WO2023233618A1

WO2023233618A1 - Stator of dynamo-electric machine, and method for manufacturing stator of dynamo-electric machine

Info

Publication number: WO2023233618A1
Application number: PCT/JP2022/022478
Authority: WO
Inventors: 智荊; 健一中山; 徳昭日野; モハマドバシールズライカ; 章人戸谷; 勇輝熊田; 貴裕森
Original assignee: 日立Astemo株式会社
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2023-12-07

Abstract

This stator of a dynamo-electric machine includes a first coil that extends out along an axial direction from an end surface of the core, and a second coil that extends out from the end surface of the core and is inclined in the circumferential direction relative to the axial direction. The coil end section of the first coil is provided with two first radial-direction surfaces and two first circumferential-direction surfaces. The coil end section of the second coil is provided with two second radial-direction surfaces, two inclined surfaces, and a second circumferential-direction surface that is adjacent to the second radial-direction surfaces and to the second inclined surface facing toward the core. The coil end section of the second coil has curved sections that are curved toward respective radial-direction exteriors at positions between the first coils.

Description

Stator of rotating electrical machine, manufacturing method of stator of rotating electrical machine

The present invention relates to a stator for a rotating electrical machine and a method for manufacturing a stator for a rotating electrical machine.

In the stator of rotating electric machines, it is necessary to suppress the height of the coils (segment conductors) to be inserted, and it is necessary to suppress the deterioration of the coil insulation. It is necessary to realize the suppression of For example, Patent Document 1 listed below discloses a method of manufacturing a stator for a rotating electrical machine in which the joints of the leg portions of segment conductors are sealed with an insulating resin to improve the insulation of the coil ends.

Japanese Patent Application Publication No. 2018-113794

Conventionally, among the coils inserted into the core, a coil extending in the axial direction from the slot of the stator and a coil inclined in the axial direction are brought close to each other by a chuck and welded at their respective ends. However, at this time, the axially extending coil and the inclined coil may come into contact with each other at a portion other than the joint portion, which causes the problem that the enamel layer of the coil is rubbed and the insulation performance deteriorates. In view of this, it is an object of the present invention to provide a stator for a rotating electrical machine that can be welded without reducing insulation performance, and a method for manufacturing the stator for a rotating electrical machine.

A stator of a rotating electrical machine includes an annular core having a plurality of slots in the circumferential direction, a plurality of straight parts provided along the radial direction of the plurality of slots, and a part extending from both ends of the straight part to the outside of the core. A stator for a rotating electrical machine, comprising a plurality of coils having a coil end portion extending from the core, the plurality of coils having a coil end portion extending from the end surface of the core along the axial direction. a second coil that extends from an end surface of the core and is inclined in the circumferential direction with respect to the axial direction, and the coil end portion of the first coil extends in the radial direction. The coil end portion of the second coil includes two first radial surfaces facing each other and two first circumferential surfaces facing each other in the circumferential direction, and the coil end portion of the second coil a radial surface, two slanted surfaces facing each other between the two second radial surfaces, an inner slanted surface facing toward the core among the two slanted surfaces, and two second radial surfaces a second circumferential surface adjacent to the surface, and the coil end portion of the second coil has a bent portion that is bent radially outward at a position between the plurality of first coils. have
In addition, as a method for manufacturing a stator for a rotating electric machine, a plurality of coils are inserted into an annular core having a plurality of slots in the circumferential direction, and the plurality of inserted coils are oriented along the axial direction from the end face of the core. and a second coil extending from an end surface of the core and inclined in the circumferential direction with respect to the axial direction, the coil end portion of the first coil and the second coil extending from the end surface of the core. When welding and fixing the coil end portions of the second coil to each other, two first circumferential surfaces facing in the circumferential direction in the coil end portion of the first coil, and two circumferential surfaces facing in the radial direction in the second coil. Of the two inclined surfaces facing each other between the two second radial surfaces, an outer inclined surface not facing the core side, an inner inclined surface opposite to the outer inclined surface, and two second radial surfaces facing each other. A method is adopted in which the second circumferential direction surface adjacent to the direction surface is held by a jig.

