Stator unit, electric motor provided with said stator unit, and air conditioner, refrigerator and vehicle-mounted

Abstract

The invention provides a stator unit, a motor provided with the stator unit, and an air conditioning device, a refrigerator and a vehicle-mounted device equipped with the motor. The stator unit can ensure the cooling efficiency of a coil. At least one refrigerant passage between the plurality of coils (U1 to W3) is closed by a harness block (70). However, since at least a part of a pipe (59) covering the neutral point (58) is disposed between the bottom surface of the harness block (70) and the coils (V1, W2), the refrigerant passage can be prevented from being further closed by the pipe (59). As a result, the cooling medium can easily pass through the plurality of refrigerant channels, and therefore, the cooling efficiency of the coils (U1 to W3) can be ensured.

Description

Technical Field

[0001] The present invention relates to a stator unit capable of ensuring cooling efficiency of coils, an electric motor having the stator unit, and an air conditioning unit, refrigerator, and vehicle-mounted device equipped with the electric motor. Background Technology

[0002] Electric compressors used in air conditioning units, refrigerators, vehicle-mounted devices, etc., mainly include: a compression section for compressing fluid, a three-phase AC motor for driving the compression section, and a control circuit for driving the motor (Patent Documents 1 and 2). The stator of the three-phase AC motor includes: a cylindrical stator core, an insulated cylindrical coil frame disposed on the axial end face of the stator core, and multiple three-phase coils wound in a concentrated manner around the stator core and coil frame and arranged circumferentially thereon. Multiple terminal-side leads are led out from each coil, and multiple connection terminals are respectively provided at the ends of these terminal-side leads to connect to the control circuit. These connection terminals are housed in an insulated wire harness block. In addition, multiple refrigerant channels communicating with both sides of the stator are provided between the multiple coils arranged circumferentially, and the coils are cooled by a cooling medium passing through these refrigerant channels.

[0003] In Patent Document 1, in order to accommodate the electric motor within a limited space within the housing of the electric compressor, the wiring harness block is made to contact the axial end face of the coil holder on the side opposite to the stator core. Furthermore, when viewed from the axial direction, the wiring harness block is configured to cover a portion between multiple coils, thus partially sealing off the refrigerant passage between the coils.

[0004] In Patent Document 2, a neutral point is formed by interconnecting multiple neutral point-side leads extending from the coils, and this neutral point is covered by a closed-end, bag-shaped insulating tube. The tube is fixed to the stator by inserting it between the coils, but this partially seals off the refrigerant passages between the coils. It should be noted that in Patent Document 2, the gap within the electric compressor housing is wider, thus the wiring harness block is axially separated from the coil frame, and the refrigerant passages are not sealed by the wiring harness block.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2023 / 189893

[0008] Patent Document 2: Japanese Patent Application Publication No. 2018-157711 Summary of the Invention

[0009] The technical problem that the invention aims to solve

[0010] In Patent Document 2, a wire harness block is provided at a position where it is separated from the tubes along the circumferential direction. In Patent Document 2, when the wire harness block is in contact with the coil frame as in Patent Document 1, the refrigerant passages at different positions along the circumference are closed by the wire harness block and each tube. Therefore, the problem of reduced cooling efficiency of the coil arises.

[0011] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a stator unit that can ensure the cooling efficiency of the coil, an electric motor having the stator unit, and an air conditioning unit, a refrigerator and an in-vehicle device equipped with the electric motor.

[0012] Solutions for solving technical problems

[0013] To achieve this objective, the stator unit of the present invention comprises a cylindrical stator disposed in an electric motor, and an insulating wire harness block in contact with the axial end face of the stator. The stator comprises: a stator core with a plurality of teeth protruding radially inward from a yoke; an insulating coil frame disposed on the axial end face of the stator core; three-phase coils, each formed by wires wound in a concentrated manner around each of the teeth and the coil frame, and arranged in a plurality of such coils in the circumferential direction of the stator; a plurality of refrigerant channels formed between the coils in the circumferential direction and communicating with both sides of the stator in the axial direction; and a plurality of terminal-side leads continuous to one end of the wires forming the coils and leading from each of the coils. The wire harness block comprises: multiple neutral point side leads, continuous with the other end of the conductors forming the coils and leading out from each of the coils, forming a neutral point by interconnecting the multiple neutral point side leads; and an insulating tube covering the neutral point and in the form of a closed-end tube, the wire harness block being an insulating housing for housing three-phase connection terminals disposed at the ends of the multiple terminal side leads, the bottom surface of the wire harness block contacting the axial end face of the coil frame opposite to the stator core to cover at least one of the refrigerant channels when viewed from the axial direction, at least a portion of the tube being arranged overlappingly between the bottom surface of the wire harness block and the coils when viewed from the axial direction.

[0014] Invention Effects

[0015] According to the stator unit of the first embodiment, the bottom surface of the wire harness block contacts the axial end face of the coil frame opposite to the stator core. Therefore, if the wire harness block covers at least one refrigerant passage between multiple coils when viewed axially, that refrigerant passage is closed by the wire harness block. However, since at least a portion of the tube covering the neutral point is arranged overlapping between the bottom surface of the wire harness block and the coil when viewed axially, further closure of the refrigerant passage by the tube can be prevented. As a result, the cooling medium can easily pass through multiple refrigerant passages, thus ensuring the cooling efficiency of the coils.

[0016] According to the second stator unit, in addition to the effects achieved by the first stator unit, the following effects are also achieved: The direction in which the terminal-side leads in the circumferential direction of the coil frame extend from the wire harness block is designated as the first direction, and the side opposite to the first direction is designated as the second direction. Near the wire harness block on the second direction side, the terminal-side leads are not densely packed compared to the vicinity of the first direction side, thus easily expanding the refrigerant passage. The end of the closed tube faces the second direction and is located closer to the first direction side than the end of the wire harness block in the second direction. That is, the tube does not protrude near the second direction side relative to the wire harness block. As a result, the refrigerant passage, which is easily expanded due to the sparse terminal-side leads, can be prevented from being closed by the tube, thus improving the coil cooling efficiency.

[0017] According to the third stator unit, in addition to the effects achieved by the first stator unit, the following effects are also achieved: The coil frame has an outer peripheral wall portion and an inner peripheral wall portion protruding relative to the coil towards the side opposite to the stator core. The outer peripheral wall portion is provided along the radial outer side of the coil frame, and the inner peripheral wall portion is provided along the radial inner side of the coil frame. Multiple terminal-side leads, multiple neutral-point-side leads, and a tube are fixed to either the outer peripheral wall portion or the inner peripheral wall portion by winding a rope. As a result, on the side opposite to the side where these are fixed, i.e., the other side of the outer peripheral wall portion and the inner peripheral wall portion, the refrigerant passage is less likely to be closed by the terminal-side leads, the neutral-point-side leads, and the tube. That is, the refrigerant passage can be easily enlarged on the other side of the outer peripheral wall portion and the inner peripheral wall portion, thereby improving the cooling efficiency of the coil.

[0018] According to the fourth stator unit, in addition to the effects achieved by the third stator unit, the following effects are also achieved: The direction in which the end of the circumferential tube of the coil frame faces is designated as the second direction. Multiple neutral point side leads extend from each coil in the second direction and merge sequentially. When viewed axially, the end side of the tube, the wire harness block, and the coil that overlaps with only one neutral point side lead overlap. In this portion that overlaps with only one lead, compared to other portions, the space between the bottom surface of the wire harness block and the coil can be expanded to accommodate the space other than the neutral point side lead. Thus, the size of the space available for arranging the tube within this space is minimized, thereby enabling the miniaturization of the stator unit.

