JP4290998B2 - Manufacturing method of rotating electrical machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminated core applied to a stator of a rotating electric machine such as an electric motor, and more particularly to a method of manufacturing a rotating electric machine for reducing cogging torque.
[0002]
[Prior art]
Generally, in conventional iron cores of rotating electrical machines, cogging torque is generated due to the slot opening between the tips of the magnetic pole teeth around which the coil is wound. Therefore, the slot harmonics are suppressed by closing the tips of the magnetic pole teeth. The cogging torque is reduced (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-6-54468 (2nd page, FIG. 1)
[0004]
[Problems to be solved by the invention]
As described above, the conventional iron core of a rotating electrical machine closes the slot opening between the tips of the magnetic pole teeth in order to reduce the cogging torque. However, in the laminated iron core, each tee score piece to be laminated is formed by punching, so it is difficult to align all dimensions in the laminating direction, and if any one point abuts in the laminating direction between the tips of the magnetic pole teeth. Since the remaining tips cannot be brought into contact with each other, it is difficult to make contact between the tips of the magnetic pole teeth, and it is difficult to reduce the cogging torque.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method of manufacturing a rotating electrical machine capable of reducing cogging torque.
[0006]
[Means for Solving the Problems]
In the method of manufacturing a rotating electrical machine according to the present invention, the core members are formed by arranging a plurality of taste score pieces formed by projecting magnetic pole teeth on one side in a strip shape, and the respective taste score pieces adjacent to each other in the arrangement direction. A plurality of layers are stacked so that their edges overlap in the stacking direction of each of the above-mentioned respective score core pieces, and the edges of the above-mentioned each of the score core pieces are rotatably connected via a connecting means to form an annular shape. In a manufacturing method of a rotating electrical machine including a coil wound around a magnetic pole tee of each of the stacked core score pieces ,
A long protrusion and a short protrusion, each having a different length in the circumferential direction, are formed to protrude in the circumferential direction at both ends in the circumferential direction of the tip of the magnetic pole tee of each tee score piece, and at the tip of the long protrusion. Has a protrusion that gradually decreases in thickness toward the tip,
Each of the above-mentioned respective score scores is such that the long protruding portion and the short protruding portion are opposed to each other at each of the above-mentioned respective score core pieces adjacent to each other in the circumferential direction, and are adjacent to each other in the stacking direction. It is arranged so that it protrudes in the circumferential direction opposite to each other,
The coil is wound around the magnetic pole teeth in a state where the iron core, which is connected in a ring shape via the connecting means, is extended in the strip shape by releasing the connection of the connecting means at one place in the circumferential direction. In addition, the iron cores are connected in a ring shape, and the protrusions at the tips of the long protrusions of the respective score core pieces adjacent to each other in the stacking direction overlap each other .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a front view showing a configuration of an iron core of a rotary electric machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a configuration of a main part of the core of the rotary electric machine in FIG. 1, and FIG. 3 is a line III in FIG. FIG. 4 is a plan view showing a process of closing the tips of the magnetic pole teeth of the iron core of the rotating electric machine in FIG. 1, and FIG. 5 is a state between the tips of the magnetic pole teeth in each process shown in FIG. FIG.
[0008]
As shown in the figure, the iron core 1 of the rotating electrical machine is configured by alternately laminating a plurality of first and second core members 3 and 4 formed by annularly connecting a plurality of tee score pieces 2. Yes.
Then, as shown in FIG. 2, each tee score piece 2 is formed with concave and convex portions 5 and 6 as connecting means on one end side front and back surfaces, and the end surface 7 of the concave and convex portions 5 and 6 is formed. An end surface 8 that can be fitted to the end surface 7 of the adjacent score core piece 2 is formed on the other end side.
[0009]
Further, a magnetic pole tooth 9 protrudes from one side located inside the annular shape, and a long protruding portion 10 and a short protruding portion 11 having different lengths in the circumferential direction protrude from the tip thereof. Has been. As shown in FIGS. 4 and 5, a protrusion 12 protruding toward the short protrusion 11 of the adjacent magnetic pole teeth 9 is formed at the tip of the long protrusion 10 side. As shown in FIG. The chamfer 13 is made so as to become gradually thinner toward the end.
