Electricity: motive power systems – Induction motor systems – Braking
Patent
1987-10-02
1989-05-23
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Braking
318729, 318757, H02P 318
Patent
active
048333867
ABSTRACT:
An electric motor is coupled to the power lines by thyristors. The motor is braked by triggering the thyristors 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 opposite 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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Smart Motor Controller (SMC)(Bulletin 150).
Allen-Bradley Company Inc.
Smith Jr. David
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