Rotary electric machine and stator thereof

Abstract

The purpose of the present invention is to suppress breakage of a bobbin due to the influence of coil bending. A stator of a rotary electric machine according to the present invention comprises a stator core in which slots are formed, a segment coil that is inserted into the slots, and a resin bobbin 3 that is disposed between the stator core and the segment coil. The resin bobbin 3 comprises a slot insertion portion 31 that is positioned inside the slot, and separation portions 33 for separating adjacent segment coils in the radial direction of the stator core on the inside of the slot insertion portion 31. On the side of one axial-direction end surface of the stator core, the separation portions 33 are formed at positions that are separated inwardly in the axial direction from one end surface of the stator core by a prescribed distance La (La>0).

Description

Rotating electric machine and its stator

[0001] The present invention relates to a rotating electric machine and a stator thereof.

[0002] Patent Document 1 describes an insulation assembly (10) used in a stator assembly (26) for an electric motor (27) (paragraph 0014). The stator assembly (26) includes a stator tack (30), and the insulation assembly (10) is attached to one or both of the twist side (28) and crown side of the stator tack (30) (paragraph 0014 and Figure 3). The stator tack (30) for the stator assembly (26) defines a plurality of stator slots (32) that completely penetrate the stator tack (30) (paragraph 0014 and Figure 3). The insulation assembly (10) electrically insulates conductors (34) from each other and from the ends of the stator tack (30) (paragraph 0015). The insulation assembly (10) includes a generally annular body (12) surrounding a central opening (14) and at least two spaced apart fingers (20) extending from the body (12) and projecting radially inward toward the central opening (14). The spaced apart fingers (20) define gaps (22) between them, and a slot liner (24) is inserted to fit into each gap (22). The slot liner (24) engages with the fingers (20) to provide an insulation system for the stator assembly (26).

[0003] Furthermore, paragraph 0025 and Figure 5 of Patent Document 1 describe a slot liner (24) having a plurality of cavities (36). In this case, the slot liner (24) has a pair of opposing side walls (70), a pair of opposing end walls (72), and at least one partition wall (74) that divides a cavity surrounded by the pair of side walls (70) and the pair of end walls (72) into a plurality of cavities (36).

[0004] The reference numerals in parentheses used in the above description are those used in Patent Document 1 and are unrelated to the reference numerals used in this specification.

[0005] US Patent Application Publication No. 2012 / 0194028

[0006] The bobbin on which the coil is wound needs to be formed as thin as possible to increase the coil space factor. However, if a resin bobbin (resin bobbin) is formed too thin, it may be damaged during the bending process of forming the coil. For example, like the partition wall of the slot liner in Patent Document 1, if a partition wall is provided to divide the internal cavity of the slot liner in the radial direction of the stator (hereinafter simply referred to as the radial direction), and the end of the partition wall in the axial direction of the stator (hereinafter simply referred to as the axial direction) is located near the end of the slot liner in the axial direction on the twist side of the stator stack, stress may be applied to the axial end of the partition wall when the conductor is bent in the radial direction, which may cause damage to the slot liner.

[0007] Hereinafter, in this specification, the configuration corresponding to the slot liner and conductor of Patent Document 1 will be referred to as a bobbin and coil.

[0008] An object of the present invention is to suppress damage to the bobbin due to the influence of coil bending.

[0009] In order to achieve the above-mentioned object, the stator of the rotating electric machine of the present invention is a stator of a rotating electric machine comprising: a stator core in which slots are formed; segment coils inserted into the slots; and a resin bobbin arranged between the stator core and the segment coils, wherein the resin bobbin comprises a slot insertion portion located inside the slots; and a separation portion that separates adjacent segment coils in the radial direction of the stator core inside the slot insertion portion, and the separation portion is formed on the side of one axial end face of the stator core, at a position a predetermined distance axially inward from the one end face of the stator core.

[0010] According to the present invention, it is possible to provide a rotating electric machine that can suppress damage to the bobbin due to the influence of coil bending and that is easy to assemble. Objects, configurations, and effects other than those described above will become apparent from the following description of the preferred embodiment of the present invention.

