Control apparatus for two-speed compressor

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

1975-09-05

1977-08-09

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318224R, 318471, H02H 708

Patent

active

040415422

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 predetermined 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: 2782353 (1957-02-01), Seely
patent: 3070734 (1962-12-01), Rawcliffe
patent: 3249816 (1966-05-01), Courtin et al.
patent: 3329869 (1967-07-01), Obenhaus
patent: 3404313 (1968-10-01), Happel et al.
patent: 3416060 (1968-12-01), Evalds
patent: 3555356 (1971-01-01), Kaiser
patent: 3585451 (1971-06-01), Day
patent: 3761794 (1973-09-01), Quinlisk, Jr. et al
patent: 3819996 (1974-06-01), Habisohn
patent: 3935519 (1976-01-01), Pfarrer et al.

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