| 摘要 |
PURPOSE:To obtain an induction motor of high efficiency, by using a temperature characteristic of a superconductive material, in which starting is performed in a normal conducting state to suppress the starting current, and by lowering the temperature of a conductor in high speed to bring it into superconducting state. CONSTITUTION:A stator winding 2, a rotor end ring 4 and a bar 5 of a squirrel cage induction motor are made of a superconductive material. In starting the motor, it is in the normal conducting region. When the starting is finished and after it comes into a steady state, the stator winding 2, rotor end ring 4 and bar 5 are cooled so that it becomes superconducting state. As a result, as the primary and the secondary resistance will be zero ohm, the primary and secondary copper loss will be zero watt and the efficiency is improved. In starting the motor, since the starting is performed in the normal conducting state, no remarkable difference is found in the conventional induction motor and the starting current. Any one of the conductors among the stator winding 2, the end ring 4 and the bar 5 can be made of the superconductive material.
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