JP2017050966A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stably wound coil while suppressing a height of a coil end in a rotary electric machine stator.SOLUTION: A rotary electric machine stator 10 comprises: a stator core 12; an annular coil holding plate 30 including coil passing holes 34 as many as a plurality of slots 24 of the stator core and holding parts 32 as many as a plurality of teeth 22 and disposed on an end face of the stator core 12 in an axial direction in the state where the corresponding coil passing holes 34 and slots 24 are aligned; and a coil which pass the coil passing holes 34 and the slots 24 and is wound around the holding parts 32 and the teeth 22. The holding part 32 of the coil holding plate 30 includes: a center holding part 36 in a central part in a radial direction; an outer diameter side protrusion 40 which protrudes from the center holding part 36 at an outer diameter side; and an inner diameter side protrusion 42 which protrudes from the center holding part 36 at an inner diameter side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine stator, and more particularly to a rotating electrical machine stator in which a coil is wound around a stator core.

  In order to wind the coil around the stator core of the rotating electrical machine stator, the coil is bent at the coil end where the coil protrudes toward the axial end surface of the stator core.

  Patent Document 1 discloses a configuration in which a resin ring-shaped end plate is disposed on a tooth in order to suppress damage due to bending of the coil at the coil end on the lead side of the coil of the stator core. In this end plate, the same number of holes as the slots of the stator core are formed at equal intervals, and the radial and circumferential lengths of the holes are slightly shorter than the radial and circumferential lengths of the slots.

  In Patent Document 2, in a structure in which a segment coil is wound around a stator core of a rotating electrical machine, the outermost segment coil is shifted to the outer diameter side at the coil end on the non-lead side, and the innermost diameter side is shifted. A structure for shifting the segment coil to the inner diameter side is described as the prior art. Thereby, the height of the coil end is reduced.

JP 2007-31549 A JP 2014-036560 A

  In order to suppress the height of the coil end, if a structure in which the outermost diameter side or innermost diameter side coil is shifted radially outward is used, the shifted portion is in a state of floating from the end surface of the stator core. It becomes a winding. Accordingly, there is a demand for a rotating electrical machine stator having a coil wound stably while suppressing the height of the coil end.

  A rotating electrical machine stator according to one aspect of the present invention includes an annular stator yoke, a plurality of teeth protruding from the stator yoke to the inner diameter side, and a stator core having a plurality of slots that are spaces between adjacent teeth, and a stator core The same number of coil through holes as the plurality of slots, and the same number of holding portions as the plurality of teeth, and an annular shape disposed on the axial end surface of the stator core with the corresponding coil through holes and slots aligned. A coil holding plate, a coil that passes through the coil through hole and the slot, and is wound around the holding portion and the teeth. The coil has an outermost diameter side coil and an innermost diameter side coil at the transition portion at the coil end. Compared to other coils, it protrudes in the axial direction, the outermost diameter side coil is shifted to the outer diameter side, and the innermost diameter side coil is shifted to the inner diameter side. The holding part of the coil holding plate includes a central holding part in the central part in the radial direction, an outer diameter side protrusion part protruding from the central holding part on the outer diameter side corresponding to the outermost diameter side coil, and an innermost diameter side coil. And an inner diameter side protrusion that protrudes from the center holding portion on the corresponding inner diameter side.

  According to the rotating electrical machine stator having the above-described configuration, a coil wound stably can be obtained while suppressing the height of the coil end.

It is an exploded view of the rotary electric machine stator of embodiment which concerns on this invention. FIG. 1A is a view showing a stator core, FIG. 1B is a view showing a coil holding plate, and FIG. 1C is a view showing a segment coil. In a distributed winding, it is a figure which shows shifting the segment coil of the outermost diameter side to the outer diameter side, and shifting the segment coil of the innermost diameter side to the inner diameter side. It is a figure which shows the transition part of the segment coil of FIG. 2 in the coil end of the state which does not use a coil holding plate. It is an enlarged view of the coil holding plate in the rotary electric machine stator of embodiment which concerns on this invention. It is a figure corresponding to FIG. 3 when using the coil holding plate in the rotary electric machine stator of embodiment which concerns on this invention. It is a figure corresponding to Drawing 5 when using a coil holding plate which does not have an outside diameter side projection part and an inside diameter side projection part as a comparative example.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Below, although the stator used for the rotary electric machine mounted in a vehicle is described, this is an illustration for description and may be used for purposes other than mounting on a vehicle. In the following, a coil wound with a single layer using a rectangular wire will be described as a coil, but this is an example for explanation, and a round wire other than a rectangular wire, a winding with an elliptical cross section, etc. may be used. . Moreover, multiple turns may be sufficient. As a winding method, distributed winding is described, but concentrated winding may be used.