[0019] According to the stator unit of the fifth embodiment, in addition to the effects achieved by the stator unit of the first embodiment, the following effects are also achieved: The wire harness block includes: a base plate having a bottom surface, a first through hole penetrating the base plate axially, and a wall portion having a limiting surface facing the first through hole and extending from the bottom surface toward the stator core. By inserting a protrusion protruding from the axial end face of the coil frame into the first through hole, movement of the wire harness block relative to the coil frame in a direction other than axial is substantially restricted. Furthermore, with the abutting surface abutting against the limiting surface, a protrusion extending from the end of the protrusion in the same direction as the limiting surface is axially opposed to a portion of the base plate surrounding the first through hole. Therefore, the protrusion hooks onto the base plate, also restricting axial movement of the wire harness block relative to the coil frame. Even if it is desired to move the base plate relative to the direction in which the protrusion extends to release their opposition, this relative movement can be restricted by the abutting surface of the coil frame against the limiting surface of the wall portion, thereby suppressing the release of the opposition. As a result, the wire harness block is less likely to detach from the coil frame.

[0020] On the other hand, when assembling the wire harness block to the coil frame, firstly, with the base plate tilted so that the wall side of the base plate is away from the coil frame, the protrusion and the projection are inserted into the first through hole. Then, by tilting the wall side of the base plate using the first through hole as a fulcrum, the bottom surface of the base plate contacts the axial end face of the coil frame, and the limiting surface faces the abutting surface, thereby facilitating the assembly of the wire harness block. The above results in a balance between easy assembly of the wire harness block to the coil frame and difficulty in detachment after assembly. Furthermore, this difficulty in detachment prevents the wire harness block from floating off the coil frame due to the elastic reaction force of the tube disposed between the bottom surface of the wire harness block and the coil. Therefore, it is possible to prevent the axial dimension of the stator unit from increasing due to this floating.

[0021] The electric motor of the sixth scheme, the air conditioning unit of the seventh scheme, the refrigerator of the eighth scheme, and the vehicle-mounted device of the ninth scheme each include a stator unit of any one of the first to fifth schemes, and achieve the effect achieved by the stator unit. Attached Figure Description

[0022] Figure 1A This is a block diagram schematically showing a vehicle equipped with the electric motor of the first embodiment.

[0023] Figure 1B This is a schematic cross-sectional view of an electric compressor.

[0024] Figure 2 yes Figure 1B A half-sectional view of the stator unit at line II-II.

[0025] Figure 3 This is a schematic top view of a stator unit showing the terminal side leads.

[0026] Figure 4 This is a schematic top view of a stator unit showing the neutral point side lead.

[0027] Figure 5A yes Figure 4 A cross-sectional view of the tube at the Va-Va line and the neutral point side lead.

[0028] Figure 5B From Figure 5A The side view of the tube and the neutral point side lead observed in the direction of arrow Vb.

[0029] Figure 6A This is a schematic top view of a stator unit showing the wires used to secure the terminal side leads and the neutral point side leads.

[0030] Figure 6B yes Figure 6A A cross-sectional view of the stator unit at line VIb-VIb.

[0031] Figure 7A yes Figure 2 A cross-sectional view of the stator unit at line VIIa-VIIa.

[0032] Figure 7B yes Figure 2 A cross-sectional view of the stator unit at line VIIb-VIIb.

[0033] Figure 8A This is a top view of a stator unit having the wire harness block in the second embodiment.

[0034] Figure 8B It is a 3D diagram of the wire harness block.

[0035] Figure 9A This is a schematic block diagram showing an air conditioning unit equipped with an electric motor.

[0036] Figure 9B This is a schematic block diagram showing a refrigerator equipped with an electric motor. Detailed Implementation

[0037] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. Figure 1A This is a schematic block diagram of a vehicle 1 equipped with an air conditioning unit 10, which includes an electric compressor 11 comprising an electric motor 30 as described in the first embodiment. Figure 1B This is a schematic cross-sectional view of the electric compressor 11. Figure 1B In order to simplify the accompanying drawings, the shaded lines of a part of the electric compressor 11 (rotor 31, stator 40, etc.) have been omitted.

[0038] like Figure 1A and Figure 1BAs shown, the air conditioning unit 10 (vehicle-mounted unit) of vehicle 1 is a device for supplying cold air generated by the electric compressor 11 to the interior space of vehicle 1. The electric compressor 11 mainly includes a compressor unit 20, an electric motor 30, and an accumulator 12. The compressor unit 20 and the electric motor 30 are disposed in a sealed container 13. An intake pipe 15 and an exhaust pipe 16 connecting the inside and outside of the sealed container 13 are provided in the sealed container 13.

[0039] The accumulator 12 is used to separate the cooling medium (e.g., cooling gas) and lubricating oil, which are fluids. The cooling medium separated by the accumulator 12 is returned to the compression section 20 via the suction pipe 15. In addition, the lubricating oil separated by the accumulator 12 is returned to the lubricating oil tank in the sealed container 13. It should be noted that the air conditioning unit 10 may also have a liquid storage tank for pre-storing the compressed cooling medium, either together with or in place of the accumulator 12.

[0040] The compression unit 20 includes a rotating shaft 21, a rotating vortex 22 driven by an electric motor 30 via the rotating shaft 21, and a fixed vortex 23 fixed to the sealed container 13. The rotating shaft 21 is a rod-shaped component that rotates around an axis C, which is the axis of the rotating shaft 21. The compression unit 20 rotates by causing the rotating vortex 22 to rotate around the axis C, and compresses the cooling medium drawn in from the suction pipe 15 between the vortex-shaped blades provided on the rotating vortex 22 and the vortex-shaped blades provided on the fixed vortex 23 in a manner that meshes with the blades. Hereinafter, the axial direction of the axis C will be referred to as the "axis C direction", the direction orthogonal to the axis C will be referred to as the "radial direction", and the direction around the axis C will be referred to as the "circumferential direction".

[0041] The cooling medium compressed by the compression unit 20 is discharged from the discharge pipe 16. In the electric compressor 11 of this embodiment, the medium in which the cooling medium and lubricating oil are mixed is discharged from the discharge pipe 16. It should be noted that the compression unit 20 is not limited to the scroll type described above, but may also be reciprocating, rotary, spiral, etc.

[0042] The electric motor 30 is a three-phase AC motor. The electric motor 30 includes: a cylindrical stator 40 fixed to a sealed container 13, a cylindrical rotor 31 disposed on the inner circumference of the stator 40, and a wiring harness block 70 formed by a housing. The rotor 31 encloses the shaft C, and the stator 40 encloses the rotor 31. Furthermore, the stator 40 and the wiring harness block 70 form a stator unit 18.

[0043] The rotor 31 comprises a cylindrical rotor core 32 and multiple permanent magnets 33. The rotor core 32 is formed by stacking multiple thin electromagnetic steel sheets along the axis C. The multiple permanent magnets 33 are embedded within the rotor core 32. A rotating shaft 21 is inserted into the inner circumference of the rotor core 32 and is fixed to the rotor core 32 by pressing, heat fitting, or other means. The multiple permanent magnets 33 are arranged symmetrically around the axis C. It should be noted that the permanent magnets 33 can be embedded either exposed on the outer circumference of the rotor core 32 or not exposed.

