| 摘要 |
PROBLEM TO BE SOLVED: To provide an overload protective device of a motor drive system for carrying out protection by fully detecting an increase in winding temperature of a motor caused by the generation of an overload state. SOLUTION: The temperature of a current-detecting resistor 44 at the feeding path of a drive power supply to a motor 3 for rotating an air-blowing fan 2 is detected by a thermistor 45. When the temperature of the current-detecting resistor 44 reaches a prescribed temperature of 150 deg.C, the level of a drive control signal generated from an ECU of an air conditioner to a drive control unit 34 is made to decrease by 10% by the temperature-detecting circuit 43A. |
