting a portion of the interphase insulating sheet 46 that protrudes from the insulator inner wall 54 to the side opposite to the first core end face 23a.

[0110] [Effects of implementation methods]

[0111] The following effects can be obtained in the above-mentioned embodiment.

[0112] (1) The cover end wall 66 has a conical tapered wall 70 that is inclined so as to approach the insulator inner wall 54 as it approaches the cover inner wall 68. The tapered wall 70 is continuous with the cover inner wall 68. Accordingly, when the clamp 75 is inserted into the inner side of the stator core 23 when the stator core 23 is shrink-fitted to the motor housing 13, the clamp 75 is inserted into the inner side of the stator core 23 while being guided by the tapered wall 70. Therefore, it is possible to avoid the problem that when the clamp 75 is inserted into the inner side of the stator core 23, it is difficult to insert the clamp 75 into the inner side of the stator core 23 due to interference between the clamp 75 and the cover member 65. Therefore, it is possible to improve the assembly workability of the stator 22 relative to the housing 11.

[0113] Furthermore, the cover end wall 66 and the cover inner wall 68 prevent the clamp 75 from contacting the first coil end 32 when the clamp 75 is inserted into the inner side of the stator core 23. In addition, the cover end wall 66 and the cover inner wall 68 prevent the clamp 75 from contacting the portion of the interphase insulating sheet 46 that protrudes to the side opposite to the first core end face 23a from the insulator inner wall 54. Thus, it is prevented that the coil 28 is damaged or the interphase insulating sheet 46 is deformed, and the insulation between the first coil ends 32 adjacent to each other in the circumferential direction of the rotating shaft 15 cannot be ensured, thereby improving the reliability of the motor 20. Through the above, it is possible to improve the reliability of the motor 20 while improving the assembly workability of the stator 22 relative to the housing 11.

[0114] (2) The interphase insulating sheet 46 has a structure in which an end edge 46e in the axial direction of the rotating shaft 15 of the interphase insulating sheet 46 protrudes to the side opposite to the first core end face 23a from the first coil end 32. Therefore, insulation between the first coil ends 32 adjacent to each other in the circumferential direction of the rotating shaft 15 is easily ensured. In addition, the interphase insulating sheet 46 has a structure in which an end edge 46e in the axial direction of the rotating shaft 15 of the interphase insulating sheet 46 does not protrude from the inner wall end 54e of the insulator inner wall 54 located on the side opposite to the first core end face 23a. The second end edge 462 is formed by cutting off from the end E1 located on the radial inner side of the rotating shaft 15 of the first end edge 461 to the end edge 46e located on the radial inner side of the rotating shaft 15 of the interphase insulating sheet 46. Therefore, for example, when the entire edge 46e of the interphase insulating sheet 46 protrudes farther than the first coil end 32 and the insulator inner wall 54 to the side opposite to the first core end surface 23a, contact between the clamp 75 and the interphase insulating sheet 46 can be easily avoided.

[0115] (3) The cover end wall 66 is provided with a restriction portion 71 that restricts the movement of the interphase insulating sheet 46 in the axial direction of the rotating shaft 15 by contacting the end edge 46e of the interphase insulating sheet 46 in the axial direction of the rotating shaft 15. According to this, the end edge 46e of the interphase insulating sheet 46 in the axial direction of the rotating shaft 15 contacts the restriction portion 71, so that the movement of the interphase insulating sheet 46 in the axial direction of the rotating shaft 15 can be restricted. Therefore, the interphase insulating sheet 46 can be positioned, and thus the coils 28 adjacent to each other in the circumferential direction of the rotating shaft 15 can be stably insulated by the interphase insulating sheet 46.

[0116] (4) The conical wall 70 is inclined from the portion of the cover end wall 66 that overlaps with the outer diameter portion 32b of the first coil end 32 in the axial direction of the rotating shaft 15. Thus, for example, compared with the case where the conical wall 70 is inclined from the portion of the cover end wall 66 that overlaps with the inner diameter portion 32a of the first coil end 32 in the axial direction of the rotating shaft 15, the inclined length of the conical wall 70 can be made as long as possible. Therefore, when the jig 75 used when shrink-fitting the stator core 23 to the motor housing 13 is inserted into the inside of the stator core 23, the jig 75 can be easily guided into the inside of the stator core 23 by the conical wall 70.

[0117] (5) The balancer 74 protrudes from the portion of the outer circumferential surface of the rotating shaft 15 located inside the cover inner wall 68 to the radially outer side of the rotating shaft 15 and extends along the tapered wall 70. Accordingly, even if the balancer 74 is made to protrude from the portion of the outer circumferential surface of the rotating shaft 15 located inside the cover inner wall 68 to the radially outer side of the rotating shaft 15, since the balancer 74 extends along the tapered wall 70, the balancer 74 does not interfere with the cover member 65. Therefore, the balancer 74 can be made to protrude from the portion of the outer circumferential surface of the rotating shaft 15 located inside the cover inner wall 68 to the radially outer side of the rotating shaft 15. Therefore, the balancer 74 can be arranged as close to the stator core 23 as possible, so that the size of the electric compressor 10 in the axial direction of the rotating shaft 15 can be reduced.

[0118] [Example of change]

[0119] It should be noted that the above-mentioned embodiment can be implemented by modification as follows. The above-mentioned embodiment and the following modification examples can be implemented in combination with each other within the scope of no technical contradiction.

