Overcurrent protection apparatus for DC motor

Details Overcurrent protection apparatus for DC motor Overcurrent protection apparatus for DC motor

1981-12-29

1984-09-25

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 94, 361 87, H02H 708

Patent

active

044738560

ABSTRACT:
An overcurrent protection apparatus for a DC motor which can be used with a speed control system of a DC motor to prevent an overcurrent condition arising when the DC motor is run with a heavy load or locked by an overload from burning or overheating windings of the motor. The apparatus is constructed using at least one integrated circuit and includes a current mirror circuit for detecting an overcurrent and for cutting off the supply current of the DC motor. A timing circuit prevents overcurrents lasting only a short time from triggering the apparatus to shut down the motor. Once the apparatus is triggered to shut off the motor, the motor will remain off for an indefinite period of time until the apparatus is reset.

REFERENCES:
patent: 3558978 (1971-01-01), Nye, Jr. et al.
patent: 3564337 (1971-02-01), MacGeorge
patent: 3845405 (1974-10-01), Leidich
patent: 4052625 (1977-10-01), Cameron

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