A Digital Model for a Three-Phase Induction Motor Drive Using a Personal Computer (PC) Software Package

Abstract A discrete stale variable method is used to develop a digital model for a three-phase induction motor drive. It is shown that the computation required in solving the fifth-order non-linear differential equation of the motor is greatly simplified by the exclusive use of matrices. The model can be adapted to the study of steady state as well as dynamic performance of the machine when fed from an inverter. Pulse-width-modulated (PWM) waves are used to test the model which is based on d-q transformations of the motor equations. The validity of the model is confirmed by experimental results obtained from a transputer-based PWM inverter drive system.