Protection circuit for d.c. motors

Details Protection circuit for d.c. motors Protection circuit for d.c. motors

1981-10-30

1984-02-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 75, 361101, H02H 7085

Patent

active

044306822

ABSTRACT:
A d.c. motor, particularly a paper-feed drive motor for printers, is monitored and controlled (e.g., for protection against paper jamming) by controlling a motor switch to turn the motor off temporarily when excess current is monitored, but turning it on to probe persistence of the condition. This turn-on will remain short if, indeed, overload current conditions are still present. The circuit includes a bistable multivibrator with input circuit rendering it monostable for normal operating conditions and astable for the overload case.

REFERENCES:
patent: 4019096 (1977-04-01), Bullinga
patent: 4363068 (1982-12-01), Burns

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