[0044] Figure 2 yes Figure 1B A half-sectional view of stator unit 18 at line II-II. Specifically, Figure 2 The right half of the stator unit 18 is shown in a sectional view, and the left half is shown in a top view.

[0045] like Figure 1B and Figure 2 As shown, the stator 40 of the stator unit 18 mainly comprises: a cylindrical stator core 41 fixed to the inner circumferential surface of the sealed container 13; a cylindrical coil frame 42 respectively disposed on the axial end faces 41a on both sides of the stator core 41; and a coil 43 wound around the coil frame 42 and the stator core 41.

[0046] The stator core 41 is formed by stacking multiple thin sheet-like electromagnetic steel plates along the axis C. Alternatively, the stator core 41 can be formed into a cylindrical shape using continuous annular electromagnetic steel plates in the circumferential direction, or it can be formed into a cylindrical shape by connecting multiple electromagnetic steel plates that are segmented in the circumferential and radial directions. The stator core 41 has a cylindrical yoke 41b and multiple teeth 41c. The yoke 41b forms the outer peripheral portion of the stator core 41, and the multiple teeth 41c protrude from the inner peripheral surface of the yoke 41b toward the axis C. The inner peripheral end 41d of the teeth 41c on the rotor 31 side extends outwards to both sides in the circumferential direction.

[0047] The multiple teeth 41c are identical in shape and are arranged at equal intervals in the circumferential direction. Multiple grooves are formed by the gaps between adjacent teeth 41c in the circumferential direction. In this embodiment, the number of teeth 41c and grooves is nine, but it can also be appropriately changed to a multiple of three (and more than six).

[0048] A coil 43 wound in a concentrated manner is inserted into the slot. In addition, in order to prevent the coil 43 from directly contacting the inner circumferential surface of the yoke 41b, the two circumferential surfaces of the tooth 41c, and the outer circumferential surface of the inner circumferential end 41d, and to prevent the coils 43 wound on adjacent teeth 41c from contacting each other, a plurality of insulating buffer plates 44 are provided between them.

[0049] The coil frame 42 is an insulating component used to prevent the coil 43 from directly contacting the axial end face 41a of the stator core 41. The coil frame 42 can be integrally formed in the circumferential direction like the stator core 41, or it can be formed by connecting multiple components that are divided in the circumferential and radial directions. The coil frame 42 includes: a cylindrical outer peripheral wall portion 42a that stands upright from the axial end face 41a of the yoke portion 41b toward the axis C; multiple wall connecting portions 42b that extend radially inward from the lower part of the outer peripheral wall portion 42a along the tooth portion 41c; and multiple inner peripheral wall portions 42c that stand upright from the radially inward end of the wall connecting portions 42b toward the axis C.

[0050] Multiple wall connectors 42b have the same shape and are arranged at equal intervals in the circumferential direction. Multiple inner peripheral wall portions 42c also have the same shape and are arranged at equal intervals in the circumferential direction. The number of wall connectors 42b and inner peripheral wall portions 42c is the same as the number of teeth 41c. The wall connectors 42b are disposed on the axial end face 41a of the teeth 41c and the inner peripheral end 41d, and are formed such that their circumferential width is approximately the same as that of the teeth 41c excluding the inner peripheral end 41d. The inner peripheral wall portions 42c are located above the inner peripheral end 41d, and are formed such that their circumferential width is approximately the same as that of the inner peripheral end 41d.

[0051] Compared to the axial end face 42d of the outer peripheral wall portion 42a on the side opposite to the stator core 41, the axial end face 42e of the inner peripheral wall portion 42c on the side opposite to the stator core 41 is located at a lower position toward the stator core 41.

[0052] In one of the coil frames 42 on both sides of the axis C, the wire harness block 70 is configured to abut against the axial end face 42d. Hereinafter, the side in the axis C direction where the wire harness block 70 is configured will be described as the upper side of the motor 30 (stator unit 18), and the side where the wire harness block 70 is not configured will be described as the lower side of the motor 30 (stator unit 18).

[0053] A partition wall 57a, dividing the interior of the sealed container 13 along the C-axis, is provided above the wire harness block 70. A motor 30 is disposed in a space below the partition wall 57a. A control circuit 56 for driving and controlling the motor 30 is disposed in a space 57 above the partition wall 57a. It should be noted that the space 57 can also be located outside the sealed container 13, with a portion of the outer wall of the sealed container 13 serving as the partition wall 57a.

[0054] Three mating terminals 56a, 56b, and 56c, corresponding to phases U, V, and W respectively, protrude downwards from the control circuit 56. The mating terminals 56a to 56c are cylindrical metal terminals electrically connected to the control circuit 56. The mating terminals 56a to 56c penetrate the partition wall 57a and protrude towards the interior of the space where the motor 30 is located.

[0055] The coil 43 is formed by wires wound in a concentrated manner around each of nine (multiples of three) teeth 41c and the coil frame 42, and is arranged in nine (multiples of three) circumferentially. The nine coils 43 are respectively housed in the portion surrounded by the outer peripheral wall 42a, the wall connecting portion 42b, and the inner peripheral wall 42c of the coil frame 42. That is, the outer peripheral wall 42a is disposed along the radially outer side of the coil 43 and protrudes upward relative to the coil 43 (on the side opposite to the stator core 41). Furthermore, the inner peripheral wall 42c is disposed along the radially inner side of the coil 43 and protrudes upward relative to the coil 43.

[0056] Nine (multiples of three) refrigerant channels are formed by the circumferential gaps between the coils 43, each communicating with both sides of the stator 40 along the C-axis. The coils 43 are cooled by a cooling medium passing through these multiple refrigerant channels.

[0057] The nine coils 43 are three-phase coils including phases U, V, and W. The nine coils 43 consist of phase U coils U1, U2, and U3, phase V coils V1, V2, and V3, and phase W coils W1, W2, and W3. These are arranged in the order of phase U, phase V, and phase W. Figure 2 They are arranged in a clockwise direction. Specifically, they are arranged in the order of coils U1, V1, W2, U2, V2, W3, U3, V3, W1. Figure 2 Arranged in a clockwise direction. It should be noted that... Figure 2 In the middle, coil W2 is hidden on the underside (inside the paper) of wire harness block 70. Additionally, Figure 2 The clockwise direction is designated as the second direction D2, and the opposite side, i.e., the counterclockwise direction, is designated as the first direction D1.

[0058] Figure 3 This is a top view schematically showing the stator unit 18 with terminal side leads 51a to 53c. Figure 3 The diagram of wire harness block 70 is omitted. Additionally, in... Figure 3 In the diagram, terminal side leads 51a to 51c are shown with double-dotted lines, terminal side leads 52a to 52c are shown with dashed lines, and terminal side leads 53a to 53c are shown with single-dotted lines.

[0059] Terminal-side leads 51a to 53c are wirings that are continuous with one end of the conductors forming coils U1 to W3 and extend from each coil U1 to W3. Each terminal-side lead 51a to 53c is essentially a separate sheath 54 made of an insulating elastomer (see reference). Figure 7A It is formed by covering the conductor. Additionally, the terminal-side leads 51a to 53c are positioned above the coils U1 to W3 and between the outer peripheral wall portion 42a and the inner peripheral wall portion 42c (see reference). Figure 7A ).

[0060] Terminal-side leads 51a, 51b, and 51c are respectively drawn from coil U1, coil U2, and coil U3. These terminal-side leads 51a to 51c extend from coils U1 to U3 in the second direction D2 and are merged sequentially in the order of terminal-side leads 51a, 51b, and 51c. The merged terminal-side leads 51a to 51c are inserted into a tubular cover made of an insulating elastomer near coil W1 (above coil W1), and the wires exposed from the individual cover 54 inside the cover are electrically connected to each other. This three electrically connected portions constitute terminal-side lead 51.

