Encoderless field-oriented control of a synchronous reluctance machine with position and inductance estimators

A rotor position estimator for a synchronous reluctance machine (SynRM) is presented. The rotor position is directly calculated based on stator current measurements and voltage commands. For position information, two machine parameters are required, stator resistance and average inductance. The average inductance is estimated online as it is operation-point dependent. The two estimators are linearly independent and can be combined. The performance is demonstrated with experimental results.