[0011] FIG. 1 is a perspective view showing a portion of a stator used in an embodiment of a rotating electric machine according to the present invention. FIG. 2 is a perspective view showing a state in which a resin bobbin according to the present invention is assembled to a stator core. FIG. 3 is a perspective view showing an embodiment of a resin bobbin according to the present invention. FIG. 4 is a perspective view showing the resin bobbin of FIG. 3 cut along the radial direction of the stator core. FIG. 5 is an explanatory view illustrating the bending process of segment coils. FIG. 6 is a perspective view showing a first modified example of a resin bobbin according to the present invention. FIG. 7 is a perspective view showing a second modified example of a resin bobbin according to the present invention. FIG. 8 is a perspective view showing a third modified example of a resin bobbin according to the present invention. FIG. 9 is a perspective view showing a fourth modified example of a resin bobbin according to the present invention.

[0012] In the following description, the same reference numerals will be used to designate the same components in each drawing to avoid duplication of explanation. In addition, when there are differences between components with the same reference numerals, the differences will be explained.

[0013] [Embodiment 1] A rotating electric machine 1 according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a perspective view showing a part of a stator 2 used in one embodiment of the rotating electric machine 1 according to the present invention. Fig. 1 shows a part of the stator 2 of the rotating electric machine 1, and the stator 2 is arranged on the outer periphery of a rotor (not shown). Reference numeral 1a denotes the central axis (shaft center) of a rotating shaft (not shown).

[0014] In the following description, the direction along the central axis 1a of the rotating shaft will be referred to as the "axial direction." Furthermore, the terms "circumferential direction" and "radial direction" refer to the "circumferential direction" and "radial direction" of the rotating electric machine (stator core, rotor core) unless otherwise specified.

[0015] The stator 2 has a stator core 21 in which slots 211 (see FIG. 2) are formed. The stator core 21 is accommodated in and supported by a housing (not shown). The outer peripheral surface of the stator core 21 is covered by a housing 23. The stator 2 is arranged so that the inner peripheral surface of the stator core 21 faces the outer peripheral surface of the rotor core (not shown), but the stator 2 may also be configured so that the outer peripheral surface of the stator core 21 faces the inner peripheral surface of the rotor core.

[0016] Coils 22 are wound around the slots 211 of the stator core 21. In this embodiment, the coils 22 are composed of segment coils inserted into the slots 211. In this embodiment, the segment coils 22 are composed of flat wire with a rectangular cross section. The coils 22 are formed by bending segment coils composed of flat wire while they are assembled to the stator core 21, and then connecting multiple segment coils by welding or the like. The portion of the segment coil 22 that is bent and connected is located at a coil end portion 22a on one end of the stator core 21 in the axial direction. The coil end portion 22a where the bending and connection are performed is called the first coil end portion, and the coil end portion 22b on the opposite side is called the second coil end portion. The segment coil 22 is assembled to the stator core 21 with a bent portion that is pre-formed into a mountain shape on the second coil end portion 22b side.

[0017] The coil 22 is not limited to a rectangular wire, but may be made of a wire having a round cross section.

[0018] The stator core 21 will be described with reference to Fig. 2. Fig. 2 is a perspective view showing a state in which the resin bobbin 3 according to the present invention is assembled to the stator core 21.

[0019] The stator core 21 constitutes the stator 2 of the rotating electrical machine 1, and is formed with a plurality of slots 211 for inserting coils. The plurality of slots 211 are spaced apart in the circumferential direction of the stator core 21, and teeth 212 are formed between the plurality of slots 211 so as to protrude from the outer periphery to the inner periphery of the stator core 21. Tip surfaces 212a of the teeth 212 face the outer periphery of the rotor (rotor core), not shown, across a small gap.

[0020] A resin bobbin (resin bobbin) 3 is inserted into the slot 211 from the axial end of the stator core 21. The resin bobbin 3 is disposed between the stator core 21 and the segment coil 22, and is interposed between the stator core 21 and the segment coil 22.

[0021] The resin bobbin 3 will be described with reference to Fig. 3. Fig. 3 is a perspective view showing an embodiment of the resin bobbin according to the present invention.

