Position sensorless control for synchronous reluctance machine based on instantaneous power optimization

This paper proposes a new method of position sensorless control for synchronous reluctance machine (SynRM). The position sensorless scheme is based on the instantaneous power optimization the feature of which takes a specific control axes on reactive and real power and realizes both rotor speed estimation and tracking to the point of the maximum torque per current. Adopting the signal injection onto the phase angle of the current, the point of the maximum torque operating per current can be traced without dependency on the machine parameters. The effectiveness of the method is verified by experimental results.