WO2013179491A1

WO2013179491A1 - Rotating electric machine, stator for rotating electric machine, and vehicle

Info

Publication number: WO2013179491A1
Application number: PCT/JP2012/064316
Authority: WO
Inventors: 健治友原; 前村　明彦; 岳司井上; 憲正足立
Original assignee: 株式会社安川電機
Priority date: 2012-06-01
Filing date: 2012-06-01
Publication date: 2013-12-05
Also published as: JP5909790B2; JPWO2013179491A1; CN104364996A; CN104364996B

Abstract

This rotating electric machine (100) comprises: a rotor (2); and a stator (1) including a stator core (1a) that has a plurality of slots (11) and that is arranged so as to oppose the rotor, and a plurality of coils (1b) each mounted, in a concentric winding, to the slots of the stator core. The coils of the stator include at least a first coil (30) that has: a pair of first coil side parts (31); a pair of first fold-back parts (32) contiguous with the pair of first coil side parts, the first fold-back part being folded back at the coil end in a substantially U shape toward the outer side in the radial direction of the stator core; and a first connection part (33) that connects the pair of first fold-back parts.

Description

Rotating electric machine, stator for rotating electric machine and vehicle

The present invention relates to a rotating electrical machine, a stator for a rotating electrical machine, and a vehicle, and more particularly, to a rotating electrical machine including a coil mounted by concentric winding, a stator for a rotating electrical machine, and a vehicle.

Conventionally, a rotating electric machine including a coil mounted by concentric winding is known. Such a rotating electrical machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-189078.

The above Japanese Patent Application Laid-Open No. 2009-189078 discloses a rotating electrical machine including a rotor arranged on the inner peripheral side of a stator and a stator including a plurality of coils. The stator includes a first coil with a coil end facing the teeth end surface of the stator, a second coil with a coil end facing the radially outer portion of the stator, and coil ends at both axial ends on the inner peripheral side of the stator. A third coil facing the end face of the arranged rotor is included. In this rotating electric machine, since the third coil of the stator and the rotor interfere with each other, the rotor is placed in the stator in a state where one of the coil ends at both axial ends of the third coil is bent so as not to interfere with the rotor. After being assembled, one coil end of the third coil is bent to the rotor side by a dedicated press facility. Thereby, the coil ends at both axial ends of the third coil are arranged at positions facing the end face of the rotor.

JP 2009-189078 A

In the conventional rotating electrical machine as described above, in order to arrange the coil ends at both ends in the axial direction of the third coil at positions where they interfere with the rotor, one coil end of the third coil after the rotor is assembled in the stator. Is required to be bent by a dedicated press facility, resulting in inconvenience that the manufacturing process and the manufacturing facility become complicated. For this reason, in order to suppress complication of the manufacturing process and manufacturing equipment, it is conceivable to prevent interference by bending the coil end of the third coil not to the rotor side (radially inner side) but to the radially outer side. However, in this case, the coil end of the third coil overlaps with one or both of the coil ends of the first coil and the second coil, and thus the protruding height (dimension in the rotation axis direction) of the coil end is large. There is a problem of becoming. An increase in the protruding height of the coil end is not preferable because it increases the size of the rotating electrical machine and increases the loss.

The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a rotating electrical machine and a rotating electrical machine capable of suppressing an increase in the protruding height of a coil end. A stator for a vehicle and a vehicle are provided.

A rotating electrical machine according to a first aspect includes a rotor, a stator core having a plurality of slots, the stator core being disposed so as to face the rotor, and a plurality of coils mounted concentrically on the slots of the stator core. The stator coil is continuous from the pair of first coil sides inserted into the different slots and the pair of first coil sides, and the end of the stator core is oriented toward the axial end surface of the stator core at the coil end. It includes at least a first coil having a pair of first folded portions folded outward in the radial direction and a first coupling portion coupling the pair of first folded portions.

In the rotating electrical machine according to the first aspect, as described above, the pair of first folding portions and the pair of first folding portions that are folded back radially outward of the stator core so that the front ends thereof face the axial end surfaces of the stator core at the coil ends. A first coil having a first connecting part for connecting the parts. Thereby, since the front-end | tip part of a pair of 1st folding | turning part of a 1st coil is arrange | positioned at the axial direction end surface side of a stator core, a 1st connection part can be closely approached to the axial direction end surface of a stator core. As a result, even if the coil end of another coil is overlapped with the coil end of the first coil, it is possible to suppress an increase in the protruding height of the coil end.

A stator for a rotating electrical machine according to a second aspect includes a stator core having a plurality of slots, and a plurality of coils mounted concentrically on the slots of the stator core, and the coils are inserted into different slots, respectively. A pair of first folded portions, which are continuous from the coil side portions and the pair of first coil side portions, and are folded back outward in the radial direction of the stator core so that the tips thereof face the axial end surfaces of the stator core at the coil ends; A first coil having at least a first connecting portion for connecting the one folded portion.

In the stator for a rotating electrical machine according to the second aspect, as described above, a pair of first folded portions that are folded outward in the radial direction of the stator core so that the tip end faces the axial end surface of the stator core at the coil end, and a pair of first folded portions. The 1st coil which has the 1st connection part which connects 1 folding | turning part is provided. Thereby, since the front-end | tip part of a pair of 1st folding | turning part of a 1st coil is arrange | positioned at the axial direction end surface side of a stator core, a 1st connection part can be closely approached to the axial direction end surface of a stator core. As a result, even if the coil end of another coil is overlapped with the coil end of the first coil, it is possible to suppress the protruding height of the coil end portion from increasing.

A vehicle according to a third aspect is a vehicle including a rotating electrical machine, the rotating electrical machine having a rotor, a plurality of slots, a stator core disposed so as to face the rotor, and concentrically winding the slots of the stator core. A stator having a plurality of mounted coils, the coils of the stator being continuous from the pair of first coil sides inserted into the different slots, and the pair of first coil sides, and leading at the coil end. Including at least a first coil having a pair of first folded portions folded back radially outward of the stator core so as to face the axial end surface of the stator core, and a first coupling portion coupling the pair of first folded portions. .

In the vehicle according to the third aspect, as described above, the rotating electrical machine is provided with a pair of first folded portions that are folded outward in the radial direction of the stator core so that the tip end faces the axial end surface of the stator core at the coil end, A first coil having a first connecting part for connecting the first folded part is provided. Thereby, since the front-end | tip part of a pair of 1st folding | turning part of a 1st coil is arrange | positioned at the axial direction end surface side of a stator core, a 1st connection part can be closely approached to the axial direction end surface of a stator core. As a result, even if the coil end of another coil is overlapped with the coil end of the first coil, it is possible to suppress an increase in the protruding height of the coil end.

According to the rotating electric machine, the rotating electric machine stator, and the vehicle, it is possible to suppress an increase in the protruding height of the coil end.

