Robustness of rotor position observer for permanent magnet synchronous motors with unknown magnet flux
Résumé
We introduce a new sensorless rotor position observer for permanent magnet synchronous motors which does not require the knowledge of the magnet’s flux : only electrical measurements and (approximate) knowledge of the resistance and inductance are needed. This observer extends the gradient observer from Lee et al. [2010] with the estimation of the magnet’s flux and makes it globally convergent provided the rotation speed remains away from zero. We study its sensitivity to uncertainties on the resistance and inductance and to the presence of saliency. Its performances in open-loop are illustrated via an implementation using real data and compared to other existing magnet flux independent observers in terms of computational cost and robustness.