stata

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 stator coils into slots of a stator core. As such stator coils, those composed of segment coils divided into a plurality in the axial direction of the stator and connecting members 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 of 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 the slots of a stator core.

Means for Solving the Problems

[0006] The technology disclosed herein is embodied in a stator. The stator comprises 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, respectively, 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 portion of the slots, the portion in which the at least one connecting member is located.

[0007] Within the slots of the stator core, the connection portion between the segment coil and the connecting member may overheat due to increased thermal resistance. According to the stator of this disclosure, in a portion of the section within the slot where the connecting member is located, the connection portion can be cooled by supplying a coolant. [Brief explanation of the drawing]

[0008] [Figure 1] This is a plan view of a part of the stator of the first embodiment at one end (end A). [Figure 2] Figure 1 shows a cross-sectional view of the stator core along line II'-II'' and an enlarged cross-sectional view of the housed coil, illustrating the cross-sectional structure of the stator core in the first embodiment. [Figure 3] Figure 2 shows the cross-sectional views along the line IIIA-IIIA and the line IIIB-IIIB. [Figure 4] This is a cross-sectional view taken along line II-II in Figure 1, showing the cross-sectional structure of the stator core of the second embodiment. [Figure 5] This is a cross-sectional view taken along line II-II in Figure 1, showing the cross-sectional structure of the stator core of the third embodiment. [Figure 6] This figure shows the cross-sections along line AA (a), line BB (b), and line CC (c) of Figure 5. [Modes for carrying out the invention]

[0009] A stator disclosed herein comprises 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, respectively, within the slots of the stator core; and a refrigerant flow path passing through the interior of the stator core, wherein the refrigerant flow path may be connected to a portion of the slots, the portion in which the at least one connecting member is located.

[0010] Another embodiment of the stator disclosed herein may have a refrigerant flow path comprising: a first axial refrigerant flow path extending axially from one end of the stator core; a second axial refrigerant flow path extending axially from the other end of the stator core; a first connecting refrigerant flow path extending from the first axial refrigerant flow path to the section; and a second connecting refrigerant flow path extending from the second axial refrigerant flow path to the section. This allows for easy supply of refrigerant to the space for cooling.

[0011] Another embodiment of the stator disclosed herein may have a refrigerant flow path comprising: an axial refrigerant flow path extending axially from one end of the stator core to the other; a first connecting refrigerant flow path extending from a first intermediate position of the axial refrigerant flow path to the section of the slot; and a second connecting refrigerant flow path extending from a second intermediate position different from the first intermediate position of the axial refrigerant flow path to the section of the slot. This allows for easy supply of refrigerant to the space for cooling.

[0012] Another embodiment of the stator disclosed herein may have a refrigerant flow path comprising an axial refrigerant flow path extending along the axial direction from one end to the other of the stator core, and a connecting refrigerant flow path extending from an intermediate position in the axial refrigerant flow path to the section of the slot. This allows for easy supply of refrigerant to the space for cooling.

[0013] Another embodiment of the stator disclosed herein is such that both sides of the section in the axial direction are filled with a filler material within the slot. This ensures that the coolant is reliably and selectively supplied to the space, allowing for more efficient cooling of the connection portion.

[0014] Another embodiment of the stator disclosed herein is such that the connecting members are offset in the axial direction from the connecting members of other segment coils adjacent to the stator core in the radial or circumferential direction. This arrangement ensures that the connecting members are not adjacent in the radial direction, thereby allowing for efficient cooling of these connecting members.

[0015] Embodiments of the motor described herein will be described below with reference to the drawings as appropriate. In this specification, "axial direction" refers to the axial direction of the stator core, "radial direction" refers to the radial direction of the stator core, and "circumferential direction" refers to the circumferential direction of the stator core. In the figures, the axial direction is represented as X and the radial direction as 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 one end, end A; Figure 2 is a cross-sectional view of the stator core shown by line II-II in Figure 1 and an enlarged cross-sectional view of the housed coil; and Figure 3 shows the cross-sectional view of line IIIA-IIIA and line IIIB-IIIB in Figure 2.

