Electricity: electrical systems and devices – Safety and protection of systems and devices – Compressor protective circuits
Patent
1985-09-20
1988-01-26
Leung, Philip H.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Compressor protective circuits
361 29, 361 33, 361 86, 318782, 318445, H02H 708
Patent
active
047220198
ABSTRACT:
Calibrated methods and systems for protecting refrigerant motor/compressors against overload and loss of refrigerant conditions, independent of compressor and system size, while avoiding the need for a plurality of sensors. The disclosed methods and systems are generic in the sense that they may be employed in a variety of different air conditioner or heat pump models of different sizes and capacities, without being specifically tailored for a particular model, although a factory calibration adjustment is required. The disclosed methods and systems sense loading on the compressor motor, and make control decisions based thereon. A permanent compressor motor reference loading is established when the refrigeration system has a known correct refrigerant charge and the motor/compressor has a known load. This is typically accomplished in the factory after a predetermined stabilization interval has elapsed following initial start up of the motor/compressor. During operation thereafter, at least a representation of prevailing compressor motor loading is at least periodically sensed. A low-load condition indicative of a loss of refrigerant or of insufficient evaporator airflow is recognized if the prevailing loading is less than a low load threshold loading established as a first predetermined function of the permanent reference loading. A high load condition indicative of an excessive load on the motor/compressor is recognized if the prevailing loading exceeds a high load threshold loading established as a second predetermined function of the permanent reference loading. In either case, the motor/compressor is deenergized.
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Deboer Todd E.
General Electric Company
Houser H. Neil
Leung Philip H.
Reams Radford M.
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