Control apparatus for two-speed compressor

Details Control apparatus for two-speed compressor Control apparatus for two-speed compressor

1974-01-24

1976-01-27

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Field circuit control

318224R, 317 40R, 318334, 318471, H02H 504, H02D 128, H02P 138

Patent

active

039355195

ABSTRACT:
The disclosure describes a refrigerant compressor of the type driven by a motor capable of operating at a low speed and a high speed, the motor including first, second and third stator coils. First, second and third temperature sensors are located adjacent the first, second and third stator coils, respectively, for detecting any change in temperature of the coils. If the temperature of any of the stator coils exceeds a perdetermined value, a control device operates a switch in a pilot circuit that turns off the motor before damage from excessive heat can occur. A unique contactor assembly utilizing both electrical and mechanical interlocks interconnects the stator coils to provide two speed operation.

REFERENCES:
patent: 2280914 (1942-04-01), Johns
patent: 2397183 (1946-03-01), Kilgore et al.
patent: 2521519 (1950-09-01), Hunter et al.
patent: 3175144 (1965-03-01), Rawcliffe
patent: 3366843 (1968-01-01), Evalds
patent: 3404313 (1968-10-01), Happel et al.
patent: 3489881 (1970-01-01), Chambers
patent: 3584980 (1971-06-01), Cawley et al.
patent: 3594625 (1971-07-01), Richardson
patent: 3819996 (1974-06-01), Habisohn

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