Abstract
A maximum torque per ampere (MTPA) sensorless control method for synchronous reluctance motor (SynRM) drive based on mixed high frequency signal injection is proposed in this paper. MTPA control strategy is achieved by virtual signal injection, which can avoid disadvantages of conventional MTPA methods such as low robustness to parameter variation and low dynamic performance. Additionally, the high frequency signal injection (HFSI) based method and extended back-EMF based method are respectively applied for the sensorless control of SynRM in the full speed range. The rotor position estimation errors caused by magnetic saturation and cross-coupling effect are specially considered. The validity of the proposed method is verified on a 3kW SynRM drive system.
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