Adaptive Discrete-Time Quasi-Sliding Mode Control of Induction Motors

This paper proposes an adaptive discrete-time sliding mode control approach for the position control of induction motors. Based on the theoretical analysis of reaching conditions, the quasi-sliding mode band is designed to be variant, which can improve the dynamic performance of the system before its states enter into the quasi-sliding mode band. The proposed control scheme can overcome the existing system uncertainties included both the internal parameter variations and the external disturbances. At the same time, the system could achieve a fast convergence of high accuracy and robustness can be strengthened greatly. Simulated results verified the effectiveness and high-performance dynamic characteristics of the method in position control of induction motors.