| 摘要 |
PROBLEM TO BE SOLVED: To prevent the step out of a synchronization-type electric motor for driving a compressor, when a super-critical refrigeration cycle is activated. SOLUTION: Until the number of rotations of a compressor (an electric motor) reaches a prescribed number of rotations where the electric motor can be stably rotated, the opening of a pressure control valve is adjusted, so that refrigerant pressure at the outlet side of a radiator (a high-pressure side) reaches a control pressure Pc or less, and at the same time, the number of rotations of the compressor is increased, thus reducing the fluctuation of torque operating on the electric motor when the a super-critical refrigerating cycle is activated, preventing step out of the electric motor, when the super-critical refrigerating (a compressor 100) is activated, and preventing the stall of the electric motor. |
