Motor protection circuit

Details Motor protection circuit Motor protection circuit

H - Electricity

02

H

318/86

H02H 7/085 (2006.01) H02H 3/04 (2006.01) H02H 3/093 (2006.01) H02H 6/00 (2006.01)

Patent

CA 1157513

- 0 - MOTOR PROTECTION CIRCUIT Abstract of the Disclosure A protection circuit protects a motor against excessive energizing current and exposure time conditions in accordance with the inverse re- lationship 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 re- lationship 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.

362396

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