Motor compressor

Abstract

To ensure insulation between a lead of each phase and a coil end while reducing the size of a motor compressor in an axial direction of a rotational shaft, and to cool coils.SOLUTION: Refrigerant sucked into a motor chamber flows toward a second coil end 33 via each through-hole 92. Thus, a U-phase coil 28U, a V-phase coil 28 V, and a W-phase coil 28 W are cooled efficiently by the refrigerant. On a cover end surface 71, a first surface 81 is arranged at a position more distant from the second coil end 33 than a second surface 82 is. An insulation distance between an extension portion 78 arranged on the first surface 81 and the second coil end 33 via the through-hole 92 is elongated. By effectively utilizing a space created by the second surface 82 brought closer to the second coil end 33 than the first surface 81 is, the size of a motor compressor in an axial direction of a rotational shaft 15 is reduced.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

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

[0003] The motor includes a stator. The stator includes a stator core, multiple phase coils, and an insulator. The stator core is fixed to a housing. The coils for each phase are formed by winding multiple phase windings around the stator core in a concentrated winding manner. The insulator is disposed against a core end face located in the axial direction of the rotation shaft of the stator core. The insulator provides insulation between the coils and the core end face.

[0004] The motor includes coil ends, lead wires, and a neutral point connection portion. The coil ends are part of the coils of each phase and protrude from the core end face. The lead wires are part of the windings of each phase and are respectively drawn out from the coil ends of each phase. The neutral point connection portion constitutes a neutral point by electrically connecting the ends of the lead wires of each phase to each other.

[0005] The neutral point connection part may be fixed to the coil end by, for example, tying it with a fixing thread. However, in this case, a process of tying the neutral point connection part to the coil end with the fixing thread is required. Therefore, this is not preferable because the work process becomes complicated.

[0006] In view of this, an electric compressor is known that includes a housing member that houses a neutral point connection portion, as shown in, for example, Patent Document 1. This simplifies the work process because it does not require a process of fastening the neutral point connection portion to the coil end with a fixing thread. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-129944 A Summary of the Invention [Problem to be solved by the invention]

[0008] In such an electric compressor, the stator may include an insulating cover member disposed on the opposite side of the coil end from the core end face in the axial direction of the rotating shaft. The cover member has a cover end face located on the opposite side of the coil end in the axial direction of the rotating shaft. An insulating storage section that stores the neutral point connection part is provided on the cover end face. This allows the electric compressor to be made smaller in size in the radial direction of the rotating shaft than when the storage section that stores the neutral point connection part is provided, for example, on the outer periphery of the insulator.

[0009] The windings include a conductor wire and a coating applied to the outer periphery of the conductor wire. In order to ensure insulation, the outer periphery of the coating of the winding wire of each phase is covered with, for example, a tubular resin insulating member. Thus, the outer periphery of the coating of the lead wire of each phase has a coating portion that is covered with an insulating member.

[0010] In addition, as described above, when the neutral point connection portion is stored in an insulating storage portion, it is possible to ensure the insulation of the neutral point connection portion by, for example, pouring resin into the storage portion and hardening it to seal the storage portion with resin. In this case, for example, if the portion of the lead wire of each phase located in the storage portion is covered with an insulating material, the resin poured into the storage portion may not easily adhere to the insulating material, and it may be difficult to seal the storage portion with resin. Therefore, an insulating material is not arranged in the lead wire of each phase, at least in the portion including the neutral point connection portion and located in the storage portion. Furthermore, in consideration of the error in the design dimensions of the storage portion, it is possible that an insulating material is not arranged in the lead wire of each phase, even in the portion extending from the storage portion to the outside of the storage portion by a predetermined length. In this way, the lead wire of each phase may have a non-covered portion that does not have an insulating material arranged therein, includes the neutral point connection portion, and has an extension portion that is a portion that is continuous with the neutral point connection portion and extends from the storage portion to the outside of the storage portion by a predetermined length. With this, even if there is an error in the design dimensions of the storage section, the portions of the lead wires of each phase that are positioned within the storage section can be reliably inserted as non-covered portions that are not covered by insulating material, and the inside of the storage section can be reliably sealed with resin.

[0011] Since the coil generates heat, it is desirable to cool it with the fluid in the motor chamber. However, if the cover member is disposed on the opposite side of the coil end from the end face of the stator core in the axial direction of the rotating shaft, the cover member may block the flow of the fluid drawn into the motor chamber toward the coil end. To solve this problem, for example, a through hole may be formed in the end face of the cover. In this way, the fluid drawn into the motor chamber flows toward the coil end through the through hole, so that the coil can be efficiently cooled by the fluid.

[0012] However, in the cover end face, a through hole may be formed at least in the storage section and the first surface where the extension portion of the lead wire of each phase is arranged. In this case, since an insulating member is not arranged on the extension portion of the lead wire of each phase, there is a risk of poor insulation between the extension portion and the coil end through the through hole. Therefore, in order to ensure an insulation distance between the extension portion and the coil end through the through hole, it is necessary to separate the cover end face from the coil end as much as possible. However, there is a risk that the size of the electric compressor will increase in the axial direction of the rotating shaft by the amount of separation of the cover end face from the coil end. Therefore, there is a demand for an electric compressor that can ensure insulation between the lead wire of each phase and the coil end and cool the coil while minimizing the size of the electric compressor in the axial direction of the rotating shaft. [Means for solving the problem]