[0061] Terminal-side leads 52a, 52b, and 52c are respectively drawn from coil V1, coil V2, and coil V3. These terminal-side leads 52a to 52c extend from coils V1 to V3 in the second direction D2 and are sequentially merged in the order of terminal-side leads 52a, 52b, and 52c. The merged terminal-side leads 52a to 52c are inserted into a cylindrical cover made of an insulating elastomer near coil W1, and the wires exposed from the individual cover 54 inside the cover are electrically connected to each other. This three electrically connected portions constitute terminal-side leads 52.

[0062] Terminal-side leads 53a, 53b, and 53c are respectively drawn from coil W1, coil W2, and coil W3. These terminal-side leads 53a to 53c extend from coils W1 to W3 in the second direction D2 and are sequentially merged in the order of terminal-side leads 53a, 53b, and 53c. The merged terminal-side leads 53a to 53c are inserted into a cylindrical cover made of an insulating elastomer near coil W1, and the wires exposed from the individual cover 54 inside the cover are electrically connected to each other. This three electrically connected portions constitute the terminal-side lead 53.

[0063] like Figure 2As shown, the ends of the terminal-side leads 51 to 53 (the side away from coils U1 to W3) enter the interior of the wire harness block 70, which serves as an insulating housing. Inside the wire harness block 70 are housed the U-phase connection terminal 61, which is electrically connected to the terminal-side lead 51; the V-phase connection terminal 62, which is electrically connected to the terminal-side lead 52; and the W-phase connection terminal 63, which is electrically connected to the terminal-side lead 53.

[0064] These three-phase connection terminals 61, 62, and 63 are arranged sequentially from the outer radial side to the inner radial side within the harness block 70. In addition, the terminal side leads 51, 52, and 53 extending from the harness block 70 toward the first direction D1 are also arranged sequentially from the outer radial side to the inner radial side.

[0065] On the top plate forming the upper surface of the wire harness block 70, through holes 71 are formed respectively at positions covering the upper sides of the connecting terminals 61 to 63. The mating terminals 56a, 56b, and 56c are cylindrical metal terminals (see reference). Figure 1B Insert these through holes 71. Thus, the mating terminal 56a of the U phase is electrically connected to the connecting terminal 61, the mating terminal 56b of the V phase is electrically connected to the connecting terminal 62, and the mating terminal 56c of the W phase is electrically connected to the connecting terminal 63.

[0066] Control circuit 56 (refer to) Figure 1B The inverter controls the current flowing to coils U1 to W3 via mating terminals 56a to 56c, connecting terminals 61 to 63, terminal-side leads 51 to 53, and 51a to 53c. The control circuit 56 generates a magnetic field to rotate the rotor 31 through this current, thereby driving and controlling the motor 30.

[0067] Figure 4 This is a schematic top view of the stator unit 18 with neutral point side leads X1 to Z3. Figure 4 The diagram of wire harness block 70 is omitted. Neutral point side leads X1 to Z3 are continuous wirings extending from each coil U1 to W3, from the other end of the conductors forming coils U1 to W3 (the end opposite to the terminal side leads 51a to 53c). Each neutral point side lead X1 to Z3 is essentially covered by a sheath 58a (see reference) made of an insulating elastomer. Figure 5B It is formed by covering the conductor. The neutral point side leads X1 to Z3 are arranged above the coils U1 to W3 and between the outer peripheral wall 42a and the inner peripheral wall 42c.

[0068] Lead neutral point side wire X1 from coil U2, X2 from coil U3, and X3 from coil U1. Lead neutral point side wire Y1 from coil V2, Y2 from coil V3, and Y3 from coil V1. Lead neutral point side wire Z1 from coil W2, Z2 from coil W3, and Z3 from coil W1.

[0069] These neutral point side leads X1 to Z3 extend from coils U1 to W3 towards the second direction D2, and are sequentially merged in the order of neutral point side leads Z1, X1, Y1, Z2, X2, Y2, Z3, X3, Y3. The merged neutral point side leads X1 to Z3 are then inserted into a tubular tube 59 made of an insulating elastomer above coil V1. This tube 59 is positioned above coils V1 and W2, between the outer peripheral wall portion 42a and the inner peripheral wall portion 42c.

[0070] Figure 5A yes Figure 4 A cross-sectional view of tube 59 at Va-Va line and neutral point side leads X1 to Z3. Figure 5B From Figure 5A The side view of tube 59 and neutral point side leads X1 to Z3, viewed in the direction of arrow Vb. It should be noted that... Figure 5B The illustration of a portion of the neutral point side leaders X1 to Z3 that overlap in the vertical direction on the paper is omitted.

[0071] Each neutral point side lead X1 to Z3 is exposed from the sheath 58a before being inserted into the tube 59. By electrically connecting these exposed leads to each other, the neutral point side leads X1 to Z3 are interconnected to form the neutral point 58. In this way, the three-phase coils U1 to W3 are star-connected to each other.

[0072] The tube 59 is used to cover the neutral point 58 to insulate the neutral point 58 from the coils U1 to W3. The tube 59 is formed into a tube bag shape with the end 59a closed by heat-pressing a portion of the end 59a side together after rolling the insulating film into a cylindrical shape and overlapping multiple layers.

[0073] Figure 6A and Figure 6B The diagram schematically shows the cords 60a to 60e used to fix multiple terminal side leads 51 to 53, 51a to 53c, multiple neutral point side leads X1 to Z3, and tube 59 (hereinafter referred to as "tube 59 etc.") to the coil frame 42. Figure 6A This is a top view of stator unit 18. Figure 6B yes Figure 6A A cross-sectional view of stator unit 18 at line VIb-VIb. It should be noted that... Figure 6A, Figure 6B The illustrations of a portion of the terminal side leads 51a to 53c and the neutral point side leads X1 to Z3 that overlap in the vertical direction on the paper are omitted.

[0074] On the outer peripheral wall 42a of the coil holder 42, recesses 42g are formed between the nine coils U1 to W3, each recessed downward from the axial end face 42d. Furthermore, through holes 42h are formed below the nine recesses 42g and between the nine coils U1 to W3, each penetrating the outer peripheral wall 42a radially.

[0075] The tube 59 and the like are fixed to the outer peripheral wall portion 42a by means of a rope 60a-60e that passes through the recess 42g and the through hole 42h. The rope 60a presses the tube 59 and the like against the inner peripheral surface of the outer peripheral wall portion 42a by connecting the recess 42g and the through hole 42h vertically.

[0076] Wires 60b to 60e are wound together with wire 60a on the outer peripheral surface of the outer peripheral wall 42a and extend from the recess 42g or the through hole 42h toward the inner peripheral surface of the outer peripheral wall 42a. On the inner peripheral surface of the outer peripheral wall 42a, wire 60b extends from the recess 42g toward the first direction D1 and downward, and wire 60c extends from the recess 42g toward the second direction D2 and downward. Similarly, wire 60d extends from the through hole 42h toward the first direction D1 and upward, and wire 60e extends from the through hole 42h toward the second direction D2 and upward. These wires 60b to 60e are wound together on the upper side of each coil U1 to W3 and at the center of the circumference. Thus, even at the center of the circumference of each coil U1 to W3, the tube 59 and the like are pressed against the inner peripheral surface of the outer peripheral wall 42a by the wires 60b to 60e.