  Hereinafter, a coil holding plate provided on the non-lead side will be described with the side where the power line is drawn from the coil among the coil ends in the stator as the lead side. This is an illustrative example, and when a coil that shifts in the radial direction on the innermost diameter side or outermost diameter side on the lead side is used, a coil holding plate can be provided on the lead side. A coil holding plate may be provided on both the non-lead side and the lead side. Although the coil is described as being formed using a segment coil, the coil may be formed by winding a continuous conducting wire.

  The shape, dimensions, the number of teeth, the number of magnetic poles, the number of turns, the material, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the rotating electric machine stator. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is an exploded view of a rotating electrical machine stator 10 used in a rotating electrical machine mounted on a vehicle. Hereinafter, unless otherwise specified, the rotating electrical machine stator 10 is referred to as a stator 10. The rotating electrical machine in which the stator 10 is used is a three-phase synchronous rotating electrical machine that functions as an electric motor when the vehicle is powered by the control of the drive circuit and functions as a generator when the vehicle is braking. is there. The rotating electrical machine includes a stator 10 in which the elements shown in FIG. 1 are assembled, and an annular rotor disposed on the inner diameter side of the stator 10 with a predetermined gap therebetween. In FIG. 1, the illustration of the rotor is omitted.

  The stator 10 includes a stator core 12, a coil holding plate 30, and a coil 14 (see FIG. 2) attached to the stator core 12 and the coil holding plate 30. In the three-phase synchronous rotating electric machine, the coil 14 includes a U-phase coil, a V-phase coil, and a W-phase coil. Each phase coil is formed by bending a plurality of segment coils 50 according to a predetermined winding method and connecting them together. An example of forming each phase coil using the segment coil 50 will be described later.

  FIG. 1 is a diagram in which the stator 10 is disassembled into a stator core 12, a coil holding plate 30 and a coil 14, and the coil 14 is further disassembled into a segment coil 50.

  In FIG. 1, the axial direction, radial direction, and circumferential direction are shown for each element. The axial direction is the direction in which the annular central axis of the stator core 12 extends, and the side from which the power line is drawn from the coil 14 is the lead side, and the opposite direction is the anti-lead side. The radial direction is an annular radial direction of the stator core 12 and extends from the inner diameter side to the outer diameter side. The circumferential direction is an annular circumferential direction of the stator core 12 and is a clockwise direction and a counterclockwise direction when the lead side is viewed from the anti-lead side. The same applies to the following figures.

  The stator core 12 is an annular magnetic part, and includes an annular stator yoke 20 and a plurality of teeth 22 protruding from the stator yoke 20 toward the inner diameter side. A space between adjacent teeth 22 is a slot 24. The teeth 22 are projecting portions to which the coils 14 are attached and serve as magnetic poles.

  The stator core 12 includes a stator yoke 20 and teeth 22 and is used by laminating a plurality of annular magnetic thin plates 28 formed in a predetermined shape so that a slot 24 is formed. Both surfaces of the magnetic thin plate 28 are electrically insulated. As a material of the magnetic thin plate 28, an electromagnetic steel plate can be used. Instead of the laminated body of the magnetic thin plates 28, the magnetic powder may be integrally formed into a predetermined shape.

  The coil holding plate 30 is a member used for facilitating bending or the like while preventing damage when the segment coil 50 is inserted into the slot 24 of the stator core 12 and then bent to form the coil 14. .

