Stator and stator fixing structure

Abstract

A stator core (24) of a stator (10) is provided with a plurality of U-shaped split cores (241). Each among the plurality of split cores (241) is formed from a plurality of electromagnetic steel sheets (S) laminated in a direction orthogonal to the axial direction of the stator core (24). Each split core (241) is provided with a connection part (32) that connects a first leg part (301) and a second leg part (302), which both extend in the radial direction of the stator core (24), to each other. Each connection part (32) has a linear portion (36) extending in a direction orthogonal to the axial direction and the radial direction of the stator core (24), and the linear portion (36) faces a separation region (B) provided between coils (26) in the radial direction of the stator core (24).

Description

Stator and stator fixing structure

[0001] The present invention relates to a stator and a fixing structure for the stator.

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have become more active, and research and development into electrification technology has been conducted to reduce CO2 emissions and improve energy efficiency in vehicles. Japanese Patent Application Laid-Open Publication No. 4-325845 discloses a stator with U-shaped teeth made of laminated magnetic metal foil. Coils are wound around each of the multiple teeth, and the multiple teeth are fixed to the inner periphery of an annular stator core.

[0003] However, in a stator such as that disclosed in Japanese Patent Laid-Open Publication No. 4-325845, which relates to motorization technology, it is necessary to attach multiple teeth to the stator core in appropriate positions. Solving this problem will contribute to improving energy efficiency.

[0004] The present invention aims to solve the above-mentioned problems.

[0005] A first aspect of the present invention is a stator comprising an annular stator core and a plurality of coils wound around a plurality of teeth provided on the stator core, the stator core being composed of a plurality of U-shaped split cores connected in a circumferential direction, the plurality of teeth being spaced apart from one another in the circumferential direction, each of the plurality of split cores being formed from a plurality of electromagnetic steel plates laminated in a direction perpendicular to the axial direction of the stator core, and each of the plurality of split cores having a first leg portion extending in a radial direction of the stator core, a second leg portion spaced apart from the first leg portion in one side of the circumferential direction and extending in the radial direction, and and a connecting portion provided radially outward from the first leg portion and the second leg portion and connecting the first leg portion and the second leg portion to each other, wherein each of the plurality of teeth is constituted by the first leg portion of one of the split cores adjacent to each other in the circumferential direction and the second leg portion of the other of the split cores adjacent to each other in the circumferential direction, the connecting portion having a straight portion extending in a direction perpendicular to the axial direction and the radial direction of the stator core, the coils adjacent to each other in the circumferential direction being separated in the circumferential direction via a separation region, and at least a portion of the straight portion facing the separation region in the radial direction.

[0006] A second aspect of the present invention is a fixing structure for a stator having a stator including an annular stator core and a plurality of coils wound around a plurality of teeth provided on the stator core, the stator core being composed of a plurality of U-shaped split cores connected in a circumferential direction, and the stator being accommodated and fixed in an accommodating portion of a housing, wherein the plurality of teeth are spaced apart from one another in the circumferential direction, and each of the plurality of split cores is formed from a plurality of electromagnetic steel plates laminated in a direction perpendicular to the axial direction of the stator core, and each of the plurality of split cores includes a first leg portion extending in a radial direction of the stator core, a second leg portion spaced from the first leg portion to one side in the circumferential direction and extending in the radial direction, and a connecting portion provided radially outward of the first leg portion and the second leg portion and connecting the first leg portion and the second leg portion to each other, and each of the plurality of teeth is the coils are configured with the first leg portion of one of the split cores adjacent to each other in the circumferential direction and the second leg portion of the other of the split cores adjacent to each other in the circumferential direction, the connecting portion has a straight portion extending in a direction perpendicular to the axial direction and the radial direction of the stator core, and curved portions connecting the first leg portion and the second leg portion to the straight portion, respectively, and formed in a convex shape radially outward, the coils adjacent to each other in the circumferential direction are separated in the circumferential direction via a separation region, at least a portion of the straight portion faces the separation region in the radial direction, the straight portion has an outer surface facing radially outward and an inner surface facing radially inward, and the accommodating portion of the housing comprises an outer guide portion abutting the outer surface of the straight portion, and an inner guide portion provided radially inward of the outer guide portion and abutting the inner surface of the straight portion.

