Stator of a rotating electrical machine

Abstract

To provide a stator of a rotary electric machine capable of suppressing resonance of the stator by making annular rigidity of a coil become uneven.SOLUTION: A stator 10 of a rotary electric machine MG is provided with: a cylindrical stator core 20 with an axial line CL as a center; a plurality of connection parts 36 arranged on one end face 20a side of the stator core 20 in the axial line CL direction and protruding to an outer side in the axial line CL direction than the one end face 20a at each position corresponding to a tooth part 24 of the stator core 20; and a coil 50 inserted in a slot 22 of the stator core 20 and coming into contact with each of the plurality of connection parts 36 by being bent in a circumferential direction of the stator core 20 on an outer side in the axial line CL direction than the one end face 20a. Three types of connection parts having different contact situations with the coil 50 are arranged in a circumferential direction, including a first connection part 36a, a second connection part 36b and a third connection part 36c.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a stator for a rotating electric machine in which coils are bent in the circumferential direction of a stator core and contact a plurality of cuffs, respectively, outside one end face of the stator core in the axial direction. [Background technology]

[0002] There are known stators for rotating electrical machines in which a coil is bent in the circumferential direction of a stator core and is in contact with two types of cuffs provided on an annular cuff, respectively. For example, the stator for a rotating electrical machine described in Patent Document 1 is such a stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-244800 Summary of the Invention [Problem to be solved by the invention]

[0004] In the stator of the rotating electric machine described in Patent Document 1, in order to easily ensure insulation between coils of different phases, a component cuff is used in which two types of cuffs with different lengths from the end face of the stator core are alternately arranged in the circumferential direction of the stator. The stator of the rotating electric machine described in Patent Document 1 does not mention at all the problem of suppressing resonance of the stator.

[0005] The present invention has been made against the background of the above circumstances, and its object is to provide a stator for a rotating electric machine that can suppress stator resonance by making the ring stiffness of the coil uneven. [Means for solving the problem]

[0006] The gist of a first invention is a stator for a rotating electric machine comprising: a cylindrical stator core centered on an axis; a plurality of cuffs disposed on one end face of the stator core in the axial direction and protruding outward in the axial direction from the one end face at positions corresponding to respective teeth of the stator core; and coils inserted into slots of the stator core and bent in the circumferential direction of the stator core outside the one end face in the axial direction so as to be in contact with each of the plurality of cuffs, Depending on at least one of the width of the stator core in the circumferential direction, the radius of curvature of the contact portion with the coil, and the flexibility of the stator core in the circumferential direction Three or more types of cuffs with different contact states with the coil are arranged in the circumferential direction of the stator core. attitude The reason is that this is happening.

[0008] No. 2 The gist of the invention is the first Clearly In this case, (a) three or more types of cuffs having different contact states with the coil are arranged in the circumferential direction of the stator core, and (b) adjacent cuffs in the circumferential direction of the stator core are different types from the three or more different types. [Effects of the Invention]

[0011] According to the stator of the rotating electric machine of the first invention, Depending on at least one of the width of the stator core in the circumferential direction, the radius of curvature of the contact portion with the coil, and the flexibility of the stator core in the circumferential direction Three or more types of cuffs with different contact states with the coil are arranged in the circumferential direction of the stator core. attitude Because multiple cuffs with different contact states with the coil are provided, the portions of the coil that contact the multiple cuffs are bent in different states. This results in non-uniform ring stiffness of the coil compared to when only cuffs of the same type are provided that contact the coil. Because the ring stiffness of the coil is non-uniform, the ring stiffness of the stator is also non-uniform, thereby suppressing stator resonance.

