JP2000333399A - Motor stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure breakdown voltage between adjacent windings with reliability by winding coils on the pole tooth portions on a laminated core in a concentrated manner, placing an insulating sheet between adjacent windings, and performing resin molding. SOLUTION: The winding portions of a laminated core 1 are constituted of an insulator 3 and end insulators 21 placed at both the ends of the laminated core 1, and wires 4 as coils are wound on pole tooth portions 2 in a concentrated manner to form a pole tooth unit body. A specified number of pole tooth unit bodies are annularly coupled with one another, and three-phase connection is performed at a wiring board 22 and pins 33 for wiring. Thereafter, the workpiece is set in resin molding dies, and a rectangle insulating sheet 5 is inserted into the gaps between the adjacent windings. Then resin molding is performed to cover the winding portions on the laminated core 1 and the wiring board 22. Thus, the breakdown voltage between the adjacent windings is ensured with reliability.

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 used for various industrial equipment, and more particularly to a phase insulation and a ground insulation of a resin molded stator.

[0002]

2. Description of the Related Art In recent years, in order to reduce the size and performance of motors, the necessity of increasing the density of windings and reducing the space required for coil ends has been increasing.

On the other hand, from the viewpoint of safety, it is necessary to secure and improve insulation performance. In particular, the tendency is remarkable in an AC servomotor used as a drive source of a robot or an NC machine tool.

Hereinafter, the structure of a conventional motor stator will be described with reference to the drawings.

3 and 4, 31 is an end insulator, 32 is a wiring board, 33 is a wiring pin, 41 is a laminated core, 42 is a pole tooth, 43 is an insulator, 44 is a winding, and 45 is a resin part. is there.

First, the wound portion of the laminated core 41 is constituted by the insulator 43 and the end insulators 31 disposed at both ends of the laminated core 41. A winding 44 is formed by being concentratedly wound around the pole teeth 42 to form a pole tooth unit body. A predetermined number of the pole tooth units are connected in a ring shape, and three-phase connection is performed on the wiring board 32, followed by resin molding to form a stator. Adjacent windings are insulated by the molded resin.

[0007]

However, in the above-mentioned conventional motor stator, the distance between adjacent windings becomes shorter as the density of windings and the space saving at the ends of the windings progress. The outer winding wound around the laminated iron core moves due to the pressure during resin molding, causing a short-circuit due to contact in the same slot or a short-circuit due to contact between adjacent slots. occured.

The present invention has been made to solve the above-mentioned problems, and by ensuring the withstand voltage between adjacent windings,
It is an object of the present invention to provide a resin molded stator that can be made smaller in size with higher density.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a laminated iron core and a coil wound around the pole teeth of the laminated iron core, and an insulating sheet is provided between adjacent windings. It is configured to be interposed and resin molded.

Thus, contact between adjacent windings can be prevented, and dielectric strength can be ensured.

[0011]

DETAILED DESCRIPTION OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a laminated core and windings concentratedly wound around the pole teeth of the laminated core, and an insulating sheet is interposed between the adjacent windings. The contact between the adjacent windings is completely cut off by the insulating sheet and the resin portion, and the insulation distance can be reliably secured and the required withstand voltage can be obtained.

Further, an insulator interposed between the pole teeth portion and the windings has a shape also serving as an insulating sheet, and the insulating sheet portion is bent so as to also serve as an insulating sheet, so that the space between adjacent windings is formed. The contact between adjacent windings is completely cut off with a small number of parts, and a required insulation withstand voltage can be obtained by securing an insulation distance.

Furthermore, a wiring board for connecting both ends of the winding of each pole tooth unit is provided, and the wiring board is also integrally molded with resin to secure an insulation distance between adjacent windings. In addition, the insulation distance between the winding and the wiring board can be ensured, the interphase insulation and the ground insulation can be ensured, and the space at the coil end can be saved.

