Abstract: Aiming at the problem that the traditional PID controller in the permanent magnet synchronous motor (PMSM) vector control system is not efficient in the PMSM control performance and is poor in the adaptability to working environment change, firstly, the mathematical model is established by adopting the dual-axis theory in the two-phase rotating coordinate system; Then, the fuzzy control theory is used to improve the traditional ordinary PID controller of speed loop in the PMSM vector control system, and the fuzzy PI controller is obtained from the theoretical level research and analysis. In Matlab/Simulink environment, a PMSM vector control system simulation model based on fuzzy PI controller is established, and the established fuzzy PI controller is introduced into the PMSM vector control system for simulation experiments. The experimental results show that compared with the traditional PID controller,  the fuzzy PI controller has superior dynamic performance and steady-state performance.

Key words: permanent magnet synchronous motor, vector control, fuzzy control, PID controller, fuzzy PI controller