[0013] No. 2 According to the stator of the rotating electric machine of the present invention, 、(a) three or more types of cuffs having different contact states with the coil are arranged in the circumferential direction of the stator core, and (b) adjacent cuffs in the circumferential direction of the stator core are different types from the three or more different types. When adjacent cuffs in the circumferential direction of the stator core are of different types, the ring rigidity of the coil is non-uniform in the circumferential direction compared to when this is not the case, and resonance of the stator is suppressed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a stator of a rotating electric machine according to a first embodiment of the present invention. [Figure 2] 3 is a perspective view of a first component cuff and a second component cuff disposed on a stator core. FIG. [Figure 3] 2A and 2B are diagrams illustrating a method of winding a coil around the stator core shown in FIG. 1, in which (a) shows the state in which a segment coil is inserted into a slot, expanded circumferentially on the stator core and viewed from the inner periphery to the outer periphery, and (b) shows the state in which the segment coil is connected by welding, expanded circumferentially on the stator core and viewed from the inner periphery to the outer periphery. [Figure 4] 2A to 2C are diagrams illustrating steps in a method of winding a coil around a tooth portion of the stator core shown in FIG. [Figure 5] This is a diagram explaining a method of winding a coil around a stator core of a rotating electric machine according to Example 2 of the present invention, and shows the state in which the segment coils are connected by welding, expanded circumferentially on the stator core and viewed from the inner side to the outer side. [Figure 6] This is a diagram explaining a method of winding a coil around a stator core of a rotating electric machine according to Example 3 of the present invention, and shows the state in which the segment coils are connected by welding, expanded circumferentially on the stator core and viewed from the inner side to the outer side. [Figure 7]10A and 10B are diagrams illustrating a method of winding a coil around a stator core of a rotating electric machine according to a fourth embodiment of the present invention, in which (a) is a diagram showing the state in which a segment coil is inserted into a slot, expanded circumferentially on the stator core and viewed from the inner periphery to the outer periphery, and (b) is a diagram showing the state in which the segment coil is connected by welding, expanded circumferentially on the stator core and viewed from the inner periphery to the outer periphery. [Figure 8] FIG. 10 is a configuration diagram of a first component cuffer arranged in a stator core of a rotary electric machine according to a fifth embodiment of the present invention, as viewed in the axial direction. [Figure 9] 10 is a partial configuration diagram of a first cuff support disposed in a stator core of a rotary electric machine according to a sixth embodiment of the present invention, viewed in the axial direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings. Note that in each embodiment described below, the drawings have been appropriately simplified or modified to facilitate understanding, and the dimensional ratios and shapes of each part are not necessarily accurately depicted. Furthermore, in each embodiment, the description will focus on parts that differ from the preceding embodiment, and parts that are substantially common in function to the preceding embodiment will be assigned the same reference numerals and their description will be omitted as appropriate. [Example]

[0018] FIG. 1 is a perspective view illustrating a schematic configuration of a stator 10 of a rotating electric machine MG according to a first embodiment of the present invention. A first cuff support 30 and a second cuff support 40 (see FIG. 2), which will be described later, are not shown in FIG. 1. The insulating coating formed on the segment coil 60 (see FIG. 3) is also omitted. In FIG. 1 (and FIG. 2, which will be described later), the axis CL is shown extending vertically on the paper. However, when the rotating electric machine MG is mounted on a vehicle, for example, the axis CL is horizontal. Note that the horizontal direction in this state does not have to be strictly horizontal and may be inclined relative to the strictly horizontal direction; that is, the axis CL only needs to extend horizontally.

[0019] The rotating electric machine MG is a rotating electric machine that is mounted on, for example, a hybrid vehicle or an electric vehicle and functions as both an electric motor (motor) and a generator (electric power generator). The rotating electric machine MG is a driving source for the vehicle. The rotating electric machine MG includes a cylindrical stator 10 extending in the direction of an axis CL, and a rotor (not shown) disposed on the inner circumferential side of the stator 10. The rotor is rotatable by a rotating magnetic field generated by the stator 10.

[0020] The stator 10 includes a stator core 20 and a coil 50. In FIG. 1 , a single coil is wound across several slots 22, forming a distributed winding. The stator core 20 is made of a plurality of laminated electromagnetic steel sheets and has a cylindrical shape centered on the axis CL. Preferably, the stator core 20 is cylindrical, but its outer shape is not limited to a cylindrical shape and may be any cylindrical shape. Like the stator core 20, the coil 50 has an annular shape centered on the axis CL. Hereinafter, in this specification, the "direction parallel to the axis CL," the "circumferential direction of the stator core 20," and the "radial direction of the stator core 20" will be simply referred to as the "axis CL direction," the "circumferential direction," and the "radial direction," respectively. The cylindrical stator core 20 has an inner peripheral surface provided with a plurality of grooves, i.e., slots 22, which have a depth extending radially outward and penetrate in the direction of the axis CL, at equal angular intervals around the axis CL. Between adjacent slots 22, tooth portions 24 are formed at equal angular intervals around the axis CL. As will be described later, segment coils 60 (see FIG. 3) are inserted into the slots 22 and the plurality of segment coils 60 are connected together, thereby winding coils 50 (windings) around the tooth portions 24. The yoke 26 is a portion of the stator core 20 other than the tooth portions 24 and which serves as a path for magnetic field lines between the tooth portions 24 that have become electromagnets. Note that the stator core 20 is not necessarily limited to an electromagnetic steel plate, and may be one that is formed by molding magnetic powder, solid, or the like. The coil 50 is, for example, a three-phase winding of U-phase, V-phase, and W-phase.

[0021] 2 is a perspective view of the first cuff support 30 and the second cuff support 40 arranged on the stator core 20. FIG. 2 is a simplified view. Therefore, the equiangular intervals of the slots 22 arranged around the axis CL are larger than in FIG. 1. The first cuff support 30 and the second cuff support 40 are insulating members formed by, for example, resin molding.