[0007] According to the present invention, when the stator is placed inside the housing, the linear portions of the split cores contact the housing, thereby effectively positioning the stator core in the radial direction. This improves the ease of assembly of the stator. Furthermore, because at least a portion of the linear portions of the split cores faces the separation region in the radial direction, contact between the coil and the housing is effectively avoided when the linear portions of the split cores contact the housing.

[0008] Fig. 1 is a configuration diagram of an electric vehicle equipped with a stator according to an embodiment of the present invention. Fig. 2 is an enlarged side view of a swing arm of the electric vehicle shown in Fig. 1. Fig. 3 is an enlarged side view of a rotating electric machine including the stator of Fig. 2. Fig. 4 is a plan view of a split core constituting a stator core. Fig. 5 is an enlarged side view of the stator core of Fig. 3. Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 3.

[0009] As shown in FIG. 1 , the stator 10 according to this embodiment constitutes a rotating electric machine 12. The rotating electric machine 12 is, for example, an electric motor that is mounted on an electric vehicle E and provides driving force to drive wheels (rear wheels R). The rotating electric machine 12 including the stator 10 is not limited to being used as an electric motor mounted on an electric vehicle E. The rotating electric machine 12 including the stator 10 may also be a motor / generator. The rotating electric machine 12 including the stator 10 may also be a generator. Below, a case where the stator 10 constitutes the rotating electric machine 12 that is an electric motor will be described.

[0010] As shown in Figure 2, the rotating electric machine 12 is housed in a housing portion 141 of a swing arm 14 of the electric vehicle E. A front end portion 14F of the swing arm 14 is supported by a pivot shaft 18 provided on a body frame 16 (see Figure 1) of the electric vehicle E. A rear end portion 14R of the swing arm 14 is an end portion disposed at the rear of the electric vehicle E. The rear end portion 14R of the swing arm 14 is disposed to the side of a rear wheel R (see Figure 1) and rotatably supports the rear wheel R, which is a drive wheel.

[0011] As shown in Fig. 3, the rotating electric machine 12 includes a rotor 20, a cylindrical stator 10 surrounding the rotor 20, and an annular bus ring 22. The rotor 20 has a rotor body 201 and a rotating shaft 202. A plurality of magnets (not shown) are provided on the outer periphery of the rotor body 201. The rotating shaft 202 is press-fitted into the center of the rotor body 201 along the axial direction of the rotor body 201. The rotor body 201 and the rotating shaft 202 are connected to each other and rotate integrally.

[0012] The stator 10 includes an annular stator core 24 and a plurality of coils 26 wound around the stator core 24. The stator core 24 includes a plurality of split cores 241 and a plurality of teeth 242.

[0013] Each of the multiple split cores 241 is U-shaped when viewed in the axial direction of the stator core 24 (see FIG. 4). An open end of each of the multiple split cores 241 is disposed radially inward. The multiple split cores 241 are arranged in parallel with one another along the circumferential direction of the stator 10. The multiple split cores 241 arranged in parallel form the annular stator core 24.

[0014] As shown in FIG. 4 , each of the multiple split cores 241 is formed from multiple electromagnetic steel sheets S stacked in a direction perpendicular to the axial direction of the stator core 24. As shown in FIG. 4 , each of the multiple electromagnetic steel sheets S is a grain-oriented electromagnetic steel sheet GS. The grain-oriented electromagnetic steel sheet GS is a steel sheet that has excellent magnetic properties only in the rolling direction of the steel sheet. The electromagnetic steel sheets S are stacked so that the direction in which the grain-oriented electromagnetic steel sheet GS has its magnetic properties (hereinafter referred to as characteristic direction A) is perpendicular to the axial direction of the stator 10. In other words, the characteristic direction A of the electromagnetic steel sheet S is perpendicular to the thickness direction of the electromagnetic steel sheet S. Each of the multiple split cores 241 has the characteristic direction A in a direction perpendicular to the axial direction of the stator core 24. By stacking the multiple electromagnetic steel sheets S (grain-oriented electromagnetic steel sheets GS), a U-shaped split core 241 is formed.

