JPH0622478A - Stator core for motor - Google Patents

Abstract

PURPOSE:To reduce vibration, noise of a motor which has a stator core formed of an inner periphery and an outer periphery in which bore sides are coupled. CONSTITUTION:A conductive short-circuiting coil 5 to short-circuit a stator bore side coupling part 3 is mounted at the part 3 to cancel a leakage magnetic flux generated at the part 3, thereby reducing vibration, noise of a motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of an electric motor having an inner peripheral portion and an outer peripheral portion whose inner diameter sides are connected.

[0002]

2. Description of the Related Art Conventionally, the stator core of this type of electric motor is
The stator has a structure including an inner peripheral portion in which the required number of inner diameter sides are connected in the circumferential direction and a cylindrical outer peripheral portion.

[0003]

In such a conventional stator core of an electric motor, a required number of iron cores in which the inner diameter side of the laminated core of the inner peripheral portion is connected in the circumferential direction are used. There is a problem that leakage magnetic flux is generated due to magnetic flux saturation, which causes vibration and noise increase of the electric motor.

The present invention is intended to solve the above problems, and has as its object to reduce vibration and noise of an electric motor.

[0005]

In order to achieve the above object, a stator iron core of an electric motor of the present invention is provided with a required number of conductive short-circuit coils that short-circuit the inner diameter side connecting portion of the inner peripheral portion. It is a structured structure.

[0006]

According to the present invention, in the above-mentioned structure, by installing the short-circuit coil in the inner diameter side connecting portion, the magnetic flux caused by the current flowing through the rotor is induced in the short-circuit coil, and the magnetic flux generated in the short-circuit coil is generated in the connecting portion. It acts to cancel the leakage magnetic flux including harmonic components. This action causes the vibration of the motor,
It will reduce noise.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a stator laminated iron core of an electric motor has a cylindrical outer peripheral portion 1 and tooth portions 2 around which a winding is wound.
This tooth portion 2 and an inner peripheral portion 4 which is integrally formed with a connecting portion 3 in which a required number of inner diameter sides are connected in the circumferential direction are integrated, and a short-circuit coil is formed so that the connecting portion 3 is wound around the inner diameter side connecting portion 3. 5 is installed.

In the above structure, as shown in FIG. 2, by installing the short-circuit coil 5 in the inner diameter side connecting portion 3, a magnetic flux 7 is generated by the current flowing through the rotor slot 6, and the harmonic component of the connecting portion 3 is generated. It will cancel out the leakage magnetic flux including.

The shape of the short-circuit coil 5 is a conductor having an arbitrary size, and when the effect can be obtained, the connecting portion 3 is used.
It does not have to be installed separately.

[0011]

As is apparent from the above description of the embodiments, according to the present invention, the action of canceling the leakage magnetic flux generated in the connecting portion by installing the short-circuit coil in the connecting portion on the inner diameter side of the stator. However, vibration and noise of the electric motor can be reduced.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a stator core of an electric motor according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the flow of magnetic flux in the connecting portion.

[Explanation of symbols]

 1 outer peripheral part 2 tooth part 3 connecting part 4 inner peripheral part 5 short-circuit coil

Claims (1)

[Claims] 1. A cylindrical outer peripheral portion, a tooth portion around which a winding is wound, and an inner peripheral portion integrally formed with a connecting portion that connects the tooth portion and the inner diameter side by a required number in the circumferential direction. A stator core for an electric motor, comprising a laminated core, and a required number of electrically conductive short-circuit coils being installed in the connecting portion.