Rotating electric machine

Abstract

The purpose of the present invention is to provide a rotating electric machine capable of directly cooling a coil that is a heat generating part without using a resin-molded member or the like, and to provide a stator of the rotating electric machine. The rotating electric machine comprises: a stator core 21 having a slot 23; a plurality of coils 25 inserted into the slot 23 and arranged side by side in a radial direction D1 of the stator core 21; and a first insulating member 26 arranged between the coils 25 and an inner surface 23a of the slot 23. The first insulating member 26 includes first insulating member first insulating portions 26c disposed between the coils 25 and the inner surface 23a of the slot 23, and first insulating member second insulating portions 26d disposed between the plurality of coils 25 so as to form a gap 27 between two adjacent coils 25. The gap 27 constitutes a refrigerant flow path through which a refrigerant that cools the coil 25 flows.

Description

Rotating electrical machine

[0005]

[0001] The present invention relates to a rotating electrical machine that cools a coil by flowing a refrigerant around the coil.

[0002] Paragraphs 0040, 0041, 0044 and FIG. 5 of Patent Document 1 describe an insulating member having a first holder portion, a second holder portion, and a passage forming portion. The first holder portion holds an outer diameter side coil bar. The second holder portion holds an inner diameter side coil bar. The passage forming portion is disposed between the first holder portion and the second holder portion, and includes a refrigerant passage having a ceiling surface 56a and a bottom surface 56b inclined with respect to the ceiling surface 56a.

[0003] Japanese Unexamined Patent Application Publication No. 2017-192201

[0004] In Patent Document 1, a resin-molded member (such as a bobbin) is used as the insulating member, and a refrigerant passage having a ceiling surface and a bottom surface is provided in the insulating member to cool the coil. Therefore, a resin-molded member forming the ceiling surface and the bottom surface is interposed between the coil and the refrigerant, and the cooling effect is reduced.

[0005] An object of the present invention is to provide a rotating electrical machine and a stator thereof that can directly cool a coil, which is a heat generating part, without using a resin-molded member or the like.

[0006] In order to achieve the above object, the rotating electrical machine of the present invention includes: a stator core having slots; a plurality of coils inserted into the slots and arranged side by side in the radial direction of the stator core; and a first insulating member disposed between the coil and the inner surface of the slot. The first insulating member includes a first insulating portion of the first insulating member disposed between the coil and the inner surface of the slot, and a second insulating portion of the first insulating member disposed between the plurality of coils so as to form a gap between two adjacent coils. The gap constitutes a refrigerant flow path through which a refrigerant that cools the coil flows.

[0007] According to the present invention, it is possible to provide a rotating electrical machine and a stator thereof that can directly cool a coil, which is a heat generating part, without using a resin-molded member or the like.

[0008] Other issues, configurations, and effects not mentioned above will be clarified by the following description of embodiments for carrying out the invention.

[0009] This is a cross-sectional view showing a rotating electric machine according to one embodiment of the present invention. This is a cross-sectional view showing a cross-section along the axial direction of a stator according to one embodiment of the present invention. This is a plan view showing an enlarged view of the vicinity of one slot in the stator core according to one embodiment of the present invention. This is a perspective view showing the first insulating member of Figure 3 by itself. This is a cross-sectional view taken along line V-V in Figure 3. This is a plan view showing a modified example 1 in which the configuration of the first insulating member of Figure 3 has been changed. This is a plan view showing a modified example 2 in which a second insulating member has been added to Figure 3. This is a perspective view showing the second insulating member of Figure 7 by itself. This is a plan view showing a modified example 3 in which the configuration of the first insulating member of Figure 3 has been changed and a second insulating member has been added. This is a perspective view showing the second insulating member of Figure 9 by itself. This is a plan view showing a modified example 4 in which the configuration of the first insulating member of Figure 3 has been changed and a second insulating member has been added. This is a plan view showing a modified example 5 in which the configuration of the first insulating member of Figure 9 has been changed. This is a perspective view showing the configuration of the first insulating member and the second insulating member according to one embodiment of the present invention. This is a diagram showing a modified example 6 in which the length of the first insulating member of Figure 13 has been changed. This is a diagram showing a modified example 7 in which the configuration of the first insulating member of Figure 14 has been changed.

