Over-speed preventing apparatus for dc motor

Details Over-speed preventing apparatus for dc motor Over-speed preventing apparatus for dc motor

H - Electricity

02

P

318/106

H02P 7/06 (2006.01) B66B 1/30 (2006.01) B66B 5/06 (2006.01) H02P 7/34 (2006.01)

Patent

CA 1042978

OVER-SPEED PREVENTING APPARATUS FOR DC MOTOR ABSTRACT OF THE DISCLOSURE An over-speed preventing apparatus for a DC motor comprises a DC motor the speed of which is controlled by the adjustment of the armature voltage thereof. A rectifier circuit supplies power to the separately-excited field winding of the motor. A predetermined field current command is generated and the actual field current is detected. A constant current control system controls the rectifier circuit in accordance with the error between the field current command and the detected value of the field current. The apparatus further comprises a unidirectional element connected in parallel to the field winding in the direction in which the field current is made to flow back. A current decrease detector is inserted between the rectifier circuit and the parallel circuit including the field winding and the unidirectional element. A protecting device is energized by the current decrease detector.

231341

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