Sensorless Direct Torque Control of induction motor using sliding mode flux observer

This paper presents Direct Torque Control (DTC) of induction motor (IM) drive based on a Sliding Mode Flux Observer (SMFO). The major problem of the conventional DTC is the variation of the machine's parameters, such as the stator resistance. This variation produces noticeable flux distortion, which leads to the degradation of the system's performance. Furthermore, in practice, the state variables are not all available for measurement. Consequently, SMFO is introduced to ensure a robust control of IM against noise and parameter variations without involving sensors for speed and stator flux, which increase the cost of the system and reduce its reliability. The simulation results on MATLAB/Simulink are presented to verify the feasibility and effectiveness of the proposed structure.