ROTATIONAL SPEED CONTROL DEVICE, ROTARY COMPRESSOR SYSTEM, CONTROL SYSTEM, AND ROTATIONAL SPEED CONTROL METHOD

摘要

A control device configured to prevent the leakage of a refrigerant gas in a low-pressure chamber from a high-pressure chamber in a rotary compressor is provided. A rotational speed control device acquires an angle of rotation of a motor used to rotatably drive a crankshaft for driving a piston rotor in the rotary compressor, compares a threshold value set in advance to correspond to an amount of leakage of the refrigerant gas from the high-pressure chamber to the low-pressure chamber in a cylinder with an angle of rotation of a crankshaft based on the acquired angle of rotation of the motor, determines whether to change a rotational speed of the motor, and changes a rotational speed command value to the motor when it is determined that the rotational speed is changed.