JPH1118334A - Stator of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency of a stator which is made by stacking in the axis direction, disc-like electric iron sheets having cutouts in the parts of the periphery. SOLUTION: A stator 1 of a rotating electrical machine is made by stacking in the axis direction electric iron sheets 4a, 4b which have been punched with one and the same trimming die and have recesses for winding in an inner part and have cutouts in parts of the periphery. When stacking, the electric iron sheets 4a, 4b are stacked with the cutouts 3 displaced in the circumferential direction by integer times of the pitch of the recesses. In an embodiment, there are four cutouts in the periphery, displaced by 45 deg.. The electric iron sheets 4a, 4b may be displaced, one or several at a time. By this method, a contact area between the stator 1 and a stator frame does not change but is decentralized. Therefore, the entire body of the stator 1 is cooled uniformly, and a cooling efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stator for a rotating electric machine.

[0002]

2. Description of the Related Art In a conventional example shown in FIGS. 3, 4 and 5, a stator 10 of a rotating electric machine has a groove 2 for winding on its inner periphery.
Electric steel plate 4 having a notch 3 in a part of a disk-shaped outer periphery
Are laminated in the axial direction. The notch 3 forms a plane in the axial direction, and the stator 10 is pressed into the stator frame 5 having the cooling fins 5a and the like. The notch 3 is provided in order to save the material of the electric iron plate 4 according to a degree that does not hinder the magnetic flux density of the stator 10 so much.

[0003]

In the above-mentioned prior art, the portion where the notch 3 of the stator 10 is surrounded by the stator frame 5 has no contact with the stator frame 5 and the cooling of the stator 10 is hindered. As a result, the temperature rises and exceeds the heat resistance limit of insulation. Further, the stator 10 having the notch 3 is non-cylindrical, and the cylindricity of the stator frame 5 is distorted.

An object of the present invention is to provide a stator for a rotating electric machine which can improve cooling of a stator formed by laminating an electric iron plate having a notch in a part of a disk-shaped outer periphery in an axial direction. .

[0005]

SUMMARY OF THE INVENTION A stator of a rotating electric machine according to the present invention is formed by axially laminating an electric iron plate having a groove for winding on an inner periphery and a cutout on a part of a disk-shaped outer periphery. In the stator of the rotating electric machine, the notch is displaced in the circumferential direction by an integral multiple of the pitch of the groove, and is laminated in the axial direction.

According to the stator of the rotating electric machine of the present invention, the notch is displaced in the circumferential direction by an integral multiple of the pitch of the groove and is laminated in the axial direction, so that the contact area between the stator and the stator frame is reduced. No change, but the contact area is dispersed. For this reason, the cooling of the stator is averaged as a whole and the cooling is improved.
Further, the stator is cylindrical as a whole, and there is no possibility that distortion occurs in the cylindricity of the stator frame.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. In the drawings, the parts denoted by the same reference numerals have substantially the same functions, and description thereof may be omitted. In the first embodiment shown in FIG. 1 and FIG.
Is formed by axially laminating electric iron plates 4a, 4b punched from the same die having a groove 2 for winding on the inner periphery and a notch 3 on a part of the outer periphery of a disk shape. . At this time,
The cutouts 3 of the electric iron plates 4a, 4b are displaced in the circumferential direction by an integral multiple of the pitch of the grooves and laminated in the axial direction. In the embodiment, there are four notches 3 on the electric iron plates 4a and 4b on the entire circumference, and they are displaced by 45 degrees. Electric iron plates 4a, 4b to be displaced
The unit of the number of sheets may be one or more. The stator frame is not shown.

According to the above embodiment, the electric iron plates 4a, 4a
Since the notch 3 of b is displaced in the circumferential direction by an integral multiple of the groove pitch and laminated in the axial direction, the contact area between the stator 1 and the stator frame does not change, but the contact portions are dispersed. For this reason, the cooling of the stator 1 is averaged as a whole, and the cooling is improved. In addition, the stator 1 is cylindrical as a whole, and there is no possibility that distortion occurs in the cylindricity of the stator frame.

In a so-called frameless structure in which brackets are directly attached to both ends of the stator 1 without using a stator frame, the outer peripheral area of the stator 1 is greatly increased, and cooling is greatly improved.

[0010]

According to the stator of the rotating electric machine of the present invention,
Since the notch of the electric iron plate is displaced in the circumferential direction by an integral multiple of the pitch of the groove and laminated in the axial direction, the cooling of the stator is averaged as a whole, and the cooling is improved. Further, when the stator frame is used, there is an effect that the stator is cylindrical as a whole and there is no possibility that distortion occurs in the cylindricity of the stator frame.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of a conventional example.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a front view in which a stator frame is attached to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Groove 3 Notch 4a Electric iron plate 4b Electric iron plate

Claims (1)

[Claims] 1. A stator for a rotating electrical machine in which an electric iron plate having a groove for winding on an inner periphery and a notch on a part of a disk-shaped outer periphery is laminated in an axial direction, the notch is formed by a pitch of the groove. A stator for a rotating electrical machine characterized in that the stator is laminated in the axial direction while being displaced in the circumferential direction by an integral multiple of.