[0077] The tube 59 and the like are fixed by pressing them against the outer peripheral wall 42a around the entire circumference using the wires 60a to 60e. It should be noted that the terminal side leads 51 to 53 are detached from the coil U1 above the coil by the fixing of the wires 60a to 60e to the outer peripheral wall 42a and are directed toward the wire harness block 70.

[0078] Next, refer to Figure 2 , Figure 7A as well as Figure 7B The structure for assembling the wire harness block 70 to the coil frame 42 will be described. Figure 7A yes Figure 2 A cross-sectional view of stator unit 18 at line VIIa-VIIa. Figure 7B yes Figure 2 A cross-sectional view of stator unit 18 at line VIIb-VIIb. It should be noted that... Figure 7A and Figure 7BIn the diagram, cords 60a to 60e are schematically shown as cord 60.

[0079] It should be noted that in the following description of the wire harness block 70, unless otherwise specified, the radial inner side of shaft C ( Figure 2 The right side of the paper) is set as the right side of the wire harness block 70, and the radial outer side of axis C ( Figure 2 The left side of the paper is designated as the left side of the wire harness block 70. Furthermore, the direction facing the end of the wire harness block 70 on the second direction D2 side is designated as forward, and the opposite side is designated as rearward. The arrows U, D, F, B, L, and R in each attached figure represent the top, bottom, front, rear, left, and right sides of the wire harness block 70, respectively.

[0080] The wire harness block 70 is a box divided into upper and lower parts, and the connecting terminals 61 to 63 are stored between the upper and lower parts. It should be noted that the wire harness block 70 is not limited to being composed of upper and lower parts; it can also be composed of one part, or even three or more parts.

[0081] The wire harness block 70 is mainly positioned above coils W2 and U2, with its rear end extending onto coil V1. That is, the wire harness block 70 is configured to be mounted between coils W2 and U2 and between coils V1 and W2.

[0082] The wire harness block 70 has a base plate 91 that forms the bottom surface (lower surface) of the wire harness block 70. Between the bottom surface of the base plate 91 and the coils W2 and U2, a tube 59 is disposed, including terminal side leads 51a, 52a, 53a, 53b, neutral point side leads Y1, Z1, and neutral point 58.

[0083] Furthermore, the bottom surface of the base plate 91 contacts the axial end faces 42d and 42e of the coil holder 42. The axial end face 42e is located at a lower downward position relative to the axial end face 42d, and the bottom surface of the base plate 91 is configured to absorb the height difference between them. Specifically, the bottom surface of the base plate 91 has downwardly protruding adjustment protrusions 91b and 91c at positions corresponding to the axial end face 42e, and the lower ends of the adjustment protrusions 91b and 91c contact the axial end face 42e.

[0084] like Figure 2 and Figure 7A As shown, a first through hole 91a is formed in the base plate 91 at a portion extending forward from the front wall of the wire harness block 70, penetrating the base plate 91 in the vertical direction. A protrusion 45 inserted into the first through hole 91a protrudes from the axial end face 42d of the coil frame 42. This substantially restricts the movement of the wire harness block 70 relative to the coil frame 42 in directions other than upward.

[0085] Furthermore, the end of the protrusion 45 inserted into the first through hole 91a is located higher than the base plate 91, and the extension 46 extends radially outward from this end toward the shaft C. Thus, a portion of the base plate 91 surrounding the first through hole 91a is vertically opposed to the extension 46. As a result, when the wire harness block 70 is moved upward relative to the coil holder 42, its upward movement is also restricted because the base plate 91 is hooked onto the extension 46.

[0086] The wall portion 91d extends downward from the bottom surface of the base plate 91 and has a limiting surface 91e extending toward the first through hole 91a and protruding from the protrusion 45. It should be noted that in this embodiment, when viewed from above, the first through hole 91a is offset circumferentially to the rear from the front position of the limiting surface 91e. The wall portion 91d is connected to the adjusting protrusion 91c with the limiting surface 91e rising from the adjusting protrusion 91c. With the protrusion 45 inserted into the first through hole 91a, and a portion of the base plate 91 surrounding the first through hole 91a and the protrusion 46 vertically opposed, the limiting surface 91e abuts against the abutting surface 42f, which is the inner peripheral wall surface of the inner peripheral wall portion 42c.

[0087] Therefore, even if it is desired to move the base plate 91 relative to the protruding part 46 in the direction of its extension to release the opposition between the base plate 91 and the protruding part 46, the relative movement can be restricted by the contact between the limiting surface 91e and the abutting surface 42f, thereby suppressing the release of the opposition. As a result, the wire harness block 70 is less likely to detach from the coil holder 42.

[0088] On the other hand, when assembling the wire harness block 70 to the coil holder 42, firstly, with the base plate 91 tilted so that the wall portion 91d is away from the inner peripheral wall portion 42c of the coil holder 42, the protrusion 46 and the protrusion 45 are inserted into the first through hole 91a. It should be noted that the length of the first through hole 91a in the direction in which the protrusion 46 extends is greater than the sum of the extension amount L1 of the protrusion 46 from the protrusion 45 to the end of the protrusion 46 and the thickness L2 in the direction in which the protrusion 46 extends in the dimensions of the protrusion 45. Therefore, the protrusion 45 and the protrusion 46 can be easily inserted into the first through hole 91a.

[0089] After inserting the first through hole 91a, the wall portion 91d of the base plate 91 is tilted to the side using the first through hole 91a as a fulcrum, so that the base plate 91 contacts the axial end faces 42d and 42e of the coil frame 42, and the limiting surface 91e is aligned with the abutment surface 42f. In this way, the wire harness block 70 can be easily assembled to the coil frame 42. The above results in balancing the ease of assembly of the wire harness block 70 to the coil frame 42 and the difficulty of detachment after assembly.

[0090] The extension amount L1 of the protrusion 46 is more than half the thickness L2 of the protrusion 45 inside the first through hole 91a. Thus, by ensuring the extension amount L1 to a certain extent, it is possible to prevent the protrusion 46 from detaching from the first through hole 91a due to deformation of the protrusion 45 and the protrusion 46, thereby releasing the opposition between the base plate 91 and the protrusion 46. Therefore, it is more difficult for the wire harness block 70 to detach from the coil holder 42.

[0091] The base plate 91 is continuous around the entire circumference of the first through hole 91a, and the first through hole 91a is not open around the entire circumference. Therefore, the base plate 91 around the first through hole 91a is less prone to deformation, and the protrusion 46 is prevented from falling out of the first through hole 91a due to deformation, thereby releasing the opposition between the base plate 91 and the protrusion 46. Therefore, the wire harness block 70 is less likely to detach from the coil holder 42.

[0092] Since the terminal-side leads 51-53 extending from the wire harness block 70 are bent circumferentially around the shaft C, the elastic reaction force of the terminal-side leads 51-53 relative to the coil frame 42 of the motor 30 applies a force to the wire harness block 70 radially outward. The abutment surface 42f is the inner peripheral wall surface of the coil frame 42 facing radially inward, so the limiting surface 91e of the wire harness block 70 is pressed against the abutment surface 42f by this elastic reaction force. In this way, the abutment surface 42f and the limiting surface 91e can be easily maintained by the elastic reaction force of the terminal-side leads 51-53, thereby improving the radial positioning accuracy of the wire harness block 70 relative to the coil frame 42.