It is the perspective view which showed typically the whole structure of the electric motor by 1st Embodiment. It is the typical top view which looked at the electric motor shown in FIG. 1 from the axial direction. It is the perspective view which showed the U-phase coil of the electric motor by 1st Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 1st Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 1st Embodiment. It is the schematic diagram which showed the coil arrangement | positioning at the time of developing the stator of the electric motor shown in FIG. 1 planarly, and seeing from the radial direction outer side. It is a schematic diagram for demonstrating the structure of the coil of each phase of the electric motor shown in FIG. It is the perspective view which showed typically the whole structure of the electric motor by 2nd Embodiment. It is the typical top view which looked at the electric motor shown in FIG. 8 from the axial direction. It is the perspective view which showed the U-phase coil of the electric motor by 2nd Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 2nd Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 2nd Embodiment. It is the perspective view which showed typically the whole structure of the electric motor by 3rd Embodiment. It is the perspective view which showed the U-phase coil of the electric motor by 3rd Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 3rd Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 3rd Embodiment. It is the perspective view which showed typically the whole structure of the electric motor by 4th Embodiment. It is the perspective view which showed the U-phase coil of the electric motor by 4th Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 4th Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 4th Embodiment. It is a schematic diagram for demonstrating the electric motor by 5th Embodiment. It is a block diagram for demonstrating the electric motor by 5th Embodiment. It is the perspective view which showed typically the whole structure of the electric motor by 6th Embodiment. It is the perspective view which showed the U-phase coil of the electric motor by 6th Embodiment. It is the perspective view which showed the V phase coil of the electric motor by 6th Embodiment. It is the perspective view which showed the W phase coil of the electric motor by 6th Embodiment. It is a figure for demonstrating the motor vehicle by 7th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
First, the configuration of the electric motor 100 according to the first embodiment will be described with reference to FIGS. 1st Embodiment demonstrates the electric motor 100 which is an example of a rotary electric machine.

As shown in FIGS. 1 and 2, the electric motor 100 includes a stator 1 that is a fixed portion and a rotor 2 that is a rotating portion (see a one-dot chain line). The rotor 2 includes a shaft 21 (see an alternate long and short dash line), a rotor core 22 (see an alternate long and short dash line), and a plurality of permanent magnets (not shown), and is rotatable around the shaft 21. The stator 1 is an example of a “rotor electric machine stator”.

The stator 1 includes a stator core 1a having a plurality of slots 11 and a plurality of coils 1b mounted in the slots. The stator core 1a is formed in a cylindrical shape, and has a plurality of teeth 12 extending inward in the radial direction B on the inner peripheral side. The teeth 12 are provided at equiangular intervals along the circumferential direction C of the stator core 1 a, and a portion between the teeth 12 is a slot 11.

In the first embodiment, the electric motor 100 is a three-phase AC rotating electrical machine in which three-phase coils are concentrically wound with distributed windings and mounted in each slot 11. The electric motor 100 includes, for example, a rotating electrical machine having 8 poles and 48 slots, and the number of slots per phase per pole q = 2 (= 48 / (3 × 8)). The plurality of coils 1b are composed of three types of coils, a U-phase coil 30, a V-phase coil 40, and a W-phase coil 50, corresponding to each phase of the three-phase alternating current. As shown in FIGS. 3 to 5, the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 have shapes and lengths (coil circumferential lengths) different from each other. The U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are examples of “first coil”, “second coil”, and “third coil”, respectively.

As an example, the concentric coil arrangement is shown in FIG. One coil 1b occupies two different slots 11 at intervals (four slots in FIG. 6), and adjacent two coils 1b of other phases are arranged in the slot 11 between one side at a time. Therefore, each coil 1b is arranged in two slots in the order of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 from the right side in FIG.

As shown in FIG. 7, each coil 1b is a flat strip-shaped edgewise coil in which flat conductor wires are wound and stacked. Specifically, the flat conducting wire has a substantially rectangular cross section having a width W1 and a thickness t1 (W1> t1) in the cross section. The flat conducting wires are stacked in a row in the thickness direction in the slot 11. Thereby, the coil 1b has the laminated surface f formed by laminating | stacking a flat conducting wire, and the end surface e of the lamination direction. The lamination width W2 of the lamination surface f is substantially equal to the thickness t1 of the flat conductor wire × the number of laminations, and the width of the end face e (the thickness of the coil 1b) is equal to the width W1 of the flat conductor wire. As shown in FIG. 1, each coil 1b arranged in the slot 11 has a portion (coil end) that protrudes (exposes) in the axial direction from both ends in the axial direction A of the stator core 1a (slot 11).

Next, the coils for each phase will be specifically described. Hereinafter, the axial direction A of the cylindrical stator core 1a is referred to as “axial direction”, the radial direction B of the stator core 1a is referred to as “radial direction”, and the circumferential direction C of the stator core 1a is referred to as “circumferential direction”.

As shown in FIGS. 1 and 3, the U-phase coil 30 includes a pair of coil side portions 31 inserted into different slots 11 and a pair of folded portions 32 continuous from the pair of coil side portions 31 at the coil end. And a connecting portion 33 that connects the pair of folded portions 32. The coil side portion 31, the folded portion 32, and the connecting portion 33 are examples of “first coil side portion”, “first folded portion”, and “first connecting portion”, respectively. In the first embodiment, the coil ends at both ends in the axial direction of each of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are formed in substantially the same shape (symmetrical shape in the axial direction). Only the coil end will be described.

The pair of folded portions 32 have the same shape. Specifically, the folded portion 32 is formed by folding the coil side portion 31 protruding in the axial direction from the slot 11 into a substantially U shape radially outward at the coil end (see FIG. 1). As shown in FIG. 6, the protrusion height (maximum height) from the core end surface 1c of the folded portion 32 is H1. Further, the folded portion 32 is such that the tip end surface 32a of the folded portion 32 faces the stator core 1a at a distance D1 (D1 <H1) in the vicinity of the axial end surface of the stator core 1a (hereinafter referred to as the core end surface 1c). Is formed.

As shown in FIGS. 1 and 3, the connecting portion 33 is formed so as to extend in the circumferential direction, and connects the tip portions of the folded portion 32 in the vicinity of the core end surface 1c. The connecting portion 33 is arranged so that the laminated surface f of the edgewise coil faces the core end surface 1c and is substantially parallel to the core end surface 1c. In addition, the coil end of the U-phase coil 30 is formed in a shape having a concave portion 34 that is open on the outside in the axial direction and includes a pair of folded portions 32 and a connecting portion 33 when viewed from the radial direction. As shown in FIG. 6, a part of the coil ends of the other coils (the V-phase coil 40 and the W-phase coil 50) are arranged inside the concave portion 34.

As shown in FIG. 1 and FIG. 4, the V-phase coil 40 has a pair of coil sides 41 inserted into different slots 11. The V-phase coil 40 connects, at the coil end, the folded portion 42 that continues from one coil side portion 41, the bent portion 43 that continues from the other coil side portion 41, and the folded portion 42 and the bent portion 43. And a connecting portion 44. The folded portion 42 is folded back in a substantially U shape radially outward, and the bent portion 43 is folded in a substantially S shape radially outward. The coil side portion 41, the folded portion 42, the bent portion 43, and the connecting portion 44 are respectively “second coil side portion”, “second folded portion”, “first bent portion”, and “second connecting portion”. It is an example.

The folded portion 42 has a substantially U-shape similar to the folded portion 32 of the U-phase coil 30. Unlike the folding part 32, the protruding height of the folding part 42 is H2 (> H1) (see FIG. 6). In addition, the protrusion height H2 of the folding | returning part 42 should just be the height which can form a substantially U shape. A tip end surface 42 a (see FIG. 4) of the folded portion 42 is disposed inside a concave portion 34 formed by the pair of folded portions 32 and the connecting portion 33 of the U-phase coil 30.

The bent portion 43 is formed by bending a coil side portion 41 protruding in the axial direction from the slot 11 into a substantially S shape radially outward at the coil end. Specifically, the bent portion 43 is formed in a substantially S shape by being folded outward at approximately 90 degrees along the laminating direction (radial direction) of the flat wire, and then internally folded at approximately 90 degrees. ing. Accordingly, the distal end surface 43a of the bent portion 43 faces the opposite side (axially outer side) from the core end surface 1c. The protruding height of the distal end surface 43a of the bent portion 43 coincides with the protruding height H2 of the folded portion 42. However, the protruding height of the distal end surface 43a of the bent portion 43 does not have to coincide with the height H2. Further, the bent portion 43 is disposed inside the concave portion 34 of the U-phase coil 30 (adjacent U-phase coil) different from the folded portion 42.

