Sensorless Fault Tolerant Control for Induction Motors
Résumé
In this paper, a sensorless fault tolerant controller for induction motors is developed. In the proposed approach, a robust controller based on backstepping strategy is designed in order to compensate both the load torque disturbance and the rotor resistance variations caused by the broken rotor bars faults. The proposed approach needs neither fault detection and isolation schemes nor controller recon guration. Moreover, to avoid the use of speed and ux sensors, a second order sliding mode observer is used to estimate the ux and the speed. The used observer converges in nite time and permits to give good estimates of ux and speed even in presence of rotor resistance variations and load torque disturbance. Since the used observer converges in nite time, the stability of the closed-loop system (controller + observer) is shown in two steps. First, the boundedness of the closed-loop system trajectories before the convergence of the observer is proved. Second, the convergence of the closed-loop system trajectories is proved after the convergence of the observer. To highlight the ef ciency and applicability of the proposed control scheme, simulation and experimental results are conducted for a 1,5kW induction motor
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