Method and apparatus for the determination of the shaft position of the compressor of an air conditioning system and control device for stopping of the compressor with the use of the shafts position determination in front of the direction of.

摘要

The load torque of a compressor for circulating refrigerant within a refrigerating cycle changes with the rotational position of the shaft of the compressor, and the phase difference between the primary current and voltage of an induction motor for driving the compressor changes with the load torque. Taking the above facts into consideration, in turning off the compressor driven by the induction motor which is powered with a fixed frequency AC power source, the shaft position of the compressor is detected in accordance with the phase difference, and the current of the motor is turned off at the timing of a particular phase difference when the load torque becomes minimum, thus reducing vibration when the compressor is stopped.