Stator

Abstract

To provide a technology for effectively cooling connection parts of a plurality of segment coils connected within a slot of a stator core.SOLUTION: A stator has a stator core 12 having a slot extending in an axial direction, at least one first segment coil 44 extending the slot of the stator core 12 in one direction, at least one second segment coil 45 extending in the other direction within the slot of the stator core 12, at least one connection member 60 connecting a tip 48 of at least one first segment coil 44 within the slot of the stator core 12 to a tip 49 of at least one second segment coil 45 respectively, and a coolant passage 20 passing through the inside of the stator core 12. The coolant passage 20 is connected to a section which is a partial section of the slot and where at least one connection member 60 is located.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The technology disclosed in this specification relates to a stator.

Background Art

[0002] A stator in a motor may be configured, for example, by inserting a stator coil into a slot of a stator core. As such stator coils, those composed of a plurality of segment coils divided in the axial direction of the stator and a connecting member connecting the segment coils are known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such segment coils, the thermal resistance at the connection portion between the segment coil and the connecting member may increase. It is desirable to suppress heating of the connection portion in the slot of the stator core.

[0005] This specification provides a technology for effectively cooling the connection portions of a plurality of segment coils connected within a slot of a stator core.

Means for Solving the Problems

[0006] The technology disclosed in this specification is embodied in a stator. This stator includes a stator core having axially extending slots, at least one first segment coil extending in one direction within the slots of the stator core, at least one second segment coil extending in the other direction within the slots of the stator core, at least one connecting member connecting the tip of the at least one first segment coil to the tip of the at least second segment coil within the slots of the stator core, and a refrigerant flow path passing through the interior of the stator core. The refrigerant flow path is connected to a section of a part of the slot where the at least one connecting member is located.

[0007] Within the slots of the stator core, at the connection portion between the segment coil and the connecting member, heating may occur due to an increase in thermal resistance. According to the stator of the present disclosure, in a section of the slot where the connecting member within the slot is located, refrigerant can be supplied to the connection portion for cooling.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] The stator disclosed in this specification includes a stator core having axially extending slots, at least one first segment coil extending in one direction within the slots of the stator core, at least one second segment coil extending in the other direction within the slots of the stator core, at least one connecting member connecting the tip of the at least one first segment coil to the tip of the at least second segment coil within the slots of the stator core, and a refrigerant flow path passing through the interior of the stator core. The refrigerant flow path may be connected to a section of the slots where the at least one connecting member is located.

[0010] Another aspect of the stator disclosed in this specification is that the refrigerant flow path may include a first axially extending refrigerant flow path extending along the axial direction from one end of the stator core, a second axially extending refrigerant flow path extending along the axial direction from the other end of the stator core, a first connecting refrigerant flow path extending from the first axially extending refrigerant flow path to the section, and a second connecting refrigerant flow path extending from the second axially extending refrigerant flow path to the section. By doing so, the refrigerant can be easily supplied to the space for cooling.

[0011] Another aspect of the stator disclosed in this specification is that the refrigerant flow path may include an axially extending refrigerant flow path extending along the axial direction from one end of the stator core to the other end, a first connecting refrigerant flow path extending from a first intermediate position of the axially extending refrigerant flow path to the section of the slots, and a second connecting refrigerant flow path extending from a second intermediate position different from the first intermediate position of the axially extending refrigerant flow path to the section of the slots. By doing so, the refrigerant can be easily supplied to the space for cooling.

[0012] Another aspect of the stator disclosed in this specification is that the refrigerant flow path may include an axial refrigerant flow path extending along the axial direction from one end to the other end of the stator core, and a connecting refrigerant flow path extending from an intermediate position of the axial refrigerant flow path to the section of the slot. By doing so, the refrigerant can be easily supplied to the space for cooling.

[0013] Another aspect of the stator disclosed in this specification is that both sides in the axial direction of the section may be filled with a filler in the slot. By doing so, the refrigerant can be reliably and selectively supplied to the space, and the connection part can be cooled more efficiently.

