JPS60170445A - Manufacturing method of electric motor stator - Google Patents

Abstract

PURPOSE:To machine in simple steps without machining chips by coupling pole shoes with several sheets of upper and lower cores, press-fitting them to a stator yoke and then separating and bending the coupled portion only at one side. CONSTITUTION:A pole 1a of laminated structure that several sheets of upper and lower core plates 1a', 1a'' is composed, and the pole is press-fitted to a stator yoke. Then, only the one side of the coupled portion of the plates 1a', 1a'' is separated and simultaneously bent to form an air gap (a).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a motor stator having a structure in which a plurality of magnetic poles are fixed to a yoke.

Configuration of the conventional example and its problem 2 The inventors of the present invention have previously made many efforts to increase the efficiency of the electric motor. In other words, we succeeded in reducing leakage magnetic flux by creating a structure in which a gap is provided between the connecting parts of the pole shoes provided at the tips of adjacent magnetic poles.

Regarding the method of creating the above-mentioned air gap, the connecting parts of adjacent pole shoes are separated in advance during core punching to create an air gap, the cores are stacked to form a magnetic pole, and then the winding wire is wound. After the winding frame was fitted onto each magnetic pole, the winding frame was press-fitted into the stator yoke to form the stator.

However, with this method, since each magnetic pole is separated from each other, the work of installing the winding and press-fitting it to the stator yoke is very inefficient, and the arc-shaped pole shoe after press-fitting is still There was also a problem in that it was difficult to obtain the precision of the rotor insertion hole that was formed.

In addition, in order to solve the above-mentioned problems, as shown in FIG. After fitting the windings and press-fitting them into the stator yoke, the iron core plates ai and a2 are cut by post-processing (pressing or polishing). However, when the connecting parts are punched out using a press, it is troublesome to dispose of the punched metal pieces, and if the cutting is done by polishing, the metal powder from the polishing may be left between the windings. Problems have always occurred when metal powder gets stuck in the stator and causes a short circuit, or when the stator becomes magnetized during polishing and metal powder adheres to it.

Purpose of the Invention The present invention takes into account the above-mentioned problems and provides a method for manufacturing an electric motor stator in which post-processing of voids can be performed in a simple process without generating processing waste (metal pieces or metal powder). The purpose is to

Structure of the Invention In order to achieve the above object, the present invention includes a step of connecting adjacent pole shoes with several pieces above and below a core, and then press-fitting and fixing them to a stator yoke, and separating and bending only one side of the connected part by a press. A method of manufacturing an electric motor stator includes steps.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

2, 1a, 1b, 1c, 1. d is the magnetic pole of the stator core with a pole shoe at the tip; a.

b, c, and d are air gap portions provided at the mutually connected portions of the pole jaw tips of each magnetic pole; 2 is a stator yoke; 3a, 3b, 3c, and 3d are respective magnetic poles 1a, 1b,
The stator windings 1c and 1d are wound, and 4 indicates the winding frame of this winding.

In the electric motor shown in FIG. 2, windings 3a, 3b, 3c, and 3d are wound around the magnetic poles 1a, 1b, 1c1d, respectively, and then press-fitted into the stator yaw 2 to form a stator.

In the stator structure constructed as described above, there are gaps a, b, and c at the connecting portions of adjacent pole shoes.

Providing d has the advantage that leakage magnetic flux flowing through this portion is reduced and the efficiency of the motor is increased.

5., -1 Fig. 4 shows a partial view of the magnetic pole part of a stator made according to an embodiment of the present invention, and the iron core plate 1a', which has only a few pieces of iron core plates 1a' as shown in Fig. 3, This is because the magnetic pole 1a, which has a laminated structure connected by 1g", is not intended to form a gap a by separating only one side of the connecting portion of the iron core plates 1a' and 1a" by press working and simultaneously bending it. , it is possible to provide an excellent method for forming a stator, which does not generate processing waste (metal chips or metal powder) and is easy to process, requiring fewer processing steps and reducing costs.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the stator, which is the premise of the present invention;
The figure is a configuration diagram of the stator of the induction motor of the present invention, Figure 3 is a partial view showing the shape of the connecting part of adjacent pole shoes of the same stator before post-processing, and Figure 4 is the shape after post-processing. FIG. 1a 1b, 1c, 1d--Magnetic poles, a, b, c. d...Gap, 2...Yoke, 3a, 3
b, 3c. 6,,-7 3d... Winding wire, 4... Winding frame. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
Figure 4

Claims (1)

[Claims] a stator yoke; a stator yoke fixed to the stator yoke and protruding inward from the stator yoke;
Moreover, it is equipped with a pole shoe on the inner periphery, a plurality of magnetic poles made of a laminated structure of a plurality of cores, and a stator winding wound around the magnetic poles. It is characterized by having a step of connecting several upper and lower cores and then press-fitting and fixing them to the stator yoke, and a step of separating and bending only one side of the connecting portion by press working the connecting portion of the upper and lower several cores. A method for manufacturing an electric motor stator.