[0013] The electric compressor that solves the above problem includes a rotating shaft, a compression unit that compresses a fluid by rotation of the rotating shaft, a motor that rotates the rotating shaft, and a housing having a motor chamber that accommodates the motor and into which fluid is drawn, the motor including a stator, the stator including a stator core fixed to the housing, multiple phase coils formed by winding multiple phase windings around the stator core in a concentrated winding manner, an insulator that is disposed against a core end face of the stator core located in the axial direction of the rotating shaft and provides insulation between the coils and the core end face, coil ends that are part of the coils of each phase and protrude from the core end face, lead wires that are part of the windings of each phase and are respectively drawn out from the coil ends of each phase, a neutral point connection portion that constitutes a neutral point by electrically connecting ends of the lead wires of each phase, and a neutral point connection portion that is opposite in the axial direction to the coil ends and the core end face. an insulating cover member arranged on the opposite side of the coil end, the winding having a conductor and a coating applied to an outer circumferential side of the conductor, the cover member having a cover end face located on the opposite side of the coil end in the axial direction, the cover end face being provided with an insulating storage section that stores the neutral point connection section, the lead wires of each phase having a covered section in which an outer circumferential side of the coating is covered with an insulating material, and an uncovered section in which the insulating material is not arranged, the uncovered section including the neutral point connection section, and having an extension section that is continuous with the neutral point connection section and extends from the storage section to outside the storage section by a predetermined length, the cover end face having a first surface on which the storage section and the extension section are arranged, and a second surface that is different from the first surface, at least the first surface having a through hole that allows a fluid drawn into the motor chamber to flow toward the coil end, and the first surface is arranged at a position farther from the coil end than the second surface.

[0014] According to this, the fluid sucked into the motor chamber flows toward the coil end through the through hole, so that the coil can be efficiently cooled by the fluid. Also, since the first surface is disposed at a position farther from the coil end than the second surface at the end surface of the cover, the insulation distance between the extension portion disposed on the first surface and the coil end through the through hole can be increased. Therefore, it is possible to suppress insulation failure between the extension portion and the coil end through the through hole. And, by effectively utilizing the space generated by the second surface being closer to the coil end than the first surface, it is possible to reduce the size of the electric compressor in the axial direction of the rotating shaft. As described above, it is possible to ensure insulation between the lead wires of each phase and the coil end and to cool the coil while reducing the size of the electric compressor in the axial direction of the rotating shaft. Here, the winding and the lead wires, which are a part of the winding, are, for example, enamel-coated on the outer periphery of the conductor, and the insulating member covers the outer periphery of the lead wire.

[0015] The above electric compressor comprises an inverter that drives the motor, and a conductive member electrically connected to the inverter, and the stator comprises lead wires drawn out from the coil ends of each phase, and an insulating cluster block that houses connection terminals that electrically connect the conductive member and the lead wires, and the cluster block is preferably positioned relative to the cover member in a position that does not overlap with the storage portion in the axial direction.

[0016] With this, the cluster block can be disposed as close as possible to the coil end compared to a case where the cluster block is disposed in a position relative to the cover member that overlaps with the storage portion in the axial direction of the rotating shaft, thereby making it possible to further reduce the size of the electric compressor in the axial direction of the rotating shaft.

[0017] In the above electric compressor, the cover member may have an insulating wall portion that covers the extension portion from a radial outside of the rotating shaft. According to this, the insulating wall portion can ensure insulation between, for example, the extension portion and the housing. Therefore, since the cover member has the insulating wall portion, the insulation of the lead wires of each phase can be further ensured.

[0018] In the above electric compressor, the first surface and the second surface are flat surfaces extending parallel to each other, and the cover end surface has a connecting surface connecting the first surface and the second surface, and the connecting surface is tapered and extends obliquely relative to the first surface and the second surface.

[0019] According to this, since the connection surface is tapered and extends obliquely relative to the first and second surfaces, the lead wires of each phase can be extended without excessive bending of the portions of the lead wires of each phase that extend between the first and second surfaces. Therefore, the load applied to the lead wires of each phase can be suppressed, and the durability of the lead wires of each phase can be improved.

[0020] In the above electric compressor, the cover member may have a restricting portion that restricts movement of the covering portion in a direction away from the second surface. According to this, the restricting portion can bring the covering portion of each phase arranged on the second surface as close as possible to the second surface. Therefore, the covering portion of each phase arranged on the second surface can be arranged as close as possible to the coil end. Therefore, the electric compressor can be further downsized in the axial direction of the rotating shaft. Effect of the Invention

[0021] According to this invention, it is possible to reduce the size of the electric compressor in the axial direction of the rotating shaft, while ensuring insulation between the lead wires of each phase and the coil ends, and cooling the coils. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a cross-sectional view showing an electric compressor according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the motor. [Diagram 3] FIG. 3 is an exploded perspective view showing the stator core and two insulators. [Figure 4] FIG. 4 is a perspective view of the stator showing a state before the cover is attached to the insulator. [Diagram 5] FIG. 5 is a perspective view of the stator showing a state in which the cover is attached to the insulator. [Figure 6] FIG. 6 is a perspective view of the stator. [Figure 7] FIG. 7 is an enlarged perspective view of a portion of the stator. [Figure 8] FIG. 8 is a cross-sectional view showing the storage section and its interior. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An electric compressor according to one embodiment will now be described with reference to Figures 1 to 8. The electric compressor according to the present 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.

[0024] 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.