[0014] Another aspect of the stator disclosed in this specification is that the connection member may be arranged offset in the axial direction of the stator core from the connection members of other segment coils adjacent in the radial direction or circumferential direction of the stator core. By doing so, the connection members are arranged so as not to be adjacent in the radial direction, so these connection members can be cooled efficiently.

[0015] Hereinafter, embodiments of the motor of the present disclosure will be described with reference to the drawings as appropriate. In this specification, when simply referring to the "axial direction", it means the axial direction of the stator core; when simply referring to the "radial direction", it means the radial direction of the stator core; and when simply referring to the "circumferential direction", it means the circumferential direction of the stator core. In the drawings, the axial direction is represented by X and the radial direction is represented by Y.

[0016] (First Embodiment) Figures 1 to 3 relate to the first embodiment. Figure 1 is a plan view of a part of the stator core at its one end, end A. Figure 2 is a cross-sectional view taken along line II-II in Figure 1 showing the cross-sectional structure of the stator core and an enlarged cross-sectional view of the accommodated coil. Figure 3 shows the cross-sectional views taken along lines IIIA-IIIA and IIIB-IIIB in Figure 2.

[0017] FIG. 1 shows a part of the stator 10. The stator 10 in the present embodiment constitutes a motor together with a rotor (not shown). The motor is not particularly limited, and for example, it is a motor generator having functions as an electric motor or a generator. The motor can constitute an e-axle together with an inverter, a gear set, etc., and can constitute a drive device for an electric vehicle.

[0018] The stator 10 is a cylindrical body configured to surround a rotor disposed on its radially inner side. The stator 10 includes a stator core 12, a refrigerant flow path 20 formed in the stator core 12, and a coil 40 wound around the stator core 12.

[0019] The stator core 12 includes a substantially annular core back 14 and a plurality of teeth 16 protruding radially inward from the inner peripheral surface of the core back 14. A slot 18, which is a space for accommodating a part of the coil 40, is formed between the teeth 16 adjacent in the circumferential direction. Since the slot 18 is provided between each pair of teeth 16, the stator core 12 includes a plurality of slots 18.

[0020] The stator core 12 includes a refrigerant flow path 20 through which refrigerant flows axially through the inside of the stator core 12 at a central portion in the circumferential direction of the teeth 16 and close to the core back 14.

[0021] As shown in FIGS. 1 and 2, the refrigerant flow path 20 includes a refrigerant inlet 20a that opens to the end face 12a at the A end, which is one end of the stator core 12, and an outlet 20b that opens to the end face 12b at the B end, which is the other end of the stator core 12. The refrigerant is supplied to the inlet 20a through a refrigerant path provided in a housing that houses the motor, flows through the refrigerant flow path 20, and flows out through the outlet 20b. Note that the refrigerant may be a hydrophilic fluid in addition to a hydrophobic fluid such as oil.

[0022] As shown in FIG. 2, the refrigerant flow path 20 is configured to supply refrigerant to a section 80 (hereinafter, also simply referred to as the connection section) where a plurality of connection portions 70 of the plurality of coils 40 in the slot 18 are arranged. Details of such a refrigerant flow path 20 will be described later.

[0023] Hereinafter, regarding the position along the axial direction in the stator core 12, the refrigerant flow path 20, etc., the side closer to the inlet 20a may be referred to as "upstream", and the direction closer to the outlet 20b may be referred to as "downstream".

[0024] Next, a description will be given of the plurality of coils 40 accommodated in each slot 18, the plurality of first segment coils 44 constituting the plurality of coils 40, and the second segment coils 45. When separately describing the plurality of coils 40, the plurality of first segment coils 44, the plurality of second segment coils 45, and a plurality of elements related thereto, they are respectively described with alphabetical subscripts such as 40a, 44a, 45a, etc., and when not distinguished, they are described omitting the alphabetical subscripts.