[0017] FIG. 1 shows a part of the stator 10. The stator 10 in this embodiment constitutes a motor together with a rotor (not shown). The motor is not particularly limited, but 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 adjacent teeth 16 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 at an end face 12a of the A end, which is one end of the stator core 12, and an outlet 20b that opens at an end face 12b of 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 Figure 2, the refrigerant flow path 20 is configured to supply refrigerant to the section (hereinafter simply referred to as the connection section) 80 in which multiple connection portions 70 of multiple coils 40 in the slot 18 are located. Details of this refrigerant flow path 20 will be described later.

[0023] Hereinafter, with respect to the axial position in the stator core 12, 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, we will describe the multiple coils 40 housed in each slot 18, and the multiple first segment coils 44 and second segment coils 45 that constitute the multiple coils 40. When describing the multiple coils 40, the multiple first segment coils 44, the multiple second segment coils 45, and the multiple elements related thereto, we will use subscript letters such as 40a, 44a, 45a, etc., to indicate them separately. When not distinguishing between them, we will omit the subscript letters.

[0025] Multiple coils 40 are wound around the teeth 16 of the stator core 12. As a result, a portion of the multiple coils 40 are housed in the slots 18 between the teeth 16. The connection and winding configuration of the coils 40 are appropriately selected according to the specifications of the motor. For example, the coils 40 may be configured with U-phase, V-phase, and W-phase coils in a star connection or delta connection. The coils 40 can also be wound in various known winding configurations such as distributed winding or concentrated winding. The coils 40 consist of a conductor 42 made of a conductive material (e.g., copper) covered with a coil film 43 made of an insulating material. The conductor 42 is a rectangular wire with a roughly rectangular cross-section.

[0026] Each coil 40 is formed into a predetermined shape by connecting, for example, a first segment coil 44 and a second segment coil 45, which are divided into two parts, with a connecting member 60. The multiple segment coils 44 and 45 are each of a length that is convenient for handling and are divided to facilitate connection with the connecting member 60, etc.

[0027] The first segment coil 44 has an axial portion that extends within the slot 18 toward end B along the axial direction. The tip portion 48 of the axial portion toward end B is located approximately in the axial center of the slot 18 and is positioned opposite the tip portion 49 of the second segment coil 45. The tip portion 48 of the first segment coil 44 has the coil coating 43 peeled off, exposing the conductor 42. The first segment coil 44 may also be formed as a substantially U-shaped body having a pair of axial portions and bent and connected outside the B end of the slot 18.

[0028] Furthermore, the second segment coil 45 has an axial portion that extends within the slot 18 toward end A along the axial direction. The tip portion 49 of the axial portion toward end A is located approximately in the axial center of the slot 18 and is positioned opposite the tip portion 48 of the first segment coil 44. The tip portion 49 of the second segment coil 45 has the coil coating 43 peeled off, exposing the conductor 42. The second segment coil 45 may also be formed into a substantially U-shape similar to the first segment coil 44.

[0029] The first segment coil 44 and the second segment coil 45 are provided with a connecting portion 70 connected by a connecting member 60. The first segment coil 44 and the second segment coil 45 are connected by the connecting member 60 to form a continuous coil 40 of a predetermined shape. The connecting member 60 is a substantially cylindrical body extending in the axial direction, and has recesses 62 and 64 at both ends into which the respective tip portions 48 and 49 of the first segment coil 44 and the second segment coil 45 are inserted and held inside the connecting member 60. The connecting member 60 has a conductor portion 66 in the center of its longitudinal direction. The conductor portion 66 holds the conductors 42 exposed at the tip portions 48 and 49 of the first segment coil 44 and the second segment coil 45, which are facing each other in the axial central portion of the connecting member 60, and is configured to provide electrical connection between the first segment coil 44 and the second segment coil 45.

[0030] Such segment coils and connecting members are disclosed, for example, in Japanese Patent Application No. 2018-4509 (Japanese Patent Publication No. 2019-126153).