[0025] 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. In addition, a hole 13h is formed in the end wall 13a of the motor housing 13. The hole 13h penetrates the end wall 13a of the motor housing 13 in the thickness direction. The hole 13h is located closer to the peripheral wall 13b than the boss portion 13c.

[0026] The motor housing 13 has a suction port 13d. The suction port 13d is formed in a portion of the peripheral wall 13b of the motor housing 13 near the end wall 13a. The suction port 13d communicates between the inside and the outside of the motor housing 13. A refrigerant as a fluid is drawn into the suction port 13d from the outside.

[0027] 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 a motor housing 13. Thus, the housing 11 accommodates 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 accommodated in an inverter chamber S1.

[0028] 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.

[0029] 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. Thus, the shaft support member 18 serves as a partition between the motor 20 and the compression unit 16. A motor chamber S2 is defined by the shaft support member 18 and the end wall 13a and peripheral wall 13b of the motor housing 13. Thus, the housing 11 has the motor chamber S2. The motor chamber S2 accommodates the motor 20. Refrigerant is drawn into the motor chamber S2 through the suction port 13d.

[0030] 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. In addition, 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.

[0031] The compression section 16 includes a fixed scroll 16a and a rotating scroll 16b. The fixed scroll 16a is fixed to the motor housing 13. The rotating scroll 16b is disposed opposite to the fixed scroll 16a. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant. A volume-changeable compression chamber S3 is defined between the fixed scroll 16a and the rotating scroll 16b. A discharge chamber S4 is defined between the fixed scroll 16a and the discharge housing 12. The refrigerant compressed by the change in volume of the compression chamber S3 is discharged to the discharge chamber S4. The motor 20 rotates the rotary shaft 15. The compression section 16 is driven by the rotation of the rotary shaft 15. The compression section 16 compresses the refrigerant by the rotation of the rotary shaft 15.

[0032] <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.

[0033] The stator 22 includes a stator core 23. The stator core 23 is fixed to the inner circumferential surface of the peripheral wall 13b of the motor housing 13. Therefore, the stator core 23 is fixed to the housing 11. The stator 22 is assembled to the housing 11 by fitting the stator core 23 into the inner circumferential surface of the peripheral wall 13b of the motor housing 13 by, for example, shrink fitting. The axis of the stator core 23 coincides with the axis of the rotating shaft 15. Therefore, the axial direction of the stator core 23 coincides with the axial direction of the rotating shaft 15.

[0034] 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.

[0035] 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. The number of teeth 25 is not particularly limited, but the number of teeth 25 is a multiple of three.

[0036] As shown in Fig. 3, both end faces of the yoke 24 located in the axial direction of the rotation shaft 15 are flat. Both end faces of each tooth 25 located in the axial direction of the rotation shaft 15 are flat. The axial length of the rotation shaft 15 of the yoke 24 is the same as the axial length of the rotation shaft 15 of each tooth 25. The end face located on one side of the axial direction of the rotation shaft 15 of the yoke 24 is located on the same plane as the end face located on one side of the axial direction of the rotation shaft 15 of each tooth 25. The end face located on the other side of the axial direction of the rotation shaft 15 of the yoke 24 is located on the same plane as the end face located on the other side of the axial direction of the rotation shaft 15 of each tooth 25.

[0037] The end face of the yoke 24 located on one side of the axial direction of the rotating shaft 15 and the end face of each tooth 25 located on one side of the axial direction of the rotating shaft 15 form a first core end face 23a located on one side of the axial direction of the rotating shaft 15 of the stator core 23. The end face of the yoke 24 located on the other side of the axial direction of the rotating shaft 15 and the end face of each tooth 25 located on the other side of the axial direction of the rotating shaft 15 form a second core end face 23b located on the other side of the axial direction of the rotating shaft 15 of the stator core 23. Therefore, the stator core 23 has a first core end face 23a and a second core end face 23b. The first core end face 23a is a core end face located on one side of the axial direction of the rotating shaft 15 of the stator core 23. The second core end face 23b is a core end face located on the other side of the axial direction of the rotating shaft 15 of the stator core 23.

[0038] As shown in FIG. 1, the stator core 23 is arranged within the motor housing 13 so that the first core end face 23a faces the shaft support member 18 in the axial direction of the rotating shaft 15 and the second core end face 23b faces the end wall 13a of the motor housing 13 in the axial direction of the rotating shaft 15.

[0039] 2 and 3, 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 face 23a to the second core 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 circumferential sides of the stator core 23.

[0040] 2, the 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, the stator 22 includes coils of multiple phases. The coils of multiple phases include the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W.

[0041] <Winding> The stator 22 includes a U-phase winding 29U that is a winding wound around the stator core 23 in concentrated winding to form a plurality of U-phase coils 28U. The stator 22 includes a V-phase winding 29V that is a winding wound around the stator core 23 in concentrated winding to form a plurality of V-phase coils 28V. The stator 22 includes a W-phase winding 29W that is a winding wound around the stator core 23 in concentrated winding to form a plurality of W-phase coils 28W. Thus, the stator 22 includes windings of multiple phases. The windings include a U-phase winding 29U, a V-phase winding 29V, and a W-phase winding 29W. The coils of the multiple phases are formed by winding the windings of the multiple phases around the stator core 23 in concentrated winding.

[0042] 8, U-phase winding 29U, V-phase winding 29V, and W-phase winding 29W are each formed by, for example, providing enamel coating 29b on the outer periphery of conductor 29a. Thus, the windings have conductor 29a and enamel coating 29b provided on the outer periphery of conductor 29a.