[0022] The resin bobbin 3 has a slot insertion portion (frame portion) 31 that is inserted inside the slot 211, and a separation portion 33 that separates adjacent segment coils 22 (see FIG. 1) in the radial direction of the stator core 21 inside the slot insertion portion 31. The resin bobbin 3 further has a flange portion 32 that is provided at an axial end portion 31a of the slot insertion portion 31 and is integrated with the slot insertion portion 31. The axial end portion 31a of the slot insertion portion 31 is the end portion located on the coil end portion 22a side. The resin bobbin 3 can be made using, for example, engineering plastic such as PPS resin or LCP resin.

[0023] Since the resin bobbin 3 has the flange portion 32 integrated with the slot insertion portion 31, when the resin bobbin 3 is inserted into the slot 211, the flange 32 at the axial end portion 3a of the resin bobbin 3 serves as a stopper, preventing the resin bobbin 3 from being inserted further into the slot 211. This makes it possible to position the resin bobbin 3 in the axial direction.

[0024] The slot insertion portion 31 constitutes the frame portion of the resin bobbin 3. The slot insertion portion 31 has two side wall portions 311, 312 that extend along the radial direction of the stator core 21, and two side wall portions 313, 314 that extend along the circumferential direction of the stator core 21. The slot insertion portion 31 is inserted inside the slot 211, and the side wall portions 311 to 314 come into contact with the inner surface of the slot 211 (the side surfaces of the teeth 212). A space (resin bobbin internal space) 315 surrounded by the side wall portions 311 to 314 is formed inside the slot insertion portion 31, and multiple segment coils 22 are inserted into the space 315.

[0025] The flange portion 32 is formed so as to protrude in a direction perpendicular to the axial direction from the axial end of the slot insertion portion 31. The flange portion 32 has an opening 321 that communicates with the space 315, and the segment coil 22 is drawn out from the opening 321. The flange portion 32 protrudes from the end face 21 a of the stator core 21 (see FIG. 2 ) and constitutes a coil guide portion that guides the coil (segment coil) 22.

[0026] The flange portion 32 has an inclined portion 322 at the opening 321. The inclined portion 322 is formed so that the area of ​​the opening 321 increases from the inside (the slot insertion portion 31 side) of the slot 211 toward the outside (the side opposite to the slot insertion portion 31) in the axial direction of the stator core 21. The inclined portion 322 may be formed in a flat shape or a curved shape. The inclined portion 322 is formed around the entire periphery of the opening 321.

[0027] When bending the segment coil 22, stress is applied to the end of the resin bobbin 3. By providing the inclined portion 322, the stress applied to the resin bobbin 3 and the segment coil 22 during bending of the segment coil 22 can be reduced, preventing damage to the resin bobbin 3 and the segment coil 22. Furthermore, by processing the inclined portion 322 into a shape that follows the bending direction of the segment coil 22, it can also be used as a bending jig for the segment coil 22. Forming the inclined portion 322 into a curved shape is more effective at preventing damage to the resin bobbin 3 and the segment coil 22 than forming it into a flat shape.

[0028] The separator 33 supports the segment coils 22 so as to separate adjacent segment coils 22 in the radial direction of the stator core 21. For this reason, the separator 33 may be referred to as a coil support portion or simply as a support portion. In this embodiment, the separator 33 extends along the circumferential direction and is connected to the two side wall portions 311, 312 of the slot insertion portion 31. In this case, on a cross section perpendicular to the axial direction of the stator core 21, the separator 33 is arranged to divide the space 315 into multiple spaces, and forms a partition portion.

[0029] The resin bobbin 3 will be described in detail with reference to Fig. 4. Fig. 4 is a perspective view showing the resin bobbin 3 of Fig. 3 cut along the radial direction of the stator core 21.

[0030] The separation portion 33 is formed at one axial end of the stator core 21, at a position a predetermined distance La axially inward from the end face 21a (see FIG. 2) of the stator core 21. Also, at one axial end of the stator core 21, the axial end 331 of the separation portion 33 is located at a position a predetermined distance La axially inward from the axial end 31a of the slot insertion portion 31. Note that the one end in this case is the side where the segment coil 22 is bent and connected, and where the first coil end portion 22a is provided.

