Stator, motor cooling structure, and method for manufacturing stator

Abstract

To provide a stator, a cooling structure of a motor, and a manufacturing method of the stator, capable of improving cooling efficiency of the stator.SOLUTION: A stator 30 includes: a stator core 40 having annular yoke 41, plural teeth 42 projecting from the yoke 41 inwardly in a radial direction, and plural slots 43 formed between the teeth 42 neighboring each other in a circumferential direction; and coils 50 arranged in the slot 43. In the slot 43, a metallic pipe 60 that extends in an axial direction of the stator core 40 and flows coolant therein is provided side by side with the coil 50 in a radial direction of the stator core 40. An outer peripheral surface of the pipe 60 is tightly stuck to both of an inner surface of the slot 43 and an outer surface of the coil 50.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a stator, a cooling structure for a motor, and a manufacturing method for a stator. [Background technology]

[0002] Conventionally, a stator constituting a motor includes a stator core having a plurality of slots and a coil disposed inside the slots. In a motor, the entire stator heats up due to heat generated by the coil when current is passed through it, so the stator is sometimes cooled by spraying a coolant such as oil onto it (see, for example, Patent Document 1).

[0003] In the motor cooling structure described in Patent Document 1, the stator is arranged so that the radial direction and vertical direction of the stator core coincide. A supply passage is provided above the stator to supply coolant to the stator. The supply passage has a main supply passage extending in the axial direction of the stator core above the stator, and multiple sub-supply passages branching off and extending from the main supply passage. The sub-supply passages are oriented toward the coil ends of the coils that protrude from the slots in the axial direction. As a result, coolant is supplied to the coil ends, and the coils are cooled via the coil ends. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-102983 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the motor cooling structure described in Patent Document 1, while the coolant is supplied to the coil ends, the coolant is not supplied to the parts of the coils that are disposed inside the slots, which means there is still room for improvement in terms of cooling the stator. [Means for solving the problem]

[0006] A stator for solving the above problem comprises a stator core having a ring-shaped yoke, a plurality of teeth protruding radially inward from the yoke, and a plurality of slots formed between adjacent teeth in the circumferential direction, and a coil arranged inside the slot, wherein inside the slot is a metal pipe extending in the axial direction of the stator core and through which a refrigerant flows, and is arranged alongside the coil in the radial direction, and the outer surface of the pipe is in close contact with both the inner surface of the slot and the outer surface of the coil.

[0007] According to this configuration, a metal pipe is provided inside the slot. The outer circumferential surface of the pipe is in close contact with both the inner surface of the slot and the outer surface of the coil, so that the stator core and the coil can be cooled through the pipe by flowing a refrigerant inside the pipe. This allows the inside of the stator to be cooled. Therefore, the cooling efficiency of the stator can be improved.

[0008] A method for manufacturing a stator to solve the above problem is a method for manufacturing a stator including a stator core having an annular yoke, a plurality of teeth protruding radially inward from the yoke, and a plurality of slots formed between adjacent teeth in the circumferential direction, and a coil arranged inside the slot, and includes a pipe arrangement process for placing a metal pipe inside the slot that extends along the axial direction of the stator core and through which a refrigerant flows, a coil arrangement process for placing the coil inside the slot, and a pressing process for plastically deforming the pipe by collectively pressing the pipe and the coil arranged inside the slot so that the pipe is in close contact with both the inner surface of the slot and the outer surface of the coil in the circumferential direction of the pipe.

[0009] According to this method, a stator having effects similar to those of the above-mentioned stator can be manufactured. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a motor according to an embodiment. [Diagram 2] FIG. 4 is a cross-sectional view showing the inside of a slot in a stator. [Diagram 3] Cross-sectional view taken along line 3-3 in Figure 1. [Figure 4] Cross-sectional view taken along line 4-4 in Figure 3. [Diagram 5] FIG. 5 is an enlarged cross-sectional view of part A in FIG. 4 . [Figure 6] FIG. 5 is an enlarged cross-sectional view of part B in FIG. [Figure 7] FIG. 5 is an enlarged cross-sectional view of part C in FIG. 4 . [Figure 8] 5 is a cross-sectional view showing a pipe arrangement step in the manufacturing method of the stator. [Figure 9] 5 is a cross-sectional view showing a coil arrangement step in the manufacturing method of the stator. [Figure 10] 5 is a cross-sectional view showing a pressing step in the manufacturing method of the stator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a stator, a motor cooling structure, and a method for manufacturing a stator will be described with reference to FIGS. In each drawing, some of the components may be exaggerated or simplified, and the dimensional ratios of each component may differ from the actual ratios.