[0043] A portion of each of U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W passes through a slot 30, which is a space formed between adjacent teeth 25 in the circumferential direction of stator core 23. Note that a slot insulating sheet 31 insulates each of the portions of U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W that pass through each slot 30 from stator core 23.

[0044] 1, the stator 22 has first coil ends 32 and second coil ends 33. The first coil ends 32 are parts of the U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W, respectively, and protrude from the first core end face 23a. The second coil ends 33 are parts of the U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W, respectively, and protrude from the second core end face 23b. Thus, the first coil ends 32 and the second coil ends 33 are parts of the coils of each phase, and are coil ends that protrude from the core end faces.

[0045] <Insulator> 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.

[0046] 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 each insulator base 51 coinciding with the axis of the yoke 24. One of the two insulators 50 is disposed relative to the first core end face 23a of the stator core 23 in contact with the first core end face 23a. The other of the two insulators 50 is disposed relative to the second core end face 23b of the stator core 23 in contact with the second core end face 23b. Thus, each insulator 50 is disposed relative to the core end face of the stator core 23. The outer diameter of the insulator base 51 is smaller than the outer diameter of the yoke 24. The inner diameter of the insulator base 51 is the same as the inner diameter of the yoke 24.

[0047] Each insulator tooth portion 52 extends from an inner peripheral surface 51a of the insulator base 51 in the radial direction of the insulator base 51. The multiple insulator teeth portions 52 are arranged at intervals in the circumferential direction of the insulator base 51. The multiple insulator teeth portions 52 are arranged at equal intervals in the circumferential direction of the insulator base 51. Each insulator tooth portion 52 extends from the inner peripheral 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 portions 52. The number of insulator teeth portions 52 is the same as the number of teeth 25 of the stator core 23.

[0048] 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 an inner peripheral 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 contacts each tooth 25. The insulator flange portion 54 protrudes along the insulator base portion 51 from the end portion of the insulator extension portion 53 opposite to the insulator base portion 51.

[0049] Of the two insulators 50, the insulator 50 disposed against the first core 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.

[0050] Of the two insulators 50, the insulator 50 disposed facing the first core 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, each of the V-phase through grooves 62V, and each of the W-phase through grooves 62W penetrates the insulator 50 in the radial direction.

[0051] <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, first, U-phase winding 29U, V-phase winding 29V, and W-phase winding 29W are started to be wound around each tooth extension portion 26 and insulator extension portion 53 of each insulator 50. Then, U-phase winding 29U, V-phase winding 29V, and W-phase winding 29W are sequentially wound by concentrated winding around tooth extension portions 26 and insulator extension portions 53 of each insulator 50 that are arranged every two 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 two in the circumferential direction of stator core 23. In this embodiment, five each of U-phase coil 28U, V-phase coil 28V, and W-phase coil 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.

[0052] Of the two insulators 50, the insulator 50 arranged facing first core end face 23a of stator core 23 provides insulation between U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W and first core end face 23a. Of the two insulators 50, the insulator 50 arranged facing second core end face 23b of stator core 23 provides insulation between U-phase coil 28U, V-phase coil 28V, and W-phase coil 28W and second core end face 23b.

[0053] The U-phase winding 29U includes a U-phase crossover wire 64U that connects the U-phase coils 28U together in the circumferential direction of the stator core 23. The U-phase crossover wire 64U is drawn out from the first coil ends 32 of the U-phase coils 28U and guided into the U-phase guide groove 61U via the U-phase through groove 62U. The V-phase winding 29V includes a V-phase crossover wire 64V that connects the V-phase coils 28V together in the circumferential direction of the stator core 23. The V-phase crossover wire 64V is drawn out from the first coil ends 32 of the V-phase coils 28V and guided into the V-phase guide groove 61V via the V-phase through groove 62V. The W-phase winding 29W includes a W-phase crossover wire 64W that connects the W-phase coils 28W together in the circumferential direction of the stator core 23. W-phase crossover wire 64W is pulled out from first coil end 32 of W-phase coil 28W and guided into W-phase guide groove 61W via W-phase through groove 62W.

[0054] <Cover> As shown in FIG. 5, the electric compressor 10 includes a cover 65. The cover 65 is cylindrical. The cover 65 has insulating properties. The cover 65 is made of, for example, a resin material. The inner diameter of the cover 65 is larger than the outer diameter of the insulator base 51. The cover 65 is attached to the insulator 50 in a state in which the cover 65 surrounds the outer peripheral surface of the insulator 50 that is disposed against the first core end face 23a of the stator core 23, out of the two insulators 50.

[0055] 1, the cover 65 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 65 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.

[0056] <Cover material> As shown in FIG. 6, the stator 22 includes a cover member 70. The cover member 70 is substantially cylindrical. The cover member 70 has insulating properties. The cover member 70 is made of, for example, a resin material. The cover member 70 is disposed on the opposite side of the second coil end 33 from the second core end face 23b in the axial direction of the rotating shaft 15. The cover member 70 is attached to the insulator 50 that is disposed against the second core end face 23b of the stator core 23, out of the two insulators 50. Note that the configuration for attaching the cover member 70 to the insulator 50 is not particularly limited. For example, the cover member 70 is attached to the insulator 50 by a concave-convex fit between a convex portion protruding from the cover member 70 and a concave portion formed in the insulator 50.

