Electric compressor

Abstract

To improve the reliability of an electric compressor.SOLUTION: Each protrusion 65 is provided on a bottom surface 632U of each U-phase through slot 62U. According to this, compared to the case where, for example, each protruding portion 65 is provided at an end opposite to a stator core 23 in an insulator 50, it becomes easier to secure an engagement allowance for each inserted portion 71 in each protrusion 65. As a result, since each of the protruding portions 65 is stably engaged with each of the inserted portions 71, the attachment of a cover 70 to the insulator 50 is stabilized.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] The electric compressor includes a compression unit, a motor, and a housing. The compression unit compresses a fluid. The motor drives the compression unit. The housing is cylindrical. The housing accommodates the motor. The motor has a stator. The stator includes a cylindrical stator core, a cylindrical insulator, and windings forming a plurality of coils. The stator core is fixed to the housing. The insulator abuts against an end face of the stator core. The windings are wound around the stator core in a concentrated winding manner. The windings include crossover wires that connect the coils in the circumferential direction of the stator core.

[0003] For example, as disclosed in Patent Document 1, an insulator has a guide groove and a through groove. The guide groove is formed on the outer peripheral surface of the insulator. The guide groove extends in the circumferential direction of the insulator. The guide groove guides the jumper wire in the circumferential direction of the insulator. The through groove penetrates the insulator in the radial direction. The through groove opens on the end face of the insulator opposite the stator core, and has a pair of side faces that face each other in the circumferential direction of the insulator, and a bottom face that connects the pair of facing side faces. The through groove guides the jumper wire drawn from the coil into the guide groove. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-109045 Summary of the Invention [Problem to be solved by the invention]

[0005] Such electric compressors may be provided with a cylindrical cover to ensure insulation between the crossover wire and the housing. The cover is interposed between the crossover wire and the housing by surrounding the outer circumferential surface of the insulator. The insulator has a locking portion. The cover has a locked portion to which the locking portion is locked. The cover is attached to the insulator by the locking portion being locked to the locked portion.

[0006] When tension from the jumper wire is applied to the insulator, the insulator deforms so as to bend radially inward from the end of the insulator facing the stator core. Therefore, the amount of radial inward displacement of the insulator is greatest at the end of the insulator opposite the stator core. In this case, for example, if the locking portion is provided at the end of the insulator opposite the stator core, it becomes difficult to ensure an engagement allowance between the locking portion and the locked portion of the cover. This makes it difficult for the locking portion to be locked to the locked portion, which may result in unstable attachment of the cover to the insulator. [Means for solving the problem]

[0007] An electric compressor that solves the above-mentioned problems includes a compression unit that compresses a fluid, a motor that drives the compression unit, and a cylindrical housing that accommodates the motor, the motor includes a stator, the stator includes a cylindrical stator core fixed to the housing, a cylindrical insulator that abuts against an end face of the stator core, and a winding that forms a plurality of coils by being wound around the stator core in a concentrated winding manner, the winding including a crossover wire that connects the coils in a circumferential direction of the stator core, the insulator includes a guide groove that is formed on an outer circumferential surface of the insulator and extends in a circumferential direction of the insulator, the guide groove guiding the crossover wire in the circumferential direction of the insulator, and a guide groove that penetrates the insulator in a radial direction. an insulating tubular cover that surrounds the outer peripheral surface of the insulator and is interposed between the jumper wire and the housing, the insulator having a locking portion and an engaging portion to which the locking portion is locked, the cover being attached to the insulator by the locking portion being locked to the engaging portion, and the locking portion being provided on the bottom surface.

[0008] The amount of radial inward displacement of the insulator caused by tension of the jumper wire applied to the insulator is smaller at the bottom of the through groove than at the end of the insulator opposite the stator core. Therefore, the locking portion is provided at the bottom of the through groove. This makes it easier to ensure the locking portion has sufficient clearance to engage with the locked portion, compared to when the locking portion is provided at the end of the insulator opposite the stator core. As a result, the locking portion is stably locked to the locked portion, stably attaching the cover to the insulator. This improves the reliability of the electric compressor.