[0025] The plurality of coils 40 are wound around the teeth 16 of the stator core 12. As a result, a part of the plurality of coils 40 is accommodated in the slot 18 between the teeth 16. The connection mode and winding mode of the coil 40 are appropriately selected according to the specifications of the motor. For example, the coil 40 may have a configuration in which the U-phase, V-phase, and W-phase coils are star-connected or delta-connected. Further, the coil 40 is wound in various known winding modes such as distributed winding and concentrated winding. The coil 40 is formed by coating a conductor wire 42 made of a conductive material (for example, copper, etc.) with a coil film 43 made of an insulating material. The conductor wire 42 is a rectangular wire with a substantially rectangular cross-sectional shape.

[0026] Each coil 40 is formed, for example, by connecting a first segment coil 44 divided into two parts and a second segment coil 45 by a connecting member 60 into a predetermined shape. The plurality of segment coils 44 and 45 are each configured to be of a convenient length for handling and to be easily connected by a connecting member 60 or the like.

[0027] The first segment coil 44 has an axial portion extending in the slot 18 toward the B end along the axial direction. The tip portion 48 toward the B end of the axial portion is located at approximately the central portion in the axial direction of the slot 18 and is disposed opposite to the tip portion 49 of the second segment coil 45. The tip portion 48 of the first segment coil 44 is in a state where the coil film 43 is peeled off and the conducting wire 42 is exposed. Note that the first segment coil 44 may be formed in a substantially U-shaped body having a pair of axial portions and bent and connected outside the B end of the slot 18.

[0028] Further, the second segment coil 45 has an axial portion extending in the slot 18 toward the A end along the axial direction. The tip portion 49 toward the A end of the axial portion is located at approximately the central portion in the axial direction of the slot 18 and is disposed opposite to the tip portion 48 of the first segment coil 44. The tip portion 49 of the second segment coil 45 is in a state where the coil film 43 is peeled off and the conducting wire 42 is exposed. The second segment coil 45 may also be formed in a substantially U-shaped body similar to the first segment coil 44.

[0029] The first segment coil 44 and the second segment coil 45 are provided with a connection portion 70 that is connected by a connection member 60. When the first segment coil 44 and the second segment coil 45 are connected by the connection member 60, a continuous coil 40 having a predetermined shape is formed. The connection member 60 is a substantially cylindrical body extending in the axial direction, and recesses 62 and 64 for inserting the tip ends 48 and 49 of the first segment coil 44 and the second segment coil 45 into both ends thereof and holding them inside the connection member 60 are provided. The connection member 60 is provided with a conductor portion 66 at the central portion in its length direction. The conductor portion 66 holds the lead wires 42 exposed at the tip ends 48 and 49 of the first segment coil 44 and the second segment coil 45 facing each other at the central portion in the axial direction of the connection member 60, and electrically connects the first segment coil 44 and the second segment coil 45.

[0030] Note that such segment coils and connection members are disclosed in, for example, Japanese Patent Application No. 2018-4509 (Japanese Patent Laid-Open No. 2019-126153).

[0031] Next, the arrangement of the connection portion 70 of the first segment coil 44 and the second segment coil 45 in the slot 18 will be described. A plurality of coils 40 are accommodated in the slot 18 in a predetermined form. The connection portions of the plurality of coils 40 in the slot 18 are provided in a section (hereinafter also referred to as a connection section) 80 extending over a predetermined length in the axial direction of the slot 18, as shown in FIG. 2. In the connection section 80, a filler F selected from known materials such as insulating paper for enhancing the insulation of the plurality of coils 40 is not filled. On the other hand, at least the portions adjacent to the upstream side and the downstream side of the connection section 80 are filled with such a filler F. By doing so, the flow of a liquid such as a refrigerant is inhibited between the connection section 80 and the outside of the connection section 80, and the refrigerant can be selectively made to flow through the connection section 80. Further, the flow resistance of the refrigerant in the connection section 80 can be reduced to enhance the cooling effect.

