A new approach for estimation of electrical parameters and flux observation of permanent magnet synchronous motors

International audienceIn this paper, a new class of estimators for permanent magnet synchronous motors is proposed. Using a novel representation of the permanent magnet synchronous motor dynamics and some suitable filtering, we obtain new solutions to two important problems: (a) estimation of the stator resistance and inductance and (b) flux estimation with known electrical parameters. Neither one of the schemes requires knowledge of the mechanical parameters nor of the magnetic flux constant. Conditions for global convergence are given in terms of persistency of excitation requirements that, for the flux observation problem, is imposed only to the rotor speed. Both stability proofs require the availability of rotor speed. However, for the flux observer, extensive simulations using the speed estimate obtained from the estimator (instead of the actual rotor speed) illustrate the robustness of the proposed scheme vis-à-vis this assumption. Simulations also show that the new flux observer outperforms other existing designs. Copyright ©2015 John Wiley & Sons, Ltd