[0010]
For example, as shown in FIG. 2, the tee score piece 2 formed as described above is formed in a predetermined number of strips so that the end surfaces 7 on one end side and the end surface 8 on the other end side are adjacent to each other. 1st core member 3 is constituted by arranging. Further, the second core member 4 is configured by arranging the same number of strips so that the positions of one end side and the other end side of the tee score piece 2 are opposite to the first core member 3 in the circumferential direction. A predetermined number of layers are alternately laminated with the first core member 3, and the lamination is performed by squeezing the concave and convex portions 5 and 6 of both tee score pieces 2 adjacent to each other in the laminating direction. The first and second core members 3 and 4 are rotatably integrated with each other through the concave portions and the convex portions 5 and 6.
[0011]
Note that, between the tips of the magnetic pole teeth 9, that is, the slot openings, one long protrusion 10 adjacent to each other in the circumferential direction extends toward the other short protrusion 11, and the long protrusions adjacent to each other in the stacking direction. 10 are arranged so as to overlap each other and closed.
[0012]
As described above, according to the first embodiment, the long protrusions 10 and the short protrusions 11 having different lengths in the circumferential direction are formed at the tips of the magnetic pole teeth 9 so as to be adjacent to each other in the circumferential direction. The long projecting portion 10 is extended to the other short projecting portion 11 side so that the adjacent long projecting portions 10 overlap each other in the stacking direction. Even if not, the slot opening can be easily closed and the cogging torque can be reduced.
[0013]
The iron core 1 of the rotating electrical machine configured as described above is once cut off at a position indicated by * in FIG. 1, for example, and is extended linearly by rotating the concave and convex portions 5 and 6 as connecting means. In this state, after a coil (not shown) is wound, it is returned to the original annular shape again as shown in FIG. 1, but since the protruding portion 12 is formed at the tip of the long protruding portion 10, As shown in FIG. 5 (B), the protrusions 12 overlap each other, and the long protrusions 10 overlap as shown in FIG. 5 (C), so that the overlapping operation proceeds smoothly and is caught in the middle of the operation. Therefore, assembling becomes easy and improvement in assembling workability can be achieved.
[0014]
Further, since the protruding portion 12 is chamfered 13 so as to become gradually thinner toward the tip, the overlapping operation becomes smoother and the assembling workability is further improved.
Furthermore, although not described above, it is possible to obtain the same effect even when the protrusion 12 is thinly formed by chamfering instead of the chamfer 13, as well as each tee score piece 2. Since the punching process can be performed at the same time, the number of processing steps can be reduced and the cost can be reduced.
[0015]
Embodiment 2. FIG.
FIG. 6 is a cross-sectional view showing different structures of the iron core of the rotating electrical machine according to Embodiment 2 of the present invention.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0016]
In the second embodiment, the overlapping of the long protruding portions 10 of the respective tess score pieces 2 is, for example, as shown in FIG. As shown in FIG. 6 (C), the central portion and the intermediate portion in the stacking direction are respectively limited to a predetermined number of layers.
[0017]
As described above, according to the second embodiment, the region where the long protrusions 10 overlap each other is limited to a predetermined number of layers as shown in the figure, so that it is compared with the case where all the layers overlap each other. It is clear that the overlapping operation will be smooth, and it will be possible to improve the assembly workability, and there will be no trouble in reducing the cogging torque by adjusting the number of overlapping layers as appropriate. It is also possible.
