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ABSTRACT
In this paper the torque and speed of an induction motor are controlled using a chopper circuit on the rotor side. An experimental control system is built and tested. Detailed design of the chopper control circuit and the circuits associated with the control system are reported.
It is shown that the torque can be kept constant over a wide range of speed. A simplified model is used; to analyze the torque slip characteristics and the harmonic content in the a.c. component of the rectified current. Dynamic braking for the motor, using the rectified rotor current, is proposed and was shown to achieve rapid braking.
A closed loop control of the motor speed is also performed. Calculations have been carried out in order to predict suitable system parameters for acceptable response. The control system stabilizes the speed against load torque variations using a proportional-pluse-integral controller. Computed response is compared with results obtained experimentally.