[0012] (Motor 10) As shown in Fig. 1, the motor 10 includes a rotor 20 and a stator 30. The rotor 20 and the stator 30 are accommodated in a housing (not shown). The stator 30 is cylindrical. The motor 10 of this embodiment is a so-called inner rotor type in which the rotor 20 is rotatably provided inside the stator 30. The motor 10 is disposed in such a position that the radial direction and the vertical direction of the stator 30 coincide with each other.

[0013] The motor 10 is provided with a refrigerant pipe 90 that discharges a refrigerant toward the stator 30. The refrigerant pipe 90 is disposed inside the housing and above the stator 30. As the refrigerant, for example, automatic transmission oil is used.

[0014] (Rotor 20) Although not shown, the rotor 20 has a cylindrical rotor that is configured with a plurality of magnetic poles and a rotating shaft that is integral with the rotor. For example, a plurality of permanent magnets are housed inside the rotor.

[0015] (Stator 30) As shown in Figs. 1 to 3, the stator 30 includes a stator core 40, a coil 50, a plurality of pipes 60, and resin plates 70, 80. The stator core 40 is cylindrical. The coil 50 is wound around the stator core 40. Each pipe 60 is provided inside the stator core 40. The resin plates 70, 80 are provided on one end surface and the other end surface of the stator core 40 in the axial direction, respectively. Note that Fig. 1 illustrates the resin plate 70 with a part broken away.

[0016] Hereinafter, the axial direction, radial direction, and circumferential direction of the stator core 40 will be simply referred to as the axial direction, radial direction, and circumferential direction, respectively. (Stator core 40) As shown in Fig. 1 and Fig. 2, the stator core 40 has a yoke 41, a plurality of teeth 42, and a plurality of slots 43. The yoke 41 has an annular shape. The plurality of teeth 42 protrude radially inward from the yoke 41 and are spaced apart from one another in the circumferential direction. The slots 43 are formed one by one between adjacent teeth 42 in the circumferential direction. Each slot 43 is open radially inward and on both sides in the axial direction. An insulating paper (not shown) is provided inside each slot 43 to cover the inner surface of the slot 43.

[0017] 1, the stator core 40 has three fixing portions 44 protruding radially outward from the yoke 41. The three fixing portions 44 are provided at intervals from one another in the circumferential direction. Each fixing portion 44 is provided with a bolt hole 44a penetrating the fixing portion 44 in the axial direction. A bolt (not shown) is inserted into the bolt hole 44a and fastened to the housing, thereby fixing the stator 30 to the housing.

[0018] The stator core 40 is formed, for example, by joining together a plurality of electromagnetic steel plates that are laminated in the axial direction. (Coil 50) The coil 50 is composed of three phase windings constituting a U phase, a V phase, and a W phase. Each phase winding is wound across a plurality of teeth 42. Each phase winding is composed, for example, of a plurality of segment coils (not shown) formed in a U-shape and joined together.

[0019] The coil 50 has a conductor and an insulating coating that covers the outer circumference of the conductor. The conductor is made of a metal material such as an aluminum alloy. The insulating coating is not shown in each drawing.

[0020] The cross-sectional shape of the coil 50 perpendicular to the longitudinal direction is, for example, a rectangle having long sides and short sides. 3, the coil 50 has a placement portion 51 and coil ends 52a, 52b. The placement portion 51 is a portion of the coil 50 that is placed inside the slot 43. The coil ends 52a, 52b are portions of the coil 50 that extend from the placement portion 51 on both sides in the axial direction and are portions that are placed outside the slot 43. The placement portions 51 that are placed inside two different slots 43 are connected to each other by the coil ends 52a, 52b.

[0021] As shown in Fig. 2, inside each slot 43, the arrangement portions 51 are arranged in six rows lined up in the radial direction. Each arrangement portion 51 is arranged inside the slot 43 with its long side aligned along the width of the slot 43. In this embodiment, the width of the arrangement portion 51, i.e., the length of the long side, is the same as the width of the slot 43. The outer surfaces of both sides in the width direction of the arrangement portion 51 are in close contact with the inner surface of the slot 43. In addition, the outer surfaces of the arrangement portions 51 adjacent to each other in the radial direction are in close contact with each other in the radial direction.