[0031] Next, the arrangement of the connection portion 70 between the first segment coil 44 and the second segment coil 45 in the slot 18 will be described. Multiple coils 40 are housed in a predetermined configuration in the slot 18. As shown in Figure 2, the connection portion of the multiple coils 40 in the slot 18 is provided in a section 80 (hereinafter also referred to as the connection section) that extends over a predetermined length in the axial direction of the slot 18. In the connection section 80, no filler material F, selected from known materials such as insulating paper to enhance the insulation of the multiple coils 40, is filled. On the other hand, such filler material F is filled in at least the portions adjacent to the upstream and downstream sides of the connection section 80. In this way, the flow of liquids such as refrigerant is obstructed between the connection section 80 and the areas outside the connection section 80, allowing the refrigerant to flow selectively into the connection section 80. Furthermore, the flow resistance of the refrigerant in the connection section 80 can be reduced, thereby enhancing the cooling effect.

[0032] In the connection section 80, the connection portions 70 of the multiple coils 40 are arranged so that they do not align radially or circumferentially. Since the connection portions 70 are prone to overheating, avoiding their alignment improves the cooling efficiency by the refrigerant and, consequently, suppresses the temperature rise in the connection section 80. For example, as shown in an enlarged view in Figure 2, the connection portions 70a and 70b of radially adjacent coils 40a and 40b are offset axially. This prevents the connection portions 70a and 70b from aligning radially. Similarly, although not shown in the figure, the connection portions 70a and 70b of circumferentially adjacent coils 40a and 40b are also offset axially so that the connection portions 70a and 70b do not align circumferentially.

[0033] Furthermore, as shown in an enlarged view in Figure 2, the upstream side of coil 40a adjacent to the connection portion 70a of the first segment coil 44a is provided with a narrow diameter portion 50a, which is narrower over a predetermined section than the rest of the axial portion of the first segment coil 44a, for example, in the radial direction. The narrow diameter portion 50a has a smaller rectangular cross-section than the rest of the axial portion. The section in which the narrow diameter portion 50a is formed roughly corresponds to the length of the connection portion 70b of the adjacent other coil 40b. Similarly, the downstream side of coil 40b adjacent to the connection portion 70b of the second segment coil 45b is provided with a narrow diameter portion 50b, which is narrower over a predetermined section than the rest of the axial portion of the second segment coil 45b, for example, in the radial direction. The section in which the narrow diameter portion 50b is formed roughly corresponds to the length of the connection portion 70a of the adjacent other coil 40a. In this way, the flow resistance of the refrigerant in the connection section 80 can be reduced, thereby improving the cooling effect.

[0034] Furthermore, as shown in Figure 3, in the connection section 80, the wall portion 17a of the teeth 16 that defines the slot 18 and faces the coil 40 may be formed to be at least partially thinner so as to be further apart from the coil 40 than in other sections of the slot 18 where the connection section 80 is not defined. By creating this gap, the flow resistance of the refrigerant in the connection section 80 can be reduced, thereby enhancing the cooling effect. In addition, the wall portion 17b of the radially inner end of the teeth 16 that faces the coil 40 may also be formed to be thin so as to be further apart from the coil 40. By creating this gap, the flow resistance of the refrigerant can be reduced, thereby enhancing the cooling effect.

[0035] Such a stator core 12 is, for example, a laminated steel sheet formed by stacking multiple electromagnetic steel sheets in the thickness direction. Alternatively, it may be, for example, a compacted magnetic core formed by press-forming 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 Figure 2, the refrigerant flow path 20 includes a first flow path 22 that extends axially from an inlet 20a in the central circumferential portion of the teeth 16 to a position corresponding to the upstream end of the connection section 80. The refrigerant flow path 20 also includes a second flow path 23 that extends axially to a position corresponding to the downstream end of the connection section 80 and reaches an outlet 20b. The inlet 20a, the first flow path 22, the second flow path 23, and the outlet 20b are all on the same axis along the axial direction. 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 herein.

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

[0038] Furthermore, as shown in Figures 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 reaches the second flow path 23 generally along the circumferential direction. The second connecting flow path 25 causes 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 a second connecting refrigerant flow path disclosed herein.

[0039] Furthermore, as shown in Figures 2 and 3, the refrigerant flow path 20 does not have a refrigerant flow path along the axial direction in the section of the stator core 12 corresponding to the connection section 80. Therefore, all of the refrigerant passing through the first flow path 22 is supplied to the connection section 80 and then flows out through the second flow path 23.

