JP2001178112A - Superconducting electric motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconducting electric motor for a vehicle, which allows a large gap between a field system and an armature, drastically reducing the load under the spring of a truck, reducing the level of fluctuations of the load given to a rail, reducing the damages to the rail, at the same time, improving the comfortable ride in the vehicles. SOLUTION: The superconducting electric motor for vehicles is provided with a rotor 2 with an armature 3 provided at an axle 1 of a wheel 9, a stator 6, that is arranged corresponding to the armature 3 and has a superconducting coil 7 for a field system which is mounted on the truck, and a spring 5 that is provided in series with a bearing 4 between the stator 6 and the axle 1. By positively allowing for the relative displacement between the field system and the armature 3, a load under the shaft spring is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting motor for a vehicle.

[0002]

2. Description of the Related Art In a conventional motor, it is a condition for ensuring performance that an air gap between a field and an armature is as small as about 1 to 2 mm. For this reason, both were firmly fixed via a bearing so that their relative positions in the radial direction did not shift.

A motor for a vehicle is generally incorporated in a bogie. In many cases, the entire motor is mounted on the bogie independently of the axle, and power is transmitted to wheels via gears. Had gone.

On the other hand, a gearless motor in which a permanent magnet on the field side is directly attached to an axle has recently been developed in view of the improvement in the performance of a motor using a permanent magnet (Japanese Patent Laid-Open No. 5-184014). Reference).

This has the advantage that the structure is simple and the noise associated with the gears is reduced.

[0006]

However, in the case of the conventional gearless motor described above, the armature on the non-rotating side and the field on the rotating side are integrated via a bearing, so that the whole motor is It will be located below the shaft spring.
For this reason, the gearless motor has a problem that the unsprung load increases.

On the other hand, a superconducting coil or a superconducting bulk has a great feature that it is possible to generate a strong magnetic field that cannot be obtained with a normal conducting coil. As a necessary condition of the electric motor, it is necessary that a magnetic field of a necessary field around the armature to which a current flows is guaranteed.

[0008] Further, conventionally, since the configuration is based on the iron core, there is a problem that when the gap between the iron cores becomes large, the magnetic field around the armature is extremely reduced, and the performance cannot be obtained.

The present invention eliminates the above problems, allows a large air gap between the field and the armature, greatly reduces the unsprung load of the bogie, and reduces the magnitude of the load variation applied to the rail. It is an object of the present invention to provide a superconducting motor for a vehicle that can reduce the number of rails, reduce the damage to the rails, and improve the riding comfort of the vehicle.

[0010]

According to the present invention, there is provided a superconducting motor for a vehicle, comprising: a rotor having an armature provided on an axle of a wheel; And a stator having a field superconducting magnet attached to a bogie, and a spring provided in series with a bearing between the stator and the axle. The load under the shaft spring is reduced by positively allowing the relative displacement.

[2] The superconducting motor for a vehicle according to the above [1], wherein the field superconducting magnet comprises a superconducting coil.

[3] The superconducting motor for a vehicle according to the above [1], wherein the field superconducting magnet is made of a superconducting bulk.

[0013]

Embodiments of the present invention will be described below in detail.

FIG. 1 is a sectional view of a vehicular superconductive motor showing a first embodiment of the present invention.

In this figure, 1 is an axle, 2 is an armature 3
, A bearing, 5 a spring, 6 a stator, 7 a field superconducting coil as a field superconducting magnet cooled by liquid nitrogen in a container 8, 9 fixed to the axle 1. The wheels 10 are rails.

As described above, according to the vehicular superconductive motor of the first embodiment, the rotor 2 having the armature 3 provided on the axle 1 of the wheel 9 and the rotor 2 arranged corresponding to the armature 3 , A stator 6 having a field superconducting coil 7 as a field superconducting magnet attached to a trolley (not shown)
And a spring 5 provided in series with the bearing 4 between the stator 6 and the axle 1 to positively allow relative displacement between the stator 6 and the rotating shaft 1, The load under the shaft spring is reduced.

FIG. 2 is a sectional view of a superconducting motor for a vehicle showing a second embodiment of the present invention.

In this figure, 1 is an axle, 2 is an armature 3
, A bearing, 5 a spring, 11 a stator, 12 a field superconducting bulk as a field superconducting magnet cooled by liquid nitrogen in a container 13, 9 fixed to the axle 1. The wheels 10 are rails.

As described above, according to the vehicle superconductive motor of the second embodiment, the rotor 2 having the armature 3 provided on the axle 1 of the wheel 9 and the rotor 2 arranged corresponding to the armature 3 A stator 11 having a field superconducting bulk 12 as a field superconducting magnet attached to a bogie (not shown), and a spring 5 provided in series with the bearing 4 between the stator 11 and the axle 1. By positively permitting the relative displacement between the stator 11 and the rotary shaft 1, the load (weight) under the shaft spring is reduced.

As described above, according to the present invention, a superconducting magnet for a field (superconducting coil or superconducting bulk) provides a strong magnetic field to an armature without relying on an iron core or by using a minimum iron core. Utilizing the fact that it can be secured in the periphery, it is possible to allow a large gap between the magnetic field and the armature, which was not considered in the past.

Thus, even if one of the field and the armature is directly fixed to the axle and the other is fixed to the bogie on the shaft spring, the performance as the electric motor can be sufficiently ensured. The lower load can be greatly reduced.

Since the unsprung load of the truck can be reduced in this manner, the magnitude of the load variation applied to the rail can be reduced, and the damage to the rail can be reduced and the riding comfort of the vehicle can be improved. Has characteristics.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0024]

As described above, according to the present invention, the following effects can be obtained.

The field superconducting magnet (superconducting coil or superconducting bulk) utilizes the fact that a strong magnetic field can be secured around the armature without relying on the iron core or by using a minimum iron core. Can be allowed between the field and the armature.

Thus, even if one of the field and the armature is directly fixed to the axle and the other is fixed to the bogie on the shaft spring, it is possible to sufficiently secure the performance as an electric motor. The lower load can be greatly reduced.

Therefore, the unsprung load of the bogie can be reduced, so that the magnitude of the load fluctuation applied to the rail can be reduced, the damage to the rail can be reduced, and the riding comfort of the vehicle can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a superconducting motor for a vehicle showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a superconducting motor for a vehicle showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle 2 Rotor 3 Armature 4 Bearing 5 Spring 6,11 Stator 7 Superconducting coil for field (superconducting magnet for field) 8,13 Container 9 Axle 10 Rail 12 Superconducting bulk for field

Claims (3)

[Claims] 1. A rotor having an armature provided on an axle of a wheel, and (b) a stator having a field superconducting magnet arranged corresponding to the armature and mounted on a bogie. And (c) a spring provided in series with the bearing between the stator and the axle, and (d) positively permitting a relative displacement between the field and the armature, thereby providing a shaft spring. A superconducting motor for a vehicle, wherein a lower load is reduced. 2. A superconducting motor for a vehicle according to claim 1, wherein said superconducting magnet for a field comprises a superconducting coil. 3. The superconducting motor for a vehicle according to claim 1, wherein said superconducting magnet for a field comprises a superconducting bulk.