[0022] The first cuff support 30 is an annular component located on the one end face 20a side of the stator core 20 in the direction of the axis CL. The first cuff support 30 includes an annular outer peripheral portion 32 that contacts the yoke 26 on the one end face 20a of the stator core 20, an annular inner peripheral portion 34 that contacts the inner circumferential tips of the tooth portions 24 of the stator core 20, and a plurality of connecting portions 36 that connect the outer peripheral portion 32 and the inner peripheral portion 34. The connecting portions 36 are provided corresponding to the positions of the tooth portions 24 and are arranged at equal angular intervals around the axis CL, similar to the tooth portions 24. The connecting portions 36 each contact the one end face 20a of the tooth portions 24. The side of the connecting portion 36 opposite to the side that contacts the tooth portions 24 protrudes outward in the direction of the axis CL beyond the one end face 20a and has, for example, a rectangular parallelepiped shape. The "outside" means the outside as viewed from the inside of the stator core 20. In this way, the connecting portions 36 are disposed on the one end face 20a side of the stator core 20, and protrude outward in the direction of the axis CL beyond the one end face 20a at positions corresponding to the positions of the tooth portions 24. Cuff slots 38 are formed between adjacent connecting portions 36 in the circumferential direction, and the cuff slots 38 correspond to the positions of the slots 22.

[0023] The second cuff support 40 is an annular component disposed on the other end face 20b side of the stator core 20 in the direction of the axis CL. The second cuff support 40 includes an annular outer peripheral portion 42 that contacts the yoke 26 on the other end face 20b of the stator core 20, an annular inner peripheral portion 44 that contacts the inner circumferential tips of the tooth portions 24 of the stator core 20, and a plurality of connecting portions 46 that connect the outer peripheral portion 42 and the inner peripheral portion 44. The connecting portions 46 are provided corresponding to the positions of the tooth portions 24, and are arranged at equal angular intervals around the axis CL, similar to the tooth portions 24. The connecting portions 46 are each in contact with the other end face 20b of the tooth portions 24. The opposite side of the connecting portions 46 that contacts the tooth portions 24 protrudes outward in the direction of the axis CL beyond the other end face 20b. Cuff slots 48 are formed between adjacent linking portions 46 in the circumferential direction, and the cuff slots 48 correspond to the positions of the slots 22 .

[0024] Figure 3 is a diagram explaining a method of winding a coil 50 around the stator core 20 shown in Figure 1, where (a) is a diagram showing the state in which a segment coil 60 is inserted into a slot 22, expanded circumferentially on the stator core 20 and viewed from the inner side to the outer side, and (b) is a diagram showing the state in which the segment coil 60 is connected by welding, expanded circumferentially on the stator core 20 and viewed from the inner side to the outer side.

[0025] The segment coil 60 inserted into the slot 22 is a so-called flat conductor with a rectangular cross section, such as a longitudinal conductor plate, with an insulating coating such as enamel formed on its surface. The segment coil 60 is bent into a roughly U-shape. The segment coil 60 has a first arm 62a and a second arm 62b that extend linearly in the same direction on the left and right sides of the U, and a connecting portion 64 that connects the base of the first arm 62a to the base of the second arm 62b. The insulating coating has been removed from the tip of the first arm 62a and the tip of the second arm 62b. Hereinafter, unless otherwise specified, the first arm 62a and the second arm 62b will be referred to as "arm portion 62."

[0026] As shown in FIG. 3(a), the multiple connecting portions 36 include three types of connecting portions: a first connecting portion 36a, a second connecting portion 36b, and a third connecting portion 36c, each with a different protruding shape. Hereinafter, unless otherwise specified, the first connecting portion 36a, the second connecting portion 36b, and the third connecting portion 36c will be referred to as the "connecting portion 36." The connecting portions 36 have the same circumferential width W0 [mm] and a contact portion with the coil 50 with a radius of curvature R0 [mm]. The first connecting portion 36a, the second connecting portion 36b, and the third connecting portion 36c have different lengths L1 [mm], L2 [mm], and L3 [mm] that protrude outward in the direction of the axis CL beyond the one end face 20a, respectively. The first component cuff support 30 has first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c arranged every third in the circumferential direction, and adjacent connecting portions 36 in the circumferential direction are of different types. The connecting portions 36 correspond to the "cuff support" in this invention.

[0027] First, as shown in FIG. 3(a), the arm portion 62 of the segment coil 60 is inserted into the slot 22. This brings the connecting portion 64 of the segment coil 60 into contact with the connecting portion 46 of the second component cuff support 40. The tip end side of the arm portion 62 of the segment coil 60 protrudes from one end face 20a of the stator core 20. FIG. 3(a) shows one of the inserted segment coils 60 as a representative. For example, multiple segment coils 60 (four in this embodiment) are inserted into each slot 22 and aligned radially.

