High performances of fuzzy self-tuning scaling factor of PI fuzzy logic controller based on direct vector control for induction motor drive without flux measurements

This study investigates a rotor flux sliding-mode observer for a fuzzy self-tuning scaling factor of fuzzy logic controller based on direct vector control for induction motor (IM). The rotor flux sliding-mode estimator detects the rotor flux components in the two-phase stationary reference frame using the motor electrical equations. The flux estimation accuracy is guaranteed through the current observer .i.e. the error between the actual current and observed current converges to zero which ensures the accuracy of the flux estimation. In order to achieve a robust speed dynamic response even under severe variation of some key parameters such as rotor resistance/self-inductance, and inertia, a simple design of the scaling factor fuzzy tuning procedure of a fuzzy logic controller (FLC) for speed regulation is proposed. Moreover in order to improve the field-orientation robustness with respect to parameter variation, sliding-mode controller was incorporated for rotor flux regulation. The proposed scheme is recommended for applications requiring robust speed control and field-orientation even in presence of some key parameters deviation. The performance of the suggested scheme has been tested via some simulation results.