Electricity: electrical systems and devices – Safety and protection of systems and devices – Compressor protective circuits
Patent
1997-06-03
1998-07-21
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Compressor protective circuits
361 23, 361 24, 361 25, 361 27, 361 30, 361103, 361106, H02H 700, H02H 504
Patent
active
057842329
ABSTRACT:
The present invention involves control and protection circuit for a compressor motor which includes an inductively activated contactor for controlling the flow of current to the compressor motor. The circuitry of the present invention includes a plurality of current detectors associated with each phase winding of the compressor motor for sensing the current in each phase winding. The sensed currents are combined in a predetermined manner and used to provide protection against an overcurrent condition, single phase operation and light loading condition. Additional detector circuits are also connected to the present control and protection circuit to provide protection against high temperature in the compressor motor windings, high temperature in various component of the compressor motor, and undervoltage in the power supply. A temperature detector disposed inside the cooling chamber also provides for cycling of the compressor motor to maintain the temperature in the cooling chamber at within a predetermined temperature range. The inductive coupling is activated by a protection timer and an oscillator. The protection timer deactivates the oscillator when a trip signal is received from the detector circuits. A predetermined time delay is provided by the protection timer to prevent spurious trips of the compressor motor.
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Gaffin Jeffrey A.
Huynh Kim N.
Tecumseh Products Company
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