[0028] Next, as shown in FIG. 3(b), the portion of the segment coil 60 protruding from the one end face 20a is bent in the circumferential direction of the stator core 20. When a force is applied to the arm portion 62 of the segment coil 60 to bend it in the circumferential direction, the arm portion 62 of the segment coil 60 is bent while being in contact with one of the multiple connecting portions 36. Each of the multiple connecting portions 36 serves as the starting point of bending when the arm portion 62 is bent in the circumferential direction. In other words, the portion of the arm portion 62 that contacts the connecting portion 36 is the point where the force acts. As described above, the first connecting portion 36a, the second connecting portion 36b, and the third connecting portion 36c each have different lengths that protrude outward from the one end face 20a in the direction of the axis CL. Therefore, the contact state of the segment coil 60 differs depending on the type of connecting portion 36 with which the segment coil 60 is in contact. In other words, the bent state of the portion of the segment coil 60 that contacts the connecting portion 36 differs depending on the type of connecting portion 36 with which the segment coil 60 is in contact. The "contact state" refers to, for example, the pressing force with which the coil 50 (=segment coil 60) presses the connecting portion 36, or the angle at which the arm portion 62 of the segment coil 60 is bent. This results in different circumferential rigidity in each segment coil 60. Furthermore, the coupling state between the segment coil 60 and the stator core 20 also differs depending on the contact state.

[0029] Then, the tip of the portion of one segment coil 60 that protrudes from one end face 20a is welded to the tip of the portion of another segment coil 60 that protrudes from one end face 20a, forming a weld 66. In this way, multiple segment coils 60 are electrically connected to each other by the weld 66, thereby forming a coil 50 that is wound around the tooth portion 24. The welding is, for example, TIG (Tungsten Inert Gas) welding. In the coil 50, the segment coils 60 that make up the coil 50 each have different circumferential rigidity, so the rigidity of the coil 50, which is annular as a whole (hereinafter referred to as "annular rigidity"), also becomes non-uniform in the circumferential direction.

[0030] The connecting portion 36 of the first component cuff 30 and the connecting portion 46 of the second component cuff 40 are used to fill the gap between the stator core 20 and the coil 50, respectively, to ensure insulation between the stator core 20 and the coil 50, and to prevent the coil 50 from lifting up from the stator core 20.

[0031] 3 conceptually illustrates a method for winding the coil 50, but in reality, for example, a plurality of segment coils 60 are inserted into the slots 22 in an annular shape and then welded together to form the annular coil 50. The coil 50 is pressed against one end surface 20a of the stator core 20 via the first component cuff support 30 and the second component cuff support 40. Therefore, the annular rigidity of the stator 10 is affected by the annular rigidity of the coil 50 as well as the annular rigidity of the stator core 20.

[0032] FIG. 4 is a diagram illustrating each step of a method for winding the coil 50 around the teeth 24 of the stator core 20 shown in FIG.

[0033] First, in step S10 (hereinafter, "step" will be omitted), the stator core 20 is placed with the first cuff support 30 and the second cuff support 40 attached, i.e., arranged, on the one end face 20a side and the other end face 20b side, respectively. After S10 is performed, in S20, the arm portions 62 of each segment coil 60, which are assembled in an annular shape, are inserted, for example, from the other end face 20b side of the stator core 20. As a result, the tip ends of the arm portions 62 of each segment coil 60 protrude from the one end face 20a of the stator core 20. After S20 is performed, in S30, the portions of each segment coil 60 protruding from the one end face 20a are bent in the circumferential direction. After S30 is performed, in S40, the tip ends of the arm portions 62 of the segment coils 60 are welded together. This forms the coil 50 wound around the tooth portion 24. Then, the process ends.

[0034] According to this embodiment, three types of first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c, which have different contact states with the coil 50, are arranged in the circumferential direction. The three types of first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c have different lengths of protrusion outward in the direction of the axis CL from the one end face 20a. Furthermore, connecting portions 36 adjacent to each other in the circumferential direction are different types of the three types of first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c, which have different contact states with the coil 50. As a result, the bending states of the portions of the coil 50 in contact with the first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c vary in the circumferential direction. Therefore, the ring rigidity of the coil 50 is non-uniform in the circumferential direction compared to when only connecting portions of the same type that have the same contact state with the coil 50 are provided. Since the annular rigidity of coil 50 is non-uniform, the annular rigidity of stator 10 is also non-uniform, thereby suppressing resonance of stator 10. Resonance of stator 10 includes, for example, circumferential resonance, radial resonance, twisting resonance between one end face 20a and the other end face 20b, and resonance in which one end face 20a deviates from axis CL when the other end face 20b is fixed to a non-rotating member and one end face 20a is not fixed. [Example]

[0035] 5 is a diagram illustrating a method of winding a coil 50 around a stator core 20 of a rotating electric machine MG according to a second embodiment of the present invention, and is a diagram showing a state in which segment coils 60 are connected by welding, expanded in the circumferential direction of the stator core 20 and viewed from the inner circumferential side to the outer circumferential side. FIG. 5 corresponds to FIG. 3(b) in the first embodiment described above. This embodiment has substantially the same configuration as the stator 10 according to the first embodiment, except that a first component cuff support 130 is used instead of the first component cuff support 30.

[0036] The first component cuff support 130 has a plurality of connecting portions 136 instead of the plurality of connecting portions 36 of the first component cuff support 30. The connecting portions 136 are provided corresponding to the positions of the tooth portions 24. The connecting portions 136 have, for example, a rectangular parallelepiped shape, with the side of the connecting portion 136 opposite to the side that contacts the tooth portions 24 protruding outward in the direction of the axis CL beyond the one end face 20a.

