COMPUTER CONTROL OF THYRISTORIZED INDUCTION-MOTORS AND ONLINE PERFORMANCE PREDICTIONS

This paper describes a method of modelling the dynamic behaviour of th yristor controlled induction motors. Real time operational verificatio n of the model is achieved by interfacing the drive system to a comput er. The steady state torque produced by the motor is described as a fu nction of firing angle, extinction angle and speed. The model concentr ates on the open loop transfer functions of induction machines for sma ll perturbations in motor speed and firing angles. The non-linear char acteristics of the open loop transfer function has been discussed. The solutions presented here can lead to a comprehensive closed loop anal ysis for the dynamic behaviour of induction motors in industrial appli cations.