[0010] In the following explanation, similar components in each figure will be denoted by the same reference numerals to avoid repetition of similar explanations. Furthermore, if there are differences among components denoted by the same reference numerals, those differences will be explained.

[0011] A rotating electric machine 1 according to one embodiment of the present invention will be described using Figures 1 and 2. Figure 1 is a cross-sectional view showing a rotating electric machine 1 according to one embodiment of the present invention. Figure 2 is a cross-sectional view showing a cross-section along the axial direction of a stator according to one embodiment of the present invention. Note that the cross-section shown in Figure 1 is a cross-section perpendicular to the central axis (axis) of the rotating shaft 38. In the following description, the direction along the central axis of the rotating shaft 38 will be referred to as the "axial direction". This "axial direction" coincides with the "axial direction" of the stator core. Furthermore, unless otherwise specified, "circumferential direction" and "radial direction" refer to the "circumferential direction" and "radial direction" of the rotating electric machine (stator core, rotor core).

[0012] As shown in Figure 1, the rotating electric machine 1 has a stator 2 and a rotor 3. In this embodiment, an internal rotation type rotating electric machine 1 is described in which the rotor 3 is arranged on the inner circumference side of the stator 2. The rotating electric machine to which the present invention can be applied is not limited to the internal rotation type rotating electric machine 1, but can also be applied to an external rotation type rotating electric machine.

[0013] The stator 2 has a stator core 21. The stator core 21 has a plurality of teeth 22 arranged at intervals in the circumferential direction, a plurality of slots 23 formed between adjacent teeth 22, and a yoke 24 connecting the plurality of teeth 22. The plurality of slots 23 are arranged on the inner circumference side of the stator core 21, spaced apart in the circumferential direction. The yoke 24 constitutes the outer circumference of the stator core 21, and the teeth 22 are provided to protrude inward from the yoke 24.

[0014] The stator core 21 is housed in a housing (not shown) and supported by the housing. The stator 2 is positioned such that its inner circumferential surface faces the outer circumferential surface of the rotor core 31. A gap G is provided between the inner circumferential surface of the stator core 21 and the outer circumferential surface of the rotor core 31.

[0015] Coils 25 are wound around adjacent slots 23 of the stator core 21. In this embodiment, the coils 25 are composed of segment coils. A portion of the segment coil 25 is inserted into the slots 23, and a portion is positioned outside the slots 23. The portion of the segment coil 25 positioned outside the slots 23 is bent and welded at the axial end of the stator core 21 to form the stator winding. The segment coil 25 will be described simply as a "coil".

[0016] The rotor 3 comprises a rotor core 31, a plurality of magnets (permanent magnets) 32 that constitute the magnetic poles, and a rotating shaft 33. In this embodiment, an example is shown in which one magnetic pole is composed of two magnets 32, but the configuration of the magnets is not limited to the configuration of this embodiment, and other configurations may be adopted.

[0017] As shown in Figure 2, cuffs 24 are positioned at both axial ends of the stator core 21. The portion of the coil 25 positioned outside the slot 23 constitutes the coil end portion 25g. The coil end portion 25g is covered by a coil end cover 29.

[0018] The coil 25 will be described using Figures 3 to 5. Figure 3 is a plan view showing an enlarged view of the vicinity of one slot 23 of the stator core 21 according to one embodiment of the present invention. Figure 4 is a perspective view showing the first insulating member 26 of Figure 3 by itself. Figure 5 is a cross-sectional view taken along line V-V in Figure 3. As shown in Figure 3, a plurality of slots 23 are arranged on the inner circumference side of the stator core 21 so as to be spaced apart in the circumferential direction. Teeth 22 are formed between the plurality of slots 23. A yoke 21a is provided on the outer circumference side of the stator core 21. The teeth 22 are configured to protrude inward from the yoke 21a. The tip surface 22a of the teeth 22 faces the outer circumference surface of the rotor core 31 (see Figure 1) of the rotor 3, with a small gap G (see Figure 1) in between.