[0093] like Figure 2 and Figure 7B As shown, a second through hole 91f is formed in the base plate 91 at the portion extending to the left from the left wall of the wire harness block 70, penetrating the base plate 91 in the vertical direction. The second through hole 91f is located away from the first through hole 91a in a direction perpendicular to the direction of extension of the protrusion 46 (the front-rear direction of the wire harness block 70).

[0094] An insertion portion 47, capable of being inserted into the second through hole 91f, protrudes from the axial end face 42d of the coil holder 42. The insertion portion 47 is a pin with its outer circumference fully exposed, unlike the protruding portion 46 which extends radially. The insertion portion 47 is sized to fit into the second through hole 91f with a slight gap.

[0095] After the insertion part 47 is inserted into the second through hole 91f and the wire harness block 70 is assembled to the coil holder 42, even if it is desired to tilt the wire harness block 70 only in the direction of the protrusion part 46 with the first through hole 91a as a fulcrum, the base plate 91 around the second through hole 91f and the insertion part 47 will interfere with each other, making the tilting difficult. On the other hand, by tilting the wire harness block 70 with the first through hole 91a as a fulcrum to raise the straight portion of the connecting wall part 91d and the second through hole 91f, the base plate 91 and the insertion part 47, the contact surface 42f and the limiting surface 91e will not interfere with each other, and it can be easily tilted. With such tilting, the wire harness block 70 can be easily removed from the coil holder 42, or they can be easily assembled. Therefore, if the operator understands the assembly method of the wire harness block 70, the reduction in ease of assembly can be suppressed, and the accidental detachment can be suppressed by limiting the removal method of the wire harness block 70.

[0096] According to the stator unit 18 described above, the bottom surface of the wiring harness block 70 contacts the axial end faces 42d and 42e of the coil frame 42, and when viewed from the C-axis direction, the wiring harness block 70 covers the refrigerant channels between coils W2 and U2, and between coils V1 and W2. Thus, the refrigerant channels between these coils V1, W2, and U2 are sealed off by the wiring harness block 70.

[0097] However, since a portion of the tube 59 covering the neutral point 58 is disposed between the bottom surface of the wiring harness block 70 and the coils V1 and W2, it is possible to prevent the refrigerant passages between each coil U1 to W3 from being further blocked by the tube 59. As a result, the cooling medium can easily pass through multiple refrigerant passages, thus ensuring the cooling efficiency of the coils U1 to W3.

[0098] Three thicker terminal-side leads 51 to 53, formed by a total of nine thin terminal-side leads 51a to 53c, extend from the wiring harness block 70 in the first direction D1. Furthermore, below these three terminal-side leads 51 to 53, two thin terminal-side leads 51a and 53a are arranged on the coil U1. Therefore, the refrigerant passage near the first direction D1 side (between coils U1 and V1) relative to the wiring harness block 70 is narrowed by the terminal-side leads 51 to 53, 51a, and 53a.

[0099] On the other hand, in the vicinity of the wiring harness block 70 on the second direction D2 side (between coils U2 and V2), there are five thin terminal-side leads 51a, 52a, 53a, 51b, and 53b, and no thick terminal-side leads 51 to 53. Thus, in the vicinity of the wiring harness block 70 on the second direction D2 side, compared to the vicinity on the first direction D1 side, the terminal-side leads 51 to 53 and 51a to 53c are not densely packed, thereby expanding the refrigerant passage.

[0100] The end 59a of the closed tube 59 faces the second direction D2 and is located closer to the first direction D1 than the end of the wire harness block 70 in the second direction D2. That is, the tube 59 does not protrude near the second direction D2 relative to the wire harness block 70. As a result, the refrigerant passage that may expand due to the sparse terminal leads 51-53, 51a-53c is sealed by the tube 59, thereby further improving the cooling efficiency of the coils U1-W3.

[0101] Terminal-side leads 51-53, 51a-53c, neutral-point-side leads X1-Z3, and tube 59 are fixed to the outer peripheral wall portion 42a by winding with cords 60a-60e (cords 60). Therefore, on the inner peripheral wall portion 42c side, which is radially opposite to the side where tubes 59 are fixed, the refrigerant passage is less likely to be blocked by tubes 59. That is, the refrigerant passage can be enlarged on the inner peripheral wall portion 42c side, thereby improving the cooling efficiency of coils U1-W3.

[0102] In particular, the cord 60a presses the tube 59 and the like against the outer peripheral wall 42a between each coil U1 to W3 (refrigerant passage). This further enlarges the refrigerant passage on the inner peripheral wall 42c side, thereby further improving the cooling efficiency of coils U1 to W3. Furthermore, since the cords 60b to 60e press the tube 59 and the like against the outer peripheral wall 42a at the circumferential center of each coil U1 to W3, bulging of the tube 59 and the like towards the radially inward side near the cord 60a is prevented. As a result, the refrigerant passage on the inner peripheral wall 42c side can be further enlarged, thereby further improving the cooling efficiency of coils U1 to W3.

[0103] Tube 59 is formed by rolling the membrane into a cylindrical shape and has a predetermined flexibility. Therefore, tube 59 can be deformed by using wires 60a to 60e to flatten it towards the outer peripheral wall 42a. As a result, the refrigerant passage on the inner peripheral wall 42c side can be further enlarged, thereby further improving the cooling efficiency of coils U1 to W3.

[0104] When viewed from the C-axis direction, the end 59a side of tube 59 (crimping portion 59b), the wire harness block 70, and the coil W2, which overlaps only with one neutral point side lead Z1, overlap with coil U2, which overlaps with two or more neutral point side leads X1 and Z1. In this portion that overlaps only with one lead, compared to other portions, the space between the bottom surface of the wire harness block 70 and the coil W2 can be expanded to accommodate the space other than the neutral point side lead Z1. As a result, the size of the space used to accommodate tube 59 in this space is minimized, thus enabling miniaturization of the stator unit 18 (motor 30).

[0105] Here, sometimes the terminal-side leads 51a, 52a, 53a, 53b, the neutral-point-side leads X1, Z1, and tube 59 are sandwiched between the wire harness block 70 and the coils V1, W2, U2 wound on the coil frame 42 in the direction of axis C. In this case, it is possible for the wire harness block 70 to float from the axial end faces 42d and 42e by the elastic reaction force of the terminal-side leads 51a, 52a, 53a, 53b, the neutral-point-side leads X1, Z1, and tube 59.

[0106] However, as described above, the opposition between the base plate 91 and the protrusion 46, and the contact between the limiting surface 91e and the abutting surface 42f, make it difficult for the wire harness block 70 to detach from the coil frame 42. That is, the wire harness block 70 is not likely to float from its state of contact with the axial end faces 42d and 42e of the coil frame 42. As a result, it is possible to suppress the wire harness block 70 from floating from the coil frame 42 due to the elastic reaction force through the tube 59, and to prevent the axial C-direction dimension of the stator unit 18 from increasing due to this floating.

[0107] Because the end 59a of the tube 59 is closed by the flat crimping portion 59b, the tube 59 becomes thinner both vertically and horizontally, except for the end 59a. The crimping portion 59b is formed by heat-pressing a rolled-up cylindrical film vertically. The tube 59 is fixed to the coils V1 and W2 by ropes 60a-60e in a manner consistent with the C-axis direction. This prevents the tube 59 from protruding upwards from the axial end faces 42d and 42e of the coil frame 42, thus preventing the tube 59 from contacting the bottom surface of the wire harness block 70. As a result, the elastic reaction force of the tube 59 can be further suppressed, which can prevent the wire harness block 70 from floating off the coil frame 42, thereby further suppressing the increase in the size of the stator unit 18 in the C-axis direction due to this floating.

