Adaptive sliding mode sensorless vector control of induction motor using sliding mode MRAS observer

This paper deals with sensorless vector control of induction motor (IM) based on model reference adaptive system (MRAS) theory and sliding mode technique. An adaptive-gain supertwisting (ASTW) sliding mode speed controller is designed to provide good speed tracking performance in the presence of load torque variation. A stator current and rotor flux sliding mode observer (SMO) is designed, which is insensitive to model uncertainties and parameter variation. By replacing the reference voltage model of conventional MARS with the SMO, the rotor speed can be estimated more precisely and improve the control performance. The proposed drive system is simulated using MATLAB/SIMULINK to verify the effectiveness and robustness.