[0032] In the connection section 80, the connection portions 70 of the plurality of coils 40 are arranged so as not to be adjacent to each other in the radial direction or the circumferential direction. Since the connection portions 70 are easy to heat, by avoiding the adjacency of the connection portions 70, the cooling efficiency by the refrigerant can be improved, and thus the temperature rise in the connection section 80 can be suppressed. For example, as enlarged and shown in FIG. 2, the connection portions 70a and 70b of the coils 40a and 40b adjacent in the radial direction are arranged to be displaced in the axial direction. By doing so, the connection portions 70a and 70b are not adjacent to each other in the radial direction. Similarly, although not shown, the connection portions 70a and 70b of the coils 40a and 40b adjacent in the circumferential direction are also arranged to be displaced in the axial direction, so that the connection portions 70a and 70b are not adjacent to each other in the circumferential direction.

[0033] Furthermore, as enlarged and shown in FIG. 2, on the upstream side adjacent to the connection portion 70a of the first segment coil 44a of the coil 40a, there is provided a reduced-diameter portion 50a whose radial width becomes narrower over a predetermined section, for example, compared to other portions of the axis portion of the first segment coil 44a. The reduced-diameter portion 50a has a rectangular cross section smaller than other portions of the axis portion. The formation section of the reduced-diameter portion 50a generally corresponds to the length of the connection portion 70b of the adjacent other coil 40b. Similarly, on the downstream side adjacent to the connection portion 70b of the second segment coil 45b of the coil 40b, there is provided a reduced-diameter portion 50b whose radial width becomes narrower over a predetermined section, for example, compared to other portions of the axis portion of the second segment coil 45b. The formation section of the reduced-diameter portion 50b generally corresponds to the length of the connection portion 70a of the adjacent other coil 40a. By doing so, the flow resistance of the refrigerant in the connection section 80 can be reduced, and the cooling effect can be enhanced.

[0034] Further, as shown in FIG. 3, in the connection section 80, the wall portion 17a of the tooth 16 that defines the slot 18 and faces the coil 40 may be formed such that the tooth 16 is at least partially thinner so as to be spaced apart from the coil 40 more than the other sections of the slot 18 where the connection section 80 is not defined. By being spaced apart in this way, the flow resistance of the refrigerant in the connection section 80 can be reduced, and the cooling effect can be enhanced. Also, the wall portion 17b of the radially inner end of the tooth 16 that faces the coil 40 may also be formed thin so as to be spaced apart from the coil 40. By being spaced apart in this way, the flow resistance of the refrigerant can be reduced, and the cooling effect can be enhanced.

[0035] Such a stator core 12 is, for example, a laminated steel plate formed by laminating a plurality of electromagnetic steel plates in the thickness direction. Also, for example, it is a powder core formed by press-molding insulated magnetic particles.

[0036] Next, the refrigerant flow path 20 that supplies refrigerant to the connection section 80 will be described in detail. As shown in FIG. 2, the refrigerant flow path 20 includes a first flow path 22 that extends axially from an inlet 20a to a position corresponding to the upstream end of the connection section 80 at the central portion in the circumferential direction of the tooth 16. Also, the refrigerant flow path 20 includes a second flow path 23 that extends axially to reach an outlet 20b at a position corresponding to the downstream end of the connection section 80. The inlet 20a, the first flow path 22, the second flow path 23, and the outlet 20b are on the same axis along the axial direction. Note that the first flow path 22 and the second flow path are examples of the first axial refrigerant flow path and the second axial refrigerant flow path disclosed in this specification.

[0037] The refrigerant flow path 20 further includes, as shown in FIGS. 2 and 3, a first connection flow path 24 that extends from the downstream end of the first flow path 22 toward the connection section 80 of the circumferentially adjacent (right side in FIG. 3) slot 18. The first connection flow path 24 generally reaches the upstream end of the connection section 80 along the circumferential direction. The first connection flow path 24 supplies the refrigerant from the first flow path 22 to the connection section 80. The first connection flow path 24 is an example of the first connection refrigerant flow path disclosed in this specification.

