Implementation of stator resistanceadaptation for sensorless speed control of IPMSM drive based on nonlinear position observer

This paper deals with a new method of on-line stator resistance identification based on model reference adaptive systems (MRAS) technique for high performance sensorless speed control of interior permanent magnet synchronous motor (IPMSM) drive. In order to estimate the rotor position, a nonlinear position observer algorithm based on the IPMSM fluxes is proposed. The nonlinear observer is constructed using the flux linkage as a new state variable without speed dependence. The nonlinear observer estimated the rotor position by using a trigonometric function. The reference and adjustable models, developed in the d-q synchronous reference frame, are used in the MRAS scheme to estimate the stator resistance from measured terminal voltages and currents. Finally, experimental results validate the correctness and effectiveness of the proposed sensorless speed vector control. The experimental implementation is carried out on powerful dSpace DS1103 controller board.