Patent ID: 6889516

Claim:
A cooling system for a motor comprising a driving motor, a power converter for controlling said driving motor, and cooling means for forced cooling said driving motor and said power converter, wherein: said cooling means has refrigerant feeding means, motor temperature detection means for detecting the temperature of said driving motor and outputting a motor temperature detection signal, power converter temperature detection means for detecting the temperature of said power converter and outputting it as a power converter temperature detection signal, and forcible cooling control means for referring to said motor temperature detection signal and said power converter temperature detection signal and controlling said refrigerant feeding means and said forcible cooling control means has motor forcible cooling control temperature storage means for storing said motor forcible cooling control temperature for starting or stopping forcible cooling for said driving motor, power converter operation start temperature storage means for storing the temperature of said power converter at the time of operation start as a power converter operation start temperature, and power converter forcible cooling control temperature rise amount storage means for setting and storing said temperatures for starting and stopping forcible cooling for said power converter as a forcible cooling control temperature rise amount by the temperature rise amount from said power converter operation start temperature and refers to said power temperature detection signal and said power converter temperature detection signal and when said motor temperature detection signal rises up to said motor forcible cooling control temperature or the temperature rise amount of said power converter temperature detection signal from said power converter operation start temperature reaches the rise amount of said forcible cooling control temperature, starts control of the operation of said refrigerant feeding means.