[0015] For example, the split core 241 is manufactured by winding rolled grain-oriented electromagnetic steel sheets GS multiple times around the outer periphery of a jig (not shown) to form an annular laminate M, and then cutting a portion of the annular laminate M to form a U-shaped split core 241. At this time, the grain-oriented electromagnetic steel sheets GS are stacked (wound) so that the characteristic direction A of the grain-oriented electromagnetic steel sheets GS is perpendicular to the winding center of the laminate M and parallel to the winding direction. Note that each of the multiple electromagnetic steel sheets S is not limited to being a grain-oriented electromagnetic steel sheet GS. For example, each of the multiple electromagnetic steel sheets S may be a non-oriented electromagnetic steel sheet.

[0016] As shown in Fig. 5, each of the multiple split cores 241 includes a first end face 281 and a second end face 282 (see Fig. 6), a first leg portion 301 and a second leg portion 302, and a connecting portion 32 (see Fig. 6). As shown in Fig. 6, the first end face 281 is provided on one axial side of the stator core 24. The second end face 282 is provided on the other axial side of the stator core 24. Each of the first end face 281 and the second end face 282 is a plane that intersects with the axial direction of the stator core 24.

[0017] As shown in Fig. 5, the first leg 301 and the second leg 302 each extend in the radial direction of the stator core 24. The first leg 301 and the second leg 302 are spaced apart from each other in the circumferential direction of the stator core 24. The radial direction in which the first leg 301 and the second leg 302 extend is the characteristic direction A of the grain-oriented electrical steel sheet GS (see Fig. 4).

[0018] The connecting portion 32 is provided radially outward of the first leg portion 301 and the second leg portion 302. As shown in FIG. 4 , the connecting portion 32 connects the first end portion 341 and the second end portion 342 to each other. The first end portion 341 is the radially outer end portion of the first leg portion 301. The second end portion 342 is the radially outer end portion of the second leg portion 302. The extending directions of the first leg portion 301 and the second leg portion 302 intersect with the extending direction of the connecting portion 32. The extending direction of the connecting portion 32 is the characteristic direction A of the grain-oriented electrical steel sheet GS (see FIG. 4 ). As shown in FIG. 5 , a plurality of split cores 241 are connected in parallel in the circumferential direction, and each connecting portion 32 constitutes the outer circumferential portion 24a of the stator core 24.

[0019] The connection portion 32 further includes a straight portion 36 and a pair of curved portions 381, 382. The straight portion 36 extends linearly in a direction perpendicular to the axial and radial directions of the stator core 24. The straight portion 36 is provided in the center of the connection portion 32 in the extension direction (see FIG. 4 ). The straight portion 36 has an outer surface 361 and an inner surface 362. The outer surface 361 of the straight portion 36 faces radially outward of the stator core 24. The inner surface 362 of the straight portion 36 faces radially inward of the stator core 24. The outer surface 361 and the inner surface 362 are parallel to each other.

[0020] The pair of curved portions 381, 382 are formed in a convex shape facing radially outward of the stator core 24. The pair of curved portions 381, 382 respectively connect the first leg portion 301 and the second leg portion 302 to the straight portion 36. One curved portion 381 connects one end of the straight portion 36 to the first end 341 of the first leg 301. The other curved portion 382 connects the other end of the straight portion 36 to the second end 342 of the second leg 302.

[0021] In each of the multiple split cores 241, the first leg portion 301 and the second leg portion 302 extend radially inward from the connecting portion 32 so that the first leg portion 301 and the second leg portion 302 approach each other.

[0022] Each of the multiple split cores 241 has multiple electromagnetic steel plates S stacked in the circumferential direction perpendicular to the axial direction of the stator core 24 at the first leg portion 301 and the second leg portion 302, and multiple electromagnetic steel plates S (directional electromagnetic steel plates GS) stacked in the radial direction perpendicular to the axial direction of the stator core 24 at the connection portion 32.

[0023] In the circumferential direction of the stator core 24, the first side surface 401 of the first leg portion 301 of one of the adjacent split cores 241 abuts against the second side surface 402 of the second leg portion 302 of the other of the adjacent split cores 241 in the circumferential direction.

