Rotor Position Robust Estimation Method for Sensorless IPMSM at Low Speeds Including Standstill Operation

Gaolin Wang; Gang Li; Yong Yu; Fan Zhang; Dianguo Xu
September 2011
International Review of Electrical Engineering;Sep/Oct2011 Part A, Vol. 6 Issue 5, p2329
Academic Journal
A robust position observer of sensorless interior permanent magnet synchronous motor (IPMSM) adopting high frequency signal injection was proposed for low- and zero-speed operation. Rotor position error signal was obtained from magnitude of the produced high frequency currents by using pulsating high frequency voltage injection method. Both signal process and digital filter design were analyzed carefully. On the basis, a rotor position observer with improved robustness to load torque disturbance was presented. Theory design method for the robust observer was carried out considering the dynamic characteristic of load torque change. And pole assignment method was adopted for linear feedback matrix selection of the observer according to load disturbance and expected position estimation error. Experimental results demonstrate feasibility of the robust position estimation scheme by an IPMSM sensorless vector control drive.


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