[0037] As shown in FIG. 5, the multiple connecting portions 136 include three types of connecting portions: a first connecting portion 136a, a second connecting portion 136b, and a third connecting portion 136c, each with a different protruding shape. Hereinafter, unless otherwise specified, the first connecting portion 136a, the second connecting portion 136b, and the third connecting portion 136c will be referred to as the "connecting portion 136." The connecting portions 136 have the same length L0 [mm] of the portion that protrudes outward in the direction of the axis CL from the one end face 20a, and the same radius of curvature R0 [mm] of the contact portion with the coil 50. The first connecting portion 136a, the second connecting portion 136b, and the third connecting portion 136c have different circumferential widths W1 [mm], W2 [mm], and W3 [mm], respectively. The first component cuff support 130 has first connecting portions 136a, second connecting portions 136b, and third connecting portions 136c arranged every third in the circumferential direction, and adjacent connecting portions 136 in the circumferential direction are of different types. The connecting portions 136 correspond to the "cuff support" in this invention.

[0038] Since the first connecting portion 136a, the second connecting portion 136b, and the third connecting portion 136c have different circumferential widths, the contact state differs depending on the type of connecting portion 136 with which the segment coil 60 is in contact. In other words, depending on the type of connecting portion 136 with which the segment coil 60 is in contact, the bent state of the portion of the segment coil 60 that is in contact with the connecting portion 136 differs.

[0039] According to this embodiment, three types of first connecting portions 136a, second connecting portions 136b, and third connecting portions 136c, which have different contact states with the coil 50, are arranged in the circumferential direction, and the three types of first connecting portions 136a, second connecting portions 136b, and third connecting portions 136c have different circumferential widths. Furthermore, connecting portions 136 arranged adjacent to each other in the circumferential direction are different types of the three types of first connecting portions 136a, second connecting portions 136b, and third connecting portions 136c, which have different contact states with the coil 50. As a result, the bending states of the respective portions of the coil 50 in contact with the first connecting portions 136a, second connecting portions 136b, and third connecting portions 136c differ in the circumferential direction. Therefore, the ring rigidity of the coil 50 is non-uniform in the circumferential direction compared to when only connecting portions of the same type that have the same contact state with the coil 50 are provided. Since the ring stiffness of the coil 50 is non-uniform, the ring stiffness of the stator 10 is also non-uniform, and resonance of the stator 10 is suppressed. [Example]

[0040] 6 is a diagram illustrating a method of winding a coil 50 around a stator core 20 of a rotating electric machine MG according to a third embodiment of the present invention, and is a diagram showing a state in which segment coils 60 are connected by welding, expanded in the circumferential direction of the stator core 20 and viewed from the inner circumferential side to the outer circumferential side. FIG. 6 corresponds to FIG. 3(b) in the first embodiment described above. This embodiment has substantially the same configuration as the stator 10 according to the first embodiment, except that a first component cuff support 230 is used instead of the first component cuff support 30.

[0041] The first component cuff support 230 has a plurality of connecting portions 236 instead of the plurality of connecting portions 36 of the first component cuff support 30. The connecting portions 236 are provided corresponding to the positions of the tooth portions 24. The connecting portions 236 have, for example, a rectangular parallelepiped shape, with the side of the connecting portion 236 opposite to the side that contacts the tooth portions 24 protruding outward in the direction of the axis CL beyond the one end face 20a.

[0042] As shown in FIG. 6, the multiple connecting portions 236 include three types of connecting portions: a first connecting portion 236a, a second connecting portion 236b, and a third connecting portion 236c, each having a different protruding shape. Hereinafter, unless otherwise specified, the first connecting portion 236a, the second connecting portion 236b, and the third connecting portion 236c will be referred to as the "connecting portion 236." The connecting portion 236 protrudes outward from the one end face 20a in the axis CL direction by a length L0 and has a circumferential width W0. That is, the connecting portions 236 have the same length protruding outward from the one end face 20a in the axis CL direction and the same circumferential width. The first connecting portion 236a, the second connecting portion 236b, and the third connecting portion 236c have different curvature radii R1 [mm], R2 [mm], and R3 [mm] at their contact portions with the coil 50, respectively. The first component cuff support 230 has first connecting portions 236a, second connecting portions 236b, and third connecting portions 236c arranged every third in the circumferential direction, and adjacent connecting portions 236 in the circumferential direction are of different types. The connecting portions 236 correspond to the "cuff support" in this invention.

[0043] The first connecting portion 236a, the second connecting portion 236b, and the third connecting portion 236c each have a different radius of curvature at the contact portion with the coil 50, and therefore the contact state differs depending on the type of connecting portion 236 with which the segment coil 60 is in contact. In other words, depending on the type of connecting portion 236 with which the segment coil 60 is in contact, the portion where the segment coil 60 is in contact with the connecting portion 236 has a different bent state.

