Full Range Permanent Magnet Synchronous Motor Position and Speed Estimation using Adaptive Non-singular Fast Terminal Sliding Mode Observer

Full range speed and position estimation of permanent magnet synchronous motors is a challenging task. In this paper, a nonsingular terminal sliding mode observer is proposed for fast and precise estimation of speed and position. It is shown that adaptive gain in proposed method not only helps to reduce chattering problem in low speed range considerably but also decreases estimation error in nominal speed. Furthermore, in order to accurately estimate the rotor position in the reverse speed, a quadrature-component-based phase lock loop is utilized instead of arctan function. Finally, to illustrate effectiveness of proposed method, simulation results using MATLAB/SIMULINK is provided.