Improved performance of PMSM speed responses using a hybrid Fuzzy/ PI controller

This paper presents an improved performance of a Permanent Magnet Synchronous Motor (PMSM) using a hybrid Fuzzy/ Proportional-Integral (PI) controller. Hybrid control has an advantage of integrating a superiority of two or more control techniques for better control performances. A fuzzy controller offers better speed responses for start-up and large reference input changes (large speed error) as compared to a Proportional-Integral controller. Nevertheless, a rules-based fuzzy controller is limited to a particular operating condition. If the nature of the load torque is varied, the steady-state error of the fuzzy logic controller will be significant. The Proportional-Integral controller has good adaptability over load torque variation and can maintain high steady-state accuracy. However, the transient responses are quite poor. This study has incorporated a Fuzzy and PI into the control of PMSM to improve its dynamic speed performances. The simulation is carried out using Matlab Simulink.