JP2003061286A - Method of manufacturing stator, and motor using its stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator which enables the thinning of a motor by insulating the coil end of a stator coil. SOLUTION: An insulating sheet 1 is equipped integrally with a section 1a with insulates the inside of the coil mount of the slot 2a of a stacked iron core 2, a section 1b which covers the side of the coil, and a tab 1c which is projected above the level of the stacked iron core from this section 1b. It is the same as a conventional process to the point of bending the section 1b of the insulating sheet 1, thereby covering the wound coil, and subsequently the tabs 1c provided at right and left and top and bottom both ends are bent to insulate coil ends (coil at the end in stacking direction).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating structure of an electric motor mainly used in industrial machines and the like, and more particularly to an insulating structure of a stator having pole teeth with concentrated windings.

[0002]

2. Description of the Related Art In recent years, motors for industrial use have been required to have a small size and a high output. The stator core is divided and concentrated windings are wound around the pole teeth to form an annular joint. The space factor is improved to realize a small size and high output.

However, if the slot space factor of the winding body is improved, it becomes necessary to take measures against the insulation between the adjacent winding bodies as a new problem. Insulation between matching winding bodies was secured.

A conventional stator insulation structure will be described with reference to the drawings.

In FIGS. 2A and 2B, 21 is a laminated iron core, 22 is an insulating sheet, 23 is an insulating end plate, and 24 is a winding body. The laminated core 21 is provided with concave slot portions 21b on both sides of the pole tooth portion 21a. By attaching insulating end plates 23 to both end portions of the laminated iron core 21 and insulating sheets 22 on both side slot portions 21b, the laminated iron core 21 is formed. 21 is insulated. Then, the coil is concentratedly wound around the pole tooth portion 21a to form the winding body 24, and the protruding insulating sheet 22 is bent,
The straight part (slot part) of the winding body 24 was covered so as to be wrapped.

[0006]

However, in the above-mentioned conventional stator insulation structure, the insulation state of the coil end portion of the winding body is a bare state in which only the insulation film of the coil is exposed.
For this reason, it is necessary to ensure insulation from the part to be charged.

Therefore, in order to secure the distance between the coil end portion and the charged portion, it is necessary to lengthen the coil end portion or add an insulator between the winding body and the charged portion.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a stator capable of insulating the coil ends of the stator winding body to make the electric motor thinner.

[0009]

In order to solve the above-mentioned problems, the stator of the present invention is a stator in which concentrated winding is provided for each pole tooth portion of a laminated iron core. A winding step of winding the coil around the pole tooth portion after insulating the piece, and an insulating step of bending the insulating sheet used for the insulating treatment to insulate the linear portion and the coil end portion of the winding body,
And an assembling step of annularly joining the laminated core pieces that have undergone the insulating step.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problems, the invention according to claim 1 is a laminated iron core piece which is divided and laminated in units of pole teeth in a stator for performing concentrated winding for each pole tooth portion of the laminated iron core. After the insulation process, the coil is wound around the pole teeth, and the insulation sheet used for the insulation process is bent to insulate the linear part and coil end part of the winding body. It is a manufacturing method of a stator provided with the assembly process which joins a lamination iron core piece annularly, and can insulate a to-be-charged part and a coil end part.

According to a second aspect of the present invention, in the insulating step, the linear portion of the winding body is covered by the first bending, and the coil end portion of the winding body is covered by the second bending. Different surfaces of the linear portion and the coil end portion can be covered with one insulating sheet.

According to a third aspect of the present invention, in a motor provided with a stator having concentrated windings on the pole teeth of the laminated core, both sides of the pole teeth of the laminated core piece divided and laminated in units of pole teeth are provided. An insulating sheet for axially covering the concave slot portion formed in the above is provided, and the linear portion of the winding body and the coil end portion are insulated by the insulating sheet.

