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While conventional P, PI, PID controllers are widely used in industries they exhibit poor performance and sluggish response when applied to an induction motor drive. These controllers are even very sensitive to parameter variations and also have stability issues. But the advancement in fuzzy logic has made fuzzy logic controllers more robust, accurate and fast. In this paper, a scalar V/f control strategy is implemented with fuzzy logic controllers of different structures like PI, PD and PID. Then the performance of the drive system is simulated and evaluated. Our results show that PID type fuzzy logic scheme gives a superior performance as compared to PI and PD type controllers. The modeling of induction motor and control scheme are done using Matlab/Simulink.

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Because of its low maintenance and robustness, induction motors have many applications in the industries. Most of these applications need fast and accurate speed control system. This paper investigates about the basic control process of induction motor i.e. scalar V/F control with a conventional PI controller. Then a sliding mode controller is designed and implemented for the performance improvement of the system. Induction motor is modeled in the synchronous reference frame. The induction motor is supplied through an inverter. The model is carried out by using Matlab/Simulink. The simulation results have been discussed in the paper. Nomenclature:The dynamic model of induction motor is derived by transforming the three-phase quantities into two phase direct and quadrature axes quantities. The equivalence between the

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