Compressor motor protection

Details Compressor motor protection Compressor motor protection

1975-08-25

1976-11-30

Moose, Harry

317 60R, 317135R, H02H 708

Patent

active

039951995

ABSTRACT:
An improved circuit for protecting the motor of a refrigerant compressor includes first and second magnetic contactors which are connected between a source of three-phase AC voltage and the compressor motor. The contactors are normally operated simultaneously so that each of the contactors is periodically opened and closed in accordance with the demands for operation of the compressor motor. If one of the contactors fails in the closed position, the other contactor will open to protect the compressor motor. This result is accomplished through use of a high impedance relay coil provided in parallel with contactor switches in the common line to the compressor motor and a normally closed switch actuated thereby in the control circuit, whereby if one of the contactors should stick closed, the high impedance relay coil can be energized to open the normally closed switch and prevent compressor motor operation and possible damage to the compressor motor.

REFERENCES:
patent: 2697195 (1954-12-01), Courtney
patent: 3656023 (1972-04-01), Hadfield
patent: 3699300 (1972-10-01), Buerki
patent: 3898527 (1975-08-01), Cawley

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