JPH05316694A - Manufacture of motor stator - Google Patents

Abstract

PURPOSE:To firmly couple an outer ring core with a magnetic core without needing a recess for engagement and a projection for insertion for the magnetic core and the outer wheel core. CONSTITUTION:This stator is equipped with a circular magnetic pole core 2 where winding is applied according to the number of windings, an outer ring core 1 separate from the magnetic pole, and a frame provided around the magnetic pole core 1, and outer wheel 1 is fastened and fixed to the magnetic pole core 2 by the shrink fitting of the frame 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an electric motor in which a magnetic pole core and an outer ring core are joined together.

[0002]

2. Description of the Related Art Generally, in the stator of this type of electric motor, when the magnetic pole core and the outer ring core are integrally molded, the outer ring core becomes an obstacle when winding the magnetic pole core, which makes the winding work complicated. Therefore, a structure is adopted in which the magnetic pole core and the outer ring core are separately configured, and the magnetic pole core is wound and then the magnetic pole core is coupled to the outer ring core. A conventional structure for coupling a magnetic pole core to an outer ring core is disclosed in JP-A-63-2.
As disclosed in Japanese Patent No. 99737, an outer ring core is provided with a dovetail groove-shaped fitting concave portion, an insertion convex portion that is fitted into the fitting concave portion is provided on the magnetic pole core, and the magnetic pole core is inserted into the fitting concave portion of the outer ring core. It has a structure in which the convex portions are press-fitted to be joined.

[0003]

Since the stator of the conventional electric motor has the above-described structure, it is necessary to control the size of the press-fitting portion with high accuracy, and the magnetic pole is provided in the fitting recess of the outer ring core. A large pressing force was required because the insertion protrusion of the core had to be press-fitted. The present invention has been made to solve such a conventional problem, and an object thereof is to firmly couple the outer ring core and the magnetic pole core without the need for dimensional control of the press-fitting portion.

[0004]

In an electric motor stator in which an annular magnetic pole core having windings according to the number of poles and an outer ring core separate from the magnetic pole core are coupled, the magnetic pole core is inside the outer ring core. The frame is inserted into the circumference, and the frame is fastened to the outer circumference of the outer ring core by shrink fitting.

[0005]

Therefore, the frame contracts to contract the outer ring core, and the outer ring core can be closely attached to the magnetic pole cores.

[0006]

EXAMPLE An example of the present invention will be described with reference to FIG. A stator of an electric motor includes a cylindrical outer ring core 1 formed by stacking thin plates such as electromagnetic steel plates, and a magnetic pole core 2 formed by stacking electromagnetic steel plates and the like fitted and fixed to the outer ring core 1. . The outer ring core 1 is formed by laminating a plurality of ring-shaped thin plates, and the magnetic pole core 2 has a slot 3 for mounting a winding, which is open to the outer peripheral side. A frame 4 is provided on the outer periphery of the outer ring core. The inner diameter of this frame is smaller than the outer diameter of the outer ring core. When manufacturing a stator of an electric motor, the magnetic pole core is inserted into a jig (not shown) that is approximately equal to the inner diameter of the magnetic pole core, the outer ring core is fitted around the outer circumference of the magnetic pole core, and then the frame is shrunk to form the magnetic pole core and outer ring core. Is fixed by the frame. After cooling, the frame is fitted with the outer ring core by interference fitting to push the outer ring core inward, and the frame and the outer ring core are fastened and the outer ring core and the magnetic pole core are fastened at the same time.

[0007]

As described above, according to the present invention, the magnetic pole core and the outer ring core can be firmly and tightly coupled without providing the magnetic pole core and the outer ring core with fitting portions.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor stator showing an embodiment of the present invention.

[Explanation of symbols]

 1 Outer ring core 2 Magnetic pole core 3 Slot 4 Frame

Claims (1)

[Claims] 1. A method of manufacturing an electric motor stator comprising an annular magnetic pole core having windings according to the number of poles and an outer ring core separate from the magnetic pole core, wherein the magnetic pole core is provided inside the outer ring core. A method of manufacturing an electric motor stator, wherein the frame is inserted and the frame is fastened to the outer periphery of the outer ring core by shrink fitting.