Overload sensing circuit for a motor

Details Overload sensing circuit for a motor Overload sensing circuit for a motor

1981-08-07

1984-05-29

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340658, 361 85, G08B 2100

Patent

active

044518234

ABSTRACT:
An overload-sensing circuit for an electric motor driven by an alternating signal comprises a supply line connecting the motor to a power source, a resistance in the supply line, and a first comparator for measuring the phase relationship between the power source voltage signal and the motor current signal. A variable resistor is employed to select a phase relationship which represents a load limit for the motor. A second comparator compares the measured phase relationship to the selected phase relationship and produces a signal representing an overload condition of the motor when the measured phase relationship generally equals the selected phase relationship.

REFERENCES:
patent: 3519910 (1970-07-01), Pfaff et al.
patent: 3600657 (1971-08-01), Pfaff et al.
patent: 4194145 (1980-03-01), Ritter
patent: 4194178 (1980-03-01), Dumbeck

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