  The coil holding plate 30 is an annular member having the same number of holding portions 32 as the plurality of teeth 22 of the stator core 12, and the same number of coil through holes 34 as the plurality of slots 24. The coil holding plate 30 is disposed on the axial end surface of the stator core 12 by aligning the corresponding coil through holes 34 with respect to the slots 24 of the stator core 12. In the example of FIG. 1, it is disposed on the end surface in the axial direction on the opposite lead side. The alignment may be performed between each tooth 22 of the stator core 12 and each holding portion 32 corresponding thereto.

  Each holding portion 32 of the coil holding plate 30 includes a central holding portion 36 in the central portion in the radial direction, an outer diameter side protruding portion 40 that protrudes from the central holding portion 36 on the outer diameter side, and a central holding portion 36 on the inner diameter side. It has the inner diameter side protrusion part 42 which protrudes more. The plurality of outer diameter side projections 40 are connected to each other by an outer diameter side connection portion 44 to form the outer peripheral portion of the coil holding plate 30, and the plurality of inner diameter side projection portions 42 are connected to each other by an inner diameter side connection portion 46. The inner peripheral part of the coil holding plate 30 is formed. Details of the coil holding plate 30 will be described later.

  The coil holding plate 30 is formed into a predetermined shape using a resin. As the resin, a material having electrical insulation and appropriate strength and heat resistance is used. For example, an epoxy resin, a polyimide resin, an aromatic nylon resin compound, or the like is used. A suitable filler may be included in the resin.

  The coil 14 is composed of a U-phase coil, a V-phase coil, and a W-phase coil. Each phase coil has a plurality of unit coils wound in the circumferential direction of the stator core 12 and the coil holding plate 30, with a plurality of unit coils wound over (six-slot interval) = (six-seat passage interval). Are connected in series. In the three-phase synchronous rotating electrical machine, each phase coil is arranged at (3 slot interval) = (3 coil passing interval), so (6 slot interval) = (6 coil passing interval) is used for the same phase. Two each phase coils are formed. Two phase coils of the same phase are connected in parallel to each other and used as one phase coil.

  In FIG. 1, with respect to the stator core 12, the coil holding plate 30, and the segment coil 50, one unit of (6 slot interval) = (6 coil passage interval) is illustrated, and the other portions are appropriately omitted. In order to distinguish the seven slots 24 constituting (six-slot spacing) = (six-slot coil spacing) from the seven corresponding coil-passing holes 34, U1, U2, V1, V2, W1, W2 and U1 are attached. U1 and U2 indicate the slot 24 and the coil through hole 34 through which the U1 coil and the U2 coil constituting one U-phase coil are passed. Similarly, V1 and V2 indicate the slot 24 and the coil through hole 34 through which the V1 coil and V2 coil constituting one V-phase coil are passed, and W1 and W2 are W1 coils constituting one W-phase coil. And the slot 24 and the coil through hole 34 through which the W2 coil is passed.

  Each phase coil is formed using a plurality of segment coils 50. FIG. 1 shows five segment coils 50 used to form one unit coil of the U1 coil. The segment coil 50 is formed by bending a conductor wire with an insulating film having a predetermined length into a substantially U shape so that tip portions on both sides thereof are separated by a predetermined slot interval and become parallel. The leg portions 52 and 54 on both sides of the substantially U shape are respectively inserted into the slot 24 and the coil through hole 34, and the crossing portion 56 between the leg portions 52 and 54 on both sides serves as the coil end on the opposite lead side of the stator 10. Form.

  A copper wire, a copper-tin alloy wire, a silver-plated copper-tin alloy wire, or the like can be used as the strand of the conductor wire with an insulating film of the segment coil 50. As the strand, a rectangular wire having a substantially rectangular cross section is used. As the insulating film, a polyamide-imide enamel film is used. Instead of this, polyesterimide, polyimide, polyester, formal and the like can be used.

