Implementation of a reduced-order Estimator for an Asynchronous Machine drive system Implémentation d'un Estimateur d'ordre reduit pour le control d'une Machine Asynchrone

A reduced-order discrete-time Extended Sliding Mode Observer (ESMO) is introduced, in this paper, for on-line estimation of rotor fluxes and rotor time constant. The satisfying simulations results on Matlab-Simulink © environment and experimental results carried out on a 1,8 kW induction machine demonstrate the excellent performance and high robustness of the proposed ESMO against parameter variations, modeling uncertainty and measurement noise. It is concluded that the implementation in real-time of this reduced-order ESMO in the industrial applications, compared with the full-order ESMO, permit on the one hand to overcome the heavy computational effort, complexity and hard tuning of the estimation algorithm and, on the other hand, to reduce the execution time of the observation with a good accuracy and considerable rapidity.