[0057] As shown in Figs. 6 and 7, the cover member 70 has a cover end surface 71. The cover end surface 71 is located on the opposite side to the second coil end 33 in the axial direction of the rotating shaft 15. The cover end surface 71 is substantially annular. An insulating storage section 72 is provided in the cover end surface 71. The storage section 72 is, for example, in the shape of a rectangular tube. As shown in Fig. 7, the storage section 72 has an end wall 72a and a peripheral wall 72b. The peripheral wall 72b extends in the shape of a rectangular tube from the outer periphery of the end wall 72a.

[0058] <Leader> The stator 22 has three lead wires 73. Each lead wire 73 is a part of the U-phase winding 29U, the V-phase winding 29V, and the W-phase winding 29W. Each lead wire 73 is drawn out from the second coil end 33 of the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W, respectively. Thus, the three lead wires 73 correspond to the respective phases.

[0059] The lead wires 73 of each phase are parts of the U-phase winding 29U, the V-phase winding 29V, and the W-phase winding 29W, respectively, and therefore, like the U-phase winding 29U, the V-phase winding 29V, and the W-phase winding 29W, for example, the lead wires 73 are provided with an enamel coating 29b on the outer periphery of the conductor 29a. The lead wires 73 of each phase further have a covered portion 75 in which the outer periphery of the enamel coating 29b is covered with a tubular resin insulating member 74, and a non-covered portion 76 in which the insulating member 74 is not disposed. In addition, in Figs. 6 and 7, the insulating member 74 is indicated by dot hatching. In this way, the windings and the lead wires 73 which are parts thereof are provided with an enamel coating 29b on the outer periphery of the conductor 29a, for example, and the insulating member 74 covers the outer periphery of the lead wires 73.

[0060] 7, the ends of the lead wires 73 of each phase are uncoated portions 76 where no insulating member 74 is disposed, and are electrically connected to each other to form a neutral point connection portion 77 that constitutes a neutral point. Therefore, the stator 22 includes a neutral point connection portion 77 that constitutes a neutral point by electrically connecting the ends of the lead wires 73 of each phase. The uncoated portions 76 include the neutral point connection portion 77.

[0061] The neutral point connection portion 77 is stored in the storage portion 72. Therefore, the storage portion 72 stores the neutral point connection portion 77. The neutral point connection portion 77 is inserted into the storage portion 72 through an opening in the peripheral wall 72b of the storage portion 72. The uncoated portion 76 has an extension portion 78 that is continuous with the neutral point connection portion 77 and extends from the storage portion 72 to the outside of the storage portion 72 by a predetermined length. The extension portion 78 extends to the outside of the storage portion 72 through the opening in the peripheral wall 72b of the storage portion 72. In this way, the lead wire 73 of each phase has an uncoated portion 76 in which the insulating member 74 is not arranged, includes the neutral point connection portion 77, and has an extension portion 78 that is continuous with the neutral point connection portion 77 and extends from the storage portion 72 to the outside of the storage portion 72 by a predetermined length. The covering portion 75 is continuous with the portion of the extension portion 78 opposite to the neutral point connection portion 77 .

[0062] As shown in Fig. 8, the storage section 72 is filled with resin 79. In Fig. 8, the resin 79 is indicated by dot hatching. The inside of the storage section 72 is sealed with the resin 79. In detail, with the neutral point connection section 77 inserted into the storage section 72, the resin 79 is poured into the storage section 72 and hardened, thereby sealing the inside of the storage section 72 with the resin 79. This ensures the insulation of the neutral point connection section 77.

[0063] <Page 1 and Page 2> As shown in Figures 6 and 7, the cover end surface 71 has a first surface 81 and a second surface 82. The first surface 81 is located farther from the second coil end 33 than the second surface 82. The second surface 82 is a surface different from the first surface 81. The first surface 81 and the second surface 82 are flat surfaces extending parallel to each other. The cover end surface 71 has a connecting surface 83. The connecting surface 83 connects the first surface 81 and the second surface 82. The connecting surface 83 is tapered and extends obliquely with respect to the first surface 81 and the second surface 82.

[0064] The first surface 81 has a mounting surface 84 on which the storage section 72 is mounted, and an extending surface 85 on which the extending section 78 is disposed. The extending surface 85 is located closer to the connecting surface 83 than the mounting surface 84. The cover end surface 71 also has a circumferential surface 86 that connects an end portion of the second surface 82 opposite the connecting surface 83 to an end portion of the first surface 81 opposite the connecting surface 83. The circumferential surface 86 extends in the circumferential direction of the cover end surface 71. The circumferential surface 86 is located on the same plane as the first surface 81.

[0065] As shown in FIG. 7, a plurality of locking pieces 87 are provided on the mounting surface 84. Each locking piece 87 stands upright from the mounting surface 84. The tip of each locking piece 87 is hook-shaped. Each locking piece 87 is configured to be able to lock the storage section 72. The storage section 72 is attached to the cover end surface 71 in a state in which it is placed on the mounting surface 84 by being locked to each locking piece 87. Therefore, the storage section 72 is a separate member from the cover member 70. The extension portion 78 of the lead wire 73 of each phase passes over the extension surface 85. In this manner, the storage section 72 and the extension portion 78 are arranged on the first surface 81.

[0066] The covering portion 75 of the lead wire 73 of each phase passes over the second surface 82. Therefore, the covering portion 75 is disposed on the second surface 82. Further, a portion of the covering portion 75 of the lead wire 73 of each phase extends along the connection surface 83.