[0038] Further, as shown in FIGS. 2 and 3, the refrigerant flow path 20 includes a second connecting flow path 25 that extends from the downstream end of the connection section 80 toward the second flow path 23. The second connecting flow path 25 generally reaches the second flow path 23 along the circumferential direction. The second connecting flow path 25 allows the refrigerant that has flowed through the connection section 80 to flow out from the outlet 20b via the second flow path 23. The second connecting flow path 25 is an example of the second connecting refrigerant flow path disclosed in this specification.

[0039] Also, as shown in FIGS. 2 and 3, in the section of the stator core 12 corresponding to the connection section 80, the refrigerant flow path does not have a refrigerant flow path along the axial direction. Therefore, after all of the refrigerant passing through the first flow path 22 is supplied to the connection section 80, it flows out through the second flow path 23.

[0040] Next, the cooling effect of the stator 10 and the coil 40 in such a stator 10 will be described. As shown in FIG. 2, when the refrigerant is supplied to the inlet 20a, it flows through the first flow path 22, the first connecting flow path 24, the connection section 80, the second connecting flow path 25, and the second flow path 23, and is discharged from the outlet 20b. As a result, the stator core 12 and the coil 40 are cooled. In particular, it is also supplied to the connection section 80 where the connection portion 70 of the first segment coil 44 and the second segment coil 45 is arranged. Thereby, the connection portion that is likely to have a temperature rise can be effectively cooled, and as a result, the coil 40 can be effectively cooled.

[0041] In the connection section 80, since there is no insulating filler F between the coils 40, the fluidity of the refrigerant can be enhanced and the connection portion 70 can be effectively cooled.

[0042] In the connection section 80, the connection portions 70 of the adjacent coils 40 are arranged so as not to be adjacent in the circumferential direction and the radial direction, so that the fluidity of the refrigerant and the cooling effect can be enhanced. Also, since the connection portion 70 of one of the adjacent coils 40 is adjacent to the small-diameter portion 50 of the other coil 40, the fluidity of the refrigerant can be enhanced and the connection portion 70 can be effectively cooled.

[0043] (Second Embodiment) FIG. 4 relates to the second embodiment. FIG. 4 shows a cross-sectional structure of the stator core 112 of the second embodiment. FIG. 4 corresponds to the cross-section taken along line II-II in FIG. 1. Hereinafter, elements common to the first embodiment will be described using the same reference numerals.

[0044] As shown in FIG. 4, the stator core 112 of the present embodiment has the same configuration as that of the first embodiment, except that it includes a refrigerant flow path 120 having a flow path configuration different from that of the refrigerant flow path 20 of the first embodiment.

[0045] The refrigerant flow path 120 includes a first flow path 122 that communicates from an inlet 20a to an outlet 20b at a central portion in the circumferential direction of the teeth 16. The refrigerant flow path 120 further includes a first connecting flow path 124. The first connecting flow path 124 extends generally along the circumferential direction toward the upstream end of a connection section 80 in a slot 18 adjacent to the first flow path 122 in the circumferential direction (corresponding to the right side in FIG. 4) at the central portion in the axial direction of the stator core 120 (an example of the first intermediate position disclosed in this specification). The first connecting flow path 124 supplies the solvent from the first flow path 122 to the connection section 80. The first flow path 122 is an example of the axial refrigerant flow path disclosed in this specification, and the first connecting flow path 124 is an example of the first connecting refrigerant flow path disclosed in this specification.

[0046] Also, the refrigerant flow path 120 further includes a second connecting flow path 125. The second connecting flow path 125 extends generally along the circumferential direction from a position of the first flow path 122 corresponding to the downstream end of the connection section 80 (an example of the second intermediate position disclosed in this specification) toward the downstream end of the connection section 80. The second connecting flow path allows the refrigerant that has flowed through the connection section 80 to flow out into the first flow path 122. The first connecting flow path 124 and the second connecting flow path 125 are examples of the second connecting refrigerant flow path disclosed in this specification.

