Compressor cutoff control responsive to shaft position

Details Compressor cutoff control responsive to shaft position Compressor cutoff control responsive to shaft position

1989-07-14

1991-05-14

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

318799, F04B 4902

Patent

active

050151533

ABSTRACT:
The load torque of a compressor for circulating refrigerant in 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 by 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.

REFERENCES:
patent: 3600657 (1971-08-01), Pfaff et al.
patent: 4481786 (1984-11-01), Bashark

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