[0108] Next, refer to Figure 8A and Figure 8B The second embodiment will be described. In the first embodiment, the case where the first through hole 91a is completely closed was described. In contrast, in the second embodiment, the case where the first through hole 102 is partially open will be described. It should be noted that the same reference numerals are used for the parts that are the same as in the first embodiment, and the following description is omitted. Figure 8A This is a top view of a stator unit having the wire harness block 100 in the second embodiment. Figure 8B This is a 3D view of wire harness block 100.

[0109] A first through hole 102 is formed on the base plate 91 of the wire harness block 100, replacing the first through hole 91a in the first embodiment. Except for the first through hole 102 and its surrounding area, the wire harness block 100 is constructed in the same manner as the wire harness block 70 in the first embodiment.

[0110] A portion of the rear side of the radially outer side of the first through hole 102 opens at the radially outer edge of the base plate 91. Thus, the base plate 91 around and on the front side of the first through hole 102 is formed by a hook portion 103, which is formed by bending the end of the portion extending radially outward into a claw shape.

[0111] When assembling the wire harness block 100 into the coil holder 42, firstly, the insertion part 47 is inserted into the second through hole 91f such that the hook part 103 is positioned radially inward than the protrusion 45, so that the lower surface of the base plate 91 contacts the axial end faces 42d and 42e of the coil holder 42. Then, the hook part 103 is rotated around the insertion part 47, and while pressing the hook part 103 against the protrusion 45, the hook part 103 is elastically deformed, hooking the hook part 103 onto the protrusion 45 below the extension part 46. This allows the wire harness block 100 to be easily assembled into the coil holder 42.

[0112] Furthermore, during assembly, the direction in which the hook 103 is pressed against the protrusion 45 is the same as the direction of the force applied to the wire harness block 100 relative to the coil frame 42 by the elastic reaction force of the terminal side leads 51-53. Therefore, the hook 103 can be pressed against the protrusion 45 and elastically deformed using this elastic reaction force, thereby making it easy to hook the hook 103 onto the protrusion 45.

[0113] It should be noted that even in the second embodiment where the first through hole 102 is opened by the hook 103, the wire harness block 100 can be assembled to the coil holder 42 using the same method as in the first embodiment. Specifically, after inserting the protrusion 45 and the extension 46 into the first through hole 102, the wall portion 91d of the base plate 91 can be tilted with the first through hole 102 as a fulcrum, so that the base plate 91 contacts the axial end face 42e.

[0114] A pair of mounting portions 104, which are hooked onto the wall portion 91d, protrude from the contact surface 42f of the coil frame 42 in the second embodiment. Except for the presence of these mounting portions 104, the coil frame 42 in the first embodiment and the second embodiment are constructed identically.

[0115] A pair of mounting portions 104 protrude radially inward from the abutment surface 42f along both circumferential sides of the wall portion 91d that abuts the limiting surface 91e against the abutment surface 42f, and are formed by bending their ends toward each other into a claw shape. The ends of the mounting portions 104 abut against the radial inner surface of the wall portion 91d. With this pair of mounting portions 104, it is easier to maintain the abutment surface 42f against the limiting surface 91e, and the radial positioning accuracy of the wire harness block 100 relative to the coil frame 42 can be further improved.

[0116] When the pair of mounting portions 104 are hooked onto the wall portion 91d, the wall portion 91d is pressed against the pair of mounting portions 104, causing the pair of mounting portions 104 to elastically deform in a direction away from each other. It should be noted that, as in the first embodiment, after inserting the protrusion 45 into the first through hole 102, the wall portion 91d of the base plate 91 is tilted to the side using the first through hole 102 as a fulcrum, so that the base plate 91 contacts the axial end face 42e, and the mounting portion 104 is hooked onto the wall portion 91d. In this case, the working time is slightly increased from the point where the wall portion 91d is pressed against the pair of mounting portions 104.

[0117] However, in this embodiment, as described above, after the base plate 91 contacts the axial end faces 42d and 42e, the hook portion 103 is rotated around the insertion portion 47, thereby enabling the hook portion 103 to be hooked onto the protrusion 45. Therefore, the mounting portion 104 can be hooked onto the wall portion 91d during this rotation. Thus, even with the mounting portion 104 provided, the working time is hardly increased, and the wire harness block 100 can be easily assembled onto the coil holder 42.

[0118] The present invention has been described above according to embodiments, but the present invention is not limited to any of the above embodiments, and it is easy to deduce that various modifications and variations can be made without departing from the spirit of the present invention. For example, the shape and size relationship of each part such as the wire harness blocks 70, 100, rotor 31, and stator 40 can be appropriately changed. The coils U1 to W3 are not limited to the case where the U phase, V phase, and W phase are arranged sequentially along the second direction D2; the U phase, V phase, and W phase can also be arranged sequentially along the first direction D1.

[0119] In the above embodiment, the case where an electric compressor 11 (motor 30) equipped with wiring harness blocks 70 and 100 is mounted on vehicle 1 has been described, but the embodiment is not limited thereto. Figure 9A As shown, an electric compressor 11 equipped with wiring harness blocks 70 and 100 can also be installed in an air conditioning unit 130 used to supply cool air to the interior of a building. This air conditioning unit 130, like the air conditioning unit 10 described in the above embodiment, generates cool air through an electric compressor 11 that mainly includes a motor 30 and an accumulator 12.

[0120] like Figure 9B As shown, the electric compressor 11 (motor 30) equipped with wiring harness blocks 70 and 100 can also be mounted on the refrigerator 140. The refrigerator 140, like the air conditioning unit 10 described in the above embodiment, generates cold air by using the electric compressor 11, which mainly includes the motor 30 and the accumulator 12, to cool the interior of the refrigerator.

[0121] In the above embodiment, the case where terminal-side leads 51a to 53c extend from each coil U1 to W3 toward the second direction D2 has been described, but this is not a limitation. Terminal-side leads 51a to 53c may also extend from each coil U1 to W3 toward the first direction D1. Alternatively, neutral-point-side leads X1 to Z3 may extend from each coil U1 to W3 toward the first direction D1. The direction in which terminal-side leads 51a to 53c extend may also differ from the direction in which neutral-point-side leads X1 to Z3 extend.

[0122] In the above embodiments, the case where a portion of the tube 59 is disposed between the bottom surface of the wire harness blocks 70 and 100 and the coils V1 and W2 has been described, but this is not a limitation. For example, the entire tube 59 may be disposed between the bottom surface of the wire harness blocks 70 and 100 and the coils V1 and W2. Alternatively, at least a portion of the tube 59 may be disposed between the bottom surface of the wire harness blocks 70 and 100 and the coils W2 and U2. The wire harness blocks 70 and 100 may also be mounted on two or more coils among U1, W1, V2, U3, V3, and W3, with at least a portion of the tube 59 disposed between these coils.

[0123] In the above embodiment, the case where the end 59a of the tube 59 is located further towards the first direction D1 than the end of the wire harness blocks 70, 100 in the second direction D2 is described, but it is not limited to this. The end 59a of the tube 59 may also protrude further towards the second direction D2 than the end of the wire harness blocks 70, 100 in the second direction D2. In this case, it is preferable that the tube 59 does not protrude above the coils U2, V2 near the second direction D2 side relative to the wire harness blocks 70, 100. This prevents the refrigerant passage between coils U2, V2 from being blocked by the tube 59. However, compared to the case where the tube 59 is not located below the wire harness blocks 70, 100 at all, when at least a portion of the tube 59 is located below the wire harness blocks 70, 100, it is less likely to block the refrigerant passage; therefore, the tube 59 may also protrude above the coils U2, V2.