The insertion destinations of the leg portions 52 and 54 of the five segment coils 50 are the coil passage hole 34 and the slot 24 of U1. The coil passage hole 34 and slot 24 of U1 into which the leg portion 52 is inserted and the coil passage hole 34 and slot 24 of U1 into which the leg portion 54 is inserted are mutually (six-slot spacing) = (six-coil passage spacing). is seperated. The five segment coils 50 are distinguished from each other and are referred to as segment coils 50 ₁ , 50 ₂ , 50 ₃ , 50 ₄ , and 50 ₅ from the outer diameter side to the inner diameter side of the coil through hole 34 and the slot 24 of U1. Correspondingly, to distinguish 5 legs 52, 52 _1, 52 _2, 52 _3, 52 _4, 52 ₅ and then, to distinguish five legs 54, 54 _1, 54 _2, 54 _3, 54 _4, 54 and _5, to distinguish five connecting portions 56, and 56 _1, 56 _2, 56 _3, 56 _4, 56 _5.

FIG. 2 is a top view of the stator core 12 as viewed from the opposite lead side with the coil holding plate 30 omitted, and the portions of the seven slots 24 shown as (U1, U2, V1, V2, W1, W2, U1) in FIG. Indicates. When distinguishing the two slots 24 of U1 of the seven slots 24, the slot most clockwise along the peripheral direction with a slot 24 _L, the most slot in the counterclockwise direction as the slot 24 _R. The five segment coils 50 are bent and connected by a predetermined winding method across the slot 24 _L and the slot 24 _R to form one unit coil of the U1 coil constituting the coil 14.

The legs of eight segment coils 50 are inserted into the slots 24 _L and 24 _R , respectively. Five of the eight are legs 52 and 54 of the segment coils 50 ₁ , 50 ₂ , 50 ₃ , 50 ₄ , and 50 ₅ , and the rest are the legs of the segment coil 50 of the other unit coil of the U1 coil. . The insulator 16 is an insulator for improving the electrical insulation between the stator core 12 and the segment coil 50. The insulator 16 is formed by molding a paper or plastic film, which is a sheet having electrical insulation, into a predetermined shape.

In the slot 24 _L , the leg portion 52 ₁ of the segment coil 50 ₁ is inserted on the outermost diameter side, and the leg portion 52 ₂ of the segment coil 50 ₂ is inserted immediately on the inner diameter side thereof. While sandwiching the legs of the other segment coil 50 during therefrom toward the inner diameter side, the segment coil 50 ₃ of the leg portions 52 _3, segment coil 50 ₄ of the leg portion 52 _4, the legs 52 ₅ segment coil 50 ₅ There is inserted, the legs 52 ₅ becomes innermost side.

The slot 24 _R is legs 54 ₁ segment coil 50 ₁ is inserted into the outermost diameter side. While sandwiching the legs of the other segment coil 50 during therefrom toward the inner diameter side, the segment coil 50 _second leg 54 _2, the segment coil 50 ₃ of the leg _543, the leg portion 54 ₄ of the segment coil 50 ₄ Is placed. Legs 54 ₅ segment coil 50 ₅ is inserted immediately radially inner side of the leg portion 54 _4, which is the innermost side.

Legs 52 ₂ , 52 ₃ , 52 ₄ , and _{5 25} protrude from the slot 24 _L on the lead side. These are bent counterclockwise along the circumferential direction. On the other hand, the lead side of the slot 24 _R is legs 54 _1, 54 _2, 54 _3, 54 ₄ protrudes. These are bent clockwise along the circumferential direction. The four legs 52 bent in the counterclockwise direction and the four legs 54 bent in the clockwise direction are welded at the four connection points P ₁₂ , P ₂₃ , P ₃₄ , and P ₄₅ shown in FIG. Connected by Thus, folded in a predetermined manner the legs 52, 54 of each segment coil 50, by connecting, across the slot 24 _L and the slot 24 _R, 5 volumes unit coil of formed.

According to this arrangement, as indicated by thick solid lines in FIG. 2, among the five connecting portions 56, three of the connecting portions 56 _2, 56 _3, 56 ₄ of the central portion along the radial direction, the circumferential direction It is inclined with respect to. On the other hand, connecting portions 56 ₅ of the connecting portions 56 ₁ and the innermost side of the outermost diameter side is arranged in parallel with the circumferential direction. When the crossover portion 56 is disposed to be inclined in the circumferential direction, it does not interfere with the crossover portion 56 from other slots 24 indicated by U2 to W2. In contrast, the transfer section 56 _1, 56 ₅ which are arranged parallel to the circumferential direction, caused to interfere with the connecting portions 56 of the other slots 24 shown in U2～W2. If it is going to avoid this interference, the height of a coil end will become high and a rotary electric machine stator will enlarge.