It is possible to provide a stator for a rotating electrical machine that can be welded without reducing insulation performance, and a method for manufacturing the stator for a rotating electrical machine.

Overall diagram of the stator of a rotating electrical machine Diagram explaining the problems with the coil end An explanatory diagram of the configuration of a coil according to an embodiment of the present invention Explanatory diagram of the bending part of the coil and the connection between the coils in Figure 3 Explanatory diagram of each coil end surface Explanatory diagram of the gripping jig used for joining coils

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description and drawings are examples for explaining the present invention, and are omitted and simplified as appropriate for clarity of explanation. The present invention can also be implemented in various other forms. Unless specifically limited, each component may be singular or plural.

The position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

(One embodiment of the present invention and overall configuration of the device)
(Figure 1)
A stator 10 of a rotating electric machine includes a plurality of coils 1 and a stator core 2 (hereinafter referred to as core 2). The plurality of coils 1 function as a stator 10 by being inserted into the core 2. The plurality of coils 1 are inserted into the stator 10 at predetermined intervals in the circumferential direction. The coil 1 is, for example, an electrically conductive segment conductor whose surface is coated with an enamel layer.

(Figure 2)
In the stator 10, an annular core 2 includes a plurality of slots 2a into which a plurality of coils 1 are inserted in the circumferential direction. A plurality of coils 1 are inserted into the slots 2a along the radial direction of the stator 10. In the coil 1, the portion inserted into the slot 2a is referred to as a straight portion, and the portion extending from both ends of the straight portion to the outside of the core 2 is referred to as a coil end portion.

The plurality of coils 1 include a straight coil 3 extending along the axial direction from the end surface of the core 2, and a diagonal coil 4 extending from the end surface of the core 2 and inclined in the circumferential direction with respect to the axial direction. have. Here, the straight coil 3 is defined as a first coil 3 and the diagonal coil 4 is defined as a second coil 4.

The coil end portions of the first coil 3 and the coil end portions of the second coil 4 are radially coil chucked 1b when their ends are joined to each other, but at this time, coil contact 1a occurs with each other. When such coil contact 1a occurs, the problem arises that the enamel layers of the coils rub against each other, resulting in a decrease in insulation performance.

(Figures 3 and 4)
FIG. 3(a) is an explanatory diagram of a coil configuration according to an embodiment of the present invention, and FIG. 3(b) is a diagram of FIG. 3(a) viewed from the circumferential direction. Moreover, FIG. 4(a) is an explanatory diagram of the bent portion of the coil in FIG. 3, and FIG. 4(b) is an explanatory diagram of the joining of the coils.

In order to solve the problem described above with reference to FIG. 2, the coil end portion of the second coil 4 has a bent portion 5 that is bent radially outward at a position between the plurality of first coils 3. By doing this, not only does the friction of the enamel layer due to the coil contact 1a (FIG. 2) between the coils described above be suppressed, but also the bending portion 5 allows the coil end portion of the first coil 3 and the coil end portion of the second coil 4 to be suppressed. Since the ends of the end portions are close to each other, the process of forming the coil chuck 1b (FIG. 2) in the radial direction can be simplified and welded together. A welded portion 6 is formed by welding the ends of the coil end portion of the first coil 3 and the coil end portion of the second coil 4 to each other.

(Figure 5)
In the welding of the present invention, it is necessary to position the coil end portion of the first coil 3 and the coil end portion of the second coil 4. Therefore, for the coil end portion of each coil, the surface to be fixed for positioning is determined as follows.

The coil end portion of the first coil 3 includes two first radial surfaces 3c facing each other in the radial direction and two first circumferential surfaces 3a facing each other in the circumferential direction. The coil end portion of the second coil 4 includes two second radial surfaces 4c facing each other in the radial direction, two

inclined surfaces

4D, 4d facing each other between the two second radial surfaces 4c, and two second radial surfaces 4c facing each other in the radial direction. Of the two

inclined surfaces

4D, 4d, the inner inclined surface 4d faces the core 2 side, and a second circumferential surface 4a adjacent to the two second radial surfaces 4c.