[0024] As shown in Fig. 3, the multiple teeth 242 are spaced apart from one another in the circumferential direction of the stator core 24. As shown in Fig. 5, each of the multiple teeth 242 is made up of a first leg portion 301 of one of the split cores 241 that are adjacent to each other in the circumferential direction and a second leg portion 302 of the other of the split cores 241 that are adjacent to each other in the circumferential direction. The teeth 242 extend in the radial direction of the stator core 24.

[0025] The plurality of coils 26 are wound around the plurality of teeth 242 of the stator core 24. Each of the plurality of coils 26 is wound in an annular shape when viewed in the direction in which the teeth 242 extend. Each of the plurality of coils 26 is wound around each of the plurality of teeth 242. The plurality of coils 26 are adjacent to one another in the circumferential direction of the stator 10.

[0026] Circumferentially adjacent coils 26 are spaced apart from each other in the circumferential direction of the stator core 24. In the stator core 24, a separation region B is formed between two circumferentially adjacent coils 26. The separation region B is a radial space provided between two coils 26 in the multiple split cores 241. In the radial direction of the stator core 24, the inner surface 362 of the straight portion 36 faces the separation region B. Note that only a portion of the straight portion 36 may face the separation region B, or the entire straight portion 36 may face the separation region B. Ends of the coils 26 are connected to conductive members (not shown) provided on the bus ring 22.

[0027] Each of the multiple split cores 241 has its first leg 301 and second leg 302 (teeth 242) inserted radially from the outside to the inside of the stator 10 into the center of the annularly wound coil 26, thereby forming a stator 10 in which the multiple split cores 241 and the multiple coils 26 are assembled in a circular arrangement (see the dotted line shape in Figure 5).

[0028] As shown in Fig. 2, the swing arm 14 of the electric vehicle E includes a housing 42 having a storage portion 141. The storage portion 141 of the housing 42 opens outward in the vehicle width direction of the body frame 16 (see Fig. 1). As shown in Fig. 1, a cover portion C is attached to the housing 42 from the vehicle width direction, so that the storage portion 141 is closed by the cover portion C.

[0029] As shown in FIG. 3 , the accommodation portion 141 has an annular support wall 44 against which the first end faces 281 of the split cores 241 respectively abut. A support surface 46 of the support wall 44 is perpendicular to the axial direction of the accommodation portion 141 (see FIG. 6 ). The connection portions 32 of the split cores 241 abut against the support surface 46 of the support wall 44. In the accommodation portion 141, the stator core 24 is supported in the axial direction of the stator core 24 by the support wall 44. As shown in FIG. 3 , the support wall 44 has a plurality of fastening holes 47 that open to the support surface 46.

[0030] As shown in Fig. 5, the support wall 44 of the storage section 141 includes a plurality of outer guide portions 48 and a plurality of inner guide portions 50. The outer guide portions 48 and the inner guide portions 50 are provided along the support wall 44 (see Fig. 3). The number of the outer guide portions 48 is the same as the number of the inner guide portions 50. However, the number of the outer guide portions 48 and the number of the inner guide portions 50 may be different.

[0031] Each of the multiple outer guide portions 48 faces each of the multiple inner guide portions 50 in the radial direction of the stator core 24. The outer guide portions 48 are provided along the outer edge portion 441 of the support wall 44. The outer guide portions 48 have a rectangular shape that is long in the extension direction of the support wall 44 and short in the radial direction. Note that the outer guide portions 48 are not limited to being formed in a rectangular shape. For example, the outer guide portions 48 may be square when viewed in the axial direction of the accommodation portion 141.

[0032] The multiple outer guide portions 48 are provided radially outward of the multiple straight portions 36 of the multiple split cores 241. Each of the multiple outer guide portions 48 has a first support portion 481 at its radially inner end. The outer surfaces 361 of the multiple straight portions 36 abut against each of the multiple first support portions 481. The number of outer guide portions 48 is the same as the number of split cores 241. Note that the number of outer guide portions 48 and the number of split cores 241 may be different.

[0033] The multiple inner guide portions 50 are provided on the inner edge portion 442 of the support wall 44. Each of the multiple inner guide portions 50 protrudes radially inward from the inner edge portion 442 of the support wall 44 (see FIG. 6 ). When viewed in the axial direction of the accommodating portion 141, each of the multiple inner guide portions 50 has a triangular shape that tapers radially inward from the support wall 44. In the circumferential direction of the stator core 24, the length of each of the multiple outer guide portions 48 is longer than the length of each of the multiple inner guide portions 50. Note that the inner guide portions 50 are not limited to being formed in a triangular shape extending radially inward. For example, when viewed in the axial direction of the accommodating portion 141, the inner guide portions 50 may be rectangular.