[0022] (Pipe 60) Each pipe 60 is provided radially outward of the coil 50 inside the slot 43. More specifically, the pipe 60 is provided radially outward of all the arrangement portions 51 inside the slot 43. In this embodiment, one pipe 60 is provided inside each of the slots 43.

[0023] The pipe 60 extends in the axial direction and is made of a metal material such as an aluminum alloy. The cross-sectional shape of the pipe 60 perpendicular to the longitudinal direction is annular. The outer edge and the inner edge of the cross-sectional shape are, for example, rectangular having long sides and short sides.

[0024] "Annular" as used herein refers to any structure that forms a continuous shape with no ends. "Annular" shapes include, but are not limited to, circles, ellipses, and polygons with sharp or rounded corners.

[0025] The pipe 60 is disposed inside the slot 43 with its long side aligned along the width of the slot 43. In this embodiment, the width of the pipe 60, i.e., the length of the long side, is the same as the width of the slot 43. The outer surfaces of both sides in the width direction of the pipe 60 and the outer outer surface of the pipe 60 in the radial direction are in close contact with the inner surface of the slot 43. Furthermore, the inner outer surface of the pipe 60 in the radial direction is in close contact with the outer surface of the arrangement portion 51. Therefore, the outer peripheral surface of the pipe 60 inside the slot 43 is in close contact with both the inner surface of the slot 43 and the outer surface of the arrangement portion 51 over the entire circumferential direction of the pipe 60.

[0026] 3, each pipe 60 has two protrusions 61a and 61b protruding from both axial sides of the slot 43. The end of the protrusion 61a is open in the axial direction, and the end of the protrusion 61b is closed in the axial direction.

[0027] A communication hole 62 that communicates between the inside and outside of the pipe 60 is provided on the outer circumferential surface of the protruding portion 61b. The communication hole 62 opens to a radially outer portion of the outer circumferential surface of the protruding portion 61b. In other words, the communication hole 62 is provided on a portion of the outer circumferential surface of the protruding portion 61b opposite the coil end 52b. The cross-sectional shape of the communication hole 62 is, for example, circular.

[0028] (Resin plate 70,80) 1, the resin plate 70 has an annular portion 71 and a plurality of extending portions 72. The annular portion 71 has a circular ring shape. The extending portions 72 extend radially inward from the annular portion 71 and are spaced apart from one another in the circumferential direction. The resin plate 70 is made of an insulating resin material.

[0029] The annular portion 71 is in contact with an axial end face of the yoke 41. The outer diameter of the annular portion 71 is smaller than the outer diameter of the yoke 41. The annular portion 71 is in contact with the protruding portions 61a of the pipes 60 in the radial direction.

[0030] Each extension portion 72 is in contact with an axial end face of each tooth 42. In a plan view, the extension portion 72 has the same shape as the teeth 42. The resin plate 70 is provided with the same number of extension portions 72 as the teeth 42. Each extension portion 72 is in contact with a coil end 52a in the circumferential direction.

[0031] As shown in Fig. 4, the resin plate 80 has a common structure with the resin plate 70. That is, the resin plate 80 has an annular portion 81 and a plurality of extending portions 82. The annular portion 81 has a circular ring shape. The extending portions 82 extend radially inward from the annular portion 81 and are spaced apart from one another in the circumferential direction. The resin plate 80 is made of an insulating resin material.

[0032] The annular portion 81 is in contact with an axial end face of the yoke 41. The outer diameter of the annular portion 81 is smaller than the outer diameter of the yoke 41. The annular portion 81 is in contact with the protruding portions 61b of the pipes 60 in the radial direction.

[0033] Each extension portion 82 is in contact with an axial end face of each tooth 42. In a plan view, the extension portion 82 has the same shape as the tooth 42. The resin plate 80 is provided with the same number of extension portions 82 as the teeth 42. Each extension portion 82 is in contact with a coil end 52b in the circumferential direction.

[0034] 4 to 6, a plurality of first supply paths 83, a communication path 84, a plurality of second supply paths 85, and a plurality of branched supply paths 86 are provided inside the resin plate 80. The first supply path 83 and the second supply path 85 are examples of supply paths.

