Control apparatus for variable-speed reversible motor

Details Control apparatus for variable-speed reversible motor Control apparatus for variable-speed reversible motor

1981-12-03

1982-11-02

Weldon, Ulysses

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318471, 318472, 318334, G05B 500

Patent

active

043575650

ABSTRACT:
Disclosed is an apparatus for controlling a motor unit including a variable-speed reversible main motor for driving a load and a subsidiary motor for driving a fan. The control apparatus comprises a temperature sensor circuit sensing the temperature of the main motor and generating a first output signal when the temperature of the main motor exceeds a first predetermined level, a second output signal when the main motor temperature exceeds a second predetermined level higher than the first predetermined level and a third output signal when the main motor temperature drops to a level lower than the first predetermined level, and a control circuit connected to the temperature sensor circuit for energizing the subsidiary motor in response to the first output signal, deenergizing the main motor in response to the second output signal and deenergizing the subsidiary motor in response to the third output signal.

REFERENCES:
patent: 2469820 (1949-05-01), Fuge
patent: 2518597 (1950-08-01), Brooks
patent: 3079524 (1963-02-01), Gibson et al.
patent: 3794896 (1974-02-01), Holt
Walter C. Painter, "Blower Control Circuit", RCA Technical Notes, No. 646, Nov. 1965.

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