[0009] In the above electric compressor, the plurality of coils include a U-phase coil, a V-phase coil, and a W-phase coil, the windings include a U-phase winding that forms the U-phase coil, a V-phase winding that forms the V-phase coil, and a W-phase winding that forms the W-phase coil, the crossover wires include a U-phase crossover wire that is a crossover wire that connects the U-phase coils together in the circumferential direction of the stator core, a V-phase crossover wire that is a crossover wire that connects the V-phase coils together in the circumferential direction of the stator core, and a W-phase crossover wire that is a crossover wire that connects the W-phase coils together in the circumferential direction of the stator core, and the guide grooves include a U-phase guide groove that guides the U-phase crossover wire in the circumferential direction of the insulator, a V-phase guide groove that guides the V-phase crossover wire in the circumferential direction of the insulator, and a W-phase crossover wire that guides the W-phase crossover wire in the insulator. and a W-phase guide groove that guides the U-phase jumper wire drawn from the U-phase coil to the U-phase guide groove, the V-phase guide groove, and the W-phase guide groove are arranged side by side in the axial direction of the insulator, and the through grooves include a U-phase through groove that guides the U-phase jumper wire drawn from the U-phase coil to the U-phase guide groove, a V-phase through groove that guides the V-phase jumper wire drawn from the V-phase coil to the V-phase guide groove, and a W-phase through groove that guides the W-phase jumper wire drawn from the W-phase coil to the W-phase guide groove, and the locking portion is preferably provided on the bottom surface of the U-phase through groove, the V-phase through groove, and the W-phase through groove that has the longest distance from an opening located on the opposite side of the insulator from the stator core to the bottom surface.

[0010] The amount of radial inward displacement of the insulator is smallest at the bottom of the U-phase through-groove, V-phase through-groove, or W-phase through-groove that has the longest distance from its opening located on the opposite side of the insulator from the stator core to its bottom. Therefore, the locking portion is provided at the bottom of the U-phase through-groove, V-phase through-groove, or W-phase through-groove that has the longest distance from its opening located on the opposite side of the insulator from the stator core to its bottom. This further ensures that the locking portion has an engagement margin with the locked portion. As a result, the locking portion is more stably engaged with the locked portion, further stably attaching the cover to the insulator. This further improves the reliability of the electric compressor.

[0011] In the above electric compressor, the locking portion may be a protrusion protruding from the bottom surface, and the locked portion may be an insertion portion formed on the cover and into which the protrusion is inserted.

[0012] An insulator in which the locking portion is a protrusion that protrudes from the bottom surface of the through groove is easy to manufacture, which makes it possible to easily manufacture the electric compressor. [Effects of the Invention]

[0013] According to the present invention, the reliability of the electric compressor can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing an electric compressor according to an embodiment. [Figure 2] FIG. [Figure 3] FIG. 2 is an exploded perspective view showing a stator core and two insulators. [Figure 4] FIG. [Figure 5] FIG. 4 is an enlarged perspective view showing a locking portion. [Figure 6] FIG. 2 is an exploded perspective view of the stator showing a state before the cover is attached to the insulator. [Figure 7] FIG. 2 is a perspective view of the stator showing a state in which the cover is attached to the insulator. [Figure 8] FIG. 4 is an enlarged perspective view showing the relationship between a locking portion and a locked portion. [Figure 9] FIG. 10 is an enlarged perspective view showing a locking portion in another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] An electric compressor according to one embodiment will now be described with reference to Figures 1 to 8. The electric compressor of this embodiment is used in, for example, a vehicle air conditioner. <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.

[0016] 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.

[0017] 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 through hole 13h is formed in the end wall 13a of the motor housing 13. The through hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction. The through hole 13h is located closer to the peripheral wall 13b than the boss portion 13c.

[0018] 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 housed in a motor housing 13. Thus, the housing 11 houses the motor 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.

[0019] The compression unit 16 and the motor 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 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 side by side in this order in the axial direction of the rotating shaft 15.

[0020] The electric compressor 10 includes a shaft support member 18. The shaft support member 18 is disposed between the compression unit 16 and the motor 20. Therefore, the shaft support member 18 serves as a partition wall between the motor 20 and the compression unit 16.

[0021] 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.

[0022] 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 a refrigerant as a fluid. A volume-variable compression chamber S2 is defined between the fixed scroll 16a and the orbiting scroll 16b. A discharge chamber S3 is defined between the fixed scroll 16a and the discharge housing 12. The refrigerant compressed by changing the volume of the compression chamber S2 is discharged into the discharge chamber S3. The motor 20 drives the compression section 16 by rotating the rotary shaft 15.

[0023] <Basic motor configuration> The motor 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.

[0024] The stator 22 includes a cylindrical 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.