[0018]
【The invention's effect】
As described above, according to the present invention, the core members are formed by arranging a plurality of taste score pieces formed by projecting the magnetic pole teeth on one side in a strip shape, and each of the taste score pieces adjacent to each other in the arrangement direction is formed. A plurality of layers are stacked so that their edges overlap in the stacking direction of each of the above-mentioned respective score core pieces, and the edges of each of the above-mentioned respective score core pieces are rotatably connected via a connecting means to form an annular shape. In a manufacturing method of a rotating electrical machine including a coil wound around a magnetic pole tee of each of the stacked core score pieces ,
A long protrusion and a short protrusion, each having a different length in the circumferential direction, are formed to protrude in the circumferential direction at both ends in the circumferential direction of the tip of the magnetic pole tee of each tee score piece, and at the tip of the long protrusion. Has a protrusion that gradually decreases in thickness toward the tip,
Each of the above-mentioned respective score scores is such that the long protruding portion and the short protruding portion are opposed to each other at each of the above-mentioned respective score core pieces adjacent to each other in the circumferential direction, and are adjacent to each other in the stacking direction. It is arranged so that it protrudes in the circumferential direction opposite to each other,
The coil is wound around the magnetic pole teeth in a state where the iron core, which is connected in a ring shape via the connecting means, is extended in the strip shape by releasing the connection of the connecting means at one place in the circumferential direction. Since the protrusions at the tips of the long protrusions of the respective score core pieces adjacent to each other in the stacking direction are connected in an annular shape, the rotating electric machine can be manufactured with reduced cogging torque. A method can be provided.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration of an iron core of a rotary electric machine according to Embodiment 1 of the present invention.
2 is a perspective view showing a configuration of a main part of an iron core of a rotating electrical machine in FIG. 1. FIG.
3 is a cross-sectional view showing a cross section taken along line III-III in FIG. 1;
4 is a plan view showing a step of closing between the tips of magnetic pole teeth of the iron core of the rotating electrical machine in FIG. 1. FIG.
5 is a partial front view showing a state between the tips of magnetic pole teeth in each step shown in FIG. 4;
FIG. 6 is a cross-sectional view showing different configurations of iron cores of a rotating electrical machine according to Embodiment 2 of the present invention.
[Explanation of symbols]
1 iron core, 2 tee score pieces, 3 first core member, 4 second core member,
5 concave portions, 6 convex portions, 7, 8 end faces, 9 magnetic pole teeth, 10 long protruding portions,
11 Short projection, 12 Projection, 13 Chamfer.

Claims (3)

A core member is formed by arranging a plurality of taste score pieces formed by projecting magnetic pole teeth on one side in a strip shape, and the edges of the respective taste score pieces adjacent to each other in the arrangement direction are A plurality of layers are stacked so as to overlap with each other in the stacking direction, and the edges of the above-described each of the score core pieces are rotatably connected via a connecting means to form an annular core and the stacked each of the score core pieces. In a method of manufacturing a rotating electrical machine having a coil wound around a magnetic pole tee ,
A long protrusion and a short protrusion, each having a different length in the circumferential direction, are formed to protrude in the circumferential direction at both ends in the circumferential direction of the tip of the magnetic pole tee of each tee score piece, and at the tip of the long protrusion. Has a protrusion that gradually decreases in thickness toward the tip,
Each of the above-mentioned respective score scores is such that the long protruding portion and the short protruding portion are opposed to each other at each of the above-mentioned respective score core pieces adjacent to each other in the circumferential direction, and are adjacent to each other in the stacking direction. It is arranged so that it protrudes in the circumferential direction opposite to each other,
The coil is wound around the magnetic pole teeth in a state where the iron core, which is connected in a ring shape via the connecting means, is extended in the strip shape by releasing the connection of the connecting means at one place in the circumferential direction. A method of manufacturing a rotating electrical machine, characterized in that the iron cores are connected in a ring shape and the protruding portions at the tips of the long protruding portions of the respective taste score pieces adjacent to each other in the stacking direction overlap each other. The protrusions at the leading ends of the long protrusions of the respective taste score pieces adjacent to each other in the stacking direction overlap each other in a predetermined number of layers of the total number of the score core pieces. Item 2. A method for manufacturing a rotating electrical machine according to Item 1. Each tee score piece is formed by punching from an iron plate of the material, and the protrusion at the tip of the long protrusion is formed so that its thickness gradually decreases toward the tip by surface punching performed simultaneously with the punching. The manufacturing method of the rotary electric machine of Claim 1 or 2 characterized by the above-mentioned.

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