PMLSM Direct Thrust Control Based On Predictive Voltage Modulation And T-S Fuzzy Control

This thesis is supported by National Natural Science Foundation of China (51075281). To meet the requirements of high-precision micro-feed AC linear servo system, such as visualization, digital, high-precision, high reliability, high speed and ease operation ect, predictive voltage modulation and Takagi-Sugeno(T-S) fuzzy strategy were proposed, and human-computer interaction of PMLSM servo system was designed by Samkoon SA.This thesis firstly analyzed the mathematical model of PMLSM, and builded direct thrust control(DTC) control simulation system based hysteresis. The advantages and disadvantages were analyzed: excellent quickness, but thrust and flux of electromagnetic pulse which seriously affect the performance of the servo system, especially at low frequencies. Secondly, predictable voltage vector modulation technique was introduced, simulation results show that the proposed control system obviously reduces the pulsations of speed and electromagnetic thrust, but is bad at nonlinear perturbations, such as parameter variations with time. Finally, T-S fuzzy controller of speed and electromagnetic thrust were adopted, which not only completely inherites all the advantages of predictable voltage modulation system, and more optimal, but also is more robust to the pulsations caused by nonlinear perturbations.Human-computer interaction of PMLSM servo system was modularly designed by DSP(TMS320F2812) and Samkoon SA, which make interface communicate with DSP, and dynamicly and visually display system commands and feedback parameters. Moreover, traditional DTC system of PMLSM was debugged, and achieved good practical results.