[0035] (1st supply route 83) As shown in FIG. 5, each of the first supply passages 83 opens to the outside and inside in the radial direction of the resin plate 80. More specifically, the first supply passages 83 open to the outer peripheral surface and the inner peripheral surface of the annular portion 81. The first supply passages 83 penetrate the annular portion 81 in the radial direction. The first supply passages 83 communicate with the communication holes 62 of the pipe 60. The cross-sectional shape of the first supply passages 83 perpendicular to the longitudinal direction is, for example, circular. The diameter of the first supply passages 83 is, for example, the same as the diameter of the communication holes 62. In this embodiment, the first supply passages 83 and the communication holes 62 are connected without any step.

[0036] As shown in Fig. 4 and Fig. 6, the stator 30 has two pipes 60 in which the opening direction of the communication holes 62 coincides with the horizontal direction. The long sides of the two pipes 60 extend along the vertical direction. The two pipes 60 are provided on opposite sides of the central axis of the stator 30. As shown in Fig. 4, each first supply passage 83 is provided corresponding to each of the multiple pipes 60 located above the two pipes 60.

[0037] Hereinafter, the multiple pipes 60 located above the two pipes 60 may be referred to as an "upper pipe group." The communication holes 62 in each of the pipes 60 included in the upper pipe group are opened so as to be positioned higher toward the outer periphery of the resin plate 80.

[0038] (Communication path 84) The communication passage 84 extends in the circumferential direction around the entire circumference of the annular portion 81. That is, the communication passage 84 has an annular shape. The communication passage 84 communicates with the plurality of first supply passages 83. The cross-sectional shape of the communication passage 84 perpendicular to the longitudinal direction is, for example, a circular shape.

[0039] (Second supply route 85) 6 and 7, each second supply passage 85 opens to the inside in the radial direction of the resin plate 80. More specifically, the second supply passages 85 open to the inner circumferential surface of the annular portion 81. The second supply passages 85 branch off and extend radially inward from the communication passage 84. In other words, the multiple second supply passages 85 are communicated with each other by the communication passage 84. The cross-sectional shape of the second supply passages 85 perpendicular to the longitudinal direction is, for example, circular.

[0040] 4, each second supply passage 85 is provided corresponding to each of the multiple pipes 60 excluding the upper pipe group among all the pipes 60. Therefore, all the second supply passages 85 are located lower than all the first supply passages 83. Each of the second supply passages 85 located lower than the uppermost second supply passage 85 extends from the communication passage 84 so as to be located higher as it goes toward the inner periphery of the resin plate 80.

[0041] (Branch supply path 86) 6, each branch supply passage 86 branches off and extends from the communication passage 84. Each branch supply passage 86 is located between two second supply passages 85 adjacent to each other in the circumferential direction. The branch supply passage 86 extends at an incline with respect to the two second supply passages 85. More specifically, the branch supply passage 86 extends at an incline so as to be positioned lower from the communication passage 84 toward the inner periphery of the resin plate 80. The cross-sectional shape of the branch supply passage 86 perpendicular to the longitudinal direction is, for example, circular.

[0042] The branch supply passage 86 opens to a side surface of the extension portion 82. Although not shown, an end of the branch supply passage 86 extends in a direction away from the stator core 40 in the axial direction and opens to an end face in the axial direction of the resin plate 80. This allows the refrigerant to flow inside the branch supply passage 86 because the branch supply passage 86 is not blocked by the outer peripheral surface of the coil end 52b.

[0043] (Refrigerant pipe 90) As shown in Fig. 3, the refrigerant pipe 90 has a plurality of discharge ports 91, 92, 93, and 94 from which the refrigerant is discharged. In this embodiment, the refrigerant pipe 90 has three discharge ports 91, 92, 93, and 94. Each discharge port 91 discharges the refrigerant toward the coil end 52a. Each discharge port 92 discharges the refrigerant toward the outer circumferential surface of the stator core 40. Each discharge port 93 discharges the refrigerant toward the first supply passage 83 of the resin plate 80. Each discharge port 94 discharges the refrigerant toward the coil end 52b.

[0044] A pump (not shown) is connected to the refrigerant pipe 90. When the pump is driven, the refrigerant is discharged from each of the discharge ports 91, 92, 93, and 94. 4, the three discharge ports 93 are provided at intervals from one another in the circumferential direction of the refrigerant pipe 90. The same applies to the discharge ports 91, 92, and 94.