[0019] Multiple coils 25 are inserted through slot 23. The multiple coils 25 are arranged in a line along the radial direction D1 of the stator core 21. Figure 3 shows an example in which four coils 25 are arranged in one slot 23, but the number of coils 25 is not limited to four. In addition, the four coils 25 are distinguished by assigning the symbols "25-1" to "25-4" from the innermost diameter side to the outermost diameter side.

[0020] A first insulating member 26 is placed in the slot 23. Multiple coils 25 are inserted inside the first insulating member 26. The first insulating member 26 is positioned to be interposed between the coils 25 and the inner surface 23a of the slot 23. The first insulating member 26 is a sheet-like member and surrounds the four coils 25 arranged radially D1 in the cross-sectional view of Figure 3. In this embodiment, the first insulating member 26, which is made of a single sheet-like member, is positioned to cover the entire inner surface 23a of the slot 23 (circumferential side surface 23aa and radial side surface 23ab).

[0021] Here, when explaining "surfaces," a "circumferential surface (circumferential side surface)" is a surface (side surface) facing the circumferential direction D2, and a "radial surface (radial side surface)" is a surface (side surface) facing the radial direction D1.

[0022] The first insulating member 26 has a foam adhesive 26x between it and the inner surface 23a of the slot 23 and between it and the coil 25. In this case, the first insulating member 26 may be made of foam insulating paper integrated with the foam adhesive 26x. By using foam insulating paper for the first insulating member 26, the coil 25 can be fixed to the inner surface 23a of the slot 23.

[0023] The first insulating member 26 includes a first insulating portion 26c of the first insulating member, which is positioned between the coil 25 and the inner surface 23a of the slot 23, and a second insulating portion 26d of the first insulating member, which is positioned between a plurality of coils so as to form a gap 27 between two adjacent coils 25. This gap 27 constitutes a refrigerant flow path through which a refrigerant that cools the coil 25 flows. Cooling refrigerant (e.g., oil) flows into the slot 23 through the gap 27, and the refrigerant flows through the gap 27 in the axial direction D3 (see Figure 2). In order to improve cooling performance, it is preferable to configure a cooling water flow path in a frame (not shown) provided on the outer diameter side of the stator core 21 through which cooling water flows.

[0024] The first insulating member's first insulating portion 26c is composed of a portion of the first insulating member 26 that covers the circumferential surfaces of the plurality of coils 25-1 to 25-4, the inner diameter side radial surface of coil 25-1, and the outer diameter side radial surface of coil 25-4. The second insulating portion 26d of the first insulating member is composed of a portion of the first insulating member 26 that fits between coils 25-1 and 25-2, between coils 25-2 and 25-3, and between coils 25-3 and 25-4, respectively. The second insulating portion 26d of the first insulating member is placed between the plurality of coils 25, and a predetermined gap 27 is formed between the coils 25. In this case, each coil 25 is placed one by one in the space partitioned by the second insulating portion 26d of the first insulating member.

[0025] In Figure 3, the second insulating portion 26d of the first insulating member is configured in a total of six locations. One of these six locations is configured at both ends 26a and 26b of the first insulating member 26, as shown in Figure 4. In this case, the cut in the first insulating member 26 is positioned between multiple coils 25, thereby improving the reliability of electrical insulation.

[0026] In this embodiment, the second insulating portion 26d of the first insulating member that forms the gap 27 can be composed of one second insulating portion 26d of the first insulating member 26, which is composed of both ends 26a and 26b of the first insulating member 26, and five second insulating portions 26d of the first insulating member 26, which are composed of folded portions 26f of the first insulating member 26. That is, the first insulating member 26 has a folded portion 26f that is folded back between two adjacent coils 25, and its edges 26a and 26b are positioned between the two adjacent coils 25. With this configuration, in this embodiment, the six second insulating portions 26d of the first insulating member are composed of a single sheet-like member. This improves productivity in forming the gap 27 and assembling the coils 25. The gap 27 becomes a refrigerant flow path. For this reason, reference numeral 27 is also used for the refrigerant flow path.