The connecting portion 44 is formed so as to connect the front end portion of the folded portion 42 facing the core end surface 1c side and the front end portion of the bent portion 43 facing the opposite side to the core end surface 1c. As shown in FIG. 6, the connecting portion 44 includes a concave first portion 45 whose outer side in the axial direction is opened as viewed from the radial direction, and a convex second portion 46 straddling the folded portion 32 of the U-phase coil 30. And a stepped shape including The concave first portion 45 is disposed in the concave portion 34 of the U-phase coil 30. The convex second portion 46 is formed so as to straddle the folded portion 32 of the U-phase coil 30 from the outside in the axial direction. The step portion between the first portion 45 and the second portion 46 does not interfere with both the folded portion 32 of the U-phase coil 30 and the bent portion 52 described later of the W-phase coil 50. It is arranged at the approximate center of the whole. As shown in FIGS. 1 and 4, in the first portion 45 and the second portion 46, the laminated surface f of the edgewise coil is opposed to the core end surface 1c except for the central step portion, and is substantially parallel to the core end surface 1c. And it is formed to extend along the circumferential direction. As shown in FIG. 2, the connecting portion 44 is disposed so as to overlap the connecting portion 33 of the U-phase coil 30 in the axial direction (see the hatched area in FIG. 2).

As described above, in the V-phase coil 40, the folded portion 42, the bent portion 43, and the first portion 45 of the connecting portion 44 are disposed inside the concave portion 34 of the U-phase coil 30. For this reason, as shown in FIG. 6, the concave first portion 45 of the connecting portion 44 is disposed so as to be housed in the concave portion 34 of the U-phase coil 30.

As shown in FIGS. 1 and 5, the W-phase coil 50 includes a pair of coil sides 51 inserted into different slots 11 and a pair of bent portions 52 continuous from the pair of coil sides 51 at the coil end. And a connecting portion 53 that connects the pair of bent portions 52. The coil side 51, the bent portion 52, and the connecting portion 53 are examples of the “third coil side”, the “second bent portion”, and the “third connecting portion”, respectively.

The pair of bent portions 52 has a substantially S-shape similar to the bent portion 43 of the V-phase coil 40. As shown in FIG. 6, the distance from the end surface 52a of the bent portion 52 (see FIG. 5) from the core end surface 1c matches the protruding height H3 (> H2) of the W-phase coil 50. Each of the pair of bent portions 52 is disposed in the concave first portion 45 of the connecting portion 44 of the adjacent V-phase coil 40. Further, since the concave first portion 45 is disposed so as to be accommodated in the concave portion 34 of the U-phase coil 30, the pair of bent portions 52 disposed in the concave first portion 45 are both The U-phase coil 30 is disposed in the recessed portion 34 of the adjacent U-phase coil 30.

As shown in FIG. 5, the connecting portion 53 is formed so as to connect the tip portions of a pair of bent portions 52 facing away from the core end surface 1 c. Further, as shown in FIG. 6, the connecting portion 53 passes through the outside in the axial direction of the convex second portion 46 of the connecting portion 44 of the V-phase coil 40, and the concave first portion 45 of the adjacent V-phase coil 40. It is formed to straddle between. The connecting portion 53 is formed so that the laminated surface f of the edgewise coil faces the core end surface 1c, is substantially parallel to the core end surface 1c, and extends in the circumferential direction. As shown in FIG. 2, the connecting portion 53 is arranged so as to overlap the connecting portion 33 of the U-phase coil 30 and the connecting portion 44 of the V-phase coil 40 in the axial direction (see the hatched area in FIG. 2).

As described above, the coil ends of the U-phase coil 30, the W-phase coil 50, and the V-phase coil 40 are all bent radially outward (or folded back), whereby the radially inner rotor 2 (see FIG. 1). ) Is formed so as not to interfere. Further, as shown in the hatched area of FIG. 2, the connecting

portions

33, 44, and 53 of the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 are arranged so as to overlap each other in the axial direction. The protrusion height of the coil end in the entire stator 1 of the first embodiment is H3 (the protrusion height of the W-phase coil 50) (see FIG. 6) at the maximum.

In the first embodiment, as described above, the pair of folded portions 32 folded in a substantially U shape outwardly in the radial direction of the stator core 1a at the coil end, and the connecting portion 33 that couples the pair of folded portions 32. A U-phase coil 30 is provided. Thereby, since the front-end | tip part of a pair of folding | turning part 32 of the U-phase coil 30 is arrange | positioned at the core end surface 1c side of the stator core 1a, the connection part 33 can be brought close to the core end surface 1c side. As a result, even if the coil end of another coil (V-phase coil 40, W-phase coil 50) is overlapped on the coil end of the U-phase coil 30, it is possible to suppress an increase in the protruding height of the coil end. it can.

In the first embodiment, as described above, the folded portion 32 of the U-phase coil 30 is formed so that the tip portion of the folded portion 32 faces the stator core 1a in the vicinity of the core end surface 1c, and the connecting portion 33 is formed. The tip portions of the folded portions 32 in the vicinity of the core end surface 1c are connected to each other. Thereby, since the connection part 33 is arrange | positioned in the position close | similar to the core end surface 1c, it can suppress effectively that the protrusion height of a coil end becomes large.

In the first embodiment, as described above, the connecting portion 33 of the U-phase coil 30 is configured to be substantially parallel to the core end surface 1c and extend in the circumferential direction along the core end surface 1c. Thereby, since the whole connection part 33 is arrange | positioned so that it may adjoin to the core end surface 1c, the protrusion height of the connection part 33 can be made small.

Further, in the first embodiment, as described above, the connecting portion 33 of the U-phase coil 30 is such that the laminated surface f of the band-shaped edgewise coil formed by laminating the rectangular conductive wires faces the core end surface 1c. Form. Thereby, the protrusion height of the connection part 33 becomes an addition part of the distance D1 from the core end surface 1c, and the thickness (width W1 of the end surface e) of an edgewise coil. In the band-shaped edgewise coil, the thickness (the width W1 of the end surface e) is smaller than the width (the width W2 of the stacked surface f), and thus the protrusion height of the connecting portion 33 can be further suppressed accordingly. it can.

Further, in the first embodiment, as described above, the folded portion 32 of the U-phase coil 30 is folded outward in the radial direction of the stator core 1a along the lamination direction of the flat wire. Thus, a rectangular conductor having a rectangular cross section is easily bent in the stacking direction or in a direction orthogonal to the stacking direction (direction along each side of the rectangular cross section) and difficult to bend in an oblique direction (diagonal direction of the cross section). 32 can be easily bent with a small radius, and the protruding height of the folded portion 32 can be reduced. In particular, as in the first embodiment, by setting the direction in which the short side of the rectangular cross section extends as the stacking direction, it becomes easier to bend into a smaller U-shape in the stacking direction, so that the protruding height of the folded portion 32 is further reduced. be able to.

In the first embodiment, as described above, the other coil 1b (V-phase coil 40, W-phase) is formed in the concave portion 34 formed by the pair of folded portions 32 and the connecting portion 33 of the U-phase coil 30. A part of the coil end of the coil 50) is arranged. Thereby, a part of the coil end of another coil can be accommodated in the space (concave part 34) formed by the folded portion 32 and the connecting portion 33, so that the space efficiency is improved and the coil end of the coil end is improved. An increase in the protruding height can be effectively suppressed.

In the first embodiment, as described above, a part of at least one of the V-phase coil 40 and the W-phase coil 50 is disposed in the concave portion 34 of the U-phase coil 30. Accordingly, it is possible to obtain a three-phase AC electric motor 100 that can suppress an increase in the protruding height of the coil end in the stator 1.