Therefore, as shown by the transfer section 60 ₁ of the thick one-dot chain line in FIG. 2, in the slot 24 _L, shifting the magnitude of S to the transfer section 56 ₁ of the outermost diameter side to the outside of the outer diameter side. Similarly, as shown by the transfer section 60 ₅ chain line thick one-dot, in the slot 24 _L, the transfer section 56 ₅ of innermost side shift in the magnitude of S to the outside of the inner diameter side. The shift to the inner diameter side is performed within a range not exceeding the inner peripheral position of the stator core 12 connecting the tips of the teeth 22. In this way, the transfer section 60 ₅ of the connecting portions 60 ₁ and the innermost side of the outermost diameter side is disposed inclined with respect to the circumferential direction, connecting portions of the other slots 24 shown in U2～W2 56 There is no interference with. Thereby, the height of the coil end can be suppressed.

FIG. 3 is a perspective view of the coil end on the lead side in the stator 10 in a state where the coil holding plate 30 is not used. Here, the state on the outermost diameter side of each segment coil protruding from the slot 24 of U1, U2, V1, and V2 is shown. As described in FIG. 2, the transition portion 60 ₁ of the segment coil 50 ₁ protruding from the slot 24 _{L of} U1 is shifted from the outermost diameter side of the slot 24 _L to the outer diameter side by the size of S. For transfer section 60 ₁ is difficult to bend immediately projecting from axial end faces of the anti-lead side of the stator core 12, this shift, crossover portions 56 ₁ is performed after a bit projecting from the axial end surface of the stator core 12. In FIG. 3, the protruding amount is indicated as H. In the crossover portion 60 ₁ , a portion that protrudes with H in the axial direction and shifts with S in the radial direction is indicated as a shift portion 61 ₁ .

Thus, by using the transfer section 60 ₁ of the outermost diameter side of performing a shift in the radial direction, it is possible to suppress the height of the coil end which including outermost diameter side of the connecting portions 60 ₁ The shift portion 61 ₁ is in a state of floating without being supported by the upper portion of the axial end surface of the stator yoke 20. The same applies to the transition portion 60 ₅ of the segment coil 50 ₅ on the innermost diameter side. Therefore, the axial position and the like of the shift portion where the radial shift is performed on the outermost diameter side and the innermost diameter side of the coil end are in an unstable state.

  The coil holding plate 30 functions to reliably hold the coil 14 including the outermost diameter side and the innermost diameter side of the coil end. Hereinafter, the contents of the coil holding plate 30 and the effects thereof will be described in detail with reference to FIGS. 4 and 5.

  FIG. 4 is a perspective view showing the stator core 12 and the coil holding plate 30 disposed on the end surface on the side opposite to the stator core 12. Here, the portions of the coil through holes 34 of U1, U2, V1, and V2 are shown in correspondence with FIG.

The coil holding plate 30 is an annular member, and the same number of holding portions 32 as the plurality of teeth 22 of the stator core 12 and the same number of coil through holes 34 as the plurality of slots 24 extend along the circumferential direction. Arranged radially. The length along the circumferential direction of the coil through hole 34 is shorter on the inner diameter side than the outer diameter side, and the length along the circumferential direction of the holding portion 32 is shorter on the inner diameter side than on the outer diameter side. The coil through hole 34 _L is a coil through holes corresponding to the slot 24 _L.

  The size of the coil through hole 34 is set slightly smaller than the size of the slot 24. For example, the hole length along the radial direction of the coil through hole 34 is about 1 mm shorter than the hole length along the radial direction of the slot 24. The outer diameter side length along the circumferential direction of the coil through hole 34 is about 1 mm shorter than the outer diameter side length along the circumferential direction of the slot 24. The length on the inner diameter side along the circumferential direction of the coil through hole 34 is about 1 mm shorter than the length on the inner diameter side along the circumferential direction of the slot 24. These dimensions are merely examples, and are appropriately changed according to the specifications of the stator core 12, the coil 14, the segment coil 50, and the like.