[0027] As shown in Figure 5, in this embodiment, the axial length L26 of the first insulating member 26 is longer than the axial length L23 of the slot 23, and in the axial direction D3, the first insulating member 26 is provided in a range that covers the entire axial length of the slot 23.

[0028] In this example, a single first insulating member 26 is used to form multiple second insulating portions 26d of the first insulating member.

[0029] Using Figure 6, we will explain the first modification example of the first insulating member 26. Figure 6 is a plan view showing the first modification example 1, in which the configuration of the first insulating member 26 in Figure 3 has been changed. In Figure 3, an example was shown in which one first insulating member 26 is provided for multiple coils 25 arranged in one slot 23, but multiple first insulating members 26 may be provided. In this example, the four coils 25-1 to 25-4 are divided into two groups, with coils 25-1 and 25-2 treated as one group and provided with the first insulating member 26A, and coils 25-3 and 25-4 treated as one group and provided with the first insulating member 26B.

[0030] In this example, the coil group 25-3, 25-4 is composed of five first insulating member first insulating portions 26c and two first insulating member second insulating portions 26d. Of the two first insulating member second insulating portions 26d, one set of two first insulating member second insulating portions 26d is composed of both ends 26a, 26b of the first insulating member 26B, and the other first insulating member second insulating portion 26d is composed of the folded portion 26f of the first insulating member 26B. The same applies to the coil group 25-1, 25-2.

[0031] In this example, the cooling performance may be reduced compared to the above-described embodiment because a gap 27 constituting a refrigerant flow path is not formed between coils 25-3 and 25-4. However, if sufficient cooling performance can be obtained, the fixing strength of coil 25 can be increased by using a configuration like this example.

[0032] In this example, a single first insulating member 26 is used to form multiple second insulating portions 26d of the first insulating member, and multiple first insulating members 26 are also used.

[0033] Using Figures 7 and 8, a modified example 2 in which the configuration of the insulating member has been changed will be explained. Figure 7 is a plan view showing modified example 2 in which a second insulating member has been added to Figure 3. Figure 8 is a perspective view showing the second insulating member 28 of Figure 7 by itself. In this example, the configuration differs from that of Figure 3 in that a second insulating member 28 is provided between the first insulating member 26 and the inner surface 23a of the slot 23, and the first insulating member 26 and the second insulating member 28 are arranged in a double layer as insulating members between the coil 25 and the inner surface 23a of the slot 23. The other configurations are the same as those of Figure 3.

[0034] In this example, it is possible to improve insulation performance while preventing refrigerant leakage at the axial end of the stator core 21. As a result, it becomes easier to ensure a good seal between the stator core 21 and other components, such as the cuff 24 (see Figure 2), at the axial end of the stator core 21.

[0035] Specifically, by arranging the first insulating member 26 and the second insulating member 28 in a double layer, the thickness of the insulating members is increased, improving the insulating performance. Since the first insulating member 26 has a first insulating portion 26c and a second insulating portion 26d, the same configuration and effects as in Figure 3 can be obtained, and a refrigerant flow path 27 can be constructed.

[0036] When a cuff 24 (see Figure 2) for forming a refrigerant flow path and a coil end cover 29 (see Figure 2) are arranged at the axial end of the stator core 21, constructing the second insulating member 28 from foamed insulating paper makes it easier to ensure a good seal because the second insulating member 28 will be in close contact with the cuff.

[0037] As shown in Figure 8, the second insulating member 28 is inserted into the slot 23 such that its cross-section, viewed from the axial direction D3, is rectangular, and is positioned to surround the multiple coils 25 inserted into the slot 23. In this case, both ends 28a and 28b of the second insulating member 28 overlap. However, the shape of the second insulating member 28 is not limited to the shape shown in Figure 8.