In the first embodiment, as described above, at least one of the folded portion 42 and the bent portion 43 of the V-phase coil 40 is disposed in the concave portion 34 of the U-phase coil 30. Accordingly, since at least one of the folded portion 42 and the bent portion 43 can be accommodated in the space formed by the concave portion 34, not only the U-phase coil 30 but also the protruding height of the coil end of the V-phase coil 40 is large. It can be suppressed.

In the first embodiment, as described above, both the folded portion 42 and the bent portion 43 of the V-phase coil 40 are arranged in the concave portion 34 of the U-phase coil 30. Thereby, since both the folding | returning part 42 and the bending part 43 can be accommodated in the recessed part 34, it can suppress more effectively that the protrusion height of the coil end of the V-phase coil 40 becomes large. .

Further, in the first embodiment, as described above, the connecting portion 44 of the V-phase coil 40 is provided with the concave first portion 45 disposed in the concave portion 34 of the U-phase coil 30 and the convex portion straddling the folded portion 32. The second portion 46 is formed. Thereby, since the 1st part 45 of the V-phase coil 40 can be accommodated in the recessed part 34 of the U-phase coil 30, the space efficiency in a coil end can be improved.

In the first embodiment, the bent portion 52 of the W-phase coil 50 is disposed in the concave first portion 45 of the V-phase coil 40 as described above. As a result, the bent portion 52 of the W-phase coil 50 can be accommodated in the concave first portion 45, so that in addition to the U-phase coil 30 and the V-phase coil 40, the coil end of the W-phase coil 50 protrudes further. An increase in height can be suppressed.

In the first embodiment, as described above, the bent portion 52 of the W-phase coil 50 is disposed in the concave portion 34 of the U-phase coil 30 and in the concave first portion 45 of the V-phase coil 40. To do. Accordingly, the bent portion 52 of the W-phase coil 50 can be further accommodated in the concave space (first portion 45) of the V-phase coil 40 accommodated in the concave portion 34 of the U-phase coil 30. As a result, part of the coil ends of both the V-phase coil 40 and the W-phase coil 50 can be accommodated together in the concave portion 34 of the U-phase coil 30, so that the protruding height of the coil end is increased. Can be more effectively suppressed.

In the first embodiment, as described above, the connecting portion 53 of the W-phase coil 50 is arranged so as to straddle between the concave first portions 45 of the adjacent V-phase coils 40. As a result, the pair of bent portions 52 of the W-phase coil 50 can be accommodated in the first portion 45 of the adjacent V-phase coil 40 and can be connected by the connecting portion 53, thereby improving the space efficiency at the coil end. be able to.

(Second Embodiment)
Next, the configuration of the electric motor 200 according to the second embodiment will be described with reference to FIGS. In the second embodiment, unlike the first embodiment in which the connecting portions of the U-phase, W-phase, and V-phase coils are arranged so as to overlap each other in the axial direction, the U-phase, W-phase, and V-phase coils. An example in which the connecting portions are arranged in the radial direction will be described. The electric motor 200 is an example of a “rotary electric machine”. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the stator 101 according to the second embodiment, the plurality of coils 101b include three types of coils having different lengths of the folded portions in the radial direction corresponding to the respective phases of the three-phase alternating current. Specifically, the basic outer shape of all three types of coils of the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 is the same as that of the U-phase coil 30 of the first embodiment. In the second embodiment, as shown in FIG. 9, the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 have different radial lengths of the folded

portions

132, 142, and 152. Is formed. The stator 101 is an example of a “rotor electric machine stator”. The U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 are examples of “first coils”.

As shown in FIGS. 8 to 10, in the second embodiment, the folded portion 132 of the U-phase coil 130 is formed such that the length of the straight portion 132c between the bending

points

132a and 132b is L1. Yes. As shown in FIG. 9, the connecting portion 133 of the U-phase coil 130 is disposed on the innermost radial side (inner circumferential side) of the three-phase coils. The folded portion 132 and the connecting portion 133 are examples of the “first folded portion” and the “first connecting portion”, respectively.

As shown in FIGS. 8, 9 and 11, the V-phase coil 140 is different from the U-phase coil 130 only in the length of the straight portion 142c of the folded portion 142, and the length of the straight portion 142c is L2. Is formed. The length L2 is larger than the length L1 by at least the stacking width W2 of the stacking surface f of the edgewise coil. The folded portion 142 (straight portion 142 c) of the V-phase coil 140 is disposed in the concave portion 134 of the U-phase coil 130. For this reason, the V-phase coil 140 is configured such that the folded portion 142 straddles the connecting portion 133 of the U-phase coil 130 toward the radially outer side. As a result, as shown in FIG. 9, the connecting portion 143 (hatched portion in FIG. 9) of the V-phase coil 140 is arranged on the radially outer side without overlapping the connecting portion 133 of the U-phase coil 130. In addition, the folding | returning part 142 and the connection part 143 are examples of a "1st folding | returning part" and a "1st connection part", respectively.

As shown in FIGS. 8, 9, and 12, the W-phase coil 150 is different from the U-phase coil 30 only in the length of the straight portion 152 c of the folded portion 152, and the length of the straight portion 152 c is L3. Is formed. The length L3 is larger than the length L2 by at least the lamination width W2 of the lamination surface of the edgewise coil. The folded portion 152 (straight line portion 152 c) of the W-phase coil 150 is disposed over both the concave portion 134 of the U-phase coil 130 and the concave portion 144 of the V-phase coil 140. For this reason, the W-phase coil 150 is configured such that the folded-back portion 152 straddles both the connecting portion 133 of the U-phase coil 130 and the connecting portion 143 of the V-phase coil 140 toward the radially outer side. Thereby, as shown in FIG. 9, connecting portion 153 of W-phase coil 150 is arranged on the radially outer side without overlapping with connecting portion 133 of U-phase coil 130 and connecting portion 143 of V-phase coil 140. The folded portion 152 and the connecting portion 153 are examples of the “first folded portion” and the “first connecting portion”, respectively.

As shown in FIG. 8, the protruding heights from the core end face 1c of the coil ends of the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 are common and H21. For this reason, the protrusion height of the coil end in the entire stator 101 of the second embodiment is H21. In the second embodiment, the connecting

portions

133, 143, and 153 do not overlap in the axial direction. Therefore, the protruding height of the coil end in the entire stator 101 is smaller than that of the stator 1 of the first embodiment.

Other configurations of the second embodiment are the same as those of the first embodiment.

In the second embodiment, as described above, the pair of folded portions 132 (142, 152) folded in a substantially U shape outward in the radial direction of the stator core 1a at the coil end, and the pair of folded portions 132 (142, 152). ), U-phase coil 130, V-phase coil 140, and W-phase coil 150 having connecting portions 133 (143, 153). Thereby, since the front-end | tip part of a pair of folding | turning part 132 (142, 152) of the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 is arrange | positioned at the core end surface 1c side of the stator core 1a, the connection part 133 (143 153) can be brought closer to the core end face 1c side. As a result, it is possible to suppress an increase in the protruding height of the coil end.

In the second embodiment, as described above, the U-phase coil 130, the V-phase coil 140, and the W-phase coil 150 having different lengths of the folded portions 132 (142, 152) in the radial direction are provided, and the shaft of the stator core 1a is provided. When viewed from the direction, the connecting portions 133 (143, 153) are arranged so as not to overlap each other. The folded portion 142 of the V-phase coil 140 on the outer side in the radial direction straddles the connecting portion 133 of the U-phase coil 130 in the radial direction, and the folded portion 152 of the W-phase coil 150 is connected to the connecting portion 143 of the V-phase coil 140 and the U-phase coil. Each coil is configured to straddle both of the 130 connecting portions 133 in the radial direction. Thereby, the folding | returning part 142 (152) straddles the connection part 133 (143) arrange | positioned close | similar to the core end surface 1c side, and can reduce the protrusion height of the folding | turning part 142 (152) in the axial direction. . As a result, an increase in the protruding height of the coil end can be effectively suppressed.