[0067] <Regulations Department> The cover member 70 has a restricting portion 90. The restricting portion 90 has an upright piece 90a that stands from the outer periphery of the second surface 82, and a restricting piece 90b that bends from the tip of the upright piece 90a and extends so as to overlap the second surface 82 in the axial direction of the rotation shaft 15. The covering portion 75 passes between the second surface 82 and the restricting piece 90b. The restricting piece 90b restricts the movement of the covering portion 75 in a direction away from the second surface 82. Therefore, the restricting portion 90 restricts the movement of the covering portion 75 in a direction away from the second surface 82.

[0068] <Insulating wall section> The cover member 70 has an insulating wall portion 91. The insulating wall portion 91 is a thin plate that stands up from a portion of the cover member 70 that extends from the outer circumferential edge of the extending surface 85 across the outer circumferential edge of the connecting surface 83 to the outer circumferential edge of the second surface 82. The insulating wall portion 91 covers the extending portion 78 from the radial outside of the rotating shaft 15.

[0069] <Through hole> A through hole 92 is formed in each of the first surface 81 and the second surface 82. Therefore, the through hole 92 is formed in at least the first surface 81. The through holes 92 penetrate the cover member 70. A first end of each through hole 92 opens to the cover end surface 71. A second end of each through hole 92 opens to the end surface of the cover member 70 located on the second coil end 33 side. Each through hole 92 allows the refrigerant drawn into the motor chamber S2 to flow toward the second coil end 33.

[0070] <Airtight terminal> 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 U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W. Therefore, the electric compressor 10 includes the conductive member 41. Note that FIG. 1 illustrates only one conductive member 41. Each conductive member 41 is a cylindrical metal terminal extending linearly. A first end of each conductive member 41 is electrically connected to the inverter 17 in the inverter chamber S1. A second end of each conductive member 41 protrudes from the inverter chamber S1 into the motor housing 13 through a hole 13h. The airtight terminal 40 also includes 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 on the outer surface of the end wall 13a of the motor housing 13 in the inverter chamber S1.

[0071] The stator 22 includes a lead wire 43. The lead wire 43 is drawn out from the motor 20. The lead wire 43 is drawn out from the second coil ends 33 of the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W. Thus, the lead wire 43 is drawn out from the coil end of each phase. Thus, three lead wires 43 are drawn out from the motor 20. Note that only one lead wire 43 is shown in FIG. 1.

[0072] The stator 22 includes a cluster block 44. The cluster block 44 accommodates three connection terminals 45 therein corresponding to the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W. The cluster block 44 has insulating properties. The cluster block 44 is made of, for example, a resin material. Each connection terminal 45 electrically connects each conductive member 41 to each lead wire 43.

[0073] 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.

[0074] 6, the cluster block 44 is disposed at a position relative to the cover member 70 where it overlaps with the peripheral surface 86 of the cover end face 71 in the axial direction of the rotating shaft 15. Therefore, the cluster block 44 is disposed at a position relative to the cover member 70 where it does not overlap with the storage portion 72 in the axial direction of the rotating shaft 15.

[0075] [Operation of the embodiment] Next, the operation of this embodiment will be described. The refrigerant drawn into the motor chamber S2 flows toward the second coil end 33 through the through holes 92. Therefore, the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W are efficiently cooled by the refrigerant. In addition, in the cover end surface 71, the first surface 81 is disposed at a position farther from the second coil end 33 than the second surface 82. Therefore, the insulation distance between the extension portion 78 disposed on the first surface 81 and the second coil end 33 through the through holes 92 is longer. Therefore, insulation failure between the extension portion 78 and the second coil end 33 through the through holes 92 is suppressed. Furthermore, the covering portion 75 disposed on the second surface 82 is a portion of the lead wire 73 of each phase that is covered by the insulating member 74. Therefore, even if the second surface 82 is disposed closer to the second coil end 33 than the first surface 81, insulation failure between the covering portion 75 and the second coil end 33 through the through holes 92 does not occur. Therefore, insulation between the lead wires 73 of each phase and the second coil ends 33 is ensured.

[0076] [Effects of the embodiment] The above embodiment can provide the following effects. (1) The refrigerant drawn into the motor chamber S2 flows toward the second coil end 33 through the through holes 92, so that the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W can be efficiently cooled by the refrigerant. In addition, in the cover end surface 71, the first surface 81 is disposed at a position farther away from the second coil end 33 than the second surface 82. Therefore, the insulation distance between the extension portion 78 disposed on the first surface 81 and the second coil end 33 through the through hole 92 can be increased. Therefore, insulation failure between the extension portion 78 and the second coil end 33 through the through hole 92 can be suppressed. In addition, by effectively utilizing the space generated by the second surface 82 being closer to the second coil end 33 than the first surface 81, the electric compressor 10 can be reduced in size in the axial direction of the rotating shaft 15. As a result, it is possible to reduce the size of the electric compressor 10 in the axial direction of the rotating shaft 15, while ensuring insulation between the lead-out wires 73 of each phase and the second coil ends 33, and cooling the U-phase coil 28U, the V-phase coil 28V, and the W-phase coil 28W.

[0077] (2) The cluster block 44 is disposed at a position relative to the cover member 70 that does not overlap with the storage portion 72 in the axial direction of the rotating shaft 15. This allows the cluster block 44 to be disposed as close as possible to the second coil end 33, compared to a case in which the cluster block 44 is disposed at a position relative to the cover member 70 that overlaps with the storage portion 72 in the axial direction of the rotating shaft 15. This allows the electric compressor 10 to be further reduced in size in the axial direction of the rotating shaft 15.

