Robust Sensorless Speed Control of SPIM based on MRAS Sliding Mode Adaptation Mechanism

With the aim to achieve high dynamic performances under system uncertainties and load torque even at very low speed range, this paper presents a novel robust sensorless speed vector control strategy for single phase induction motor (SPIM). The proposed strategy includes a speed controller and a model reference adaptive system (MRAS) estimation algorithm of rotor speed both are based sliding mode technique. The proposed speed controller, qualified as proportional integral sliding mode controller (PISMC), use an online self adaptive switching gain. The speed PISMC is designed without need of uncertainties or external disturbances bounders’ determination usually mandatory for the design of sliding mode controllers. As well, the developed MRAS adaptation mechanism is formed of two control law terms, equivalent and nonlinear one with fixed switching gain. Therefore, sublimate algorithms to estimate parameter variation at very low speed range in order to maintain high drive performance are not required. The stability of both of them is proved using Lyapunov approach. Extensive computer simulations highlight the effectiveness of the proposed sensorless speed control strategy under parameters variations and load torque. Robust Sensorless Speed Control of SPIM based...− N. ZAIDI et al. 1865