[0038] The first insulating member 26 and the second insulating member 28 only need to ensure insulation between the coil 25 and the slot 23. For this reason, the first insulating member 26 and the second insulating member 28 can have the shapes shown in Figures 9 and 10. Figure 9 is a plan view showing modified example 3, in which the configuration of the first insulating member 26 in Figure 3 is changed and a second insulating member 28 is added. Figure 10 is a perspective view showing the second insulating member 28 in Figure 9 by itself.

[0039] In this example, on a partial side surface of a plurality of coils 25, an insulating member becomes either the first insulating member 26 or the second insulating member 28, and there is a portion where the insulating member is not arranged in a double layer. However, the portion that cannot be covered by the first insulating member 26 is covered by the second insulating member 28, and the portion that cannot be covered by the second insulating member 28 is covered by the first insulating member 26, so that insulation can be performed by either the first insulating member 26 or the second insulating member 28. When sufficient insulation performance can be obtained by insulation with either the first insulating member 26 or the second insulating member 28, the first insulating member 26 and the second insulating member may have the shapes shown in FIGS. 9 and 10.

[0040] In this example, the first insulating member 26 covers a part of the radial plane of the coil 25 and is arranged such that a part (the other part) of the radial plane is exposed from the first insulating member 26.

[0041] In the above-described embodiments and modified examples, the gaps (refrigerant flow paths) 27 are formed by overlapping both end portions 26a and 26b of the first insulating member 26 or by folding back and overlapping the first insulating member 26. However, the gaps (refrigerant flow paths) 27 can also be formed by arranging either one of the end portions of the first insulating member 26 on a part of the radial plane of the coil 25.

[0042] In this case, since the gap 27 is formed with the thickness of one sheet of the first insulating member 26, the cross-sectional area of the gap 27 becomes small; however, the configuration of the first insulating member 26 can be simplified and the amount of its use can also be reduced.

[0043] Note that this example is an example in which a plurality of first insulating member second insulating parts 26d are formed by one sheet of the first insulating member 26.

[0044] It is also possible to configure one first insulating member second insulating part 26d with one sheet of the first insulating member 26 and to use a configuration in which a plurality of first insulating members are used; FIG. 11 shows this configuration. FIG. 11 is a plan view showing a modified example 4 in which the configuration of the first insulating member 26 in FIG. 3 is changed and the second insulating member 28 is added.

[0045] In FIG. 11, even-numbered (six in this example) coils 25 are used, with two coils 25 forming one group, thus constituting three groups. In this case, one first insulating member 26 is used for one group, and one first insulating member second insulating portion 26d is formed for one first insulating member 26. The configuration of the first insulating member second insulating portion 26d itself is the same as the configuration in FIG. 9. Also, the second insulating member 28 is substantially the same as in FIG. 7, but the position where both end portions 281 and 282 are overlapped is different from that in FIG. 7.

[0046] It is also possible to change the first insulating member 26 in FIG. 9 and configure it as shown in FIG. 12. FIG. 12 is a plan view showing a modification example 5 in which the configuration of the first insulating member 26 in FIG. 9 is changed. Also in this example, similar to FIG. 9, the first insulating member 26 covers a part of the radial plane of the coil 25 and is arranged such that another part of the radial plane is exposed from this first insulating member 26. Also in this example, a gap 27 is formed between the plurality of coils 25. Further, in this example, a gap 27 is also formed between the coil 25 and the second insulating member 28.

[0047] When foamed insulating paper is used for the second insulating member 28, the surface of the second insulating member 28 foams and the thickness of the second insulating member 28 increases. However, since the thickness of the first insulating member 26 remains, a gap 27 is formed between the coil 25 and the second insulating member 28 before foaming.

