JP3463490B2 - Rotating electric machine stator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved structure for a stator of a rotary electric machine such as a motor used mainly in industrial equipment such as robots.

[0002]

2. Description of the Related Art Conventionally, there has been known a structure of a stator in which winding density is increased by winding a laminated iron core divided in a circumferential direction for the purpose of downsizing a motor and increasing output. . For example, Japanese Patent Application Laid-Open No. 7-007875 (hereinafter referred to as prior art) discloses a structure of a stator of this type of rotating electric machine. That is, the stator described in the publication is
Iron plates that are divided into pole teeth units and have concave and convex fitting portions on the divided surfaces are welded by multiple laser welding to form a laminated core, and after winding the laminated core, the irregularities are fitted together and combined. The fitting portion is fixed to the cylindrical shape by laser welding.

[0003]

However, in the stator of the rotating electric machine of the above-mentioned prior art, since the adjacent laminated iron cores are fixed by laser welding, an expensive laser welding facility is required for assembling the stator. There was a problem that On the other hand, although the fitting portion can be fixed by adhesion, there is a problem that the adhesion is inferior in reliability in terms of strength and durability to the case of welding.

The present invention solves the above-mentioned problems (problems) of the prior art, and provides a small and high-power rotary electric machine with a high winding density without using expensive equipment and with the same degree of reliability as welding. It is an object of the present invention to provide a stator of a rotating electric machine that can be configured with good properties.

[0005]

In order to solve the above-mentioned problems, a stator of a rotary electric machine according to the present invention has a plurality of laminated iron cores divided in the circumferential direction for each pole tooth unit in a direction orthogonal to the pole teeth. A plurality of laminated iron cores are combined in a cylindrical shape, and a protrusion formed on one end of the outer peripheral portion of the laminated iron core in the circumferential direction is a recess formed on the other end of the outer peripheral portion of the adjacent laminated iron core. , And the outer pieces of the recess were caulked in the inner circumferential direction to fix the laminated cores to each other. in this case,
The laminated iron core can be formed by laminating and caulking a plurality of iron plates each having a protrusion at one end and a recess at the other end. The outer peripheral portion of the laminated iron core has a main fitting portion on the outer peripheral side and a sub-fitting portion on the inner peripheral side, and the outer piece of the main concave portion forming the main fitting portion is arranged in the inner peripheral direction. It is desirable that the plurality of laminated cores be fixed to each other by tightening.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a stator for a rotary electric machine according to the present invention will be described below. FIG. 1 is a plan view of a stator according to the present embodiment when it is completed, FIG. 2 is a plan view showing a laminated iron core alone, and FIG. 3 is an explanatory view showing work at the time of fixing.

In each drawing, reference numeral 1 denotes a stator, which is provided with a plurality of laminated iron cores 11 which are divided in the circumferential direction in units of pole teeth, in this example, 12 pieces. The individual laminated iron cores 11 are shown in FIG.
As shown in FIG. 5, the pole tooth portion 18 and the outer peripheral portion 12 that is continuous by connecting the intermediate portion to one end of the pole tooth portion 18 are provided, and the pole tooth portion 18 is formed in a substantially T-shape as a whole. This laminated iron core 11
2 is obtained by laminating iron plates having the same shape as the plane shape shown in FIG. 2 in units of pole teeth and fixing the caulking holes 17 formed in the pole teeth portion 18 by caulking the pole teeth portion 18 to an insulating layer. 1
4 is formed. Each laminated iron core 1 formed
The winding 13 is wound around the pole tooth 18 of No. 1 by a winding machine in high density and in an aligned state.

The outer peripheral portion 12 of the laminated iron core 11 has a main fitting portion 12S on the outer peripheral side and a sub fitting portion 12H on the inner peripheral side.
Is equipped with. The main fitting portion 12S on the outer peripheral side is formed so as to project to the left side in FIG. 2, and has a main projection 15 having a narrowed outer peripheral end and a wide tip, and a main projection on an extension line of the pole tooth portion 18. A main recess 16 is provided at a position opposite to the portion 15. The main recess 16 has an outer piece 16a and an inner piece 16b. On the other hand, the sub-fitting portion 12H on the inner peripheral side is composed of a sub-recess 20 formed inside the main protrusion 15 and a sub-projection 21 formed at the tip of the inner piece 16b of the main recess 16. .

At the time of assembly, the laminated iron cores 11, 11, ... As constructed above are arranged so as to be combined in a cylindrical shape, and the main and auxiliary fitting portions 12S of the adjacent laminated iron cores 11, 11 ,. , 12H are positioned so as to engage with the respective recesses, and as shown in FIG. 3, the outer piece 16a of the main recess 16 is pressed from the outer peripheral side to the inner side by applying a load P with the caulking tool 19 to form the outer piece. The tip of 16a is bent and engaged with the constriction of the main protrusion 15. This work is performed on each of 12 laminated cores 11
To construct a monolithic stator.

According to the above construction, the winding density can be increased to about 70% which is a theoretical limit value.
Further, since each laminated iron core is connected on the outer peripheral side, it is not necessary to form a continuous portion between the pole tooth portions unlike the conventional stator that is connected by the pole tooth portions, and the efficiency of the rotating electric machine is 5 to 10%. Can be improved. Further, by subdividing the iron core, an iron plate forming a laminated iron core can be produced with a small press facility, and the production efficiency can be remarkably improved. Further, since the laminated cores can be connected by caulking the outer piece 16a of the main recessed portion 16, it is possible to realize an integral structure having a required stator rigidity without using conventional laser welding, which is expensive. No special laser welding equipment is required.

[0011]

Since the stator of the rotary electric machine of the present invention is constructed as described above, it has the following excellent effects. (1) Since the laminated iron cores can be connected by crimping the outer piece of the recess, it is possible to realize an integral structure having a required stator rigidity without using laser welding as in the conventional case. (2) A small-sized, high-output rotating electric machine having a high winding density can be configured without using expensive laser welding equipment as in the past and with the same degree of reliability as welding. (3) As a result, the manufacturing cost of the stator of the rotating electric machine can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a stator of a rotary electric machine according to an embodiment of the present invention when it is completed.

FIG. 2 is a plan view showing the laminated core of FIG. 1 alone.

FIG. 3 is an explanatory view showing a work at the time of fixing the laminated core of FIG.

[Explanation of symbols]

1: Stator 11: laminated iron core 12: Outer periphery 12S: Main fitting part 12H: Sub fitting part 13: Winding 15: Main protrusion 16: Main recess 16a: outer piece 18: pole teeth

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Claims (3)

(57) [Claims] 1. A winding is applied to a plurality of laminated cores divided in the circumferential direction for each pole tooth unit in a direction orthogonal to the pole teeth to combine the plurality of laminated cores into a cylindrical shape, and the laminated cores A protrusion formed on one end of the outer peripheral portion in the circumferential direction is fitted into a recess formed on the other end of the outer peripheral portion of an adjacent laminated core, and the outer piece of the concave portion is caulked in the inner peripheral direction to form the laminated core. A stator for a rotating electric machine, characterized in that they are fixed to each other. 2. The laminated iron core is formed by laminating and caulking a plurality of iron plates having one end formed with the protrusion and the other end formed with the recess.
The stator of the rotating electric machine according to 1. 3. The outer peripheral portion of the laminated iron core has a main fitting portion on an outer peripheral side and a sub-fitting portion on an inner peripheral side, and an outer peripheral piece of a main concave portion forming the main fitting portion is inner peripherally. The stator for a rotary electric machine according to claim 1, wherein the plurality of laminated iron cores are fixed to each other by swaging in a direction.