Hybrid Active-Flux and Arbitrary Injection Position Sensorless Control of Reluctance Synchronous Machines

A new hybrid position sensorless control method for reluctance synchronous machine drives is presented in this paper. The active-flux (AF) and arbitrary injection position estimation techniques are combined for the first time in this hybrid controller. The controller switches between estimation techniques depending on speed and load. A hysteresis region is implemented with phase-locked loop synchronization for dynamic and stable changeovers between estimators. Implementation of the AF method at high loads allows for extended sensorless torque capabilities at high speed.