[0025] The stator core 23 has a first end face 23a and a second end face 23b. The first end face 23a is an end face located on one axial side of the stator core 23. The second end face 23b is an end face located on the other axial side of the stator core 23. The stator core 23 is disposed within the motor housing 13 so that the first end face 23a faces the shaft support member 18 in the axial direction of the rotating shaft 15 and the second end face 23b faces the end wall 13a of the motor housing 13 in the axial direction of the rotating shaft 15.

[0026] 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.

[0027] The teeth 25 extend from the inner peripheral surface 24a of the yoke 24 in the radial 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.

[0028] 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 end face 23a to the second end face 23b of the stator core 23. The tooth flange portions 27 protrude from the ends of the tooth extension portions 26 opposite the yoke 24 to both sides in the circumferential direction of the stator core 23.

[0029] 2, stator 22 includes a plurality of U-phase coils 28U, a plurality of V-phase coils 28V, and a plurality of W-phase coils 28W. Thus, stator 22 includes a plurality of coils. The plurality of coils includes U-phase coils 28U, V-phase coils 28V, and W-phase coils 28W.

[0030] <Winding> The stator 22 includes a U-phase winding 29U that is wound around the stator core 23 in concentrated winding to form a plurality of U-phase coils 28U. The stator 22 also includes a V-phase winding 29V that is wound around the stator core 23 in concentrated winding to form a plurality of V-phase coils 28V. The stator 22 also includes a W-phase winding 29W that is wound around the stator core 23 in concentrated winding to form a plurality of W-phase coils 28W. Thus, the stator 22 includes windings that form a plurality of coils. The windings include a U-phase winding 29U, a V-phase winding 29V, and a W-phase winding 29W. Portions of the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W pass through slots 30, which are spaces formed between teeth 25 that are adjacent to each other in the circumferential direction of the stator core 23. A slot insulating sheet 31 insulates the stator core 23 from a portion of each of the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W that passes through each slot 30.

[0031] <Airtight terminal> As shown in FIG. 1, the electric compressor 10 includes a hermetic terminal 40. The hermetic terminal 40 includes three conductive members 41 corresponding to the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W. 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 through 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 to the outer surface of the end wall 13a of the motor housing 13 within the inverter chamber S1, around the through hole 13h.

[0032] The electric compressor 10 includes motor wiring 43. The motor wiring 43 is drawn out from the motor 20. The motor wiring 43 is drawn out from the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W at the second end surface 23b side of the stator core 23. One motor wiring 43 is drawn out from the motor 20, one for each phase. Therefore, three motor wirings 43 are drawn out from the motor 20. Note that only one motor wiring 43 is shown in FIG. 1 .

[0033] A connector 44 is housed within the motor housing 13. The connector 44 is disposed between the second end surface 23b of the stator core 23 and the end wall 13a of the motor housing 13. The connector 44 includes three connection terminals 45 corresponding to the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W, and an insulating cluster block 46 that houses the three connection terminals 45.

[0034] The cluster block 46 has three conductive member insertion holes 47 and three motor wire insertion holes 48. Note that FIG. 1 illustrates only one conductive member insertion hole 47 and one motor wire insertion hole 48. A conductive member 41 is inserted into each conductive member insertion hole 47. A motor wire 43 is inserted into each motor wire insertion hole 48. Each connection terminal 45 electrically connects each conductive member 41 to each motor wire 43. The cluster block 46 is disposed within the motor housing 13 so that the conductive member insertion holes 47 extend in the axial direction of the rotating shaft 15.

[0035] Electric power from the inverter 17 is supplied to the motor 20 via the conductive members 41, the connection terminals 45, and the motor wiring 43. This drives the motor 20. Therefore, the inverter 17 drives the motor 20. Then, the driving of the motor 20 drives the compression unit 16, and the compression unit 16 compresses the refrigerant.

[0036] <Insulator> 1, the stator 22 includes two insulators 50. Each insulator 50 is cylindrical. Each insulator 50 is made of, for example, a resin material. Each insulator 50 insulates the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W from the stator core 23.

[0037] As shown in FIG. 3 , each insulator 50 has an insulator base 51 and a plurality of insulator teeth 52. The insulator base 51 is cylindrical. Each insulator 50 is disposed relative to the stator core 23 with the axis of the insulator base 51 aligned with the axis of the yoke 24. One of the two insulators 50 is disposed relative to the stator core 23 with the insulator base 51 abutting against the first end face 23 a of the stator core 23. The other of the two insulators 50 is disposed relative to the stator core 23 with the insulator base 51 abutting against the second end face 23 b of the stator core 23. Therefore, each insulator 50 abuts against the 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.