[0040] Next, the cooling effect on the stator 10 and coil 40 in this stator 10 will be explained. As shown in Figure 2, when the coolant 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. This cools the stator core 12 and coil 40. 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 located. This effectively cools the connection portion which is prone to temperature rise, 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 flow of the refrigerant can be improved and the connection section 70 can be effectively cooled.

[0042] In the connection section 80, the connection portions 70 of adjacent coils 40 are arranged so that they are not adjacent in the circumferential and radial directions, thereby improving the flow of refrigerant and the cooling effect. Furthermore, since the connection portion 70 of one adjacent coil 40 is adjacent to the narrow-diameter portion 50 of the other coil 40, the flow of refrigerant is improved and the connection portion 70 can be effectively cooled.

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

[0044] As shown in Figure 4, the stator core 112 of this embodiment has the same configuration as the first embodiment, except that it includes a refrigerant flow path 120 with a different flow path configuration than the refrigerant flow path 20 of the first embodiment.

[0045] The refrigerant flow path 120 includes a first flow path 122 in the circumferential central portion of the teeth 16, communicating from an inlet 20a to an outlet 20b. 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 in the axial central portion of the stator core 12 toward the upstream end (an example of a first intermediate position disclosed herein) of a connection section 80 in a slot 18 circumferentially adjacent to the first flow path 122 (corresponding to the right side in Figure 4). The first connecting flow path 124 supplies solvent from the first flow path 122 to the connection section 80. The first flow path 122 is an example of an axial refrigerant flow path disclosed herein, and the first connecting flow path 124 is an example of a first connecting refrigerant flow path disclosed herein.

[0046] Furthermore, 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 toward the downstream end of the connection section 80 from the position of the first flow path 122 corresponding to the downstream end of the connection section 80 (an example of a second intermediate position disclosed herein). 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 a second connecting refrigerant flow path disclosed herein.

[0047] According to the second embodiment, when 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, the stator core 12 and the coil 40 are cooled, similar to the first embodiment. Also, similar to the first embodiment, the connection portion 70 of the segment coil, which is prone to temperature rise, 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 the entire axial length of the stator core 12 along the axial direction, the refrigerant flow path configuration is simplified, and a highly effective refrigerant that has not passed through the connection section 80 can be supplied downstream of the connection section 80.

[0048] (Third embodiment) Figures 5 and 6 relate to the third embodiment. Figure 5 shows the cross-sectional structure of the stator core 112 of the third embodiment, along the line II-II in Figure 1, and Figures 6(a) to (c) show the cross-sectional sections along lines AA, BB, and CC in Figure 5, respectively. Hereafter, 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 this embodiment has the same configuration as the first embodiment, except that it has a refrigerant flow path 220 with a different flow path configuration than the refrigerant flow path 20 of the first embodiment, and the tooth width defining the connection section 80 of the slot 18 is narrower.

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

[0051] As shown in Figures 5 and 6(a) to 6(b), the first connecting channel 224 extends generally along the circumferential direction toward the upstream ends of the connection sections 80 in both slots 18 adjacent to the first channel 222 in the circumferential direction (left and right sides in Figure 6) in the axial central portion of the stator core 12. The first connecting channel 224 supplies refrigerant to these connection sections 80. The first channel 222 is an example of an axial refrigerant channel disclosed herein, and the first connecting channel is an example of a connecting refrigerant channel disclosed herein.

[0052] As shown in Figure 6(c), in these connection sections 80, the width of the teeth 16 is formed to be narrower than 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 wider. In addition, as the width of the teeth 16 is narrower, the width between opposing teeth 16 on the radially inward side of the slot 18 (the opening width of the slot 18) is increased.

[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. This cools the stator core 12. The refrigerant is also supplied to the connection section 80 via the first connecting flow path 224 and flows radially inward. This effectively cools the connection portion 70 of the segment coil, which is prone to temperature rise, and as a result, effectively cools the coil 40.

[0054] According to the third embodiment, since the refrigerant flow path 220 is provided to penetrate the entire axial length of the stator core 12 along the axial direction, the refrigerant flow path configuration is simplified, and a highly effective refrigerant that has not passed through the connection section 80 can be supplied downstream of the connection section 80. Furthermore, according to the third embodiment, since only the first connecting flow path 224 is provided, the flow path configuration can be simplified. Moreover, according to the third embodiment, since the width of the teeth 16 is formed to be narrow, the width of the slot 18 and the radially inward opening width of the slot 18 are increased as a result, thereby improving the flowability of the refrigerant supplied to the connection section 80 toward the inner diameter of the slot 18, and thus enhancing the cooling effect.