Further, the invention according to claim 4 is characterized in that the insulating sheet has tabs projecting from the laminated thickness of the laminated core at the ends thereof.
Since this tab is bent to cover the coil end, the winding body can be insulated without the need for a new insulating component. In particular, the axial insulation distance between the coil end portion and the charged portion can be shortened. Therefore, the electric motor can be made thin.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 (a) and 1 (b), 1 is an insulating sheet and 2 is a laminated iron core having concave slot portions 2a formed between an outer diameter portion and an inner diameter portion on both sides. 3 is an insulating end plate.

When the insulating end plate 3 is attached to the end (end portion) of the laminated iron core 2 in the laminating direction, the insulating sheet 1 is sandwiched to complete the insulating treatment of the laminated iron core 2.

This insulating sheet 1 has a portion 1a that insulates the inside of the coil winding portion of the slot 2a of the laminated iron core 2, a portion 1b that covers the side portion of the winding body, and the laminated thickness of the laminated iron core 2 on this portion 1b. The tab 1c is further projected. The difference from the conventional insulating sheet is that the tab 1c is provided in this portion 1b.
It is a point that is equipped with.

The process up to the point that the wound winding body is covered by bending the portion 1b of the insulating sheet 1 is the same as the conventional process. After that, tabs 1 provided on both left and right and upper and lower ends
It differs from the prior art in that c is bent to cover the coil end portion (the coil at the end portion in the stacking direction).

The tabs need only be shaped so as to sufficiently cover the coil end portions in the bent state, and may be provided at both ends of the insulating sheet as in this embodiment, or the tabs can be changed to be provided on one side. May be. Further, since the insulating sheet is coiled in a state where a part of the insulating sheet protrudes from the concave portion, the insulating sheet is obtained by pressing an insulating film having elasticity,
Winding work becomes easy.

After the winding, the insulating sheet is bent and then fixed with tape or the like, and the laminated iron core is joined in an annular shape to obtain a stator.

In this way, a stator in which the linear portion and the coil end portion of the winding body wound around the laminated iron core are insulated by one insulating sheet is obtained, and if this stator is used, another insulator is axially formed. Insulation from the bracket can be secured without interposing. Therefore, a thin electric motor can be obtained.

[0022]

As is apparent from the above embodiments, according to the first and second aspects of the invention, the stator covering the linear portion and the coil end portion of the winding body by bending the insulating sheet in two steps. Is obtained.

According to the inventions of claims 3 and 4,
Since the coil end portion of the stator winding body is insulated, another insulator is not required in the axial direction, and a thin electric motor can be obtained.

[Brief description of drawings]

FIG. 1A is a perspective view of a laminated core after an insulating step according to an embodiment of the present invention. FIG. 1B is a perspective view illustrating an insulating structure of a laminated core according to an embodiment of the present invention.

FIG. 2A is a perspective view of a laminated core after winding in a conventional example, and FIG. 2B is a perspective view illustrating an insulating structure of a laminated core in a conventional example.

[Explanation of symbols]

1 Insulation sheet 1c tab 2 laminated iron core 2a slot part

Claims (4)

[Claims] 1. In a stator for performing concentrated winding for each pole tooth portion of a laminated iron core, a winding step of winding a coil around the pole tooth portion after insulating treatment of the laminated iron core pieces divided and laminated for each pole tooth unit. , Manufacturing of a stator comprising an insulating step of bending the insulating sheet used for the insulating treatment to insulate the linear portion and the coil end portion of the winding body, and an assembly step of annularly joining the laminated core pieces that have undergone the insulating step Method. 2. The method of manufacturing a stator according to claim 1, wherein, in the insulating step, the linear portion of the winding body is covered by the first bending and the coil end portion of the winding body is covered by the second bending. 3. An electric motor provided with a stator having concentrated windings on pole teeth of a laminated core, wherein concave slot portions formed on both sides of the pole teeth of a laminated core piece divided and laminated for each pole tooth unit. An electric motor, comprising: an insulating sheet that covers in the axial direction, wherein the linear portion and the coil end portion of the winding body are insulated by the insulating sheet. 4. The electric motor according to claim 3, wherein the insulating sheet has tabs projecting from the laminated thickness of the laminated iron core at the ends, and the tabs are bent to cover the coil end portions.