[0038] Each insulator tooth 52 extends from the inner circumferential surface 51a of the insulator base 51 in the radial direction 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 insulator 50 has 15 insulator teeth 52. The number of insulator teeth 52 is the same as the number of teeth 25 of the stator core 23.

[0039] Each insulator tooth portion 52 has an insulator extension portion 53 and an insulator flange portion 54. The insulator extension portion 53 is columnar and extends from the inner circumferential surface 51a of the insulator base portion 51. The circumferential width of each insulator extension portion 53 of the insulator base portion 51 is the same as the circumferential width of each tooth extension portion 26 of the stator core 23. Each insulator extension portion 53 is in contact with each tooth 25. The insulator flange portion 54 protrudes along the insulator base portion 51 from the end of the insulator extension portion 53 opposite the insulator base portion 51.

[0040] <Guide groove> Of the two insulators 50, the insulator 50 that abuts against the first end surface 23a of the stator core 23 has a U-phase guide groove 61U, a V-phase guide groove 61V, and a W-phase guide groove 61W. The U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W are arranged side by side in the axial direction of the insulator 50. The U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W are formed on the outer circumferential surface of the insulator base 51. Therefore, the U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W are formed on the outer circumferential surface of the insulator 50. The U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W extend in the circumferential direction of the insulator 50. The U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W do not penetrate the insulator base portion 51.

[0041] The U-phase guide groove 61U is disposed at a position farther away from the end face 50e of the insulator 50 opposite the stator core 23 in the axial direction of the insulator 50 than the V-phase guide groove 61V and the W-phase guide groove 61W. The V-phase guide groove 61V is disposed at a position farther away from the end face 50e of the insulator 50 opposite the stator core 23 in the axial direction of the insulator 50 than the W-phase guide groove 61W. Therefore, of the U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W, the U-phase guide groove 61U is disposed at a position farthest away from the end face 50e of the insulator 50 opposite the stator core 23 in the axial direction of the insulator 50.

[0042] <Through groove> 3 and 4, of the two insulators 50, the insulator 50 that abuts against the first end surface 23a of the stator core 23 has five U-phase through grooves 62U, five V-phase through grooves 62V, and five W-phase through grooves 62W. Each of the U-phase through grooves 62U, five V-phase through grooves 62V, and five W-phase through grooves 62W penetrates the insulator 50 in the radial direction.

[0043] 5, each U-phase through-groove 62U opens to an end surface 50e of the insulator 50 opposite the stator core 23, and has a pair of side surfaces 631U and a bottom surface 632U. The pair of side surfaces 631U face each other in the circumferential direction of the insulator 50. The bottom surface 632U connects the pair of facing side surfaces 631U. The bottom surface 632U of the U-phase through-groove 62U is flush with and continuous with the U-phase guide groove 61U.

[0044] 5, each V-phase through groove 62V and each W-phase through groove 62W has a pair of side surfaces and a bottom surface, similar to the U-phase through groove 62U. The bottom surface of the V-phase through groove 62V is flush and continuous with the V-phase guide groove 61V. The bottom surface of the W-phase through groove 62W is flush and continuous with the W-phase guide groove 61W. Therefore, among the U-phase through groove 62U, the V-phase through groove 62V, and the W-phase through groove 62W, each U-phase through groove 62U is the through groove with the longest distance from an opening located on the side of the insulator 50 opposite the stator core 23 to the bottom surface 632U.

[0045] <Coil> As shown in FIG. 4 , U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W are formed by serial winding. In serial winding, U-phase winding 29U, V-phase winding 29V, and W-phase winding 29W are first wound around each tooth extension 26 and insulator extension 53 of each insulator 50. Then, U-phase winding 29U, V-phase winding 29V, and W-phase winding 29W are sequentially wound in concentrated winding around tooth extensions 26 and insulator extensions 53 of each insulator 50 that are arranged every third tooth extension 26 in the circumferential direction of stator core 23. Therefore, U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W are arranged every third tooth extension 26 in the circumferential direction of stator core 23. In this embodiment, five U-phase coils 28U, V-phase coils 28V, and W-phase coils 28W are arranged. The U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W are arranged in each slot 30 such that coils of different phases are adjacent to each other in the circumferential direction of the stator core 23.

