Apparatus and method for braking an electric motor

Details Apparatus and method for braking an electric motor Apparatus and method for braking an electric motor

H - Electricity

02

P

318/85

H02P 3/18 (2006.01)

Patent

CA 1294669

ABSTRACT An electric motor is coupled to the power lines by thyristors. The motor is braked by triggering the thyris- tors at the proper times to produce a electro-magnetic field within the motor which opposes the residual magnetic field of the rotor. The proper time to trigger the thyristors is determined by comparing the polarity of the voltage across the power lines to the back emf voltage from the motor. The thyristors are triggered when these two voltages have oppo- site polarities. The braking circuit also regulates the duty cycle of the thyristors to control the magnitude of the current applied to brake the motor.

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