JPH0937491A - Induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the adhesion of the coupling parts of iron cores so as to improve magnetic efficiency by providing an extension low in magnetic density at the engaging part, and coupling both split iron cores by spring force. SOLUTION: This induction motor has teeth 3 on the inside diameter side of stator iron cores 1 halved at a division face, and also extensions 4 are made outward in radial direction along the division face 2. The extension 4 is tapered, and is provided with a constriction at the base, and further are provided with a recess 5a and a projection 6b to engage with each other at the junction face. After insulation by an insulator and application of winding, the recesses 6a and 6b are engaged and joined with each other, and are fixed by a plate spring 9. The tip of the plate spring 9 catches in the constriction, and can be united by resin together with a stator as it is. Hereby, the reluctance can be reduced sharply, and positioning and engagement can be performed easily, and a danger of deteriorating the stator by welding, etc., can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction motor.

[0002]

2. Description of the Related Art As shown in FIG. 6, a stator core of an induction motor, which is composed of a plurality of divided iron cores, has a dufftail-shaped projection and a recess 11a in a core back portion for coupling the divided iron cores. , 11b are formed, or as shown in FIG. 5, the extending portion 4 extends radially outward of the dividing surface.
Was provided and the tip portion thereof was welded 10 to be joined to form the stator core.

[0003]

However, in the method of FIG. 6, since it is difficult to closely attach the joint portion and a gap is apt to be generated between the two divided surfaces, the magnetic resistance is increased, and the inner diameter of the stator core is reduced. There is a problem that it is difficult to increase the circularity and unevenness is likely to occur in the gap with the rotor. Further, the method shown in FIG. 5 has a problem that a gap is likely to be formed in the joint portion 2 due to shrinkage during welding. In any of the methods, since the magnetic flux density of the iron core is high at the joint portion, there is a problem that a slight air gap generated at the joint portion has a large influence, and the magnetic efficiency is greatly reduced.

An object of the present invention is to improve the magnetic efficiency by measuring the close contact between the joint portions of the iron core.

[0005]

According to the present invention, a tooth portion is formed on the inner diameter side of an iron core and an extending portion is formed to extend radially outward of the position of the tooth portion, and the tip of the extending portion is formed. And a constricted part at the base part, the stator core is divided into a plurality of parts by the dividing surface penetrating the extension part and the tooth part, and the recessed part and the protrusion part which are fitted to each other are provided on the dividing surface located at the extension part. The problem is solved by mounting a member having a spring action, which is joined at a split surface after the winding, to the constricted portion to be joined.

[0006]

Since the fitting portion is provided in the extension portion having a low magnetic flux density, the magnetic efficiency does not decrease.

Further, since the split iron cores are connected by the spring force, an excessive force is not applied, so that the performance is not deteriorated due to the deterioration of accuracy.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a diagram showing the shape of the stator core of the present invention, FIG. 2 is an enlarged view of the essential parts of the connecting portion, FIG. 3 is the stator after winding and joining, and FIG. 4 is the connecting portion. It is an enlarged view of a main part. In the figure, 1 is a stator core divided into two parts by a dividing surface 2,
An extending portion 4 having teeth 3 on the inner diameter side and extending radially outward along the dividing surface 2 is formed. The extended portion 4 has a thin tip, a constricted portion 5 is provided at the base portion, and a concave portion 6a and a protruding portion 6 which are fitted to each other on the joint surface.
b is provided. As shown in FIG. 3, the iron cores are insulated from each other by the insulator 7 and the windings 8 are applied thereto, and then the recesses 6a and the protrusions 6b are fitted to each other to perform positioning and joining, and then, as shown in FIG. As shown in FIG. 4, the fixing is performed by the U-shaped leaf spring 9. The tip of the leaf spring 9 is caught in the constricted portion 5 so as not to fall off, and can be integrally molded with resin as it is together with the stator.

In the present embodiment, since the positioning recess and protrusion are provided in the extension having a low magnetic flux density, the magnetic resistance can be greatly reduced. Further, there is no risk of deterioration of the wound stator due to welding or the like. Further, positioning and coupling can be easily performed without requiring any special process.

[0011]

According to the present invention, it is possible to obtain a split iron core type induction motor in which the split iron cores can be simply coupled, the magnetic loss is small, and the cost is low.

[Brief description of drawings]

FIG. 1 is a front view showing the shape of a stator core of the present invention.

FIG. 2 is an enlarged view of a main part showing a connecting portion of FIG.

FIG. 3 is a front view showing the shape of a stator after winding of the present invention.

FIG. 4 is an enlarged view of an essential part showing a connecting portion of FIG.

FIG. 5 is an explanatory view showing a shape of a connecting portion of a conventional stator core.

FIG. 6 is an explanatory view showing a shape of a connecting portion of a conventional stator core.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Iron core, 2 ... Joining surface, 3 ... Tooth, 4 ... Extension part, 5 ... Constriction part, 6a, 6b ... Recessed part and protrusion part, 9 ... Leaf spring.

Claims (1)

[Claims] 1. A tooth portion is formed on an inner diameter side of an iron core to form an extending portion extending radially outward of a position of the tooth portion, a tip of the extending portion is thinned, and a neck portion is formed at a base portion. Is provided
The stator core is divided into a plurality of parts by a dividing surface that penetrates the extending portion and the tooth portion, and a concave portion and a protruding portion that fit with each other are provided on the dividing surface located at the extending portion, and the winding surface is joined at the dividing surface after winding. An induction motor characterized in that a member having a spring action is mounted and coupled to the constricted portion.