Sensorless Vector Control of PMSM Based on Improved Sliding Mode Observer

This paper proposes a sensorless control algorithm for the permanent magnet synchronous motor (PMSM) based on a new sliding mode observer (SMO), which substitutes a sigmoid function for the signum function. The stability of proposed SMO is analyzed using the Lyapunov stability theorem. Adaptive law of switching gain is regulated with the rotor speed to expand the functional range of SMO. A back-electromotive force (back-EMF) observer is designed to eliminate the high frequency components of estimated back-EMF. An input-normalized phase-locked loop (PLL) is adopted to extract the rotor position and speed for compensating the phase lag resulted from the filter. The simulation results illustrate the validity of the analytical approach and the efficiency of the new sensorless control algorithm for PMSM based on the new SMO.

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