In the second embodiment, as described above, the folded portion 142 (straight portion 142c) of the V-phase coil 140 is disposed in the concave portion 134 of the U-phase coil 130, and the folded portion 152 (straight line) of the W-phase coil 150 is disposed. The part 152 c) is arranged over both the concave part 134 of the U-phase coil 130 and the concave part 144 of the V-phase coil 140. Thereby, since the folding | turning part 142 and the folding | turning part 152 can be arrange | positioned in the space (concave part 134, 144) formed by the folding | turning part 132 (142) and the connection part 133 (143), the folding | turning part 142 (152 ) In the axial direction can be more effectively suppressed.

In the second embodiment, as described above, the lengths of the folded portions 132 (142, 152) in the radial direction of the stator core 1a corresponding to the respective phases of the three-phase alternating current are different from each other. Three types of coils are provided: a coil 140 and a W-phase coil 150. Thereby, it is possible to obtain a three-phase AC electric motor 200 that can effectively suppress an increase in the protruding height of the coil end.

Further, other effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
Next, the configuration of the electric motor 300 according to the third embodiment will be described with reference to FIGS. In the third embodiment, unlike the first embodiment in which the coil ends at both ends of the stator 1 have substantially the same shape (substantially symmetrical shape), the coil ends at both ends of the stator 201 have an asymmetric shape. An example formed in the above will be described. The electric motor 300 is an example of a “rotary electric machine”. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 13, the stator 201 according to the third embodiment includes a plurality of coils 201b (a U-phase coil 230, a V-phase coil 240, and a W-phase coil 250). The U-phase coil 230, the V-phase coil 240, and the W-phase coil 250 are arranged on one side (arrow A1 direction side) of the coil end, respectively. Have the same shape. On the other hand, the U-phase coil 230, the V-phase coil 240, and the W-phase coil 250 are formed such that the coil ends on the other side (arrow A2 direction side) have different shapes from the one side. The U-phase coil 230, the V-phase coil 240, and the W-phase coil 250 are examples of “first coil”, “second coil”, and “third coil”, respectively. The stator 201 is an example of a “rotor electric machine stator”.

As shown in FIGS. 13 and 14, the U-phase coil 230 of the third embodiment has a pair of bent portions that are bent in a substantially S shape radially inward at the coil end on the other side (arrow A2 direction side). 231 and a connecting portion 232 that connects the pair of bent portions 231 to each other. The distal end surface 231a of the bent portion 231 is formed to face outward in the axial direction, and the protruding height of the distal end surface 231a of the bent portion 231 from the core end surface 1c is H31. The connecting portion 232 is formed so as to extend along the circumferential direction, and is formed so that the laminated surface f of the edgewise coil is opposed to the axial end surface of the rotor 2 and is substantially parallel. At the coil end on the other side of the U-phase coil 230, a pair of bent portions 231 and a connecting portion 232 form a convex portion 233 having an open inner side in the axial direction.

As shown in FIG. 13 and FIG. 15, the V-phase coil 240 is folded at the other coil end into a bent portion 241 that is bent radially inward in a substantially S shape and in a substantially U shape radially inward. The folded portion 242 and the connecting portion 243 that connects the distal end portion of the bent portion 241 and the distal end portion of the folded portion 242 are included. Here, a substantially U-shaped folded portion 242 is formed on the opposite side (the other side) of the substantially S-shaped bent portion 43 in the coil end on one side. A substantially S-shaped bent portion 241 is formed on the opposite side (the other side) of the substantially U-shaped folded portion 42 at the coil end on one side.

The connecting portion 243 has a stepped shape including a concave first portion 244 that is open on the outer side in the axial direction and a convex second portion 245 that is open on the inner side in the axial direction when viewed from the radial direction. The first portion 244 and the second portion 245 are formed so as to extend along the circumferential direction, except for the step portion at the center, the laminated surface f of the edgewise coil is opposed to the axial end surface of the rotor 2, and substantially It is formed to be parallel. In the third embodiment, the bent portion 231 of the U-phase coil 230 is disposed in the concave first portion 244.

As shown in FIGS. 13 and 16, the W-phase coil 250 has a pair of bent portions 251 that are bent in a substantially L shape radially inward at the other coil end, and a diameter from each of the pair of bent portions 251. A pair of linear portions 252 extending inward in the direction and a connecting portion 253 that connects the tip ends of the pair of linear portions 252 are included.

The pair of linear portions 252 extend linearly inward in the radial direction, and are disposed so as to fit inside the convex second portion 245 of the V-phase coil 240 (inward in the axial direction). Further, the straight portion 252 is arranged so as to be accommodated inside the convex portion 233 of the U-phase coil 230 (in the axial direction). Further, linear portion 252 passes through the inner side in the axial direction of connecting portion 232 of U-phase coil 230 and extends radially inward from connecting portion 243 of V-phase coil 240 and connecting portion 232 of U-phase coil 230.

The connecting portion 253 is formed so as to extend along the circumferential direction, and is disposed at a position radially inward of the connecting portion 243 of the V-phase coil 240 and the connecting portion 232 of the U-phase coil 230. The connecting portion 253 is formed such that the end face e of the edgewise coil faces the axial direction, faces the axial end face of the rotor 2, and is substantially parallel.

The maximum protrusion height at the coil end on the other end side of the stator 201 of the third embodiment is the protrusion height H31 of the tip surface 231a of the bent portion 231 of the U-phase coil 230. Therefore, the coil ends of the respective phases are arranged so as to be accommodated inward in the axial direction from the convex portion 233 of the U-phase coil 230 having the protruding height H31.

Other configurations of the third embodiment are the same as those of the first embodiment.

In the third embodiment, as described above, the coil ends of the respective phase coils have an asymmetric shape. At the coil end on the other side, the bent portion 231 of the U-phase coil 230 is housed in the concave first portion 244 of the V-phase coil 240 and the inside of the convex second portion 245 of the V-phase coil 240 (in the axial direction) By accommodating the linear portion 252 of the W-phase coil 250 on the inner side, the space efficiency at the coil end can be improved.

Also, at the coil end on the other side of the stator 201, the coil of each phase is bent radially inward, and a part of the coil end of each phase opposes (overlaps) the rotor 2 in the axial direction. Even in such a configuration, the coil end on one side of the stator 201 does not overlap the rotor 2. Therefore, if the rotor 2 is assembled from one side of the stator 201 when the rotor 2 is assembled, the coil end and the rotor 2 does not interfere. Therefore, the manufacturing process and manufacturing equipment are not complicated.

Further, since the coils of each phase are bent radially inward at the coil end on the other side, when the coils of each phase are mounted on the stator 201, the coil 201b (the U phase coil 230, the V phase coil 240, and the W phase) The coil of each phase can be mounted on the stator 201 by simply inserting the coil end on the other side of the coil 250) in the axial direction (A2 direction) with respect to the slot 11.

Further, other effects of the third embodiment are the same as those of the first embodiment.