  The holding part 32 of the coil holding plate 30 includes a central holding part 36 at the central part in the radial direction, an outer-diameter-side protruding part 40 protruding from the central holding part 36 on the outer diameter side, and a central holding part 36 on the inner diameter side. Also has an inner diameter side protruding portion 42 that protrudes.

  The holding part 32 is a surface that faces the opposite end surface of the stator core 12 when the coil holding plate 30 is disposed on the stator core 12, with the bottom surface being the bottom surface of the coil holding plate 30. The central holding part 36, the outer diameter side protruding part 40, and the inner diameter side protruding part 42 constituting the holding part 32 are all curved surfaces with a smooth top surface and take a cross section perpendicular to the radial direction along the circumferential direction. It has a shape including a symmetrical partial arc. As a result, when the segment coil 50 at the coil end is bent or twisted, the center holding portion 36 or the outer diameter side protrusion portion 40 or the inner diameter side protrusion portion 42 receives the lower surface of the segment coil 50 at its top surface. Work to hold.

  FIG. 4 shows the height dimension with respect to the bottom surface of the holding part 32 and the length dimension along the radial direction for the central holding part 36, the outer diameter side protruding part 40, and the inner diameter side protruding part 42. The length along the radial direction is a length measured along the center line with respect to the circumferential direction of the holding portion 32.

The height h _C of the top surface of the central retaining portion 36 is set to the required height to receive three of the connecting portions 56 _2, 56 _3, 56 ₄ of the central portion as described in FIG. The height h _O of the top surface of the outer diameter side protruding portion 40, to support the shift portion 61 ₁ in the transfer section 56 ₁ of the outermost diameter side as described in FIG. 3, is set to a value higher than h _C The Similarly, the height h _I of the top surface of the inner diameter side protruding portion 42, to support the shift portion in the transfer section 56 ₅ of innermost side is set to a value higher than h _C. h _O and h _I may be the same value. The heights h _O and h _I of the top surfaces of the outer diameter side protrusion 40 and the inner diameter side protrusion 42 are higher than h _C because the shift portion is held as an axial protrusion along the shape of the shift portion. This is to fix the position.

The length L _C along the radial direction of the central holding portion 36 is the same as the length along the radial direction of the coil through hole 34. In other words, the center holding portion 36 is a portion provided between adjacent coil through holes 34. The length L _O is in the radial direction of the outer diameter side protruding portion 40 is longer than the size of S in the radial direction of the shift in the transfer section 56 ₁ of the outermost diameter side as described in FIG. 2, the outer diameter side protruding portion The position of the outer diameter side of 40 is set to a value that does not exceed the outer diameter of the stator core 12. The length L _I in the radial direction of the inner diameter side protruding portion 42 is longer than the size of S in the radial direction of the shift in the transfer section 56 ₅ of innermost side as described in FIG. 2, the inner diameter of the inner diameter side protruding portion 42 The position on the side is set on the outer diameter side of the inner diameter position of the stator core 12 connecting the tips of the teeth 22. These dimensional relationships can be appropriately changed depending on the specifications of the rotating electrical machine including the rotor.

  The outer diameter side connection portion 44 in the coil holding plate 30 is a portion that connects the plurality of outer diameter side protrusions 40 to each other, and forms the outer peripheral portion of the coil holding plate 30. The outer diameter of the coil holding plate 30 defined by the outer diameter side connecting portion 44 is smaller than the outer diameter of the stator core 12. The inner diameter side connecting portion 46 is a portion that connects the plurality of inner diameter side protruding portions 42 to each other, and forms the inner peripheral portion of the coil holding plate 30. The inner diameter of the coil holding plate 30 defined by the inner diameter side connecting portion 46 is larger than the inner diameter of the stator core 12 connecting the tips of the teeth 22. These dimensional relationships can be appropriately changed depending on the specifications of the rotating electrical machine including the rotor.