[0048] The positional relationship between the axial end portion 261 of the first insulating member 26 and the axial end portion 281 of the second insulating member 28 will be described using FIG. 13. FIG. 13 is a perspective view showing the configuration of the first insulating member 26 and the second insulating member 28 according to an embodiment of the present invention. The first insulating member 26 is arranged such that the position (axial end portion position) of at least one of the both end portions (axial end portions) in the axial direction of the stator core 21 is the same as the axial end portion position of the second insulating member 28.

[0049] From the viewpoint of insulation, the axial end portion 281 of the second insulating member 28 is arranged at a position protruding from the slot of the stator core 21. Therefore, by configuring as described above, the axial end portion 261 of the first insulating member 26 will be arranged at a position protruding from the slot of the stator core 21.

[0050] This makes it possible to visualize the displacement of the foamed insulating paper when inserting the coil 25 into the slot 23. Specifically, the axial end positions of the first insulating member 26 and the second insulating member 28 are set to protrude a few millimeters axially from the end of the stator core 21. If a cuff 24 is provided, the cuff is set to protrude a few millimeters axially from the end of the cuff 24. This allows for visual confirmation of the axial ends of the first insulating member 26 and the second insulating member 28. If the axial end positions of the first insulating member 26 and the second insulating member 28 are displaced from their predetermined positions due to the insertion of the coil 25 into the slot 23 or the installation of other parts, visual confirmation becomes possible, allowing for correction or removal, thereby preventing defects related to insulation performance.

[0051] Using Figure 14, we will explain a modification example 6 in which the length L26 of the first insulating member 26 is changed. Figure 14 is a diagram showing a modification example 6 in which the length of the first insulating member 26 of Figure 13 is changed. In this example, the axial length L26 of the first insulating member 26, which is the length in the axial direction D3 of the stator core 21, is shorter than the axial length L28 of the second insulating member 28.

[0052] The gap 27 between the coils can be enlarged, increasing the cooling area of ​​the coils 25 and improving cooling performance. Specifically, by setting the axial length L26 of the first insulating member 26 and the axial length L28 of the second insulating member 28 to L26 < L28, a region 271 is formed between two adjacent coils 25 where the first insulating member 26 is not placed. With the first insulating member 26 removed, the area through which the refrigerant passes increases, and the area in direct contact between the refrigerant and the coils 25 increases. This increases the cooling effect.

[0053] Using Figure 15, we will explain Modification Example 7, in which the configuration of Figure 14 has been changed. Figure 15 is a diagram showing Modification Example 7, in which the configuration of the first insulating member of Figure 14 has been changed. In this example, the first insulating member 26 is arranged at both ends of the stator core 21 in the axial direction D3. In this example, two first insulating members 26 are arranged at both ends of the stator core 21, spaced apart in the axial direction D3.

[0054] This makes it easier to position the coil 25, prevents the coil 25 from tilting, and improves the moldability of the coil end 25g. Specifically, by making the axial length L26 of the first insulating member 26 shorter than the axial length L28 of the second insulating member 28, it becomes possible to place the first insulating member 26 at both axial ends of the stator core 21. In the region 271 where the first insulating member 26 is not present, the area through which the refrigerant passes increases, increasing the area in direct contact between the refrigerant and the coil 25, and thus increasing the cooling effect of the coil. In this case, by placing the first insulating member 26 at both axial ends of the stator core 21, the coil 25 can be fixed in a more stable state than a cantilevered state, preventing the coil 25 from tilting and improving the moldability of the coil end 25g.

[0055] The rotating electric machine 1 of the above-described embodiment and modification has the following features: (1) It comprises a stator core 21 having slots 23, a plurality of coils 25 inserted through the slots 23 and arranged in the radial direction D1 of the stator core 21, and a first insulating member 26 disposed between the coils 25 and the inner surface 23a of the slots 23, wherein the first insulating member 26 includes a first insulating portion 26c of the first insulating member disposed between the coils 25 and the inner surface 23a of the slots 23, and a second insulating portion 26d of the first insulating member disposed between the plurality of coils 25 so as to form a gap 27 between two adjacent coils 25, and the gap 27 constitutes a refrigerant flow path through which a refrigerant that cools the coils 25 flows.