(Fourth embodiment)
Next, the configuration of the electric motor 400 according to the fourth embodiment will be described with reference to FIGS. In the fourth embodiment, another structural example of the third embodiment in which the coil ends at both ends of the stator are asymmetric will be described. The electric motor 400 is an example of a “rotary electric machine”. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

17 and 18, the stator 301 according to the fourth embodiment includes a plurality of coils 301b (a U-phase coil 330, a V-phase coil 340, and a W-phase coil 350). The U-phase coil 330 includes a folded portion 32 and a connecting portion 33 similar to those in the first embodiment at the coil end on one side. A coil end on the other side of the U-phase coil 330 is formed with a pair of bent portions 331 bent in a substantially L shape radially inward and a connecting portion 332 that connects the pair of bent portions 331 together. The connecting portion 332 is formed to extend along the circumferential direction, and is formed to be substantially parallel to the core end surface 1c (rotor end surface). Further, the connecting portion 332 is disposed so that the end face e of the edgewise coil faces the axial direction A and faces the axial end face of the rotor 2. The U-phase coil 330 is an example of a “first coil”. The stator 301 is an example of a “rotor electric machine stator”.

As shown in FIGS. 17 and 19, the V-phase coil 340 includes a connecting portion 342 that directly connects the tip ends of a pair of coil side portions 341 protruding in the axial direction from the slot 11 at the coil end on one side. . The connecting portion 342 is formed to extend along the circumferential direction across the bent portion 32 of the U-phase coil 330 and the bent portion 351 of the W-phase coil 350 described later. The connecting portion 342 is formed such that the laminated surface f of the edgewise coil faces the core end surface 1c and is substantially parallel to the core end surface 1c. The protruding height of the connecting portion 342 from the core end surface 1c is H41. The V-phase coil 340 is an example of a “second coil”.

The V-phase coil 340 includes a pair of substantially S-shaped bent portions 343 and a connecting portion 344 that connects the tip ends of the pair of bent portions 343 at the coil end on the other side. Bending portion 343 has a linear portion 345 extending radially inward, and is formed so as to pass inside in the axial direction of connecting portion 332 of U-phase coil 330. Further, the bent portion 343 is disposed in a convex portion 355 described later of the W-phase coil 350. The connecting portion 344 is formed such that the laminated surface f of the edgewise coil faces the rotor 2 and is substantially parallel to the end surface in the axial direction of the rotor 2.

As shown in FIGS. 17 and 20, the W-phase coil 350 connects a pair of bent portions 351 and a pair of bent portions 351 that are bent in a substantially S shape radially outward at the coil end on one side. And a connecting portion 352. The bent portion 351 is disposed with the distal end surface of the bent portion 351 facing the side opposite to the core end surface 1c (outside in the axial direction). Bending portion 351 is arranged in concave portion 34 of U-phase coil 330. Connecting portion 352 is formed so as to extend along the circumferential direction, and is arranged so as to overlap with connecting portion 33 of U-phase coil 330 in the axial direction. The connecting portion 352 is formed such that the laminated surface f of the edgewise coil faces the core end surface 1c and is substantially parallel to the core end surface 1c. The protruding height of the connecting portion 352 from the core end surface 1c is H41. Therefore, in the fourth embodiment, at one coil end, the connecting portion 352 of the W-phase coil 350 and the connecting portion 342 of the V-phase coil 340 are arranged along the radial direction. The W-phase coil 350 is an example of a “third coil”. The bent portion 351 and the connecting portion 352 are examples of the “second bent portion” and the “third connecting portion”, respectively.

The W-phase coil 350 has a pair of bent portions 353 bent in a substantially S shape radially inward and a connecting portion 354 connecting the pair of bent portions 353 at the coil end on the other side. The bent portion 353 is disposed such that the distal end surface of the bent portion 353 faces the side opposite to the core end surface 1c (outside in the axial direction). The connecting portion 354 is formed so as to extend along the circumferential direction. The connecting portion 354 is formed such that the laminated surface f of the edgewise coil faces the rotor 2 and is substantially parallel to the end surface in the axial direction of the rotor 2. Further, the pair of bent portions 353 and the connecting portion 352 form a convex portion 355 that is open on the inner side in the axial direction.

The maximum protruding height at the coil end on one end side of the stator 301 of the fourth embodiment is the protruding height H41 of the connecting portion 342 of the V-phase coil 340 and the connecting portion 352 of the W-phase coil 350.

Other configurations of the fourth embodiment are the same as those of the first embodiment.

In 4th Embodiment, the bending part 351 of the W-phase coil 350 is arrange | positioned in the concave part 34 of the U-phase coil 330 in the coil end of one side, and the connection part 33 of the U-phase coil 330 and the connection part of the W-phase coil 350 are arranged. 352 are arranged so as to overlap. Then, connecting portion 342 of V-phase coil 340 is arranged so as to be aligned with the connecting portion 352 of W-phase coil 350 in the radial direction. Thereby, compared with the said 1st Embodiment which has arrange | positioned so that all the

connection parts

33, 44, and 53 of a three-phase coil may overlap in an axial direction, the protrusion height of an axial direction can further be suppressed.

The other effects of the fourth embodiment are the same as those of the third embodiment.

(Fifth embodiment)
Next, with reference to FIG. 21 and FIG. 22, the structure of the electric motor 500 by 5th Embodiment is demonstrated. In the fifth embodiment, an example will be described in which a low-speed coil portion and a low-speed coil portion are provided in the coils of the respective phases of the first to fourth embodiments. The electric motor 500 is an example of a “rotary electric machine”.

In the fifth embodiment, the coil shape of each phase is arbitrary, and can be applied to any of the coil shapes shown in the first to fourth embodiments. Therefore, here, an example in which the configuration of the fifth embodiment is applied to the coils of the first embodiment (the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50) will be described.

As shown in FIG. 21, in the stator 401 according to the fifth embodiment, each of the coils 401b including the U-phase coil 30, the V-phase coil 40, and the W-phase coil 50 includes a low-speed coil section 460 and a low-speed coil section. A coil portion 470. Specifically, in each coil 401 b, a part of the laminated rectangular conductor wire constitutes a low-speed coil part 460 and the other part constitutes a low-speed coil part 470. The low-speed coil portion 460 and the low-speed coil portion 470 are separated from each other by an insulating member 480. Thus, each coil 401 b is configured such that the low-speed coil portion 460 and the low-speed coil portion 470 are arranged in the common slot 11. The stator 401 is an example of a “rotor electric machine stator”.

The low speed / high speed coil section 460 of each coil 401b is used both when the electric motor 500 is driven at a low speed and during high speed driving, and the low speed coil section 470 is configured to be used only when the electric motor 500 is driven at low speed. Yes. As shown in FIG. 22, the connection state of the low-speed coil unit 460 and the low-speed coil unit 470 can be switched by the winding switching unit CS.

Specifically, the electric motor 500 is connected to the power supply unit BU and the winding switching unit CS. The electric motor 500 is configured to be driven in response to three-phase AC power supplied from the power supply unit BU.

The low speed coil section 460 and the low speed coil section 470 of each coil 401b are electrically connected in series. Terminals TU1, TV1, and TW1 on one side of the low-speed coil unit 460 are connected to the power supply unit BU. Further, terminals TU2, TV2 and TW2 on the other side of the low-speed coil unit 460 and on one side of the low-speed coil unit 470 are connected to the winding switching unit CS. The terminals TU3, TV3, and TW3 on the other side of the low speed coil unit 470 are connected to the winding switching unit CS.

Winding switching unit CS includes a high-speed switch SW1 for short-circuiting terminals TU2, TV2 and TW2 of electric motor 500 and a low-speed switch SW2 for short-circuiting terminals TU3, TV3 and TW3 of electric motor 500.

The winding switching unit CS turns off the high-speed switch SW1 and turns on the low-speed switch SW2 during low-speed driving. As a result, the terminals TU3, TV3 and TW3 are short-circuited, and the four-phase star connection in each phase is configured by the low-speed coil section 460 and the low-speed coil section 470 of the coil 401b with the terminals TU3, TV3 and TW3 as neutral points. Is done. As a result, a voltage is applied to both the low-speed coil unit 460 and the low-speed coil unit 470 in each phase coil 401 b of the electric motor 500. Thereby, since the impedance of the coil 401b of each phase becomes large, a large voltage can be applied to the coil 401b, and the torque of the electric motor 500 during low-speed driving can be increased.

