CS1 drive induction motor by vector approximation

A new method decreasing torque ripple for a current source inverter (CSI) drive induction motor system is shown. Unlike a PWM system, this method uses a detailed online simulation to compute an optimal stator current which cannot be realized but is approximated by the realizable stator current vectors. The approximation is done using the concept of time average for the composition of space vectors. Although the second field current cannot be measured, the observer theory assures rapid convergence of the simulated value to the real one. Since the detailed online simulation takes considerable computational time, the experiments are done for relatively low rotational speeds.<>