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 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 synchronisation for dynamic and stable changeover between estimators. Implementation of the active-flux method at high loads allows for extended sensorless torque capabilities at high speed.