The winding switching unit CS turns on the high-speed switch SW1 and turns off the low-speed switch SW2 during high-speed driving. As a result, the terminals TU2, TV2, and TW2 are short-circuited, and a 4-wire star connection in each phase by the low-speed coil section 460 of the coil 401b is configured with the terminals TU2, TV2, and TW2 as neutral points. As a result, a voltage is applied only to the low-speed coil section 460 in each phase coil 401 b of the electric motor 500. As a result, since the impedance of each phase coil 401b is smaller than that during low-speed driving, the electric motor 500 can be driven at high speed.

Other configurations of the fifth embodiment are the same as those of the first embodiment.

In the fifth embodiment, as described above, the coil 401b of each phase is provided with the low-speed coil unit 470 used only at low speeds and the low-high speed coil unit 460 used at both high speeds and low speeds. The low speed coil portion 470 and the low speed coil portion 460 are disposed in the common slot 11. Thereby, it is possible to obtain an electric motor 500 that can suppress an increase in the protruding height of the coil end and can switch the winding according to the driving speed. In the fifth embodiment shown in FIG. 22, an example in which the connection of the coils 401b of each phase is a 4-parallel star connection is shown. However, the coil connection of each phase has a configuration other than the 4-parallel star connection. Is possible.

(Sixth embodiment)
Next, the configuration of the electric motor 600 according to the sixth embodiment will be described with reference to FIGS. In the sixth embodiment, as another structural example of the fourth embodiment in which the coil ends at both ends of the stator are asymmetric, an example in which the coil ends at both ends of the stator are formed symmetrically will be described. The electric motor 600 is an example of a “rotary electric machine”. In the sixth embodiment, the same components as those of the fourth embodiment are denoted by the same reference numerals and the description thereof is omitted.

As shown in FIG. 23, the stator 501 according to the sixth embodiment includes a plurality of coils 501b (a U-phase coil 530, a V-phase coil 540, and a W-phase coil 550). In the sixth embodiment, the coil ends of the U-phase coil 530, the V-phase coil 540, and the W-phase coil 550 are formed in substantially the same shape (symmetrical shape in the axial direction) on one side and the other side. The U-phase coil 530 is an example of a “first coil”.

23 and 24, the U-phase coil 530 has the same shape as the U-phase coil 30 of the first embodiment. That is, the folding | returning part 32 and the connection part 33 are provided in both the coil ends of one side and the other side. This is also formed by forming the other coil end of the U-phase coil 330 of the fourth embodiment in the same (symmetric) shape as the one coil end.

As shown in FIGS. 23 and 25, the V-phase coil 540 is provided with connecting portions 342 similar to those in the fourth embodiment at both coil ends on one side and the other side. The V-phase coil 540 is an example of a “second coil”.

As shown in FIGS. 23 and 26, the W-phase coil 550 is provided with a pair of bent portions 351 and a connecting portion 352 similar to those in the fourth embodiment at both coil ends on one side and the other side. . W-phase coil 550 is an example of a “third coil”.

Therefore, in the sixth embodiment, the bent portion 351 of the W-phase coil 550 is disposed in the concave portion 34 of the U-phase coil 530 at both the coil ends on one side and the other side, and the connecting portion 33 of the U-phase coil 530 is provided. Arranged so as to overlap with connecting portion 352 of W-phase coil 550. Then, connecting portion 342 of V-phase coil 540 is arranged to be aligned with the connecting portion 352 of W-phase coil 550 in the radial direction.

In the stator 501 of the sixth embodiment, the maximum protruding heights at the coil ends on one side and the other side are the same, and the protruding height H41 of the connecting portion 342 of the V-phase coil 540 and the connecting portion 352 of the W-phase coil 550 is the same. It is.

Other configurations of the sixth embodiment are the same as those of the fourth embodiment.

In 6th Embodiment, the bending part 351 of the W-phase coil 550 is arrange | positioned in the concave part 34 of the U-phase coil 530 in the coil ends of one side and the other side, and the connection part 33 of the U-phase coil 530 and the W-phase are arranged. The connecting portion 352 of the coil 550 is disposed so as to overlap. Then, connecting portion 342 of V-phase coil 540 is arranged so as to be aligned with the connecting portion 352 of W-phase coil 550 in the radial direction. Thereby, compared with the said 4th Embodiment, the protrusion height of an axial direction can further be suppressed. Comparing the coil end height, the stator 101 according to the second embodiment (H21 on both sides) <the stator 501 according to the sixth embodiment (H41 on both sides) <the stator 1 according to the first embodiment (H3 on both sides). Become.

Further, the other effects of the sixth embodiment are the same as those of the fourth embodiment.

(Seventh embodiment)
Next, with reference to FIG. 27, the structure of the motor vehicle 700 by 7th Embodiment is demonstrated. The automobile 700 is an example of a “vehicle”.

As shown in FIG. 27, the automobile 700 is provided with any one of the

electric motors

100, 200, 300, 400, 500, and 600 of the first to sixth embodiments. The remaining configuration of the seventh embodiment is similar to that of the aforementioned first to sixth embodiments.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

For example, in the first to sixth embodiments, the electric motor and the electric motor stator are shown, but a rotating electric machine such as a generator other than the electric motor and the stator for the electric rotating machine may be used.

In the first to sixth embodiments, the three-phase AC motor is shown, but the present invention can also be applied to a single-phase motor (rotary electric machine) other than the three-phase motor.

In the first to sixth embodiments, an example of using an edgewise coil in which flat conductor wires are wound and laminated has been shown, but a coil in which round wires are bundled may be used.

In the first to sixth embodiments, the example in which the concave portion formed by the folded portion and the connecting portion is formed on at least the U-phase coil. However, a V-phase coil and a W-phase coil other than the U-phase are shown. You may form a concave-shaped part in.

In the first to sixth embodiments, examples of providing a U-phase coil, a V-phase coil, and a W-phase coil as examples of the “first coil”, “second coil”, and “third coil”, respectively. Although shown, the “first coil”, “second coil”, and “third coil” may be coils corresponding to any of the U phase, the V phase, and the W phase.

In the first to sixth embodiments, an example in which a pair of folded portions that are folded back in a substantially U shape outward in the radial direction is formed on at least the U-phase coil. It may be folded back into a shape other than the shape.

In the first to sixth embodiments, the tip surface of the folded portion of the U-phase coil is formed so as to face the core end surface of the stator core. However, the tip surface of the folded portion is parallel to the core end surface. There is no need to be. As long as the front end surface of the folded portion faces the core end surface, the direction of the front end surface of the folded portion may be inclined with respect to the core end surface.

In the first to sixth embodiments, an example in which a U-shaped folded portion is formed in the U-phase coil has been described. . In other words, the folded portion may be formed in a U-shape in which the bent portion is angular instead of being formed in a U-shape in which the bent portion is rounded. In the present application, the “U-shape” includes a U-shape (a shape in which one side of a rectangular shape is removed) having an angular bent portion. Further, it is not necessary that the straight portions (portions other than the bent portions) constituting the “U-shape” are parallel.

In the first to sixth embodiments, the connection portions of the U-phase, V-phase, and W-phase coils are formed so as to extend along the circumferential direction of the stator core. Further, it may be formed so as to extend in an arc shape along the circumferential direction, or may be formed so as to extend linearly along the circumferential direction. Moreover, you may form a connection part so that it may extend in curvilinear form other than circular arc shape along the circumferential direction.

