Feed forward field orientation control of an induction motor using a PWM voltage source inverter and standardized single-board computers

The implementation of a speed-control regulator for an induction motor with single-board computers and as much standardized hardware as possible is described. The improvements over previous attempts include mainly the use of gating pulse patterns previously stored in the memory of a computer board, the use of coprocessing, and of a technique combining both software and hardware to sample motor currents with the required accuracy. The experimental system proved stable and robust against variations of rotor resistance and responded well to step-input changes