[0047] According to the second embodiment, when the refrigerant is supplied to the inlet 20a, it flows through the first flow path 122, the first connecting flow path 124, the second connecting flow path 125, and the first flow path 122, and is discharged from the outlet 20b. As a result, similar to the first embodiment, the stator core 12 and the coil 40 are cooled. Also, similar to the first embodiment, the connection portion 70 of the segment coil, which is likely to have its temperature increased, can be effectively cooled, and as a result, the coil 40 can be effectively cooled. According to the second embodiment, since the refrigerant flow path 120 is provided to penetrate axially along the entire axial direction of the stator core 12, the refrigerant flow path configuration becomes simple, and downstream of the connection section 80, refrigerant with a high cooling effect that has not passed through the connection section 80 can be supplied.

[0048] (Third Embodiment) Figures 5 to 6 relate to the third embodiment. Figure 5 shows a cross-section taken along line II-II in Figure 1 showing the cross-sectional structure of the stator core 112 of the third embodiment, and Figures 6(a) to (c) show cross-sections taken along lines A-A, B-B, and C-C of Figure 5, respectively. Hereinafter, elements common to the first embodiment will be described using the same reference numerals.

[0049] As shown in Figure 5, the stator core 212 of the present embodiment has the same configuration as the first embodiment, except that it is provided with a refrigerant flow path 220 having a flow path configuration different from the refrigerant flow path 20 of the first embodiment, and the tooth width defining the connection section 80 of the slot 18 is narrow.

[0050] As shown in Figure 5, the refrigerant flow path 220 is provided with a first flow path 222 that communicates from the inlet 20a to the outlet 20b at the central portion in the circumferential direction of the teeth 16. The refrigerant flow path 220 further includes a first connecting flow path 224.

[0051] As shown in FIGS. 5 and 6(a) to 6(b), the first communication flow path 224 extends generally along the circumferential direction toward the upstream ends of the connection sections 80 in both of the slots 18 that are adjacent to the first flow path 222 in the circumferential direction (left and right sides in FIG. 6) in the central portion of the stator core 12 in the axial direction. The first communication flow path 224 supplies refrigerant to these connection sections 80. The first flow path 222 is an example of the axial refrigerant flow path disclosed in this specification, and the first communication flow path is an example of the communication refrigerant flow path disclosed in this specification.

[0052] As shown in FIG. 6(c), in these connection sections 80, the width of the teeth 16 is formed narrower than that in the first embodiment. As a result, the width along the circumferential direction of the connection section 80 (the width of the slot 18) is widened. Further, when the width of the teeth 16 becomes narrower, the width between the opposing teeth 16 inside the slot 18 in the radial direction (the opening width of the slot 18) becomes larger.

[0053] According to the third embodiment, when the refrigerant is supplied to the inlet 20a, it flows through the first flow path 222 and is discharged from the outlet 20b. Thereby, the stator core 12 is cooled. Further, the refrigerant is supplied to the connection section 80 via the first communication flow path 224 and flows out radially inward. Thereby, the connection portion 70 of the segment coil that is likely to have a temperature rise can be effectively cooled, and as a result, the coil 40 can be effectively cooled.

[0054] According to the third embodiment, since the refrigerant flow path 220 is provided to penetrate axially along the entire axial direction of the stator core 12, the refrigerant flow path configuration becomes simple, and refrigerant with a high cooling effect that has not passed through the connection section 80 can be supplied downstream of the connection section 80. Further, according to the third embodiment, since only the first communication flow path 224 is provided, the flow path configuration can be simplified. Furthermore, according to the third embodiment, since the width of the teeth 16 is formed narrower, as a result, the width of the slot 18 and the opening width inside the slot 18 in the radial direction are expanded, thereby improving the fluidity of the refrigerant supplied to the connection section 80 toward the inside in the inner diameter direction of the slot 18 and enhancing the cooling effect.