Furthermore, the coil end portion of the first coil 3 includes a first axial surface 3b adjacent to two first radial surfaces 3c and two first circumferential surfaces 3a. Further, the coil end portion of the second coil 4 is arranged in the second axial direction adjacent to the two second radial surfaces 4c and the external inclined surface 4D and the second circumferential surface 4a, which are opposite to the internal inclined surface 4d. It has a surface 4b. In this way, since the first coil 3 and the second coil 4 each define the direction of the surface of the coil end portion in the axial direction, the radial direction, and the circumferential direction, the positioning of the welding joint can be clearly determined.

(Production method)
(Figure 6)
Although the process of coil chuck 1b (Fig. 2) is no longer necessary for the first coil 3 and second coil 4, as mentioned above, the gripping jig 7 for position fixing is required to weld and join the coils. Become. Therefore, the gripping surface and process for each coil explained with reference to FIG. 5 are performed as follows.

First, a plurality of coils 1 are inserted into an annular core 2 having a plurality of slots 2a in the circumferential direction. The plurality of inserted coils 1 include a first coil 3 extending along the axial direction from the end surface of the core 2, and a first coil 3 extending from the end surface of the core 2 and inclined in the circumferential direction with respect to the axial direction. A second coil 4 is included.

When the coil end portion of the first coil 3 and the coil end portion of the second coil 4 are welded and fixed to each other, two first circumferential surfaces 3a facing each other in the circumferential direction are formed at the coil end portion of the first coil 3. Among the two

slanted surfaces

4D and 4d facing each other between the two radially opposing second radial surfaces 4c at the coil end portion of the second coil 4, an external slanted surface 4D that does not face the core 2 side. and a second circumferential surface adjacent to the inner inclined surface 4d opposite to the outer inclined surface 4D and the two second radial surfaces 4c are gripped by the gripping jig 7.

Thereby, it is possible to realize welding and joining of coils having the characteristics of the present invention. Furthermore, by avoiding contact between the coils, a decrease in the insulation properties of the coils can be suppressed, and the coil chuck 1b can be omitted in the manufacturing process. Furthermore, the process of twisting the coil 1 after inserting it into the core 2 is no longer necessary, and production costs can be significantly reduced.

According to the embodiment of the present invention described above, the following effects are achieved.

(1) The stator 10 of a rotating electrical machine includes an annular core 2 having a plurality of slots 2a in the circumferential direction, a plurality of straight portions provided along the radial direction of the plurality of slots 2a, and a plurality of straight portions of the straight portions. It includes a plurality of coils 1 having coil end portions extending from both ends to the outside of the core 2. The plurality of coils 1 include a first coil 3 that extends along the axial direction from the end surface of the core 2, and a second coil 4 that extends from the end surface of the core 2 and is inclined in the circumferential direction with respect to the axial direction. and, including. The coil end portion of the first coil 3 includes two first radial surfaces 3c facing each other in the radial direction and two first circumferential surfaces 3a facing each other in the circumferential direction. The coil end portion of the second coil 4 has two second radial surfaces 4c facing each other in the radial direction, two

sloped surfaces

4D, 4d facing each other between the two second radial surfaces 4c, and two

sloped surfaces

4D, 4d facing each other between the two second radial surfaces 4c. Of the

surfaces

4D and 4d, it includes an inner inclined surface 4d facing the core 2 side and a second circumferential surface 4a adjacent to the two second radial surfaces 4c. The coil end portion of the second coil 4 has a bent portion 5 that is bent radially outward at a position between the plurality of first coils 3 . By doing so, it is possible to provide a stator for a rotating electrical machine that can be welded without reducing insulation performance.

