On The Vector Control For Permanent Magnet Synchronous Motor With Varied Reactance Parameters

Due to the advantages of small size, high efficiency, high power density, the high performance drive system of Permanent Magnet Synchronous Motor(PMSM) has played a decisive role in the motion control system and has been widely used in various industry. The variation of PMSM reactance parameters with operating conditions has directly influences the dynamic and steady state performance of the speed servo system.Aimed at the problem about the variation of PMSM reactance parameters, the off-line calculated reactance parameters have been applied in the control system by means of online look-up table in this thesis. By use of the fuzzy PI control, the PI parameters online correction has been carried out and the dynamic and steady state performance of the speed servo system of PMSM has been improved.In order to make full use of the reluctance torque of Interior Permanent Magnet Synchronous Motor (IPMSM), the control strategy of Maximum Torque Per Ampere (MTPA) has been studied from theory based on the mathematical model of IPMSM. When the torque is certain, the electric current vector phase angle of the minimum stator electric current has been deduced according to the extremum principle, and the optimal allocation relation of d, q axis electric current has been determined in the control of MTPA.Then, traditionally, the values of the reactance parameters are constant, but reactance parameters via off-line calculated will be applied to the control system by online look-up table in this thesis. Aiming to varied parameters lead to system response is unable to accurately and real-time track the given, For this problem, speed controller using fuzzy PI control in the thesis. Through the fuzzy PI control, the online correction of PI parameters has been carried out and the dynamic and steady state performance of the speed servo system has been enhanced.Finally, the numerical simulation has been carried out for PMSM vector control system with constant parameters and PMSM vector control system with variable parameters by use of Matlab/Simulink. The two system adopt the tradition PI control and the fuzzy PI control respectively. The simulation results are analyzed and compared. The contrastive analysis consequences show that the change reactance parameters of PMSM servo system with the fuzzy PI speed control has better robustness and static and dynamic performance.