[0034] The multiple inner guide portions 50 are provided radially inward of the multiple straight portions 36 of the multiple split cores 241. Each of the multiple inner guide portions 50 is disposed in the separation region B of the stator core 24. That is, each of the multiple inner guide portions 50 is disposed between two circumferentially adjacent coils 26 of the stator core 24. Each of the multiple inner guide portions 50 is not in contact with the two circumferentially adjacent coils 26. Each of the multiple inner guide portions 50 includes a second support portion 501 at its radially outer end. The inner surfaces 362 of the multiple straight portions 36 abut against each of the multiple second support portions 501.

[0035] That is, the multiple straight portions 36 of the multiple split cores 241 are supported in the radial direction of the stator core 24 by the multiple outer guide portions 48 and the multiple inner guide portions 50. The number of inner guide portions 50 is the same as the number of split cores 241. The number of inner guide portions 50 may be different from the number of split cores 241. The accommodating portion 141 of the swing arm 14 is not limited to a case in which it includes both multiple outer guide portions 48 and multiple inner guide portions 50. For example, the accommodating portion 141 may include only multiple outer guide portions 48, and only the outer peripheral portion 24a of the stator core 24 (outer surfaces 361 of the straight portions 36) may be supported by the multiple outer guide portions 48.

[0036] As shown in FIG. 3 , a ring member 52 is attached to the second end surfaces 282 of the multiple split cores 241. The ring member 52 is an annular plate. The outer periphery of the ring member 52 covers the support wall 44 of the housing 42. The inner periphery of the ring member 52 is positioned radially outward of the multiple coils 26. With the ring member 52 abutting against the second end surfaces 282 of the multiple split cores 241, multiple fastening members 54 inserted through the ring member 52 are fastened to the fastening holes 47 of the support wall 44. The multiple split cores 241 are each sandwiched between the ring member 52 and the support surface 46 of the support wall 44.

[0037] This embodiment has the following advantages.

[0038] 5 , the stator core 24 of the stator 10 has a plurality of split cores 241, each of which is formed from a plurality of electromagnetic steel plates S stacked in a direction perpendicular to the axial direction of the stator core 24. Each of the plurality of split cores 241 has a first leg portion 301 and a second leg portion 302 extending in the radial direction of the stator core 24, and a connecting portion 32 connecting the first leg portion 301 and the second leg portion 302 to each other. The connecting portion 32 has a straight portion 36 perpendicular to the axial and radial directions of the stator core 24, and the straight portion 36 faces a separation region B between circumferentially adjacent coils 26 in the radial direction of the stator core 24.

[0039] According to this configuration, when the stator 10 is accommodated inside the housing 42, the linear portions 36 of the split cores 241 come into contact with the housing 42, thereby effectively positioning the stator core 24 in the radial direction, thereby improving the ease of assembly of the stator 10. Furthermore, because at least a portion of the linear portions 36 of the split cores 241 faces the separation region B in the radial direction, contact between the coils 26 and the housing 42 is effectively avoided when the linear portions 36 of the split cores 241 are brought into contact with the housing 42.

[0040] 4, each of the electromagnetic steel sheets S of the multiple split cores 241 is a grain-oriented electromagnetic steel sheet GS. As a result, compared to when each of the multiple split cores 241 is formed from a non-oriented electromagnetic steel sheet, by forming each of the multiple split cores 241 from a grain-oriented electromagnetic steel sheet GS, it is possible to effectively suppress iron loss and improve energy conversion efficiency.

[0041] 5, the connection portions 32 of the multiple split cores 241 have curved portions 381, 382 that connect the first leg portion 301 and the second leg portion 302 to the straight portion 36, respectively, and that are convex outward in the radial direction. As shown in FIG. 3, the accommodating portion 141 of the housing 42 that accommodates the stator 10 includes an outer guide portion 48 that abuts against an outer surface 361 of the straight portion 36, and an inner guide portion 50 that is provided radially inward of the outer guide portion 48 and abuts against an inner surface 362 of the straight portion 36.

