JPS58198148A - Deformation prevention for stator core - Google Patents

Abstract

PURPOSE:To minimize the fall or twist of stator cores, by a method wherein stator cores are laminated in number integer multiple of two or more times as much as a required laminate thickness and heat-treated and are then divided into pieces each having the required laminate thickness. CONSTITUTION:Iron cores 1 are formed by means of blanking. The iron cores 1 have caulking projections 2, respectively, which fit with each other in blanking. The iron cores 1 are laminated, and the caulking projections 2 are fitted with each other and caulked to form a stator core 3. Then, the stator cores 3 are laminated in number integer multiple of two or more times as much as a required laminate thickness and heat-treated. After the heat treatment, the stator cores 3 are divided into pieces each having the required laminate thickness. The divided stator core 3 receives a winding to reach completion. According to this method,the twist of each core due to the heat treatment is absorbed by increasing the laminate thickness, so that the fall or twist of the stator iron cores is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing deformation of a stator core, and an object of the present invention is to reduce core collapse and twisting after heat treatment of a stator core.

When a conventional stator core is laminated to the required thickness and then heat-treated, each core will be twisted due to the heat treatment. Because the torsional interference of the core is transmitted to the entire
There was a problem with the core falling down and twisting.

The basic structure of the present invention is to stack iron cores formed by punching into layers [stator cores fixed by caulking are laminated to an integral multiple of twice or more of the required stacking thickness, heat-treated, and then It is characterized by being divided into thick sections.

With this configuration, the lamination thickness of the stator core during heat treatment is increased, so interference from twisting of each core is absorbed by the lamination thickness, reducing core collapse and torsion, and the required lamination thickness of the stator core after heat treatment. Since it is divided into two parts, no correction processing is required.

The present invention will be explained below based on the embodiments shown in the figures.
1) is an iron core formed by punching, and protrusions (2) for caulking that fit into each other during the punching are formed on the iron core. (3) is a stator core in which the iron cores (1) are laminated and the protrusions (2) for caulking are fitted and fixed by caulking; After laminating the layers, heat treatment is performed at 750°C to 800°C. After the heat treatment, the stator core (3) is divided into required thicknesses. The divided stator core (3) is completed by inserting the winding (4).

In the stator core manufactured in this way, the core (
The stator core (3) is laminated to an integral multiple of twice or more the required stacking thickness and fixed by caulking.
1) Each sheet is twisted individually, but since the stacking thickness is increased, the twisting of each sheet is absorbed by the stacking thickness, reducing the overall core collapse and twisting. Since the heat-treated stator core (3) is divided into parts each having the required thickness, no modification work is required after the heat treatment. Furthermore, since the stator core (3) is fixed by crimping by fitting the crimping protrusion (2) into the stator core (3), it can be easily divided. The required stacking thickness does not necessarily have to be divided into the same stacking thickness, and may be divided by changing the stacking thickness. Furthermore, stator core (3)
The stacking thickness before dividing should not exceed at most 5 to 6 times the required stacking thickness, so as not to cause the carp to fall over when it is caulked and fixed.

As described above, the present invention provides a stator core in which cores formed by punching are laminated and fixed by caulking, in which the stator cores are laminated to an integral multiple of twice or more the required stacking thickness and heat treated. After that, it is divided into the required thickness,
Twisting of each iron core due to heat treatment is absorbed by increasing the stacking thickness, and core collapse and twisting of the stator core are reduced. By dividing the stator core into the required stacking thickness, correction after heat treatment is possible. This has practical effects such as no machining required.

[Brief explanation of the drawing]

FIG. 1 is a front view of a stator core subjected to conventional heat treatment, FIG. 2 is a front view of a stator core showing an embodiment of the present invention, and FIG. 3 is a front view of a stator core showing an embodiment of the present invention, and FIG. Enlarged view of section, 4th
This figure is a front view of the electric motor in which the stator core of FIG. 2 is divided into required thicknesses and windings are inserted therein. (1)... Iron core, (3)... - Stator core Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a stator core in which cores formed by punching are laminated and fixed by caulking, the stator cores are laminated to an integral multiple of twice or more the required stacking thickness and heat-treated, then the required stacking thickness is A method for preventing deformation of a stator core, which is characterized by dividing it into thick sections.