[0055] In the above embodiments, the coil 40 is composed of the first segment coil 44 and the second segment coil 45. However, the present invention is not limited to this, and the coil 40 may be composed of three or more segment coils.

[0056] In the above embodiments, one connection section 80 is provided in the slot 18. However, depending on the splitting mode of the segment coils of the coil 40, a plurality of connection sections 80 may be provided as appropriate.

[0057] In the above embodiments, the first segment coil 44 and the second segment coil 45 are provided with the reduced diameter portion 50 so as to be adjacent to the connection portion of another adjacent segment coil. However, it is not necessarily required to provide the reduced diameter portion 50. Also, the connection portion 70 of the adjacent coils 40 is arranged so as not to overlap in the circumferential direction and / or the radial direction. However, the present invention is not limited to this, and depending on the fluidity of the refrigerant in the connection section 80, at least a part thereof may overlap.

[0058] In the first and second embodiments, it is stated that the width of the teeth 16 may be narrowed and the width of the slot 18 and the opening width inside the slot 18 in the radial direction may be widened. However, in view of the fluidity and cooling performance of the refrigerant, it can be appropriately changed.

[0059] The specific examples of the technology disclosed in this specification have been described in detail above. However, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology illustrated in this specification or the drawings can achieve a plurality of purposes simultaneously, and achieving one of these purposes itself has technical utility.

Explanation of Reference Numerals

[0060] 10 stator, 12, 112, 212 stator core, 20a inlet, 20b outlet, 14 core back, 16 teeth, 18 slots, 20, 120, 220 refrigerant flow path, 22, 122, 222 first flow path, 23, 123 second flow path, 24, 124 first connecting flow path, 25, 125 second connecting flow path, 40 coil, 42 conductor, 43 coil coating 44 first segment coil, 45 second segment coil, 48, 49 tip portions, 50 small diameter portion, 60 connecting member, 62, 64 recesses, 66 conductor portion, 70 connecting portion, 80 connecting section

Claims

1. a stator core having axially extending slots; At least one first segment coil extending in one direction within a slot of the stator core; At least one second segment coil extending in the other direction within the slot of the stator core; At least one connecting member that connects a tip of the at least one first segment coil to a tip of the at least one second segment coil in a slot of the stator core; A coolant flow path passing through the inside of the stator core; Equipped with A stator, wherein the coolant flow passage is connected to a portion of the slot, the portion being in which the at least one connecting member is located.

2. The refrigerant flow path is a first axial refrigerant flow path extending along the axial direction from one end of the stator core; a second axial refrigerant flow passage extending along the axial direction from the other end of the stator core; a first communication refrigerant passage extending from the first axial refrigerant passage to the section of the slot; a second communication refrigerant passage extending from the second axial refrigerant passage to the section of the slot; The stator of claim 1 , comprising:

3. The refrigerant flow path is an axial refrigerant flow path extending along the axial direction from one end to the other end of the stator core; a first communication refrigerant passage extending from a first intermediate location of the axial refrigerant passage to the section of the slot; a second communication refrigerant flow passage extending from a second intermediate location of the axial refrigerant flow passage different from the first intermediate location to the section of the slot; The stator of claim 1 , comprising:

4. The refrigerant flow path is an axial refrigerant flow path extending along the axial direction from one end to the other end of the stator core; a communication refrigerant passage extending from an intermediate location of the axial refrigerant passage to the section of the slot; The stator of claim 1 , comprising:

5. The stator according to claim 1 , wherein the slots on both sides of the section in the axial direction are filled with a filler material.

6. The stator according to claim 5 , wherein the connecting member is arranged offset in the axial direction of the stator core from the connecting members of other segment coils adjacent in the radial or circumferential direction of the stator core.

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