[0042] According to this configuration, the split core 241 can be fixed to the housing 42 so as to be sandwiched from both the radially outer and inner sides by the outer guide portion 48 and the inner guide portion 50. This effectively prevents the split core 241 from moving in the circumferential and radial directions while housed in the housing portion 141 of the housing 42. Furthermore, the electromagnetic steel sheet S is characterized by lower thermal conductivity in the thickness direction than in a direction intersecting the thickness direction. Since each layer of the electromagnetic steel sheet S directly abuts against the housing 42 (support wall 44) in a direction intersecting the thickness direction, heat dissipation from each layer of the electromagnetic steel sheet S to the housing 42 can be improved. This effectively improves thermal conductivity from the stator 10 (stator core 24) to the housing 42.

[0043] In addition to the above disclosure, the following additional notes are disclosed.

[0044] (Note 1) A stator (10) includes an annular stator core (24) and a plurality of coils (26) wound around a plurality of teeth (242) provided on the stator core, the stator core being configured from a plurality of U-shaped split cores (241) connected in a circumferential direction, the plurality of teeth being spaced apart from one another in the circumferential direction, each of the plurality of split cores being formed from a plurality of electromagnetic steel sheets (S) laminated in a direction perpendicular to the axial direction of the stator core, and each of the plurality of split cores having a first leg portion (301) extending in a radial direction of the stator core and a second leg portion (302) spaced apart from the first leg portion in one circumferential direction and extending in the radial direction. ) and a connecting portion (32) provided radially outward of the first leg portion and the second leg portion and connecting the first leg portion and the second leg portion to each other, each of the plurality of teeth is composed of the first leg portion of one of the split cores adjacent to each other in the circumferential direction and the second leg portion of the other of the split cores adjacent to each other in the circumferential direction, the connecting portion has a straight portion (36) extending in a direction perpendicular to the axial direction and the radial direction of the stator core, the coils adjacent to each other in the circumferential direction are separated in the circumferential direction via a separation region (B), and at least a part of the straight portion faces the separation region in the radial direction.

[0045] With this configuration, when the stator is placed inside the housing, the linear portions of the split cores contact the housing, effectively positioning the stator core in the radial direction. This improves the ease of assembly of the stator. Furthermore, because at least a portion of the linear portions of the split cores faces the separation region in the radial direction, contact between the coil and the housing is effectively avoided when the linear portions of the split cores contact the housing.

[0046] (Supplementary Note 2) In the stator described in Supplementary Note 1, each of the electromagnetic steel sheets of the plurality of split cores may be a grain-oriented electromagnetic steel sheet (GS). According to this configuration, compared to when each of the plurality of split cores is formed from a non-oriented electromagnetic steel sheet, by forming each of the plurality of split cores from a grain-oriented electromagnetic steel sheet, it is possible to effectively suppress iron loss and improve energy conversion efficiency.

[0047] (Supplementary Note 3) A fixing structure of a stator has a stator including an annular stator core and a plurality of coils wound around a plurality of teeth provided on the stator core, the stator core being made up of a plurality of U-shaped split cores connected in a circumferential direction, and the stator is accommodated and fixed in an accommodating portion (141) of a housing (42), the plurality of teeth are provided at intervals from one another in the circumferential direction, each of the plurality of split cores is formed from a plurality of electromagnetic steel plates laminated in a direction perpendicular to the axial direction of the stator core, and each of the plurality of split cores includes a first leg portion extending in a radial direction of the stator core, a second leg portion spaced from the first leg portion to one side in the circumferential direction and extending in the radial direction, and a connecting portion provided radially outward from the first leg portion and the second leg portion and connecting the first leg portion and the second leg portion to each other, and each of the plurality of teeth is arranged adjacent to one another in the circumferential direction. the connecting portion has a straight portion extending in a direction perpendicular to the axial direction and the radial direction of the stator core, and curved portions (381, 382) that connect the first leg portion and the second leg portion to the straight portion and are formed in a convex shape radially outward; the coils that are adjacent to each other in the circumferential direction are separated from each other in the circumferential direction by a separation region, and at least a portion of the straight portion faces the separation region in the radial direction; the straight portion has an outer surface (361) facing radially outward and an inner surface (362) facing radially inward; and the accommodating portion of the housing has an outer guide portion (48) that abuts the outer surface of the straight portion, and an inner guide portion (50) that is provided radially inward of the outer guide portion and abuts the inner surface of the straight portion.