[0120] In the above embodiment, for example, the entire end edge 46 e of the interphase insulating sheet 46 may protrude further than the first coil end 32 and the insulator inner wall 54 to the side opposite to the first core end surface 23 a .

[0121] In the above-described embodiment, the cover member 65 may be configured such that the restricting portion 71 is not provided on the cover end wall 66 .

[0122] In the above embodiment, for example, the tapered wall 70 may be inclined from a portion of the cover end wall 66 that overlaps with the inner diameter portion 32 a of the first coil end 32 in the axial direction of the rotating shaft 15 .

[0123] In the above embodiment, for example, the tapered wall 70 may be inclined from a portion of the cover end wall 66 that overlaps with the first outer diameter portion 321 b of the first coil end 32 in the axial direction of the rotating shaft 15 .

[0124] In the above-described embodiment, the cover inner wall 68 may not overlap with the insulator inner wall 54 in the axial direction of the rotating shaft 15 .

[0125] In the above embodiment, the balancer 74 may protrude radially outward from a portion of the outer peripheral surface of the rotating shaft 15 that is farther from the stator core 23 than the portion located inside the cover inner wall 68 .

[0126] In the above-described embodiment, the electric compressor 10 may be configured such that the balancer 74 is not provided on the rotating shaft 15. In this case, the balancer is provided on a bushing which is an existing structure in the scroll-type compression unit 16, for example.

[0127] In the above embodiment, the cover member 65 may be disposed opposite to the second insulator 60. In this case, the stator core 23 is disposed in the motor housing 13 in such a manner that the first core end face 23a is opposed to the end wall 13a of the motor housing 13 in the axial direction of the rotating shaft 15, and the second core end face 23b is opposed to the shaft support member 18 in the axial direction of the rotating shaft 15. Furthermore, for example, the inverter 17 is disposed radially outside the rotating shaft 15 with respect to the peripheral wall 13b of the motor housing 13, and the block 44 is disposed, for example, between the second insulator 60 and the shaft support member 18.

[0128] In the above-mentioned embodiment, the compression unit 16 is not limited to the scroll type, and may be, for example, a piston type, a vane type, or the like.

[0129] In the above embodiment, the electric compressor 10 is used in a vehicle air conditioner, but the present invention is not limited thereto. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and the compressor 16 may compress air as a fluid supplied to a fuel cell.

Claims

1. An electric compressor, wherein: The electric compressor comprises: Axis of rotation; a compression unit configured to compress a fluid by the rotation of the rotating shaft; a motor configured to rotate the rotating shaft; and a housing having a motor chamber for accommodating the motor, The motor comprises a stator, The stator has: a stator core fixed to the housing; Multi-phase coils formed by winding multi-phase wires around the stator core in a concentrated winding manner and including coil ends protruding from a core end surface of the stator core that is an end surface located in the axial direction of the rotating shaft; an insulator, which is arranged opposite to the end surface of the iron core and insulates the coil from the end surface of the iron core; an interphase insulating sheet extending in a radial direction of the rotating shaft and insulating coils adjacent to each other in a circumferential direction of the rotating shaft; and an insulating cover member disposed opposite to the insulator, The insulator has an insulator inner wall arranged at a position overlapping the coil end inwardly in the radial direction of the rotating shaft. The interphase insulating sheet insulates coil ends adjacent to each other in the circumferential direction in a state where the interphase insulating sheet protrudes from the core end surface and a portion protrudes beyond the inner wall of the insulator to the side opposite to the core end surface. The cover member has: an annular cover end wall covering the coil end on the side opposite to the core end face in the axial direction and covering a portion of the interphase insulating sheet that protrudes from the insulator inner wall to the side opposite to the core end face; and a cylindrical cover inner wall extending from the inner circumference of the cover end wall toward the inner wall of the insulator, The cover end wall has a conical wall inclined so as to approach the inner wall of the insulator as it approaches the inner wall of the cover. The cone wall is continuous with the inner wall of the cover.

2. The electric compressor according to claim 1, wherein: The axial end edge of the interphase insulating sheet has: a first end edge protruding from the coil end to a side opposite to the core end surface; as well as A second end edge is set from the end of the first end edge located on the radial inner side of the rotating shaft to the end edge of the interphase insulating sheet located on the radial inner side, and does not protrude from the inner wall end of the insulator inner wall located on the side opposite to the core end face.

3. The electric compressor according to claim 1 or 2, wherein: The cover end wall is provided with a restriction portion configured to restrict movement of the interphase insulating sheet in the axial direction by contacting an end edge of the interphase insulating sheet in the axial direction.

4. The electric compressor according to claim 1, wherein: The coil end has: an inner diameter portion which is a portion located most inward in the radial direction when the length of the coil end in the radial direction is divided into three equal parts; and an outer diameter portion, which is a portion of the coil end located radially outward of the rotating shaft relative to the inner diameter portion, The tapered wall is inclined from a portion of the cover end wall that overlaps with the outer diameter portion in the axial direction.

5. The electric compressor according to claim 1, wherein: The compression unit comprises: a fixed scroll fixed to the housing; and The revolving scroll is configured to revolve orbitally by the rotation of the rotating shaft while meshing with the fixed scroll. The rotating shaft is provided with a balancer configured to offset the centrifugal force acting on the orbiting scroll due to the rotation of the rotating shaft. The balancer protrudes from a portion of the outer peripheral surface of the rotating shaft located inside the cover inner wall toward the radial outer side of the rotating shaft and extends along the tapered wall.

Images