JPS61173641A - Induction motor for driving vehicle - Google Patents

Abstract

PURPOSE:To enable to increase the diameter of a motor without varying a distance between the center of the motor and the center of an axle by providing the prescribed number of notches on the outer periphery of a stationary core, thereby eliminating the unbalance of a magnetic circuit of the core. CONSTITUTION:The number of poles, i.e., 4 notches 12 are formed at an equal interval in the circumferential direction on the outer periphery 11 of a stationary core 10. One of the notches 12 is disposed to correspond to the notch of a motor frame 1. In case of driving, since the notches 12 of the number corresponding to the number of poles of a motor are formed at an equal interval on the outer peripheral surface of the core 10 of a magnetic circuit, the unbalance of the magnetic circuit is canceled to eliminate the variation in the magnetic resistance, to stabilize the magnetic flux and to eliminate an excess axial voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an induction motor for driving a vehicle installed, for example, in a bogie of a train.

[Technical background of the invention and its problems]

Traditionally, DC motors have been used as vehicle drive motors installed on train bogies for ease of control, but recent advances in power electronics technology have made it possible to control the DC motor panels of induction motors. Electric motors began to be used to drive vehicles.

This type of induction motor, for example, a hook-type induction motor, has a bearing portion 2 on the outer surface of a motor frame 1, as shown in FIG.
At the same time, a nose 3 is provided protrudingly on the outer surface of the motor frame 1 facing the bearing part 2 in the diametrical direction.
is attached to the shaft 5 of the wheel 4, and the nose 3 is attached to a recess 7 provided in the truck 6, so that the nose 3 is fixedly arranged on the truck 6.

On the other hand, a hook-type induction motor is constructed by disposing a stator core 8 and a squirrel-cage rotor 9 within a motor frame 1, and when trying to obtain high output, the outer diameter of the motor frame 1 is A. becomes large.

Therefore, notches 1a and 8a are provided in the motor frame 1 and the stator core 8 so that the distance B between the center of the motor and the center of the shaft 5 can be set small.

However, in the above-mentioned type of induction motor for driving a vehicle, the iron core, which is the magnetic circuit, is cut out, which causes imbalance in the magnetic circuit, causing fluctuations in magnetic flux due to changes in magnetic resistance, and generating shaft voltage. Since such shaft voltage causes damage to the sliding surface of the bearing, there is a problem in that it is necessary to separately install various prevention devices.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an induction motor for driving a vehicle in which the diameter of the motor can be set large without changing the distance between the center of the motor and the center of an axle.

[Summary of the invention]

The present invention provides cutouts of the number of poles of the motor or an integral multiple of the number of poles at equal intervals in the circumferential direction on the outer periphery of the stator core,
This is an induction motor for driving a vehicle that eliminates unbalance in the magnetic circuit of the stator core.

[Embodiments of the invention]

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

In FIG. 1, the same members as in FIG. 3 are given the same reference numerals.

FIG. 1 shows an embodiment in which the present invention is applied to a Cardan type 4° pole induction motor, in which the outer circumference 11 of the stator core 10 has four notches 12.
... are provided at equal intervals in the circumferential direction. One of the notches 12 is arranged to correspond to the notch 1a of the motor frame 1.

Note that the cutout portion 1a of the motor frame 1 is not provided in any portion other than the axle portion because there is no need to escape from the interference of the axle.

However, during operation, the stator core 10, which is a magnetic circuit,
Since the number of notches 12 corresponding to the number of motor poles are provided at equal intervals on the outer peripheral surface of the motor, the unbalance of the magnetic circuit is canceled out, no change in magnetic resistance occurs, and the magnetic flux is stabilized.
Excessive shaft voltage does not occur.

FIG. 2 shows another embodiment of the present invention, in which the induction motor is supported and fixed to a trolley 6. In this case, the induction motor is located above the spring arrangement of the vehicle and the axle 5 is located below the spring arrangement, so that they move relative to each other in the vertical direction, so that the motor frame 20 and the axle 5
It is necessary to set a gap C between the two.

Notch 21″ provided in the motor frame 20
Since is a straight plane in the vertical direction, the cutout portion 23 formed in the stator core 22 also has a planar shape.

The number of cutouts 24 corresponds to the number of magnetic poles, but it goes without saying that the same effect can be obtained even if the number of cutouts 24 is an integral multiple of the number of poles.

〔Effect of the invention〕

As described above, according to the present invention, the diameter of the traction motor can be set larger without changing the center-to-center distance between the axle and the traction motor, and therefore vehicle performance can be improved by increasing capacity. .

[Brief explanation of drawings]

FIG. 1 is a sectional view of an induction motor for driving a vehicle according to the present invention;
FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a sectional view of a conventional induction motor for driving a vehicle. 1... Motor frame, 1a... Notch, 10
... Stator core, 12... Notch part. Applicant's agent Kiyoshi Inomata Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] At the part corresponding to the axle mounting part on the outer periphery of the stator core,
An induction motor for driving a vehicle, characterized in that notched portions are formed, and notched portions equal to the number of magnetic poles or an integral multiple of the number of magnetic poles are provided at equal intervals in the circumferential direction on the outer periphery of the stator core.