[0048] With this configuration, the split core can be fixed to the housing by being sandwiched between the outer guide portion and the inner guide portion from both the radially outer and inner sides, thereby effectively preventing the split core from moving circumferentially and radially while housed in the housing housing portion.

[0049] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention.

[0050] REFERENCE SIGNS LIST 10... stator 24... stator core 26... coil 32... connection portion 36... straight portion 241... split core 242... teeth 301... first leg portion 302... second leg portion B... separation region S... electromagnetic steel plate

Claims

1. A stator (10) comprising an annular stator core (24) and a plurality of coils (26) wound around a plurality of teeth (242) provided on the stator core (24), the stator core (24) being composed of a plurality of U-shaped split cores (241) connected in the circumferential direction, wherein the plurality of teeth (242) are spaced apart from one another in the circumferential direction, each of the plurality of split cores (241) being formed from a plurality of electromagnetic steel plates (S) laminated in a direction perpendicular to the axial direction of the stator core (24), each of the plurality of split cores (241) having a first leg (301) extending in the radial direction of the stator core (24), and a second leg (302) spaced apart from the first leg (301) to one side in the circumferential direction and extending in the radial direction, and a connecting portion (32) that is provided radially outward of the first leg portion (301) and the second leg portion (302) and connects the first leg portion (301) and the second leg portion (302) to each other, wherein each of the plurality of teeth (242) is constituted by the first leg portion (301) of one of the divided cores (241) that are adjacent to each other in the circumferential direction and the second leg portion (302) of the other of the divided cores (241) that are adjacent to each other in the circumferential direction, the connecting portion (32) has a straight portion (36) that extends in a direction perpendicular to the axial direction and the radial direction of the stator core (24), the coils (26) that are adjacent to each other in the circumferential direction are separated in the circumferential direction via a separation region (B), and at least a part of the straight portion (36) faces the separation region (B) in the radial direction.

2. A stator (10) according to claim 1, wherein each of the electromagnetic steel sheets (S) of the plurality of split cores (241) is a grain-oriented electromagnetic steel sheet (GS).

3. A fixing structure for a stator (10) comprising a stator (10) including an annular stator core (24) and a plurality of coils (26) wound around a plurality of teeth (242) provided on the stator core (24), the stator core (24) being made up of a plurality of U-shaped split cores (241) connected in the circumferential direction, the stator (10) being accommodated and fixed in an accommodating section (141) of a housing (42), wherein the plurality of teeth (242) are spaced apart from one another in the circumferential direction, each of the plurality of split cores (241) being formed from a plurality of electromagnetic steel plates (S) laminated in a direction perpendicular to the axial direction of the stator core (24), and each of the plurality of split cores (241) having a first leg (301) extending radially of the stator core (24), a second leg portion (302) extending in the radial direction, spaced apart from the first leg portion (301) to one side in the circumferential direction; and a connecting portion (32) provided radially outward of the first leg portion (301) and the second leg portion (302) and connecting the first leg portion (301) and the second leg portion (302) to each other, wherein each of the plurality of teeth (242) is constituted by the first leg portion (301) of one of the divided cores (241) adjacent to each other in the circumferential direction and the second leg portion (302) of the other of the divided cores (241) adjacent to each other in the circumferential direction, and the connecting portion (32) is constituted by a straight portion (36) extending in a direction perpendicular to the axial direction and the radial direction of the stator core (24), the coils (26) adjacent to each other in the circumferential direction are spaced apart in the circumferential direction via a spaced apart region (B), and at least a part of the straight portion (36) faces the spaced apart region (B) in the radial direction; the straight portion (36) has an outer surface (361) facing outward in the radial direction and an inner surface (362) facing inward in the radial direction; and the accommodating portion (141) of the housing (42) has: an outer guide portion (48) abutting against the outer surface (361) of the straight portion (36);an inner guide portion (50) provided radially inward of the outer guide portion (48) and in contact with the inner surface (362) of the straight portion (36).

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