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

[0056] Furthermore, in the above embodiment, one connection section 80 is provided in the slot 18, but depending on how the coil 40 is divided into segment coils, multiple connection sections 80 may be provided as appropriate.

[0057] Furthermore, in the above embodiments, the first segment coil 44 and the second segment coil 45 are provided with a narrow diameter portion 50 adjacent to the connection portion of the other adjacent segment coils, but they do not necessarily have to be provided with a narrow diameter portion 50. Also, the connection portions 70 of adjacent coils 40 are arranged so as not to overlap in the circumferential and / or radial directions, but this is not limited to this, and depending on the flowability of the refrigerant in the connection section 80, they may overlap in at least a part.

[0058] Furthermore, in the first and second embodiments, the width of the teeth 16 may be narrowed, and the width of the slot 18 and the radially inward opening width of the slot 18 may be widened. However, these can be modified as appropriate in view of the refrigerant flow and cooling performance.

[0059] The specific examples of the technology disclosed in this specification have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples described above. The technical elements described in this specification or in the drawings exhibit technical usefulness individually 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 in the drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of symbols]

[0060] 10 Stator, 12, 112, 212 Stator core, 20a Inlet, 20b Outlet, 14 Core back, 16 Teeth, 18 Slot, 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 Wire, 43 Coil coating 44 First segment coil, 45 Second segment coil, 48, 49 Tip section, 50 Thin diameter section, 60 Connecting member, 62, 64 Recess, 66 Conductor section, 70 Connection section, 80 Connection section

Claims

1. A stator core having slots extending in the axial direction, The stator core comprises at least one first segment coil extending in one direction within a slot, The stator core comprises at least one second segment coil extending in the other direction within the slot, Within the slot of the stator core, at least one connecting member connects the tip of at least one first segment coil to the tip of at least one second segment coil, A refrigerant flow path passing through the inside of the stator core, Equipped with, The refrigerant flow path is connected to a portion of the slot, specifically to the portion where the at least one connecting member is located. The refrigerant flow path is A first axial refrigerant flow path extends from one end of the stator core along the axial direction, A second axial refrigerant flow path extends from the other end of the stator core along the axial direction, A first connecting refrigerant flow path extending from the first axial refrigerant flow path to the section of the slot, A second connecting refrigerant flow path extending from the second axial refrigerant flow path to the section of the slot, stata.

2. A stator core having slots extending in the axial direction, The stator core comprises at least one first segment coil extending in one direction within a slot, The stator core comprises at least one second segment coil extending in the other direction within the slot, Within the slot of the stator core, at least one connecting member connects the tip of at least one first segment coil to the tip of at least one second segment coil, A refrigerant flow path passing through the inside of the stator core, Equipped with, The refrigerant flow path is connected to a portion of the slot, specifically to the portion where the at least one connecting member is located. 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 connecting refrigerant flow path extends from a first intermediate position of the axial refrigerant flow path to the section of the slot, A second connecting refrigerant flow path extends from a second intermediate position, which is different from the first intermediate position of the axial refrigerant flow path, to the section of the slot, Having, stata.

3. A stator core having slots extending in the axial direction, The stator core comprises at least one first segment coil extending in one direction within a slot, The stator core comprises at least one second segment coil extending in the other direction within the slot, Within the slot of the stator core, at least one connecting member connects the tip of at least one first segment coil to the tip of at least one second segment coil, A refrigerant flow path passing through the inside of the stator core, Equipped with, The refrigerant flow path is connected to a portion of the slot, specifically to the portion where the at least one connecting member is located. 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 connecting refrigerant flow path extending from an intermediate position in the axial refrigerant flow path to the section of the slot, Having, stata.

4. The stator according to any one of claims 1 to 3, wherein both sides of the aforementioned section in the axial direction are filled with filler material within the slot.

5. The stator according to claim 4, wherein the connecting member is positioned offset in the axial direction of the stator core from the connecting members of other segment coils adjacent to the stator core in the radial or circumferential direction.

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