This paper presents a high dynamic current control and speed estimation strategy for permanent magnet synchronous machine drives without a speed transducer. The strategy is based on the exact linearization methodology and Extended Sliding Mode Observer (ESMO) algorithm. The performances of the proposed control strategy are analysed by simulations for a 1.6 kW PMSM. The obtained   results show the effectiveness of the proposed robust current control approach and speed observation algorithm under load torque and stator resistance variation.

synchronous machine, extended sliding mode estimator, robustness, feedback control.