[0045] (Cooling of the motor 10) Next, the cooling mode of the motor 10 will be described with reference to Figures 3 to 7. In each figure, the flow of the refrigerant is indicated by arrows.

[0046] 3, the refrigerant discharged from discharge port 91 is supplied to coil end 52a. The refrigerant discharged from discharge port 92 is supplied to stator core 40. The refrigerant discharged from discharge port 93 is supplied to resin plate 80. The refrigerant discharged from discharge port 94 is supplied to coil end 52b.

[0047] As shown in Fig. 5, the refrigerant discharged from the discharge port 93 flows into the first supply passage 83. The refrigerant that has flowed into the first supply passage 83 flows into the inside of the pipe 60 and into the communication passage 84, which are connected to the first supply passage 83. As shown in Fig. 3, the refrigerant that has flowed into the inside of the pipe 60 flows in the axial direction from the protruding portion 61b toward the protruding portion 61a. As a result, the refrigerant that has flowed inside the pipe 60 flows out from the protruding portion 61a and is supplied to the coil end 52a.

[0048] 6, the refrigerant that flows into the communication passage 84 flows into a second supply passage 85 and a branch supply passage 86 that are each connected to the communication passage 84. The refrigerant that flows into the second supply passage 85 flows into the inside of the pipe 60. The refrigerant that flows into the branch supply passage 86 is supplied to the coil end 52b.

[0049] 7, the refrigerant that has flowed into the communication passage 84 is stored in the lower part of the communication passage 84. When the liquid level of the refrigerant stored inside the communication passage 84 reaches the inner surface of the pipe 60 through the second supply passage 85 provided in the lower part of the resin plate 80, the refrigerant flows into the inside of the pipe 60. As a result, the refrigerant flows inside the pipe 60.

[0050] In this manner, the coolant flows between the inside and outside of the stator 30, whereby the entire stator 30 is cooled. (Method of manufacturing the stator 30) The manufacturing method of the stator 30 includes a pipe arrangement step, a coil arrangement step, and a pressing step. In the manufacturing method of the stator 30 of this embodiment, the pipe arrangement step, the coil arrangement step, and the pressing step are performed in this order.

[0051] (Pipe placement process) 8, in the pipe arrangement step, the pipe 60 is arranged inside the slot 43. At this time, the width of the pipe 60 is smaller than the width of the slot 43. That is, in the pipe arrangement step, the pipe 60 is arranged inside the slot 43 with a gap between the pipe 60 and the slot 43 in the width direction.

[0052] (Coil placement process) 9, in the coil arrangement step, the arrangement portion 51 of the coil 50 is arranged inside the slot 43 in which the pipe 60 is arranged. At this time, the width of the arrangement portion 51 is smaller than the width of the slot 43. That is, in the coil arrangement step, the arrangement portion 51 is arranged inside the slot 43 with a gap between the arrangement portion 51 and the slot 43 in the width direction.

[0053] In the coil arrangement process, the six arrangement portions 51 are arranged radially inside the slot 43. At this time, inside the slot 43, the six arrangement portions 51 and one pipe 60 are arranged in order from the inside to the outside in the radial direction.

[0054] (Pressing process) As shown in FIGS. 9 and 10, in the pressing step, the respective arrangement portions 51 arranged inside the slots 43 and the pipe 60 are pressed collectively radially outward by a pressing jig 100.

[0055] The pressing jig 100 has a pressing surface 101 that presses the arrangement portion 51. The pressing surface 101 extends in the axial direction. The length of the pressing surface 101 in the axial direction is greater than the length of the slot 43 in the axial direction. The width of the pressing jig 100 is the same as the width of the slot 43.

[0056] In addition, the width of the pressing jig 100 being the same as the width of the slot 43 does not only mean that they are exactly the same, but also means that the width of the pressing jig 100 is slightly smaller than the width of the slot 43 to the extent that radial movement of the pressing jig 100 within the slot 43 is possible.

[0057] When each of the arrangement portions 51 and the pipe 60 are pressed by the pressing jig 100, each of the arrangement portions 51 and the pipe 60 is plastically deformed along the inner surface of the slot 43. At this time, the width of each of the arrangement portions 51 and the width of the pipe 60 become the same as the width of the slot 43. As a result, the outer circumferential surface of the pipe 60 is in close contact with both the inner surface of the slot 43 and the outer surface of the arrangement portion 51 over the entire circumferential direction of the pipe 60.