[0031] The distance La is greater than 0 (La > 0). That is, at least on one axial end side of the stator core 21, an axial distance La (La > 0) is provided between the axial end of the separation portion 33 located on this end side and the end face 21 a of the stator core 21. In this case, the axial length L33 of the separation portion 33 is shorter than the axial length L3 of the resin bobbin 3 (L33 < L3) and shorter than the axial length L31 of the slot insertion portion 31 (L33 < L31).

[0032] In this embodiment, the separation portion 33 is formed at the other axial end of the stator core 21, at a position axially inwardly spaced a predetermined distance Lb (Lb > 0) from the end face 21b (see FIG. 1) of the stator core 21. Also, at the other axial end of the stator core 21, the axial end portion 332 of the separation portion 33 is located at a position axially inwardly spaced a predetermined distance Lb from the axial end portion 31b of the slot insertion portion 31. In this case, the other end is the side where the second coil end portion 22b is provided.

[0033] A plurality of separators 33 are provided inside the resin bobbin 3. A plurality of segment coils 22 are inserted into the resin bobbin 3, and the segment coils 22 are arranged one by one in each of the compartments 315a separated by the separators 33. After being inserted into the resin bobbin 3 and arranged in the compartments 315a, the segment coils 22 are bent and welded at the end of the stator core 21 to form a coil (stator winding).

[0034] The bending process of the segment coil 22 will be described with reference to Fig. 5. Fig. 5 is an explanatory diagram for explaining the bending process of the segment coil 22.

[0035] When connecting segment coils 22 to form a stator winding, bending is required to bend the segment coil 22 radially on the first coil end portion 22a side. The segment coil before bending is indicated by a solid line and reference symbol 22', and the segment coil after bending is indicated by a dashed line and reference symbol 22. By bending the segment coil 22, a bent portion 222 is formed from the tip of the arrow 221 to the left side of the figure. If the axial end portion 33a of the separation portion 33 were located at the tip of the arrow 221, the axial end portion 33a of the separation portion 33 would be subjected to a large stress from the segment coil 22 being bent, and this could result in damage.

[0036] In order to achieve high power density and high continuous rated output, the rotating electric machine 1 desirably has a structure in which the coil 22 is directly cooled within the slot 211. In this embodiment, an oil passage is formed within the slot 211 to directly oil-cool the coil 22 within the slot 211. In this case, a resin bobbin 3 is used instead of insulating paper for insulation, from the perspective of ensuring a sufficient flow path area. Furthermore, in order to increase the space factor of the coil 22, the resin bobbin 3 must be made as thin as possible, which increases the possibility of the resin bobbin 3 being damaged during bending when forming the coil.

[0037] In this embodiment, by providing an axial gap La (La > 0) between the axial end 33a of the separation portion 33 and the end face 21a of the stator core 21, the axial end 33a of the separation portion 33 and the bending start position of the segment coil 22 are positioned at different axial positions, thereby preventing damage to the separation portion 33 during bending processing of the segment coil 22.

[0038] In the resin bobbin 3 of this embodiment, an axial gap Lb is provided between the axial end 33b (see FIG. 4) of the separation portion 33 and the end face 21b (see FIG. 1) of the stator core 21, so that even if the flange portion 32 is disposed on the side of the second coil end portion 22b, damage to the separation portion 33 can be prevented when bending the segment coil 22. However, to utilize the effect of the inclined portion 322 (see FIG. 3) when bending the segment coil 22 described above, it is preferable to dispose the flange portion 32 on the side of the first coil end portion 22a.

[0039] Although the segment coils 22 have an insulating coating, the use of a resin bobbin 3 improves the insulation between the segment coils 22 and the stator core 21, and between the segment coils 22 themselves. A refrigerant flows through the gaps between the coils 22 and the resin bobbin 3, using the interior of the resin bobbin 3, particularly each of the compartments 315a separated by the separators 33, as a flow path, thereby directly cooling the segment coils 22 within the slots 211. It is desirable to form a cooling water channel in the housing 23 that covers the outer peripheral surface of the stator core 21, through which cooling water flows, to enhance the cooling effect of the rotating electric machine 1. In this embodiment, cooling oil is used as the refrigerant.