[0044] According to this embodiment, three types of first connecting portions 236a, second connecting portions 236b, and third connecting portions 236c, which have different contact states with the coil 50, are arranged in the circumferential direction, and the three types of first connecting portions 236a, second connecting portions 236b, and third connecting portions 236c have different radii of curvature at the contact portions with the coil 50. Furthermore, connecting portions 236 arranged adjacently in the circumferential direction are different types of the three types of first connecting portions 236a, second connecting portions 236b, and third connecting portions 236c, which have different contact states with the coil 50. As a result, the bending states of the respective portions of the coil 50 in contact with the first connecting portions 236a, second connecting portions 236b, and third connecting portions 236c differ in the circumferential direction. Therefore, the ring rigidity of the coil 50 is non-uniform in the circumferential direction compared to when only connecting portions of the same type that have the same contact state with the coil 50 are provided. Since the ring stiffness of the coil 50 is non-uniform, the ring stiffness of the stator 10 is also non-uniform, and resonance of the stator 10 is suppressed. [Example]

[0045] 7A and 7B are diagrams illustrating a method of winding a coil 50 around a stator core 20 of a rotating electric machine MG according to a fourth embodiment of the present invention, in which (a) is a diagram of the stator core 20 with a segment coil 60 inserted into a slot 22, viewed from the inner periphery to the outer periphery, and (b) is a diagram of the stator core 20 with a segment coil 60 connected by welding, viewed from the inner periphery to the outer periphery, and shown in FIG. 7A and FIG. 7B correspond to FIG. 3 in the first embodiment. This embodiment has substantially the same configuration as the stator 10 according to the first embodiment, except that a first component cuff 330 is used instead of the first component cuff 30.

[0046] The first component cuff support 330 has a plurality of connecting portions 336 instead of the plurality of connecting portions 36 of the first component cuff support 30. The connecting portions 336 are provided corresponding to the positions of the tooth portions 24. The connecting portions 336 have, for example, a rectangular parallelepiped shape, with the side of the connecting portion 336 opposite to the side that contacts the tooth portions 24 protruding outward in the direction of the axis CL beyond the one end face 20a.

[0047] As shown in FIG. 7(a), the multiple connecting portions 336 include three types of connecting portions: a first connecting portion 336a, a second connecting portion 336b, and a third connecting portion 336c, each with a different protruding shape. Hereinafter, unless otherwise specified, the first connecting portion 336a, the second connecting portion 336b, and the third connecting portion 336c will be referred to as the "connecting portion 336." The connecting portions 336 have the same length L0 of the portion protruding outward from the one end face 20a in the direction of the axis CL, the same width W0 in the circumferential direction, and the same radius of curvature R0 of the contact portion with the coil 50. The first connecting portion 336a, the second connecting portion 336b, and the third connecting portion 336c each have different circumferential flexibility. For example, the second connecting portion 336b and the third connecting portion 336c are provided with one and two grooves, i.e., slits 336s, respectively, that have a depth in the direction of the axis CL and penetrate radially, while the first connecting portion 336a is not provided with any slits 336s. The first component cuff support 330 has first connecting portions 336a, second connecting portions 336b, and third connecting portions 336c arranged every three in the circumferential direction, and adjacent connecting portions 336 in the circumferential direction are of different types. The connecting portions 336 correspond to the "cuff support" in this invention.

[0048] Since the first connecting portion 336a, the second connecting portion 336b, and the third connecting portion 336c have different circumferential flexibilities, as shown in Fig. 7(b), the contact state of the segment coil 60 differs depending on the type of connecting portion 336 with which the segment coil 60 is in contact. That is, depending on the type of connecting portion 336 with which the segment coil 60 is in contact, the portion where the segment coil 60 is in contact with the connecting portion 336 has a different bent state.

[0049] According to this embodiment, three types of first connecting portions 336a, second connecting portions 336b, and third connecting portions 336c, which have different contact states with the coil 50, are arranged in the circumferential direction, and the three types of first connecting portions 336a, second connecting portions 336b, and third connecting portions 336c have different circumferential flexibility. Furthermore, connecting portions 336 arranged adjacent to each other in the circumferential direction are different types of the three types of first connecting portions 336a, second connecting portions 336b, and third connecting portions 336c, which have different contact states with the coil 50. As a result, the bending states of the respective portions of the coil 50 in contact with the first connecting portions 336a, second connecting portions 336b, and third connecting portions 336c differ in the circumferential direction. Therefore, the ring rigidity of the coil 50 is non-uniform in the circumferential direction compared to when only connecting portions of the same type that have the same contact state with the coil 50 are provided. Since the ring stiffness of the coil 50 is non-uniform, the ring stiffness of the stator 10 is also non-uniform, and resonance of the stator 10 is suppressed. [Example]

[0050] 8 is a configuration diagram of a first cuff support 430 arranged in a stator core 20 of a rotating electric machine MG according to a fifth embodiment of the present invention, viewed in the direction of the axis CL. This embodiment is substantially the same as the configuration of the stator 10 according to the first embodiment, except that the first cuff support 30 is replaced with a first cuff support 430.

