A NEW FLUX AND STATOR RESISTANCE IDENTIFIER FOR AC DRIVE SYSTEMS

The effect of stator resistance on ac drive performance is analyzed fo r flux vector and indirect field-oriented controllers, A new technique -the back electromagnetic force (BEMF) detector-for reducing the adver se effects of stator resistance on field-oriented control is presented and evaluated through simulation and experimental results. The BEMF d etector is shown to reduce the impact of the stator resistance variati ons and also provide an estimate of the stator resistance. The detecto r is compatible with most control strategies and with or without posit ion feedback.