  FIG. 5 is a diagram showing the operational effect of the coil holding plate 30 and corresponds to FIG. 3 when the coil holding plate 30 described in FIG. 4 is used. Here, the state of the outermost diameter side of each segment coil which protrudes from the coil through-hole 34 of U1, U2, V1, V2 is shown.

Compared with FIG. 3, by using the coil holding plate 30, the shift portion 61 ₁ of the crossover portion 60 ₁ is fixed by contact holding at the contact portions 62 and 64 of the outer diameter side projection portion 40, and the shaft of the shift portion 61 ₁ is fixed. Directional position and circumferential position are stable. Although not shown in FIG. 5, in the innermost side shift portion of the connecting portions 60 ₅ is fixed by the contact holding at the contact portion of the inner diameter side protruding portion 42, the axial position and circumferential position of the shift portion is stable To do.

FIG. 6 shows, for comparison, a coil holding plate that includes a holding portion 37 that has neither the outer diameter side protruding portion 40 nor the inner diameter side protruding portion 42 and has a smooth curved surface having the same height along the radial direction. An example using 31 is shown. In this example, three of the connecting portions 56 _2, 56 _3, 56 ₄ lower surface of the central portion as described in FIG. 2 is held by the holding portion 37, the shift portion 61 ₁ of the connecting portions 60 ₁ In the holding portion 37 most not retained, it is hardly improved from unstable state of the shift portion 61 ₁ of FIG. Not shown in FIG. 6, but the shift portion also transfer section 60 ₅ on the outermost inner diameter side is hardly held by the holder 37.

  On the other hand, as shown in FIG. 5, by providing the coil holding plate 30 with the outer diameter side protrusion 40 and the inner diameter side protrusion 42 along the shape of the shift portion, the coil assembly workability is improved. The local surface pressure applied to the coil and the coil holding plate 30 during bending or twisting can be reduced. Thereby, the damage which may arise in a coil or a coil holding plate can be controlled. Further, as apparent from comparison with FIG. 6, since the axial position and the circumferential position of the shift portion are stable, the rotating electrical machine having the coil wound stably while suppressing the height of the coil end. A stator can be provided.

10 (rotary electric machine) stator, 12 stator core, 14 coils, 16 insulator, 20 stator yoke, 22 teeth, 24, 24 _R , 24 _L slot, 28 magnetic thin plate, 30, 31 coil holding plate, 32, 37 holding portion, 34, 34 _L coil through hole, 36 center holding part, 40 outer diameter side protrusion, 42 inner diameter side protrusion, 44 outer diameter side connection part, 46 inner diameter side connection part, 50, 50 ₁ , 50 ₂ , 50 ₃ , 50 _4, 50 ₅ segment coil, 52 _1, 52 _2, 52 _3, 52 _4, 52 _5, 54 _1, 54 _2, 54 _3, 54 _4, 54 ₅ legs, 56 _1, 56 ₂ , 56 ₃ , 56 ₄ , 56 ₅ , 60 ₁ , 60 ₅ crossing part, 62, 64 contact part, 61 ₁ shift part.

Claims (1)

A stator core having an annular stator yoke, a plurality of teeth projecting from the stator yoke to the inner diameter side, and a plurality of slots which are spaces between the adjacent teeth;
The stator core has the same number of coil through holes as the plurality of slots and the same number of holding portions as the plurality of teeth, and the corresponding coil through holes and the slots are aligned in the axial direction of the stator core. An annular coil holding plate disposed on the end face;
A coil that passes through the coil through hole and the slot, and is wound around the holding portion and the teeth;
With
The coil has a transition part at the coil end.
The outermost diameter side coil and the innermost diameter side coil protrude in the axial direction as compared with other coils, the outermost diameter side coil is shifted to the outer diameter side, and the innermost diameter side coil is shifted to the inner diameter side,
The holding part of the coil holding plate is
A central holding portion at the central portion in the radial direction;
An outer-diameter-side protruding portion that protrudes from the central holding portion on the outer-diameter side corresponding to the outermost-diameter side coil;
On the inner diameter side corresponding to the innermost diameter side coil, on the inner diameter side protruding portion protruding from the center holding portion,
A rotating electrical machine stator comprising:

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