[0056] (2) The first insulating member 26 has a foam adhesive 26x between it and the inner surface 23a of the slot 23 and between it and the coil 25.

[0057] (3) The first insulating member 26 is made of foamed insulating paper integrated with foamed adhesive 26x.

[0058] (4) The coil 25 is further provided with a second insulating member 28 positioned between the first insulating member 26 and the inner surface 23a of the slot 23, with the first insulating member 26 and the second insulating member 28 being double-layered as insulating members between the coil 25 and the inner surface 23a of the slot 23.

[0059] (5) The first insulating member 26 is positioned so that it covers a portion of the radial surface of the coil 25, and the other portion of the radial surface is exposed from the first insulating member 26.

[0060] (6) The first insulating member 26 is positioned such that the axial end position of at least one of the ends of the stator core 21 in the axial direction D3 is the same as the axial end position of the second insulating member 28.

[0061] (7) The axial length L26 of the first insulating member 26, which is the length in the axial direction D3 of the stator core 21, is shorter than the axial length L28 of the second insulating member 28.

[0062] (8) The first insulating members 26 are arranged at both ends of the stator core 21 in the axial direction D3.

[0063] (9) The first insulating member 26 has a folded portion 26f that is folded back between two adjacent coils 25.

[0064] (10) The first insulating member 26 is positioned between two adjacent coils 25, with edges 26a and 26b.

[0065] It should be noted that the present invention is not limited to the embodiments and modifications described above, and includes various modifications. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all of the above configurations. Furthermore, it is possible to add, delete, or replace some of the configurations in the embodiments and modifications with other configurations.

[0066] 1...rotating electric machine, 21...stator core, 23...slot, 23a...inner surface of slot 23, 25...coil, 26...first insulating member, 26a, 26b...edge of first insulating member 26, 26c...first insulating part of first insulating member, 26d...second insulating part of first insulating member, 26f...folded part, 26x...foamed adhesive, 27...gap (refrigerant flow path), 28...second insulating member, D1...radial direction, D3...axial direction, L26...axial length of first insulating member 26, L28...axial length of second insulating member 28.

Claims

1. A rotating electric machine comprising: a stator core having slots; a plurality of coils inserted through the slots and arranged radially in line with the stator core; and a first insulating member disposed between the coils and the inner surface of the slots, wherein the first insulating member includes a first insulating portion of the first insulating member disposed between the coils and the inner surface of the slots, and a second insulating portion of the first insulating member disposed between the plurality of coils so as to form a gap between two adjacent coils, the gaps constituting a refrigerant flow path through which a refrigerant for cooling the coils flows.

2. The rotating electric machine according to claim 1, wherein the first insulating member has a foamed adhesive between it and the inner surface of the slot and between it and the coil.

3. The rotating electric machine according to claim 2, wherein the first insulating member is made of foamed insulating paper integrated with the foamed adhesive.

4. A rotating electric machine according to claim 1, further comprising a second insulating member disposed between the first insulating member and the inner surface of the slot, wherein the first insulating member and the second insulating member are double-layered as insulating members between the coil and the inner surface of the slot.

5. A rotating electric machine according to claim 1, wherein the first insulating member is arranged to cover a portion of the radial surface of the coil, and the other portion of the radial surface is exposed from the first insulating member.

6. The rotating electric machine according to claim 4, wherein the first insulating member is arranged such that the axial end position of at least one of the two ends of the stator core in the axial direction is the same as the axial end position of the second insulating member.

7. A rotating electric machine according to claim 4, wherein the axial length of the first insulating member, which is the length in the axial direction of the stator core, is shorter than the axial length of the second insulating member.

8. The rotating electric machine according to claim 7, wherein the first insulating member is disposed at both ends of the stator core in the axial direction.

9. The rotating electric machine according to claim 1, wherein the first insulating member has a folded portion that is folded back between two adjacent coils.

10. The rotating electric machine according to claim 1, wherein the first insulating member is positioned between two coils whose edges are adjacent.

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