[0040] As described above, the stator 2 of the rotating electrical machine 1 of this embodiment has the following configuration.

[0041] A stator 2 of a rotating electric machine 1 comprises: a stator core 21 in which slots 211 are formed; segment coils 22 inserted into the slots 211; and a resin bobbin 3 arranged between the stator core 21 and the segment coils 22, wherein the resin bobbin 3 comprises: a slot insertion portion 31 located inside the slots 211; and a separation portion 33 that separates adjacent segment coils 22 in the radial direction of the stator core 21 inside the slot insertion portion 31, and the separation portion 33 is formed on the side of one axial end face 21a of the stator core 21, at a position a predetermined distance La (La > 0) axially inward from one end face 21a of the stator core 21.

[0042] In addition, the segment coil 22 is bent radially on the side of one end surface 21 a of the stator core 21 and welded to other segment coils 2 .

[0043] The separation portion 33 is formed on the side of the other axial end face 21b of the stator core 21, at a position spaced a predetermined distance Lb (Lb>0) axially inward from the other axial end face 21b of the stator core 21.

[0044] [Modification 1] A first modification (modification 1) of the resin bobbin 3 will be described with reference to Fig. 6. Fig. 6 is a perspective view showing the first modification of the resin bobbin 3 according to the present invention.

[0045] In the stator 2 of the rotating electric machine 1 of this example, the separation portions 33 are formed in a protruding shape on the inner surface of the resin bobbin 3. In this case, the protruding separation portions 33 are provided on each of the two side wall portions 311, 312 of the slot insertion portion 31. The separation portions 33 provided on the side wall portion 311 and the separation portions 33 provided on the side wall portion 312 are arranged at the same position in the radial direction. For one section 315a, the separation portions 33 of the side wall portion 311 and the separation portions 33 of the side wall portion 312 are provided, which are arranged at the same position in the radial direction. The separation portions 33 of the side wall portion 311 and the separation portions 33 of the side wall portion 312 cooperate to support the segment coil 22 in the radial direction and regulate the radial position of the segment coil 22.

[0046] The other configurations are the same as those in the first embodiment described above.

[0047] By configuring the separating portion 33 as a protrusion and holding the segment coil 22 with this protrusion 33, it is possible to reduce the amount of material used for the holding member for the segment coil 22 and suppress the increase in cost for forming the resin bobbin 3. In addition, it is possible to increase the gap formed between adjacent segment coils 22, thereby creating a space for the flow of cooling oil.

[0048] [Modification 2] A second modification (modification 2) of the resin bobbin 3 will be described with reference to Fig. 7. Fig. 6 is a perspective view showing a first modification of the resin bobbin 3 according to the present invention.

[0049] In this example, unlike the first modified example, a space 34 is provided on the innermost peripheral side of the resin bobbin 3. That is, in the stator 2 of the rotating electric machine 1 of this example, the resin bobbin 3 has the space 34 on the innermost peripheral side.

[0050] Furthermore, in the resin bobbin 3 of this example, the axial distance Lb is not provided between the axial end 33b (see FIG. 4) of the separation portion 33 and the end face 21b (see FIG. 1) of the stator core 21, so the flange portion 32 cannot be positioned on the first coil end portion 22a side. Therefore, in this example, the flange portion 32 is positioned on the second coil end 22b side. In this example, the flange 32 can also function as a stopper, similar to the flange portion 32 of the first example. Other configurations can be configured in the same way as the first example and the first modified example.

[0051] In this example, as in the first modified example (Figure 6), by providing an axial gap Lb between the axial end 33b (see Figure 4) of the separation portion 33 and the end face 21b (see Figure 1) of the stator core 21, the flange portion 32 can be positioned on the side of the first coil end portion 22a.