[0051] In the first component cuff support 30 described above, the first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c were arranged every third in the circumferential direction. When viewed in the direction of the axis CL, in the first component cuff support 430, different types of connecting portions 36 are arranged at positions that are point-symmetric about the axis CL. For example, if the first component cuff support 430 is divided into first to sixth regions at equal angular intervals of 2π / 6 rad around the axis CL, different types of first connecting portions 36a and second connecting portions 36b are arranged in the first and fourth regions, which are point-symmetric about the axis CL. Similarly, different types of third connecting portions 36c and second connecting portions 36b are arranged in the second and fifth regions, which are point-symmetric about the axis CL. Furthermore, different types of first connecting portions 36a and third connecting portions 36c are arranged in the third and sixth regions, which are positioned point-symmetrically about the axis CL. The connecting portions 36 correspond to the "cuffs" of the present invention.

[0052] According to this embodiment, different types of first connecting portions 36a, second connecting portions 36b, and third connecting portions 36c, which are three types having different contact states with coil 50, are arranged at positions point-symmetrical about axis CL. When different types of connecting portions 36 are arranged at positions point-symmetrical about axis CL, the ring stiffness of coil 50 is non-uniform at the positions point-symmetrical about axis CL compared to when this is not the case, and therefore the ring stiffness of stator 10 also becomes non-uniform, thereby suppressing resonance of stator 10. [Example]

[0053] 9 is a partial configuration diagram of a first cuff support 530 arranged in a stator core 20 of a rotating electric machine MG according to a sixth embodiment of the present invention, viewed in the direction of the axis CL. This embodiment is substantially the same as the configuration of the stator 10 according to the first embodiment, except that the first cuff support 30 is replaced with a first cuff support 530.

[0054] The first component cuff support 530 includes a plurality of connecting portions 536 connecting the outer circumferential portion 32 and the inner circumferential portion 34. The connecting portions 536 are provided corresponding to the positions of the tooth portions 24 and are arranged at equal angular intervals around the axis CL, similar to the tooth portions 24. The connecting portions 536 are in contact with one end face 20a of the tooth portions 24. The side of each connecting portion 536 opposite to the side in contact with the tooth portions 24 protrudes outward in the direction of the axis CL beyond the one end face 20a. Each connecting portion 536 includes two types of first shaped portions 538a and two types of second shaped portions 538b. The connecting portions 536 have two types of first shaped portions 538a and two types of second shaped portions 538b arranged alternately in the radial direction from the inner circumferential side to the outer circumferential side. The first and second shaped portions 538a and 538b have different lengths L1 and L2, respectively, that protrude outward from the end face 20a in the direction of the axis CL. For example, each is rectangular. Hereinafter, unless otherwise specified, the first and second shaped portions 538a and 538b will be referred to as "shaped portions 538." The shaped portions 538 each have a circumferential width W0, a contact portion with the coil 50 having a curvature radius R0, and the same circumferential flexibility. Thus, the shaped portions 538 are disposed on the end face 20a side of the stator core 20 and protrude outward from the end face 20a in the direction of the axis CL at positions corresponding to the positions of the tooth portions 24. A cuff sash slot 38 is formed between adjacent connecting portions 536 in the circumferential direction, and the cuff sash slot 38 corresponds to the position of the slot 22.

[0055] The first shaped portion 538a and the second shaped portion 538b in the connecting portion 536 have different lengths that protrude outward in the direction of the axis CL from the one end face 20a, and therefore the contact state differs depending on the type of shaped portion 538 with which the segment coil 60 is in contact. That is, depending on the type of shaped portion 538 with which the segment coil 60 is in contact, the portion where the segment coil 60 is in contact with the shaped portion 538 has a different bent state. The shaped portion 538 corresponds to the "cuffs" in this invention.

[0056] According to this embodiment, (a) two types of first shaped portions 538a and second shaped portions 538b having different contact states with the coil 50 are arranged alternately in the radial direction, and (b) the two types of first shaped portions 538a and second shaped portions 538b have different lengths of protrusion outward in the direction of the axis CL from the one end surface 20a. Furthermore, the shaped portions 538 adjacent in the radial direction are different types of the two types of first shaped portions 538a and second shaped portions 538b having different contact states with the coil 50. As a result, the bending states of the respective portions of the coil 50 in contact with the first shaped portions 538a and second shaped portions 538b are different in the radial direction. Therefore, the ring rigidity of the coil 50 is non-uniform in the radial direction compared to when only shaped portions having the same type of contact state with the coil 50 are provided. Since the ring stiffness of the coil 50 is non-uniform, the ring stiffness of the stator 10 is also non-uniform, and resonance of the stator 10 is suppressed.

[0057] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the present invention can also be applied to other embodiments.