[0046] <Crossover> U-phase winding 29U includes a U-phase crossover wire 64U that is a crossover wire that connects U-phase coils 28U to each other in the circumferential direction of stator core 23. U-phase crossover wire 64U is pulled out from a portion of U-phase coil 28U on the side of first end face 23a of stator core 23 and is guided by U-phase guide groove 61U via U-phase through groove 62U. Therefore, U-phase guide groove 61U is a guide groove that guides U-phase crossover wire 64U in the circumferential direction of insulator 50. U-phase through groove 62U is a through groove that guides U-phase crossover wire 64U, pulled out from U-phase coil 28U, into U-phase guide groove 61U.

[0047] V-phase winding 29V includes a V-phase crossover wire 64V that is a crossover wire connecting V-phase coils 28V to each other in the circumferential direction of stator core 23. V-phase crossover wire 64V is drawn out from a portion of V-phase coil 28V on the first end face 23a side of stator core 23 and is guided into V-phase guide groove 61V via V-phase through groove 62V. Therefore, V-phase guide groove 61V is a guide groove that guides V-phase crossover wire 64V in the circumferential direction of insulator 50. V-phase through groove 62V is a through groove that guides V-phase crossover wire 64V drawn out from V-phase coil 28V into V-phase guide groove 61V.

[0048] W-phase winding 29W includes a W-phase crossover wire 64W that is a crossover wire connecting W-phase coils 28W together in the circumferential direction of stator core 23. W-phase crossover wire 64W is pulled out from a portion of W-phase coil 28W on the first end face 23a side of stator core 23 and is guided by W-phase guide groove 61W via W-phase through groove 62W. Therefore, W-phase guide groove 61W is a guide groove that guides W-phase crossover wire 64W in the circumferential direction of insulator 50. W-phase through groove 62W is a through groove that guides W-phase crossover wire 64W pulled out from W-phase coil 28W into W-phase guide groove 61W.

[0049] As such, the windings include crossover wires that connect the coils together in the circumferential direction of the stator core 23. The crossover wires include a U-phase crossover wire 64U, a V-phase crossover wire 64V, and a W-phase crossover wire 64W. The insulator 50 has guide grooves that guide the crossover wires in the circumferential direction of the insulator 50. The guide grooves include a U-phase guide groove 61U, a V-phase guide groove 61V, and a W-phase guide groove 61W. The insulator 50 has through grooves that guide the crossover wires drawn out from the coils into the guide grooves. The through grooves include a U-phase through groove 62U, a V-phase through groove 62V, and a W-phase through groove 62W.

[0050] U-phase crossover wire 64U, V-phase crossover wire 64V, and W-phase crossover wire 64W are located on the opposite side of stator core 23 from each motor wire 43. U-phase guide groove 61U, V-phase guide groove 61V, and W-phase guide groove 61W guide U-phase crossover wire 64U, V-phase crossover wire 64V, and W-phase crossover wire 64W in the circumferential direction of insulator 50 on the opposite side of stator core 23 from each motor wire 43.

[0051] <Latching part> 5, of the two insulators 50, the insulator 50 that abuts against the first end surface 23a of the stator core 23 has a plurality of protrusions 65 as locking portions. Each protrusion 65 is provided on the bottom surface 632U of each U-phase through groove 62U. Therefore, each protrusion 65 is provided on the bottom surface of the through groove that has the longest distance from the opening located on the opposite side of the insulator 50 from the stator core 23, among the U-phase through groove 62U, the V-phase through groove 62V, and the W-phase through groove 62W. In this way, each protrusion 65 is provided on the bottom surface of the through groove.

[0052] Each protrusion 65 protrudes from the bottom surface 632U of the corresponding U-phase through groove 62U. Therefore, in this embodiment, the locking portions are the protrusions 65 protruding from the bottom surface 632U of the corresponding U-phase through groove 62U. Each protrusion 65 protrudes from the bottom surface 632U of the corresponding U-phase through groove 62U toward the radially outer side of the insulator 50. Each protrusion 65 protrudes radially outward from the insulator 50 beyond the outer circumferential surface of the insulator base 51. Each protrusion 65 has a quadrangular prism shape. The surface of the tip of each protrusion 65 located opposite the stator core 23 forms a tapered surface 65a that gradually slopes toward the stator core 23 as it approaches the tip of each protrusion 65.

