A New DC-Bus-Voltage-Robust Sensorless Control for Switched Reluctance Motors

Abstract

This paper describes a new sensorless control technique for switched reluctance motors. The proposed system injects voltage pulses into the two unexcited windings and observes their currents. Timing signals for commutating the inverter are generated by comparing these currents. Almost no predetermined parameters are required for system setup. In the experiments, the proposed drive system is verified at 1000 and 3000min^-1 under load. The system achieves acceptable commutation timing accuracy and provides robustness to DC-link voltage ripple and to output torque.