Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1985-09-20
1987-03-31
Tanner, Harry
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62154, 62158, 62230, 361 22, 361 29, 361 33, F25B 4900, H02H 700
Patent
active
046532854
ABSTRACT:
Disclosed are refrigeration system control systems and methods for compressor motor protection and defrost control. The disclosed systems and methods are generic in the sense that they are self-calibrating and so 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. The disclosed systems and methods sense loading on the compressor and evaporator fan motors, preferably by sensing the voltage across the capacitor-run winding of an AC induction motor and normalizing with respect to line voltage. The self-calibrating capability is implemented by taking advantage of the changing loads as a function of time on both the compressor and fan motors during both normal and abnormal operation of a refrigeration system. In overview, a reference value of motor loading is established for each motor at certain times during an ON cycle. At later times the then-prevailing motor loading is compared to the stored reference in order to provide a basis for control decisions. The ratio of capacitor-run winding voltage to line voltage is an advantageous indicator of motor loading. In one embodiment, a reference ratio of capacitor-run winding voltage to line voltage is established, and at later times is compared to the then-prevailing ratio of capacitor-run winding voltage to line voltage.
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General Electric Company
Houser H. Neil
Reams Radford M.
Tanner Harry
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