[0124] In the above embodiment, the terminal-side leads 51-53, 51a-53c, neutral-point-side leads X1-Z3, and tube 59 are fixed to the outer peripheral wall portion 42a by winding with ropes 60a-60e, but this is not a limitation. These tubes 59, etc., can also be fixed to the inner peripheral wall portion 42c by winding with ropes. In this case, the refrigerant passage is less likely to be blocked by the tubes 59, etc., on the outer peripheral wall portion 42a side, thus improving the cooling efficiency of coils U1-W3. It should be noted that the winding method of ropes 60a-60e is not limited to the method described in the above embodiment and can be appropriately modified.

[0125] In the above embodiment, the case where the first through hole 91a is offset from the front position of the limiting surface 91e to the rearward side in the circumferential direction has been described, but it is not limited to this. For example, the first through hole 91a may also be offset from the front position of the limiting surface 91e to the front side in the circumferential direction. Alternatively, the first through hole 91a may be configured to be located on the front of the limiting surface 91e. Whether the first through hole 91a is located on the front of the limiting surface 91e or offset from that front position, the limiting surface 91e faces the side of the first through hole 91a.

[0126] In the above embodiment, the case where the limiting surface 91e of the wall portion 91d faces radially outward and the protrusion 46 extends radially outward from the protrusion 45 has been described, but it is not limited to this. If, when viewed from the vertical direction, the direction in which the limiting surface 91e faces is the same as the direction in which the protrusion 46 extends from the protrusion 45, these directions can also be radially inward, circumferential, etc. It should be noted that it is not limited to the case where, when viewed from the vertical direction, a straight line approximately perpendicular to the limiting surface 91e and a straight line passing through the center of the width direction (circumferential direction) of the protrusion 46 are parallel; even if there is a slight deviation from the parallel state (e.g., 10 degrees), it is considered that the direction in which the limiting surface 91e faces is the same as the direction in which the protrusion 46 extends from the protrusion 45.

[0127] Furthermore, the positions of the wall portion 91d, the first through holes 91a and 102, the second through hole 91f, etc., can be appropriately changed, and the positions of the abutment surface 42f, the protrusion 45, and the insertion portion 47 can be changed accordingly. For example, it is not limited to the case where the abutment surface 42f is the inner peripheral wall surface of the inner peripheral wall portion 42c; the abutment surface 42f can also be the inner peripheral wall surface or the outer peripheral wall surface of the outer peripheral wall portion 42a. When the outer peripheral wall surface of the outer peripheral wall portion 42a is set as the abutment surface 42f, the radially inner surface of the wall portion 91d becomes the limiting surface 91e.

[0128] In the above embodiment, the case where the extension amount L1 of the protrusion 46 is more than half of the thickness L2 of the protrusion 45 in the first through hole 91a, and the length of the first through hole 91a in the direction in which the protrusion 46 extends is greater than the sum of the extension amount L1 and the thickness L2, has been described. However, their dimensional relationship can also be appropriately changed.

[0129] Explanation of reference numerals in the attached figures

[0130] 10: Air conditioning unit (vehicle-mounted device); 18: Stator unit; 30: Motor; 40: Stator; 41: Stator core; 41a: (Stator core) Axial end face; 42b: Yoke; 41c: Tooth; 42: Coil frame; 42a: Outer peripheral wall; 42c: Inner peripheral wall; 42d, 42e: (Coil frame) Axial end face; 42f: Abutment surface; 43, U1~U3, V1~V3, W1~W3: Coil; 45: Protrusion; 46: Extension; 51~53, 51a~51c 52a~52c, 53a~53c: Terminal side lead wires; 58: Neutral point; 59: Pipe; 59a: (Pipe) end; 60, 60a~60e: Wire ropes; 61, 62, 63: Connecting terminals; 70, 100: Wire harness blocks; 91: Base plate; 91a, 102: First through hole; 91d: Wall; 91e: Restricting surface; 130: Air conditioning unit; 140: Refrigerator; D1: First direction; D2: Second direction; X1~X3, Y1~Y3, Z1~Z3: Neutral point side lead wires.

Claims

1. A stator unit comprising a cylindrical stator disposed in an electric motor, and an insulating wire harness block in contact with an axial end face of the stator, characterized in that, The stator comprises: The stator core has multiple teeth that protrude radially inward from the yoke. An insulated coil frame is disposed on the axial end face of the stator core; The three-phase coils are formed by wires wound in a concentrated manner around each of the teeth and the coil frame, and multiple coils are arranged circumferentially on the stator. Multiple refrigerant channels are formed between the coils in the circumferential direction and communicate with both sides of the stator in the axial direction. Multiple terminal side leads are continuous with one end of the conductor forming the coil and lead out from each of the coils; Multiple neutral point side leads, continuous to the other end of the conductors forming the coils and led out from each of the coils, form a neutral point by interconnecting the multiple neutral point side leads; and An insulating tube, covering the neutral point and shaped like a closed-end bag. The wiring harness block is an insulated enclosure that houses the three-phase connection terminals located at the ends of multiple terminal-side leads. The bottom surface of the wiring harness block contacts the axial end face of the coil frame opposite to the stator core, thereby covering at least one refrigerant passage when viewed from the axial direction. At least a portion of the tube is disposed between the bottom surface of the wire harness block and the coil in an overlapping manner when viewed from the axial direction.

2. The stator unit according to claim 1, characterized in that, The direction in which the terminal-side lead extends from the wire harness block in the circumferential direction is defined as the first direction, and the side opposite to the first direction is defined as the second direction. The closed tube has its end facing the second direction and is located further to the first direction than the end of the wire harness block in the second direction.

3. The stator unit according to claim 1, characterized in that, The coil frame includes: The outer peripheral wall portion is disposed along the outer side of the radial direction of the coil and protrudes relative to the coil toward a side opposite to the stator core; and The inner peripheral wall portion is disposed along the inner side of the radial direction of the coil and protrudes relative to the coil toward a side opposite to the stator core. Multiple terminal-side leads, multiple neutral-point-side leads, and the conduit are fixed to either the outer peripheral wall or the inner peripheral wall by winding a rope.

4. The stator unit according to claim 3, characterized in that, Let the direction in which the end of the tube in the circumferential direction faces be defined as the second direction. Multiple neutral point side leads extend from each of the coils toward the second direction and merge sequentially. When viewed from the axial direction, the end side of the tube, the wire harness block, and the coil overlap only with one of the neutral point side leads.

5. The stator unit according to claim 1, characterized in that, The wire harness block has: The base plate has the aforementioned bottom surface; A first through hole penetrates the base plate in the axial direction; and The wall portion has a limiting surface facing the side of the first through hole and extends from the bottom surface toward the stator core side. The coil frame includes: The protrusion protrudes from the axial end face of the coil frame and is inserted into the first through hole; The protrusion extends from the end of the protrusion in the same direction as the direction in which the limiting surface faces; as well as The contact surface abuts against the restricting surface. With the abutting surface in contact with the limiting surface, a portion of the base plate surrounding the first through hole is opposed to the protrusion in the axial direction.

6. An electric motor comprising a stator unit according to any one of claims 1 to 5.

7. An air conditioning device, equipped with the electric motor of claim 6.

8. A refrigerator equipped with the electric motor of claim 6.

9. A vehicle-mounted device equipped with the electric motor of claim 6.

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