[0058] The above-mentioned process is carried out for each slot 43 to manufacture the stator 30. The operation and effects of this embodiment will be described.

[0059] (1) The stator 30 includes a stator core 40 having a yoke 41, a plurality of teeth 42, and a plurality of slots 43, and a coil 50 disposed inside the slot 43. Inside the slot 43, a metal pipe 60 extending in the axial direction and through which a refrigerant flows is provided alongside the coil 50 in the radial direction. The outer circumferential surface of the pipe 60 is in close contact with both the inner surface of the slot 43 and the outer surface of the coil 50.

[0060] According to this configuration, a metal pipe 60 is provided inside the slot 43. The outer circumferential surface of the pipe 60 is in close contact with both the inner surface of the slot 43 and the outer surface of the coil 50, so that the stator core 40 and the coil 50 can be cooled through the pipe 60 by flowing a refrigerant inside the pipe 60. This allows the inside of the stator 30 to be cooled. Therefore, the cooling efficiency of the stator 30 can be improved.

[0061] (2) The pipe 60 is provided inside the slot 43 and radially outward of the coil 50. The outer circumferential surface of the pipe 60 is in close contact with both the inner surface of the slot 43 and the outer surface of the coil 50 over the entire circumferential direction of the pipe 60.

[0062] According to this configuration, the outer circumferential surface of the pipe 60 comes into close contact with both the stator core 40 and the coil 50 over a wider area, facilitating heat transfer between the stator core 40 and the coil 50 and the pipe 60. Therefore, the cooling efficiency of the stator 30 can be further improved.

[0063] (3) The stator 30 includes a resin plate 80 provided on an end surface in the axial direction of the stator core 40. The pipe 60 has a protruding portion 61b protruding from the slot 43. A communication hole 62 that communicates between the inside and the outside of the pipe 60 is provided on the outer circumferential surface of the protruding portion 61b. A first supply passage 83 and a second supply passage 85 that open in the radial direction and supply a refrigerant to the communication hole 62 are provided inside the resin plate 80.

[0064] According to this configuration, the coolant is supplied to the inside of the pipe 60 via the first supply passage 83 and the second supply passage 85 provided inside the resin plate 80. As a result, the coolant flows inside the resin plate 80, so that both the stator core 40 and the resin plate 80 are cooled. Therefore, the cooling efficiency of the stator 30 can be further improved.

[0065] (4) A pipe 60 is provided inside each slot 43. A plurality of first supply passages 83 that supply refrigerant to the communication holes 62 of each pipe 60, and communication passages 84 that extend in the circumferential direction and communicate with each of the first supply passages 83 are provided inside the resin plate 80.

[0066] According to this configuration, the coolant is distributed to each of the first supply paths 83 via the communication paths 84. This allows the coolant to flow inside the multiple pipes 60. Therefore, a wider area inside the stator 30 can be cooled.

[0067] (5) Within the resin plate 80, the branch supply passage 86 is provided, which branches off from the communication passage 84 and supplies the coolant toward the coil end 52b. When the stator 30 is disposed so that the radial direction and the vertical direction of the stator core 40 coincide with each other, the refrigerant flowing through the communication passage 84 becomes less likely to flow into the second supply passage 85 that opens in the radial direction in the lower vertical portion of the stator 30. Therefore, the refrigerant becomes less likely to flow into the inside of the pipe 60 via the second supply passage 85.

[0068] In this regard, if the stator 30 is positioned such that the branch supply passage 86 is located further downward as it is farther away from the communicating passage 84, as in this embodiment, the refrigerant flows into the branch supply passage 86. This makes it easier for the refrigerant to be supplied to the coil ends 52b via the branch supply passage 86. This makes it possible to cool the coil ends 52b of the coil 50 that are arranged next to the pipe 60 into which the refrigerant has difficulty flowing.

[0069] (6) Motor 10 includes stator 30 arranged such that the radial direction coincides with the vertical direction, and refrigerant pipe 90 arranged vertically above stator 30 and discharging refrigerant toward stator 30. Refrigerant pipe 90 has discharge port 93 that discharges refrigerant toward first supply path 83 of resin plate 80.