[0053] <Cover> As shown in FIGS. 6 and 7 , the electric compressor 10 includes a cover 70. The cover 70 is cylindrical. The cover 70 is insulating. The cover 70 is made of, for example, a resin material. The inner diameter of the cover 70 is larger than the outer diameter of the insulator base 51. As shown in FIG. 1 , the cover 70 surrounds the outer peripheral surface of the insulator 50, of the two insulators 50, that abuts against the first end surface 23a of the stator core 23. As a result, the cover 70 is interposed between the U-phase crossover wire 64U, the V-phase crossover wire 64V, and the W-phase crossover wire 64W and the peripheral wall 13b of the motor housing 13. The cover 70 ensures insulation between the U-phase crossover wire 64U, the V-phase crossover wire 64V, and the W-phase crossover wire 64W and the motor housing 13.

[0054] <Locked part> As shown in Figures 6 and 7, the cover 70 has a plurality of inserted portions 71 as interlocking portions. The inserted portions 71 are holes that penetrate the cover 70. Each of the protrusions 65 can be inserted into the inserted portions 71. Therefore, in this embodiment, the interlocking portions are the inserted portions 71 that are formed on the cover 70 and into which each of the protrusions 65 is inserted. The multiple inserted portions 71 are arranged on the cover 70 at positions corresponding to each of the protrusions 65.

[0055] As shown in Fig. 8, the insertion portion 71 has a rectangular hole shape. When the protrusions 65 are inserted into the insertion portion 71, the protrusions 65 are locked to the insertion portion 71. Therefore, the protrusions 65 are locked to the insertion portion 71. When each protrusion 65 is locked to each insertion portion 71, the cover 70 is attached to the insulator 50. Contact between each protrusion 65 and each insertion portion 71 restricts axial movement of the insulator 50 relative to the insulator 50 in the cover 70 and circumferential movement of the insulator 50 relative to the insulator 50 in the cover 70.

[0056] When attaching the cover 70 to the insulator 50, first, the inner peripheral edge of the cover 70 is brought into contact with the tapered surfaces 65a of the protrusions 65. Then, the cover 70 is forcibly pressed against the insulator 50 toward the first end surface 23a of the stator core 23. At this time, the tapered surfaces 65a of the protrusions 65 reduce interference between the inner peripheral edge of the cover 70 and the tip ends of the protrusions 65. Then, the protrusions 65 are inserted into the insertion portions 71, thereby attaching the cover 70 to the insulator 50.

[0057] [Operation of the embodiment] Next, the operation of this embodiment will be described. Tension from the U-phase crossover wire 64U, the V-phase crossover wire 64V, and the W-phase crossover wire 64W is applied to the insulator 50. As a result, the insulator 50 is deformed so as to bend radially inward, starting from the end of the insulator 50 on the stator core 23 side. Therefore, the amount of radially inward displacement of the insulator 50 is greatest at the end of the insulator 50 opposite the stator core 23.

[0058] The amount of radial inward displacement of the insulator 50 is smaller at the bottom surface 632U of the U-phase through-groove 62U than at the end of the insulator 50 on the opposite side from the stator core 23. The amount of displacement is smallest at the bottom surface 632U of the U-phase through-groove 62U, which has the longest distance from the opening located on the opposite side from the stator core 23 of the insulator 50 among the U-phase through-groove 62U, the V-phase through-groove 62V, and the W-phase through-groove 62W.

[0059] Therefore, each protrusion 65 is provided on the bottom surface 632U of each U-phase through groove 62U. This makes it easier to ensure an engagement allowance for each protrusion 65 with each inserted portion 71 compared to, for example, a case where the protrusion 65 is provided on the end of the insulator 50 opposite the stator core 23. As a result, each protrusion 65 is stably engaged with each inserted portion 71, and therefore, attachment of the cover 70 to the insulator 50 is stable.

[0060] [Effects of the embodiment] The above embodiment can provide the following effects. (1) Each protrusion 65 is provided on the bottom surface 632U of each U-phase through groove 62U. This makes it easier to ensure an engagement allowance for each protrusion 65 with each inserted portion 71 compared to, for example, a case where each protrusion 65 is provided on the end of the insulator 50 opposite the stator core 23. As a result, each protrusion 65 is stably engaged with each inserted portion 71, and therefore, attachment of the cover 70 to the insulator 50 is stable. This improves the reliability of the electric compressor 10.