[0058] In the fourth embodiment described above, the first connecting portion 336a, the second connecting portion 336b, and the third connecting portion 336c have different circumferential flexibility due to the presence or absence of slits 336s and the number of slits 336s. However, the present invention is not limited to this. As long as the circumferential flexibility is different, other embodiments may be used, such as by using different materials for each connecting portion.

[0059] In the above-described first to fourth embodiments, the first cuff support 30, 130, 230, and 330 have three different types of connecting portions regularly arranged every third connecting portion in the circumferential direction, and adjacent connecting portions in the circumferential direction are of different types. However, the present invention is not limited to this. For example, the three different types of connecting portions may be arranged randomly in the circumferential direction, or some adjacent connecting portions in the circumferential direction may be of the same type. Essentially, the three different types of connecting portions may be arranged so that the ring rigidity of the coil 50 is non-uniform compared to when the same type of connecting portions are arranged in the circumferential direction. Furthermore, although the first cuff support 30, 130, 230, and 330 each have three types of connecting portions arranged in the circumferential direction, four or more types of connecting portions may be arranged.

[0060] In the sixth embodiment described above, the first cuff support 530 includes two types of first and second shaped portions 538a and 538b, which have different contact states with the coil 50, arranged alternately and regularly in the radial direction, with adjacent shaped portions of different types in the radial direction. However, the present invention is not limited to this. For example, two different shaped portions may be arranged randomly in the radial direction, or some adjacent shaped portions in the radial direction may be of the same type. Essentially, the arrangement may be such that the annular rigidity of the coil 50 is non-uniform compared to when shaped portions of the same type are arranged in the radial direction. Furthermore, the first cuff support 530 includes a connecting portion 536 including two types of first shaped portions 538a and two types of second shaped portions 538b in the radial direction. However, a connecting portion including three or more types of shaped portions may be arranged.

[0061] In the above-described first to fourth embodiments, the first cuff supports 30, 130, 230, and 330 have connecting portions that differ in one of the length protruding outward from the one end face 20a in the direction of the axis CL, the circumferential width, the radius of curvature of the contact portion with the coil 50, and the circumferential flexibility. However, for example, the first cuff supports 30, 130, 230, and 330 may have connecting portions that differ in at least one of the length protruding outward from the one end face 20a in the direction of the axis CL, the circumferential width, the radius of curvature of the contact portion with the coil 50, and the circumferential flexibility. That is, the first cuff supports 30, 130, 230, and 330 may have connecting portions that differ in at least one of the length protruding outward from the one end face 20a in the direction of the axis CL, the circumferential width, the radius of curvature of the contact portion with the coil 50, and the circumferential flexibility.

[0062] In the above-described first to fifth embodiments, the first cuff support 30, 130, 230, 330, and 430 have different types of connecting portions in the circumferential direction, and in the above-described sixth embodiment, the first cuff support 530 has different types of shaped portions in the radial direction, but the present invention may have different types of connecting portions or shaped portions in both the circumferential direction and the radial direction. That is, it is sufficient that the first cuff support 30, 130, 230, 330, 430, and 530 have different types of "cuff support" according to the present invention in at least one of the circumferential direction and the radial direction.

[0063] In the above-described first to sixth embodiments, the coil 50 is a distributed winding, but the present invention is also applicable to a stator 10 in which the coil 50 is a concentrated winding.

[0064] In the above-described first to sixth embodiments, the rotating electric machine MG is a motor generator that is a drive source for running the vehicle, but the present invention is not limited to this. For example, the rotating electric machine MG may be a vehicle-driving electric motor that has only a motor function and no generator function, or a regenerative electric generator that has only a generator function and no motor function.

[0065] It should be noted that the above is merely an example of the present invention, and the present invention can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art, without departing from the spirit of the present invention. [Explanation of symbols]

[0066] 10: Stator 20: Stator core 20a: One end surface 22: Slot 24: Teeth 36, 136, 236, 336: Connection part (Cafsa) 538: Shape part (Cuffa) 50: Coil CL: Axis line L0~L3: Length MG: Rotating electric machine R0~R3: Radius of curvature W0~W3: Width

Claims

1. a cylindrical stator core centered on an axis; a plurality of cuffs disposed on one end surface of the stator core in the axial direction and protruding outward in the axial direction from the one end surface at positions corresponding to the teeth of the stator core, respectively; a coil inserted into a slot of the stator core, bent in a circumferential direction of the stator core on an outer side of the one end face in the axial direction, and in contact with each of the cuffs; A stator for a rotating electric machine, comprising: Three or more types of cuffs, each having a different contact state with the coil depending on at least one of the circumferential width of the stator core, the radius of curvature of the contact portion with the coil, and the circumferential flexibility of the stator core, are arranged in the circumferential direction of the stator core. A stator for a rotating electric machine characterized by:

2. Three or more types of cuffs having different contact states with the coil are arranged in the circumferential direction of the stator core, The cuffs adjacent to each other in the circumferential direction of the stator core are of different types among the three or more different types.

2. The stator of claim 1, wherein the stator is a stator for a rotating electrical machine.

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