Further, in the seventh embodiment, the example in which the motor of the first to sixth embodiments is provided in an automobile is shown. However, the first to the second are applied to a vehicle for a construction machine or an agricultural vehicle. You may provide the electric motor of 6 embodiment. In addition to the vehicle, for example, the electric motor according to the first to sixth embodiments may be provided in a ship, an aircraft, or the like.

1, 101, 201, 301, 401 Stator (stator for rotating electrical machine)

1a Stator core

1b, 101b, 201b, 301b, 401b Coil 2 Rotor 11

Slot

30, 130, 140, 150, 230, 330, 530 U-phase coil (first coil)
31, 341 Coil side (first coil side)
32, 132, 142, 152 Return part (first return part)
33, 133, 143, 153 connecting portion (first connecting portion)
34, 143, 144

Concave portion

40, 240, 340, 540 V-phase coil (second coil)
41 Coil side (second coil side)
42 Return part (second return part)
43 bent part (first bent part)
44 connecting part (second connecting part)
45 First part 46

Second part

50, 250, 350, 550 W-phase coil (third coil)
51 Coil side (third coil side)
52, 351 Bent part (second bent part)
53, 352 connecting part (third connecting part)
100, 200, 300, 400, 500 Electric motor (rotary electric machine)
460 Coil part for low speed 470 Coil part for low speed 700 Automobile (vehicle)
f Laminated surface

Claims

A rotor (2);
A stator (1) including a plurality of slots (11) and a stator core (1a) arranged to face the rotor, and a plurality of coils (1b) mounted concentrically in the slots of the stator core. )
The coil of the stator is
A pair of first coil sides (31) inserted into the different slots, and a pair of first coil sides (31) are continuous from the pair of first coil sides, and at the coil ends, the stator core A rotation including at least a first coil (30) having a pair of first folding portions (32) folded outward in the radial direction and a first coupling portion (33) coupling the pair of first folding portions. Electric machine (100).
The first folded portion of the first coil is formed such that the tip portion of the first folded portion faces the stator core in the vicinity of the axial end surface of the stator core,
2. The rotating electrical machine according to claim 1, wherein the first connecting portion is configured to connect tip portions of the first folded portion in the vicinity of an axial end surface of the stator core.
The first coupling portion of the first coil is configured to be substantially parallel to an axial end surface of the stator core and extend in a circumferential direction along the axial end surface of the stator core. Rotating electric machine.
The coil is a band-shaped edgewise coil in which flat conductor wires are wound and laminated,
The first connecting portion of the first coil is configured such that a laminated surface (f) of the edgewise coil formed by laminating the rectangular conducting wires is opposed to an axial end surface of the stator core. The rotating electrical machine according to claim 1.
The rotating electrical machine according to claim 4, wherein the first folded portion of the first coil is folded outward in the radial direction of the stator core along the stacking direction of the rectangular conductor wires.
The rotating electrical machine according to claim 1, wherein the first folded portion of the first coil is folded in a U shape outwardly in the radial direction of the stator core.
The part of the coil end of another said coil is arrange | positioned in the recessed part (34) formed of a pair of said 1st folding | turning part and said 1st connection part of a said 1st coil. The rotating electrical machine described in 1.
The coil includes the first coil, the second coil (40), and the third coil (50) provided corresponding to each phase of three-phase alternating current,
A part of at least one of the second coil and the third coil is disposed in the concave portion formed by the pair of the first folded portion and the first connecting portion of the first coil. The rotating electrical machine according to claim 7.
The second coil is continuous from a pair of second coil sides (41) inserted into the different slots and one of the second coil sides, and is substantially U outward in the radial direction of the stator core at the coil end. A second folded part (42) folded back in a letter shape, and a first bent part (43) continuous from the other second coil side part and folded in a substantially S shape outward in the radial direction at the coil end. And a second connecting part (44) for connecting the second folded part and the first bent part,
At least one of the second folded portion and the first bent portion of the second coil is disposed in the concave portion formed by a pair of the first folded portion and the first connecting portion of the first coil. The rotating electrical machine according to claim 8.
Both the second folded portion and the first bent portion of the second coil are disposed in the concave portion formed by a pair of the first folded portion and the first connecting portion of the first coil. The rotating electrical machine according to claim 9.
The second coupling portion of the second coil includes a concave first portion (45) disposed in the concave portion formed by the pair of the first folded portion and the first coupling portion of the first coil. The rotary electric machine according to claim 9, further comprising a convex second portion (46) straddling the first folded portion.
The third coil is continuous from the pair of third coil sides (51) inserted into the different slots and the pair of third coil sides, and is substantially S radially outward of the stator core at the coil end. A pair of second bent portions (52) bent in a letter shape, and a third connecting portion (53) for connecting the pair of second bent portions,
The rotating electrical machine according to claim 11, wherein the second bent portion of the third coil is disposed in the concave first portion of the second coil.
The second bent portion of the third coil is in the concave portion formed by the pair of first folded portions of the first coil and the first connecting portion, and the concave first of the second coil. The rotating electrical machine according to claim 12, which is disposed in the portion.
The rotating electrical machine according to claim 12, wherein the third coupling portion of the third coil is disposed so as to straddle between the concave first portions of the adjacent second coils.
The coil includes a plurality of types of the first coils having different lengths of the first folded portion in the radial direction of the stator core,
The plurality of types of the first coils are:
When viewed from the axial direction of the stator core, the first connecting portions are arranged so as not to overlap each other,
2. The rotation according to claim 1, wherein the first folded portion of the first coil on the radially outer side is configured to straddle the first connecting portion of the first coil on the radially inner side in the radial direction. Electric.
The rotating electrical machine according to claim 15, wherein the coil includes three types of the first coils having different lengths of the first folded portion in a radial direction of the stator core corresponding to each phase of a three-phase alternating current.
The coil includes a low speed coil portion (470) used only at low speed and a low speed coil portion (460) used at both high speed and low speed,
The rotating electrical machine according to claim 1, wherein the low-speed coil unit and the low-speed coil unit are configured to be disposed in the common slot.
A stator core (1a) having a plurality of slots (11);
A plurality of coils (1b) mounted concentrically on the slots of the stator core;
The coil is
A pair of first coil sides (31) inserted into the different slots, and a pair of first coil sides (31) are continuous from the pair of first coil sides, and at the coil ends, the stator core A rotation including at least a first coil (30) having a pair of first folding portions (32) folded outward in the radial direction and a first coupling portion (33) coupling the pair of first folding portions. Electric stator (1).
The first folded portion of the first coil is formed such that the tip portion of the first folded portion faces the stator core in the vicinity of the axial end surface of the stator core,
The stator for a rotating electrical machine according to claim 18, wherein the first connecting portion is configured to connect tip portions of the first folded portion in the vicinity of an end surface in the axial direction of the stator core.
The first connecting portion of the first coil is configured to be substantially parallel to an axial end surface of the stator core and extend in a circumferential direction along the axial end surface of the stator core. Stator for rotating electrical machines.
The rotation according to claim 18, wherein a part of a coil end of another coil is disposed in a concave portion formed by the pair of the first folded portion and the first connecting portion of the first coil. Electric stator.
A vehicle (700) comprising a rotating electrical machine (100),
The rotating electric machine is
A rotor (2);
A stator (1) having a plurality of slots (11) and having a stator core (1a) arranged to face the rotor, and a plurality of coils (1b) mounted concentrically in the slots of the stator core. ) And
The coil of the stator is
A pair of first coil sides (31) inserted into the different slots, and a pair of first coil sides (31) are continuous from the pair of first coil sides, and at the coil ends, the stator core A vehicle including at least a first coil (30) having a pair of first folded portions (32) folded outward in the radial direction and a first coupling portion (33) coupling the pair of first folded portions. .