[0061] (2) Each protrusion 65 is provided on the bottom surface 632U of the U-phase through groove 62U, the V-phase through groove 62V, and the W-phase through groove 62W, which has the longest distance from the opening located on the opposite side of the insulator 50 from the stator core 23 to the bottom surface. This makes it easier to ensure that each protrusion 65 has an engagement margin with each inserted portion 71. As a result, each protrusion 65 is more stably engaged with the inserted portion 71, and therefore, attachment of the cover 70 to the insulator 50 is more stable. This further improves the reliability of the electric compressor 10.

[0062] (3) The insulator 50 in which the locking portion is the protrusion 65 that protrudes from the bottom surface 632U of the U-phase through-groove 62U is easy to manufacture, which makes it possible to easily manufacture the electric compressor 10.

[0063] (4) Each protrusion 65 is provided on the bottom surface 632U of each U-phase through groove 62U. Therefore, compared to, for example, a case where protrusion 65 is provided on a wall portion that forms U-phase guide groove 61U in which U-phase crossover wire 64U is guided, it is easier to ensure the insulation distance between U-phase crossover wire 64U and housing 11 via inserted portion 71.

[0064] (5) Each protrusion 65 is provided on the bottom surface 632U of each U-phase through groove 62U. Therefore, for example, there is no need to provide a protrusion 65 in a portion of the insulator base 51 between the U-phase guide groove 61U and the stator core 23. Therefore, there is no need to ensure space for providing a protrusion 65 in a portion of the insulator base 51 between the U-phase guide groove 61U and the stator core 23, which makes it possible to reduce the size of the insulator 50. As a result, the size of the electric compressor 10 can be reduced.

[0065] [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.

[0066] 9 , for example, the bottom surface 632U of the U-phase through groove 62U may not be flush with and continuous with the U-phase guide groove 61U, and there may be a step between the bottom surface 632U of the U-phase through groove 62U and the U-phase guide groove 61U. The bottom surface 632U of the U-phase through groove 62U is continuous with the U-phase guide groove 61U via parts of a pair of side surfaces 631U. The bottom surface 632U of the U-phase through groove 62U is located closer to the stator core 23 than the U-phase guide groove 61U.

[0067] In the embodiment shown in FIG. 9, the protrusion 65 may be provided on the insulator 50 in a state in which it is in contact with both a portion of one of the pair of side surfaces 631U and the bottom surface 632U. In the embodiment, for example, the protrusion 65 may be provided on the bottom surface of the V-phase through groove 62V or the bottom surface of the W-phase through groove 62W. In this case, the position of the inserted portion 71 relative to the cover 70 needs to be changed appropriately according to the position of the protrusion 65.

[0068] In the embodiment, the inserted portion 71 may be a recess that does not penetrate the cover 70. In short, the inserted portion 71 may be a locking portion that is formed on the cover 70 and into which the protrusion 65 is inserted to lock the protrusion 65.

[0069] In the embodiment, for example, a hole portion serving as an engaging portion may be provided in the bottom surface 632U of each U-phase through groove 62U, and a protrusion portion to be inserted into the hole may be provided on the cover 70. In other words, the concave-convex relationship between the engaging portion and the engaged portion may be reversed.

[0070] In the above embodiment, the arrangement order of the U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W in the axial direction of the insulator 50 may be changed as appropriate. In the above embodiment, the surface of the tip of each protrusion 65 that is located on the side opposite to the stator core 23 does not have to be the tapered surface 65a.

[0071] In the embodiment, of the two insulators 50, the insulator 50 that abuts against the second end surface 23b of the stator core 23 may have the U-phase guide groove 61U, the V-phase guide groove 61V, and the W-phase guide groove 61W. In this case, of the two insulators 50, the insulator 50 that abuts against the second end surface 23b of the stator core 23 has the U-phase through groove 62U, the V-phase through groove 62V, and the W-phase through groove 62W. The U-phase crossover wire 64U, the V-phase crossover wire 64V, and the W-phase crossover wire 64W are located on the side of the stator core 23 that faces the motor wiring 43. In this manner, U-phase guide groove 61U, V-phase guide groove 61V, and W-phase guide groove 61W may guide U-phase crossover wire 64U, V-phase crossover wire 64V, and W-phase crossover wire 64W in the circumferential direction of insulator 50 on the side of each motor wiring 43 with respect to stator core 23. In this case, cover 70 surrounds the outer peripheral surface of the insulator 50 of the two insulators 50 that abuts against second end surface 23b of stator core 23. As a result, cover 70 is interposed between U-phase crossover wire 64U, V-phase crossover wire 64V, and W-phase crossover wire 64W and peripheral wall 13b of motor housing 13.

