JP2000324740A - Stator of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the insulation performance between the windings of neighboring unit stators by enveloping the winding of the unit stator with an insulator. SOLUTION: In the stator of a motor where the unit stators 10 retaining windings 2 on the unit stacked iron cores 1 forming pole teeth are made in circular form by a specified number of pieces, the winding 2 of each unit stator 10 is so covered with an insulator as to envelop it. Here, a flexible foil-form one such as insulating paper is used for the insulator 3, and also a resin insulator can also be used jointly. As a result, the stable operation of the motor, which does not cause insulation breakage between each and the next of the windings 2 of neighboring unit stators 10, becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor, and more particularly, to a unit fixed in which a winding is held on a unit laminated iron core corresponding to a pole tooth, which is widely used for an AC servomotor or a pulse motor. The present invention relates to an improvement of an electric motor stator having a stator formed in a ring shape.

[0002]

2. Description of the Related Art Conventionally, a stator in which unitary (split) stators in which windings are wound in accordance with polar teeth is formed in a ring shape enables high-density aligned windings to increase motor efficiency. And its manufacturing method, for example, as disclosed in JP-A-6-105487, JP-A-6-311675, JP-A-7-7875 or JP-A-7-298522. Many suggestions have been made.

[0003]

However, in these conventional stators, the insulation between the windings of adjacent unit stators is not always sufficient, and often the insulation between the windings of adjacent unit stators is not sufficient. This caused insulation breakdown, which was a major cause of motor trouble. The present invention has been made in view of such a problem.

[0004]

As a means for solving the above-mentioned problems, the present invention provides a stator for an electric motor in which a unit stator in which windings are held in a unit laminated iron core corresponding to pole teeth is formed in an annular shape. Wherein the winding of the unit stator is enveloped by an insulator.

[0005] Thereby, the insulation performance between the windings of adjacent unit stators can be improved, and the trouble due to insulation breakdown can be eliminated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing preferred embodiments. FIG. 1 is a schematic cross-sectional view of an electric motor including one embodiment of a stator according to the present invention, FIG. 2 (a) is a view taken along line XX of FIG. 1, and FIG.
It is a partial bottom view of (a).

In each of the figures, 1 is a unit laminated core formed by laminating substantially T-shaped steel plates to form pole teeth, and 2 is a winding wound around the unit laminated core 1. Here, the unit stator including the unit laminated iron core 1 and the windings 2 and an insulating part described later is used.
Ten. As shown, the required number of unit stators 10 are formed in a ring shape to constitute a stator of the electric motor. This annular configuration method may employ any known means. Reference numeral 20 denotes a rotor provided rotatably concentrically with the stator.

Here, reference numeral 3 denotes a flexible foil-shaped insulator such as insulating paper, which faces the laminated core 1 of the winding 2.
Surfaces, 2a, 2b, 2c surfaces and the outer 2d surface. In general, the insulation of the laminated core 1 and the windings 2 is performed by resin coating or impregnation with resin, but the stator of the present invention can also be used with resin insulation.

Since the stator of the present invention covers the winding 2 of the unit stator 10 so as to enclose the winding, the adjacent unit stators are covered.
Insulation breakdown of each winding 2 between 10 does not occur, and stable operation of the motor becomes possible.

[0010] The method of wrapping the windings with the insulator is not limited to the method in which the insulator is overlapped on the outer surface 2d as shown in FIG. 1, but may be overlapped on the inner surface 2c as shown in FIG. (FIG. 3 (a)), and it can also be superposed on the inner diameter side of the outer 2d surface (FIG. 3 (b)), and an appropriate form can be adopted as necessary.
Although a flexible foil-shaped insulating paper has been described as an insulator, an insulating film may be used as long as it can take a shape as shown in the figure without necessarily having flexibility. good.

[0011]

According to the present invention, there is provided a stator for an electric motor in which a unit stator having windings held on a unit laminated iron core corresponding to pole teeth is formed in an annular shape. Since the envelope is surrounded by the insulator, dielectric breakdown of each winding between the unit stators does not occur, and stable operation of the electric motor is possible.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an electric motor including one embodiment of the present invention.

2 (a) is a view taken in the direction of arrows XX in FIG. 1, and FIG. 2 (b) is a view in FIG.
It is a partial bottom view of (a).

FIGS. 3A and 3B are partial cross-sectional views of another embodiment of the present invention.

[Explanation of symbols]

 1 Unit laminated iron core 2 Winding 3 Insulator 10 Unit stator 20 Rotor

Claims (2)

[Claims] 1. A stator for an electric motor in which a unit stator in which windings are held in unit laminated iron cores corresponding to pole teeth is formed in an annular shape, wherein the windings of the unit stator are enveloped by an insulator. A motor stator. 2. The motor stator according to claim 1, wherein said insulator is a flexible foil-shaped insulator.