| 摘要 |
PURPOSE:To prevent a burning of a motor even if a temperature detection circuit is omitted by providing a superconductive material on the midway of a wiring which connects power supply to a winding of the motor. CONSTITUTION:A superconductive material 11 is provided on the midway through a wiring 10 which supplies the current to a motor 1 from power supply 9 through a thermostat 7. The thermostat 7 is turned ON, and the motor 1 is driven. When a winding temperature reaches a temperature higher than a certain one by some sort of cause, the superconductive material 11 is turned into an insulation condition, and the circuit current is cut off. According to the constitution, even though a temperature detection circuit is not provided, a contactless burning prevention circuit is formed. In case of a three phase motor, the superconductive material is provided to a two-wire line. |