[0078] (3) The cover member 70 has the insulating wall portion 91 that covers the extending portion 78 of the lead wire 73 of each phase from the radial outside of the rotating shaft 15. With this, the insulating wall portion 91 can ensure insulation between the extending portion 78 and the housing 11, for example. Therefore, since the cover member 70 has the insulating wall portion 91, the insulation of the lead wire 73 of each phase can be further ensured.

[0079] (4) The connection surface 83 is tapered and extends obliquely relative to the first surface 81 and the second surface 82. Therefore, the lead wires 73 of each phase can be extended without excessive bending of the portions of the lead wires 73 of each phase that extend between the first surface 81 and the second surface 82. Therefore, the load applied to the lead wires 73 of each phase can be suppressed, and the durability of the lead wires 73 of each phase can be improved.

[0080] (5) The cover member 70 has the restricting portions 90 that restrict movement of the covered portions 75 of the lead wires 73 of each phase in a direction away from the second surface 82. As a result, the covered portions 75 of each phase that are arranged on the second surface 82 can be brought as close as possible to the second surface 82 by the restricting portions 90. Therefore, the covered portions 75 of each phase that are arranged on the second surface 82 can be arranged as close as possible to the second coil ends 33. This allows the electric compressor 10 to be further reduced in size in the axial direction of the rotating shaft 15.

[0081] (6) The storage section 72 is attached to the cover end surface 71 while being placed on the mounting surface 84 by being engaged with each of the locking pieces 87. Therefore, for example, a process of fastening the neutral point connection section 77 to the second coil end 33 with a fixing thread is not required, and the work process can be simplified.

[0082] (7) Since the storage section 72 is provided on the cover end face 71, the electric compressor 10 can be made smaller in size in the radial direction of the rotating shaft 15 than if the storage section 72 was provided, for example, on the outer periphery of the insulator 50.

[0083] (8) For example, if the portion of the lead wire 73 of each phase located within the storage section 72 is covered with the insulating member 74, the resin 79 poured into the storage section 72 may not easily adhere to the insulating member 74, which may make it difficult to seal the inside of the storage section 72 with the resin 79. Therefore, the lead wire 73 of each phase is not provided with the insulating member 74 even in a portion extending from the storage section 72 to the outside of the storage section 72 by a predetermined length. In this manner, the lead wire 73 of each phase has an uncovered portion 76 without the insulating member 74, including the neutral point connection portion 77, and having an extension portion 78 that is continuous with the neutral point connection portion 77 and extends from the storage section 72 to the outside of the storage section 72 by a predetermined length. With this, even if there is an error in the design dimensions of the storage section 72, the portion of the lead wire 73 of each phase located within the storage section 72 can be reliably inserted as the uncovered portion 76 without the insulating member 74. Therefore, the inside of the storage portion 72 can be reliably sealed with the resin 79 .

[0084] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0085] In the above embodiment, the position of the cluster block 44 relative to the cover member 70 is not particularly limited. In the above embodiment, the cover member 70 does not need to have the insulating wall portion 91 .

[0086] In the embodiment, the connection surface 83 connecting the first surface 81 and the second surface 82 does not have to be tapered. The connection surface 83 may be, for example, a stepped surface extending in a direction perpendicular to the first surface 81 and the second surface 82.

[0087] In the above embodiment, the cover member 70 does not need to include the restriction portion 90 . In the embodiment, the storage portion 72 may be formed integrally with the cover member 70 .

[0088] In the embodiment, the circumferential surface 86 of the cover end surface 71 does not have to be located on the same plane as the first surface 81. For example, the circumferential surface 86 may be located on the same plane as the second surface .

[0089] In the embodiment, a part of the covering portion 75 may be disposed on the extending surface 85 . In the above embodiment, the second surface 82 does not necessarily have to have the through-holes 92 formed therein.

[0090] In the above embodiment, the cover member 70 may be attached to the stator core 23 instead of the insulator 50 . In the embodiment, the cover member 70 does not have to be substantially cylindrical. For example, the cover member 70 may have a shape in which the portion of the cover member 70 that forms the circumferential surface 86 is removed.

[0091] In the above-mentioned embodiment, the compression section 16 is not limited to a scroll type, and 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 conditioner, but the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and may compress air, which serves as a fluid to be supplied to the fuel cell, by the compression unit 16.

[0092] [Note] The above embodiment includes the configurations described in the following supplementary notes. <Appendix 1> A rotation axis; a compression unit that compresses a fluid by rotation of the rotary shaft; A motor that rotates the rotary shaft; a housing having a motor chamber that houses the motor and into which fluid is drawn, The motor includes a stator. The stator includes: A stator core fixed to the housing; a plurality of phase coils formed by winding a plurality of phase windings around the stator core in a concentrated winding manner; an insulator that is disposed against a core end surface of the stator core that is located in the axial direction of the rotation shaft and that provides insulation between the coil and the core end surface; a coil end that is a part of the coil of each phase and protrudes from the core end surface; a lead wire which is a part of the winding of each phase and is led out from a coil end of each phase; a neutral point connection portion that constitutes a neutral point by electrically connecting ends of the lead wires of each phase; an insulating cover member disposed on the opposite side of the coil end from the core end surface in the axial direction, The winding includes a conductor and a coating applied to an outer circumferential side of the conductor, the cover member has a cover end surface located on an opposite side to the coil end in the axial direction, An insulating storage portion for storing the neutral point connection portion is provided on the end surface of the cover, The lead wires of each phase are: a coating portion in which an outer circumferential side of the coating is coated with an insulating member; a non-covered portion in which the insulating member is not disposed, which includes the neutral point connection portion, and which has an extension portion that is continuous with the neutral point connection portion and extends from the storage portion to the outside of the storage portion by a predetermined length; The cover end surface is a first surface on which the storage portion and the extension portion are disposed; a second surface that is different from the first surface; At least the first surface is provided with a through hole through which fluid drawn into the motor chamber flows toward the coil end, 13. An electric compressor, comprising: a rotor having a first surface and a second surface;

