Globally asymptotically stable reconstruction of flux, rotor position and speed for permanent magnets machines

An original full-order observer is presented for stator fluxes and speed reconstruction for Permanent Magnet Synchronous Machines. The estimation is carried out in a fixed reference frame exploiting the stator currents and voltages as the only known variables. Global asymptotic convergence properties of the proposed scheme are drawn, casting the estimation problem into adaptive systems theoretical framework. Insightful modification to the flux estimation dynamics is proposed in order to improve the observer performance in the low speed region. Simulation tests asses the features of the presented method.