[0070] With this configuration, the refrigerant discharged from the discharge port 93 of the refrigerant pipe 90 easily flows into the first supply passage 83 of the resin plate 80. Therefore, the refrigerant is easily supplied smoothly to the inside of the pipe 60 via the first supply passage 83. This makes it possible to cool the inside of the stator 30. Therefore, the cooling efficiency of the stator 30 can be improved.

[0071] (7) The manufacturing method of the stator 30 includes a pipe arrangement step, a coil arrangement step, and a pressing step. In the pipe arrangement step, a metal pipe 60 extending along the axial direction and through which a refrigerant flows is arranged inside the slot 43. In the coil arrangement step, a coil 50 is arranged inside the slot 43. In the pressing step, the pipe 60 and the coil 50 arranged inside the slot 43 are pressed together, thereby plastically deforming the pipe 60 so that the pipe 60 is in close contact with both the inner surface of the slot 43 and the outer surface of the coil 50 in the circumferential direction of the pipe 60.

[0072] According to this method, it is possible to manufacture the stator 30 that exhibits an effect similar to the above-mentioned effect (1). <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0073] The coil 50 and the pipe 60 may be made of a metal material other than an aluminum alloy, such as a copper alloy. The coil 50 and the pipe 60 may be made of different metal materials.

[0074] The number of arrangement portions 51 arranged inside one slot 43 may be changed as appropriate, and may be, for example, eight. A gap may be provided in the circumferential direction between the extension portion 82 of the resin plate 80 and the coil end 52b. In this case, the branch supply passage 86 does not need to be open in the axial direction, and may be open only to the side surface of the extension portion 82.

[0075] A plurality of pipes 60 may be provided inside each slot 43 . Both the protruding portion 61a and the protruding portion 61b of the pipe 60 may be open in the axial direction. In this case, the flow path cross-sectional area of ​​the protruding portion 61a may be set smaller than the flow path cross-sectional area of ​​the protruding portion 61b so that the flow rate of the refrigerant flowing out from the protruding portion 61b is set to be larger than the flow rate of the refrigerant flowing out from the protruding portion 61a.

[0076] The pipe 60 may be provided inside the slot 43 between the arrangement parts 51 arranged in the radial direction, or may be provided radially inward from all the arrangement parts 51. In these cases, for example, it is preferable that the communication hole 62 is provided on the outer surface in the width direction of the pipe 60, and the first supply path 83 and the second supply path 85 open to the side surface of the extension part 82. In the manufacture of the stator 30 in which the pipe 60 is provided between the arrangement parts 51, the first coil arrangement process, the pipe arrangement process, the second coil arrangement process, and the pressing process are performed in this order. In the first coil arrangement process, some of the arrangement parts 51 are arranged inside the slot 43. In the second coil arrangement process, the remaining arrangement parts 51 are arranged inside the slot 43 in which some of the arrangement parts 51 and the pipe 60 are arranged. In the manufacture of the stator 30 in which the pipe 60 is provided radially inward from all the arrangement parts 51, the pipe process is performed after the coil arrangement process.

[0077] The refrigerant pipe 90 may have a main flow passage extending in the axial direction, and a sub-flow passage branching off from the main flow passage and having a discharge port 93 provided therein. The branch supply passage 86 may extend at an incline so as to move away from the stator core 40 in the axial direction as it goes from the communication passage 84 toward the coil end 52b.

[0078] The branch supply passage 86 may be omitted from the resin plate 80 . In the above embodiment, one pipe 60 is provided inside each slot 43, but the pipe 60 may be provided inside at least one of the multiple slots 43. That is, there may be a mixture of slots 43 with pipes 60 provided and slots 43 without pipes 60 provided. In this case, it is preferable to provide a columnar dummy member having the same outer shape as the pipe 60 in the slots 43 without the pipe 60. This makes it possible to prevent the position of the coil 50 inside each slot 43 from differing from one slot 43 to another.

[0079] The communication passage 84 may extend in an arc shape. That is, the communication passage 84 may have two ends located opposite each other in the circumferential direction. In this case, it is preferable that the two ends are located in the lower part of the stator 30.

[0080] The protruding portions 61a, 61b may be omitted from the pipe 60. In this case, the end portion of the pipe 60 that opens in the axial direction may be flush with the axial end face of the stator core 40. In this configuration, the end portion is covered from the axial direction by the resin plate 80, and a first supply passage 83 and a second supply passage 85 that communicate with the end portion can be provided.