[0072] In the above-described embodiment, the compression unit 16 is not limited to a scroll type, but may be, for example, a piston type or a vane type. In the above embodiment, the electric compressor 10 is used in a vehicle air 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]

[0073] 10...electric compressor, 11...housing, 16...compression section, 20...motor, 22...stator, 23...stator core, 23a...first end face which is an end face, 23b...second end face which is an end face, 28U...U-phase coil which is a coil, 28V...V-phase coil which is a coil, 28W...W-phase coil which is a coil, 29U...U-phase winding which is a winding, 29V...V-phase winding which is a winding, 29W...W-phase winding which is a winding, 50...insulator, 50e...end face, 61U...plan U-phase guide groove which is an inner groove, 61V...V-phase guide groove which is a guide groove, 61W...W-phase guide groove which is a guide groove, 62U...U-phase through groove which is a through groove, 62V...V-phase through groove which is a through groove, 62W...W-phase through groove which is a through groove, 64U...U-phase jumper wire which is a jumper wire, 64V...V-phase jumper wire which is a jumper wire, 64W...W-phase jumper wire which is a jumper wire, 65...protrusion portion which serves as a locking portion, 70...cover, 71...inserted portion which serves as a locked portion, 631U...side surface, 632U...bottom surface.

Claims

1. a compression section that compresses the fluid; a motor that drives the compression unit; a cylindrical housing that accommodates the motor, the motor includes a stator; The stator includes: a cylindrical stator core fixed to the housing; a cylindrical insulator abutting against an end surface of the stator core; a winding wound around the stator core in a concentrated winding manner to form a plurality of coils; the winding includes a crossover wire connecting the coils together in the circumferential direction of the stator core, The insulator is a guide groove formed on an outer peripheral surface of the insulator, extending in a circumferential direction of the insulator, and guiding the crossover wire in the circumferential direction of the insulator; a through groove that penetrates the insulator in a radial direction and opens at an end face of the insulator opposite to the stator core, thereby including a pair of side faces that face each other in a circumferential direction of the insulator and a bottom face that connects the pair of facing side faces, and that guides the crossover wire drawn from the coil to the guide groove; an insulating cylindrical cover that surrounds an outer peripheral surface of the insulator and is interposed between the crossover wire and the housing; the insulator has a locking portion, the cover has a locked portion to which the locking portion is locked, an electric compressor in which the cover is attached to the insulator by the engaging portion being engaged with the engaged portion, The electric compressor, wherein the locking portion is provided on the bottom surface.

2. the plurality of coils include a U-phase coil, a V-phase coil, and a W-phase coil, the windings include a U-phase winding that forms the U-phase coil, a V-phase winding that forms the V-phase coil, and a W-phase winding that forms the W-phase coil, the crossover wires include U-phase crossover wires that connect the U-phase coils together in the circumferential direction of the stator core, V-phase crossover wires that connect the V-phase coils together in the circumferential direction of the stator core, and W-phase crossover wires that connect the W-phase coils together in the circumferential direction of the stator core, the guide grooves include a U-phase guide groove that guides the U-phase crossover wire in the circumferential direction of the insulator, a V-phase guide groove that guides the V-phase crossover wire in the circumferential direction of the insulator, and a W-phase guide groove that guides the W-phase crossover wire in the circumferential direction of the insulator, the U-phase guide groove, the V-phase guide groove, and the W-phase guide groove are arranged side by side in the axial direction of the insulator, the through grooves include a U-phase through groove that guides the U-phase jumper wire drawn from the U-phase coil to the U-phase guide groove, a V-phase through groove that guides the V-phase jumper wire drawn from the V-phase coil to the V-phase guide groove, and a W-phase through groove that guides the W-phase jumper wire drawn from the W-phase coil to the W-phase guide groove, 2. The electric compressor according to claim 1, wherein the locking portion is provided on the bottom surface of the through groove that has the longest distance from an opening located on the opposite side of the insulator from the stator core to the bottom surface, among the U-phase through groove, the V-phase through groove, and the W-phase through groove.

3. the locking portion is a protrusion protruding from the bottom surface, 3. The electric compressor according to claim 1, wherein the engagement portion is an insertion portion formed on the cover and into which the protrusion is inserted.

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