Comparative Analysis of Speed Control of PMSM using PI-Controller and Fuzzy Controller

This paper presents the methods used in speed control of Permanent magnet synchronous motor (PMSM) drives. Permanent magnet synchronous motor(PMSM) are widely used in AC servo drives because of its high torque to inertia ratio, high power density, high efficiency and power factor as compare to the other motors used in drives. The study shows that the methods used to improve the performance of PMSM drives, but in some case, when the dynamics of the system vary over time or with operating conditions, the performance of the PI controller will be spoiled. So that in proposed method FC controller is used in place of PI controller to improve the performance of PMSM drives. The Fuzzy Controller (FC)) used as a speed controller seems to be a promising solution in this purpose. This paper presents a Fuzzy Controller (FC) for speed control of a PMSM drive by using the Fuzzy Logic (FL) approach applied to speed control leads to an improved dynamic behavior of the motor drive system and an immune to load perturbations and parameter variations. The simulations of both the controllers have been carried out in MATLAB and Simulink. Speed responses, obtained under PI and FL speed control, are compared for a variety of operating conditions. FLC controlled PMSM generates a superior speed response and provides satisfactory output.