Motor protection circuit

Details Motor protection circuit Motor protection circuit

1980-01-31

1982-04-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 96, 361 87, H02H 7085

Patent

active

043273912

ABSTRACT:
A protection circuit protects a motor against excessive energizing current and exposure time conditions in accordance with the inverse relationship existing between these quantities. The circuit includes a pulse generator which generates a pulse train signal having a pulse rate proportional to the magnitude of the excess current applied to the motor. The pulses of the pulse train signal are counted up in a counter to a predetermined number. When that number is reached, the circuit operates to disconnect the motor. The greater the excess motor current, the higher the pulse rate of the pulse train signal, and the shorter the counting time required to obtain the predetermined number. The inverse relationship between excess current magnitude and exposure time is thus obtained. The circuit indicates when excess current is being applied to the motor and retains that indication after disconnection.

REFERENCES:
patent: 3419757 (1968-12-01), Steen
patent: 3831061 (1974-08-01), Boyd
patent: 4021700 (1977-05-01), Ellis-Anwyl
Reliance Electric Company, Drawing No. 29651, dated Sep. 27, 1977, titled-"Wiring Diagram"-56 Power Unit.

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