To solve a problem of the dependance of regenerative energy force on the rotational speed of a motor.
The field current of a superconducting coil 17 is increased or decreased according to a breaking force requested by an operating portion associated with brake operation, and the magnitude of magnetic field of the field portion of a superconducting motor 3 is thereby controlled. Conventional regenerative brakes of permanent magnets can obtain only a certain braking force. With the above-mentioned constitution, so large a magnetic field that these permanent magnets cannot produce can be produced, and a magnetic field arising from the field of the superconducting coil 17 can be narrowed and minimized. Thus, its braking force can be appropriately adjusted, and this is convenient. In this case, the superconducting coil 17 is sufficiently cooled to keep it in superconducting state. As a result, a field current can be increased, and the driving torque of the superconducting motor 3 and the braking load power of it as a generator are increased.
COPYRIGHT: (C)2005,JPO&NCIPI
Kenichi Sato
Toru Okazaki
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| JP6006907A |
Takahiro Arita