[0052] The innermost circumferential side of the coil 22 generates the greatest AC copper loss, resulting in a large amount of heat generation. In this example, by increasing the amount of cooling oil in contact with the innermost circumferential side of the coil 22, higher cooling performance can be achieved. Furthermore, by inserting a magnetic body such as a magnetic wedge into the space 34, harmonic components of the magnetic flux due to the shape of the slot 211 can be suppressed, thereby suppressing the occurrence of torque ripples and the like. That is, the space 34 in this example constitutes a refrigerant flow path (cooling oil flow path) as well as a magnetic body accommodation portion.

[0053] [Modification 3] A third modification (Modification 3) of the resin bobbin 3 will be described with reference to Fig. 8. Fig. 8 is a perspective view showing the third modification of the resin bobbin according to the present invention.

[0054] In the stator 2 of the rotating electric machine 1 of this example, on the side of the other axial end face 21b of the stator core 21, the axial end 33b of the separation portion 33 is arranged at the same axial position as the axial end 3b of the resin bobbin 3. At this time, the segment coils 22 are bent radially on the side of one end face 21a of the stator core 21 and configured in a state where they are welded to other segment coils 22.

[0055] A flange portion 32 is provided at the axial end portion 3b of the resin bobbin 3. The flange portion 32 is disposed outside the slot 211 on the second coil end portion 22b side. In this example, the flange 32 can also function as a stopper, similar to the flange portion 32 in the first embodiment.

[0056] The axial length L33 of the separation portion 33 is shorter than the axial length L3 of the resin bobbin 3 (L33<L3) and shorter than the axial length L31 of the slot insertion portion 31 (L33<L31).

[0057] An axial end portion 3a of the resin bobbin 3 on the side of one axial end face 21a of the stator core 21 is configured by an axial end portion 31a of the slot insertion portion 31. In this case, the resin bobbin 3 is inserted into the slot 211 from the axial end portion 3a side. Note that the axial end portion 31a of the slot insertion portion 31 may be configured to protrude outside the slot 211 when the resin bobbin 3 is assembled in the slot 211.

[0058] In this example, when resin is poured from the axial end 3b side to form the resin bobbin 3, the resin can be poured without thickening from the resin flow start position. This improves the fluidity of the resin. This allows the mold for the resin bobbin 3 to be simplified, making molding easier.

[0059] [Modification 4] A fourth modification (Modification 4) of the resin bobbin 3 will be described with reference to Fig. 9. Fig. 9 is a perspective view showing the fourth modification of the resin bobbin 3 according to the present invention. Note that the stator core 21 is not shown in Fig. 9.

[0060] The stator core 21 of this example has an end plate 4 at the axial end 3a of the resin bobbin 3, which covers the periphery of the slot 211 and has openings 41 through which the segment coils 22 are inserted. The end plate 4 is configured separately from the resin bobbin 3. In this case, it is preferable to use a resin bobbin such as that shown in Figure 7 or Figure 8 as the resin bobbin 3. Note that Figure 9 shows an example in which the resin bobbin 3 shown in Figure 7 is used.

[0061] The axial end 3a of the resin bobbin 3 is formed by the axial end 31a of the slot insertion portion 31. The opening 41 of the end plate 4 is formed to correspond to the internal space 315 of the slot insertion portion 31 and communicates with the internal space 315 of the slot insertion portion 31. The slot insertion portion 31 of the resin bobbin 3 is inserted into the slot 211 from the axial end 31a side, and is integrated with the end plate 4 on the side of one end face 21a of the stator core 21.

[0062] The end plate 4 is disposed at the axial end 3a of the resin bobbin 3. The end plate 4 may be formed as a single annular member, or may be divided into multiple pieces in the circumferential direction. The material of the end plate 4 is preferably non-conductive, and may be made of a resin material such as LCP resin or PPS resin, or ceramic. The method of processing the end plate 4 may be machining, integral molding, or the like, and is not particularly limited.

[0063] The end plate 4 has an inclined portion 42 on the periphery of the opening 41. The inclined portion 42 is formed so that the opening area S41 of the opening 41 increases from the inside to the outside of the slot 211 in the axial direction of the stator core 21.

