Patent ID: 7637117

Claim:
An air-conditioning system comprising: a refrigeration cycle including an electric compressor, in which a compression mechanism for drawing a refrigerant therein for compression, is integrated with an electric motor for driving the compression mechanism, and a motor drive circuit for driving the electric motor is cooled using an intake refrigerant drawn into the compression mechanism; and a control unit for providing operational control to the motor drive circuit and the refrigeration cycle, wherein when the compression mechanism is at a standstill and a temperature of the motor drive circuit has exceeded a predetermined temperature, the control unit allows the motor drive circuit to drive the electric motor, and the control unit varies a condition of supplying air to exchange heat with the refrigerant flowing through the refrigeration cycle to thereby reduce the temperature of the intake refrigerant and simultaneously operates the electric motor via the motor drive circuit to reduce the temperature of the motor drive circuit even in a state where the compression mechanism is not requested to operate.