Prevention of unpowered reverse rotation in compressors

Details Prevention of unpowered reverse rotation in compressors Prevention of unpowered reverse rotation in compressors

2007-11-27

2007-11-27

Nguyen, Hoang (Department: 3748)

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

C417S053000, C418S055100, C418S055600

Reexamination Certificate

active

11017304

ABSTRACT:
The shutdown of a compressor (10) installed in a refrigerant circuit (2) in air conditioning or refrigeration system is controlled so as to prevent unpowered reverse rotation of the compressor. Prior to terminating electric power to the compressor drive motor (24), the pressure within the system is relieved and substantially equalized across the compressor, thereby eliminating the possibility of unpowered reverse rotation of the compressor at shutdown. Pressure relief and equalization may be achieved by reducing the operating speed of the compressor to a low forward speed for a period of time prior to deenergizing the compressor drive motor. Pressure equalization may also be achieved by driving the compressor in reverse rotation prior to deenergizing the drive motor.

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