(2) The coil end portion of the first coil 3 includes two first radial surfaces 3c, two first circumferential surfaces 3a, and a first axial surface 3b adjacent to each other. The coil end portion of the second coil 4 has a second axial surface 4b adjacent to two second radial surfaces 4c, an external inclined surface 4D opposite to the internal inclined surface 4d, and a second circumferential surface 4a. Equipped with. By doing this, it is possible to determine the axial plane for welding the coils together.

(3) A plurality of coils 1 are inserted into an annular core 2 having a plurality of slots 2a in the circumferential direction. The inserted plurality of coils 1 include a first coil 3 that extends along the axial direction from the end surface of the core 2, and a first coil 3 that extends from the end surface of the core 2 and is inclined in the circumferential direction with respect to the axial direction. 2 coils 4. When welding and fixing the coil end portion of the first coil 3 and the coil end portion of the second coil 4 to each other, two first circumferential surfaces 3a facing each other in the circumferential direction at the coil end portion of the first coil 3; Among the two opposing

inclined surfaces

4D and 4d between the two second radial surfaces 4c that face each other in the radial direction in the second coil 4, an external inclined surface 4D that does not face the core 2 side and an external inclined surface The jig 7 grips the inner side inclined surface 4d facing 4D and the second circumferential surface 4a adjacent to the two second radial surfaces 4c. By adopting such a manufacturing method, it is possible to manufacture a stator for a rotating electric machine that can be welded without reducing insulation performance.

Note that the present invention is not limited to the above-described embodiments, and various modifications and other configurations can be combined without departing from the scope of the invention. Furthermore, the present invention is not limited to having all the configurations described in the above embodiments, but also includes configurations in which some of the configurations are deleted.

1 Coil

1a Coil contact

1b Coil chuck 2 Stator core 2a Slot 3 Straight coil (first coil)
3a First circumferential surface 3b First axial surface 3c First radial surface 4 Diagonal coil (second coil)
4a Second circumferential surface 4b Second axial surface 4c Second radial surface 4D External inclined surface 4d Internal inclined surface 5 Bent part 6 Welded part 7 Gripping jig 10 Stator of rotating electric machine

Claims

an annular core having a plurality of slots in the circumferential direction;
A plurality of coils each having a plurality of straight portions provided along the radial direction of the plurality of slots, and coil end portions extending from both ends of the straight portions to the outside of the core. A stator for a rotating electric machine,
The plurality of coils include a first coil extending along the axial direction from an end surface of the core, and a second coil extending from the end surface of the core and inclined in the circumferential direction with respect to the axial direction. and,
The coil end portion of the first coil includes two first radial surfaces facing each other in the radial direction and two first circumferential surfaces facing each other in the circumferential direction,
The coil end portion of the second coil includes two second radial surfaces facing each other in the radial direction, two inclined surfaces facing each other between the two second radial surfaces, and two inclined surfaces. an inner inclined surface facing the core side and a second circumferential surface adjacent to the two second radial surfaces;
The coil end portion of the second coil has a bent portion that is bent radially outward at a position between the plurality of first coils. The stator of a rotating electric machine.
A stator for a rotating electrical machine according to claim 1,
The coil end portion of the first coil includes a first axial surface adjacent to the two first radial surfaces and the two first circumferential surfaces,
The coil end portion of the second coil has a second axial surface adjacent to the two second radial surfaces, an external inclined surface opposite to the internal inclined surface, and the second circumferential surface. Equipped with a stator for rotating electric machines.
Multiple coils are inserted into an annular core with multiple slots in the circumferential direction,
The plurality of inserted coils include a first coil extending along the axial direction from the end surface of the core, and a first coil extending from the end surface of the core and inclined in the circumferential direction with respect to the axial direction. a second coil;
When welding and fixing the coil end portion of the first coil and the coil end portion of the second coil to each other, two first circumferential surfaces facing in the circumferential direction at the coil end portion of the first coil; Of the two radially opposed second radial surfaces in the second coil, the outer slanted surface does not face the core side, and the inner slanted surface faces the outer slanted surface. A method for manufacturing a stator for a rotating electric machine, comprising: gripping a side inclined surface and a second circumferential surface adjacent to the two second radial surfaces using a jig.