[0081] The refrigerant pipe 90 may be directly connected to the protruding portion 61b, or a piping extending from the refrigerant pipe 90 may be connected to the protruding portion 61b. In this case, the resin plates 70, 80 may be omitted from the stator 30.

[0082] The resin plate 80 may have only one of the first supply path 83 and the second supply path 85 as a supply path. When the resin plate 80 has only the second supply path 85 as a supply path, the resin plate 80 may have an introduction path that opens to the outside in the radial direction of the annular portion 81 and introduces the refrigerant into the communication path 84. In this case, the refrigerant flows into the second supply path 85 via the introduction path and the communication path 84.

[0083] The outer peripheral surface of the pipe 60 inside the slot 43 does not have to be in close contact with both the inner surface of the slot 43 and the outer surface of the coil 50 over the entire circumferential direction of the pipe 60. The outer peripheral surface of the pipe 60 inside the slot 43 may have a portion that is not in contact with either the inner surface of the slot 43 or the outer surface of the coil 50 in the circumferential direction of the pipe 60. In other words, a partial gap may be provided between the outer peripheral surface of the pipe 60 and the inner surface of the slot 43. Similarly, a partial gap may be provided between the outer surface of the coil 50 and the inner surface of the slot 43. [Explanation of symbols]

[0084] 10…Motor 20…Rotor 30…Stator 40…Stator core 41…York 42…Teeth 43…Slot 44…Fixed part 44a...Bolt hole 50…Coil 51…Arrangement section 52a, 52b... Coil end 60…Pipe 61a, 61b...Protruding part 62...Communication hole 70,80…Resin plate 71, 81…Annular section 72,82...extension part 83...1st supply route (supply route) 84…Communication path 85…Second supply route (supply route) 86…Branch supply line 90…Refrigerant pipe 91,92,93,94…Discharge port 100...Pressing tool 101...Pressing surface

Claims

1. A stator comprising: a stator core having an annular yoke, a plurality of teeth protruding radially inward from the yoke, and a plurality of slots formed between adjacent teeth in a circumferential direction; and a coil disposed inside the slots, a resin plate provided on an end surface of the stator core in an axial direction, A metal pipe extending in the axial direction and through which a refrigerant flows is provided inside each of the plurality of slots and is arranged alongside the coil in the radial direction, The outer circumferential surface of the pipe is in intimate contact with both the inner surface of the slot and the outer surface of the coil, the pipe has a protruding portion protruding from the slot beyond the end surface in the axial direction, A communication hole that communicates between the inside and the outside of the pipe is provided on an outer circumferential surface of the protruding portion, The resin plate is provided therein with a plurality of supply passages that open in the radial direction and supply the refrigerant to the communication holes of each of the pipes, a communication passage that extends in the circumferential direction and connects each of the supply passages, and a branch supply passage that branches off and extends from the communication passage and supplies the refrigerant toward a coil end of the coil that protrudes from the slot in the axial direction. Stator.

2. The pipe is provided inside the slot and outwardly of the coil in the radial direction, The outer circumferential surface of the pipe is in close contact with both the inner surface of the slot and the outer surface of the coil over the entire circumferential direction of the pipe. The stator according to claim 1 .

3. The stator according to claim 1 or 2, which is arranged so that the radial direction and the vertical direction coincide with each other; a refrigerant pipe disposed vertically above the stator and configured to discharge the refrigerant toward the stator, The refrigerant pipe has a discharge port that discharges the refrigerant toward the supply path of the resin plate. Motor cooling structure.

4. A method for manufacturing a stator including a stator core having an annular yoke, a plurality of teeth protruding radially inward from the yoke, and a plurality of slots formed between adjacent teeth in a circumferential direction, and a coil disposed inside the slots, a pipe arrangement step of arranging metal pipes inside the slots, the metal pipes extending along the axial direction of the stator core and through which a refrigerant flows; a coil placement step of placing the coil inside the slot; and a pressing process for pressing the pipe and the coil arranged inside the slot together to plastically deform the pipe so that the pipe comes into close contact with both the inner surface of the slot and the outer surface of the coil in a circumferential direction of the pipe. A method for manufacturing a stator.

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