Robust IM exponential reaching law sensorless control with MRAS-based online parameters identification

Lot of works dealt with the robustness of the indirect rotor flux oriented control (IRFOC), however variation of electrical parameters of induction motor (IM), due mainly to the external condition like warming, cause the major problem of this techniques. In this work, we investigate and introduce a method called exponential reaching law (ERL) technique in the sliding mode controller to improve the control performance and remedy to the boring chattering phenomena. So the suppression of the chattering and the increasing of the reaching speed to the sliding surface is our first aim. As well, to get an adaptive sensorless scheme, a three classical proportional-integral controllers (PI) are included in the adaptation mechanism of the model reference adaptive system (MRAS) to obtain a conjoint online estimation of the rotor speed, the stator resistance (R_S) and the inverse of the rotor time constant (1/T_r) respectively. The proposed control technique is experimentally tested via the (RTI) blocks of Matlab/Simulink, and the dSPACE DS1104 card.