[0064] When bending the segment coil 22, stress is applied to the axial end 3a of the resin bobbin 3. By providing the inclined portion 42, it is possible to reduce the stress applied to the resin bobbin 3 and the segment coil 22 when bending the segment coil 22, thereby preventing damage to the resin bobbin 3 and the segment coil 22. In addition, by processing the inclined portion 42 into a shape that follows the bending direction of the segment coil 22, it can also be used as a bending jig for the segment coil 22.

[0065] The inclined portion 42 may be formed in a flat shape or a curved shape. The inclined portion 42 is formed around the entire periphery of the opening 41. The inclined portion 42 is more effective in preventing damage to the resin bobbin 3 and the segment coil 22 when formed in a curved shape than when formed in a flat shape.

[0066] There is no limitation on the size of the inclined portion 42 as long as it is a size that can be processed. The inclined portion 42 may be formed simultaneously with the molding of the end plate 4, or may be formed by processing the end plate 4 after molding.

[0067] The present invention is not limited to the above-described embodiments and modifications, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations. Furthermore, it is possible to replace part of the configuration of one modification with the configuration of another modification, and it is also possible to add the configuration of one modification to the configuration of another modification. Furthermore, it is possible to add, delete, or replace part of the configuration of the embodiments and modifications with other configurations.

[0068] 1...rotating electric machine, 2...stator, 3...resin bobbin, 3a...axial end of resin bobbin 3, 3b...axial end of resin bobbin 3, 4...end plate, 21...stator core, 21a...one axial end face of stator core 21, 21b...other axial end face of stator core 21, 22...segment coil (coil), 31...slot insertion portion, 31a...axial end of slot insertion portion 31, 32...flange portion, 33...separation portion, 33b...axial end of separation portion 33, 34...space portion on the innermost side of resin bobbin 3, 41...opening of end plate 4, 42...inclined portion of end plate 4, 211...slot

Claims

1. A stator for a rotating electric machine comprising: a stator core in which slots are formed; segment coils inserted into the slots; and a resin bobbin arranged between the stator core and the segment coils, wherein the resin bobbin comprises: a slot insertion portion located inside the slot; and a separation portion that separates adjacent segment coils in the radial direction of the stator core inside the slot insertion portion, and the separation portion is formed on the side of one axial end face of the stator core, at a position a predetermined distance axially inward from the one end face of the stator core.

2. A stator for a rotating electric machine as described in claim 1, wherein the segment coils are bent radially on the side of the one end face of the stator core and welded to other segment coils.

3. A stator for a rotating electric machine according to claim 2, wherein the separation portion is formed on the side of the other axial end face of the stator core, at a position a predetermined distance inward in the axial direction from the other end face of the stator core.

4. A stator for a rotating electric machine according to claim 1, wherein the separating portion is formed in the shape of a protrusion on the inner surface of the resin bobbin.

5. A stator for a rotating electric machine according to claim 1, wherein the resin bobbin has a space on its innermost periphery.

6. A stator for a rotating electric machine as described in claim 1, wherein, on the other axial end face side of the stator core, the axial end of the separation portion is positioned at the same axial position as the axial end of the slot insertion portion of the resin bobbin.

7. A stator for a rotating electric machine as described in claim 6, wherein the segment coils are bent radially on the side of the one end face of the stator core and welded to other segment coils.

8. A stator for a rotating electric machine according to claim 1, wherein the resin bobbin has a flange portion provided at the axial end of the slot insertion portion and integral with the slot insertion portion.

9. A stator for a rotating electric machine as described in claim 1, wherein the stator core has an end plate at the axial end of the resin bobbin that covers the periphery of the slot and has an opening through which the segment coil is inserted, and the end plate is a stator for a rotating electric machine that is constructed separately from the resin bobbin.

10. A stator for a rotating electric machine as described in claim 9, wherein the end plate has an inclined portion on the periphery of the opening, and the inclined portion is formed so that the opening area of the opening increases from the inside to the outside of the slot in the axial direction of the stator core.

11. A rotating electric machine comprising a rotor and a stator, the stator comprising the stator of claim 1.

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