[0014]

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

FIG. 1 is a radial sectional view of a stator of an electric motor showing an embodiment of the present invention. Similarly, FIG.
FIG. 2 is an axial sectional view of a stator of the electric motor of FIG. 1.

1 and 2, 1 is a laminated iron core, 2 is a pole tooth portion, 3 is an insulator, 4 is a winding, 5 is a strip-shaped insulating sheet, and 6 is a resin portion. In FIG. 2, 21 is an end insulator, 22 is a wiring board, and 23 is a wiring pin.

First, the winding portion of the laminated core 1 is constituted by the insulator 3 and end insulators 21 disposed at both ends of the laminated core 1. The winding 4 is formed by concentrated winding on the pole teeth portion 2 to form a pole tooth unit body. The pole tooth unit is connected in a predetermined number of rings, and the wiring board 22 and the wiring pins 2 are connected.
After the three-phase connection is performed in 3, a strip-shaped insulating sheet 5 is set in a gap between adjacent windings after being set in a resin molding die, and the winding portion of the laminated core 1 and the wiring board 22 are removed. Perform resin molding to cover.

By interposing the insulating sheet 5 between the adjacent windings as described above, even if the outer winding wound around the laminated core 1 is loosened due to the injection pressure of the molten resin,
The contact between the windings can be reliably cut off, the insulation distance can be ensured, and the required withstand voltage can be obtained.

Further, by integrally molding the wiring board 22 with resin, the insulation distance between the winding and the pattern of the wiring board can be further reduced, and the distance between the patterns on the wiring board can be further reduced. As a result, it is possible to save the space of the coil end portion while securing the required withstand voltage.

Further, in this embodiment, the insulator 3
Although the insulating sheet 5 and the insulating sheet 5 are provided separately, the same effect can be obtained by folding an integrated sheet having the shape of the insulating sheet portion into an insulator and folding it after winding.

Of course, as a result of the above, it goes without saying that the density of the winding can be easily increased.

[0022]

As is clear from the above embodiment, according to the first aspect of the present invention, the dielectric strength between adjacent windings is ensured by combining and using the insulating sheet and the resin molded portion. It is possible to increase the density of the windings and reduce the size and performance of the motor while maintaining safety.

According to the second aspect of the present invention, the above effect can be obtained with a small number of parts by bending the insulator having the shape of the insulating sheet portion interposed between the pole teeth and the winding. Obtainable.

According to the third aspect of the present invention, by integrally molding the wiring board with a resin, the distance between the winding and the wiring board and the distance between the patterns on the wiring board can be reduced. While reducing the size of the coil end portion.

Further, by the resin molding, the safety is ensured, the rigidity of the stator is improved by the resin molding, and the heat radiation is improved by the improvement of the thermal conductivity, so that the continuous output value of the motor can be increased. .

[Brief description of the drawings]

FIG. 1 is a radial sectional view of a stator of an electric motor according to an embodiment of the present invention.

FIG. 2 is an axial sectional view of a motor stator according to an embodiment of the present invention.

FIG. 3 is an axial sectional view of a conventional motor stator.

FIG. 4 is a radial cross-sectional view of a conventional motor.

[Explanation of symbols]

 1, 41 laminated iron core 2, 42 pole teeth 3, 43 insulator 4, 44 winding 5 insulating sheet 6, 45 resin part 22, 32 wiring board 23, 33 wiring pins

Claims (3)

[Claims] 1. A stator for an electric motor, comprising: a laminated core; and windings concentratedly wound around pole teeth of the laminated core, and resin-molded with an insulating sheet interposed between the adjacent windings. 2. An insulator interposed between a pole tooth portion and a winding has a shape also serving as an insulating sheet, and the insulating sheet portion is bent to interrupt contact between adjacent windings.
Motor stator as described. 3. The motor stator according to claim 1, further comprising a wiring board for connecting both ends of the winding of each pole tooth unit, wherein the wiring board is also integrally molded with resin.