[0093] <Appendix 2> an inverter that drives the motor; a conductive member electrically connected to the inverter, The stator includes: A lead wire is drawn out from the coil end of each phase; an insulating cluster block that accommodates a connection terminal therein for electrically connecting the conductive member and the lead wire; The electric compressor described in <Appendix 1>, wherein the cluster block is disposed at a position relative to the cover member so as not to overlap with the storage portion in the axial direction.

[0094] <Appendix 3> The electric compressor according to <Appendix 1> or <Appendix 2>, wherein the cover member has an insulating wall portion that covers the extension portion from the radial outside of the rotating shaft.

[0095] <Appendix 4> The first surface and the second surface are flat surfaces extending parallel to each other, the cover end surface has a connection surface that connects the first surface and the second surface, The electric compressor according to any one of <Appendix 1> to <Appendix 3>, wherein the connection surface is tapered and extends obliquely with respect to the first surface and the second surface.

[0096] <Appendix 5> The electric compressor described in any one of <Appendix 1> to <Appendix 4>, wherein the cover member has a restricting portion that restricts movement of the covering portion in a direction away from the second surface. [Explanation of symbols]

[0097] 10...electric compressor, 11...housing, 15...rotating shaft, 16...compression section, 17...inverter, 20...motor, 22...stator, 23...stator core, 23a...first core end face which is a core end face, 23b...second core end face which is a core end face, 28U...U-phase coil which is a coil, 28V...V-phase coil which is a coil, 28W...W-phase coil which is a coil, 29a...conductor, 29b...enamel coating which is a coating, 29U...U-phase winding which is a winding, 29V...V-phase winding which is a winding, 29W...W-phase winding which is a winding , 32...first coil end which is a coil end, 33...second coil end which is a coil end, 41...conductive member, 43...lead wire, 44...cluster block, 45...connection terminal, 50...insulator, 70...cover member, 71...cover end surface, 72...storage section, 73...drawing wire, 74...insulating member, 75...coated section, 76...uncoated section, 77...neutral point connection section, 78...extension section, 81...first surface, 82...second surface, 83...connection surface, 90...regulating section, 91...insulating wall section, 92...through hole, S2...motor chamber.

Claims

1. A rotation axis; a compression unit that compresses a fluid by rotation of the rotary shaft; A motor that rotates the rotary shaft; a housing having a motor chamber that houses the motor and into which fluid is drawn, The motor includes a stator. The stator includes: A stator core fixed to the housing; a plurality of phase coils formed by winding a plurality of phase windings around the stator core in a concentrated winding manner; an insulator that is disposed against a core end surface of the stator core that is located in the axial direction of the rotation shaft and that provides insulation between the coil and the core end surface; a coil end that is a part of the coil of each phase and protrudes from the core end surface; a lead wire which is a part of the winding of each phase and is led out from a coil end of each phase; a neutral point connection portion that constitutes a neutral point by electrically connecting ends of the lead wires of each phase; an insulating cover member disposed on the opposite side of the coil end from the core end surface in the axial direction, The winding includes a conductor and a coating applied to an outer circumferential side of the conductor, the cover member has a cover end surface located on an opposite side to the coil end in the axial direction, An insulating storage portion for storing the neutral point connection portion is provided on the end surface of the cover, The lead wires of each phase are: a coating portion in which an outer circumferential side of the coating is coated with an insulating member; a non-covered portion in which the insulating member is not disposed, which includes the neutral point connection portion, and which has an extension portion that is continuous with the neutral point connection portion and extends from the storage portion to the outside of the storage portion by a predetermined length; The cover end surface is a first surface on which the storage portion and the extension portion are disposed; a second surface that is different from the first surface; At least the first surface is provided with a through hole through which fluid drawn into the motor chamber flows toward the coil end, The electric compressor, wherein the first surface is disposed at a position farther from the coil end than the second surface.

2. an inverter that drives the motor; a conductive member electrically connected to the inverter, The stator includes: A lead wire is drawn out from the coil end of each phase; an insulating cluster block that accommodates a connection terminal therein for electrically connecting the conductive member and the lead wire; The electric compressor according to claim 1 , wherein the cluster block is disposed at a position relative to the cover member so as not to overlap with the storage portion in the axial direction.

3. 3. The electric compressor according to claim 1, wherein the cover member has an insulating wall portion that covers the extension portion from a radially outer side of the rotary shaft.

4. The first surface and the second surface are flat surfaces extending parallel to each other, the cover end surface has a connection surface that connects the first surface and the second surface, 2. The electric compressor according to claim 1, wherein the connection surface is tapered and extends obliquely with respect to the first surface and the second surface.

5. The electric compressor according to claim 1 , wherein the cover member has a restricting portion that restricts movement of the covering portion in a direction away from the second surface.

Images