D.c. motor speed controller

Details D.c. motor speed controller D.c. motor speed controller

G - Physics

05

D

318/86, 342/34.4

G05D 13/00 (2006.01) H02P 7/29 (2006.01)

Patent

CA 1113592

ABSTRACT OF THE DISCLOSURE A direct current, variable duty cycle control circuit for the manual control of the supply of power from a direct current source to a motor is disclosed including a transistor arrangement operable when enabled to couple the direct current source to the motor along with means for enabling that transistor arrangement during an operator determinable portion of each of a series of time intervals and a sensing circuit receptive to an overload condition of the transistor arrangement for disabling that trans- istor arrangement. The disclosed system includes an operator control member effective in a first position to prevent the ener- gization of the motor by preventing the supply of electrical power to the control circuit, effective in a second series of position to vary the portion of each time interval during which the motor is supplied power and effective in a third position to deliver power continuously to the motor by bypassing the transistor arrangement.

314437

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