| Servo systems are ever-increasingly utilized in many fields, including industrial controllers and household appliances. Meanwhile, higher control performance of servo products with lower cost is also a subject of great interest world widely. Digital controlled AC servo system, using PMSM as power converter, controlled by DSP with advanced control strategies, is a trend.With the theory and characteristics of PMSM vector control analyzed, and the FOC strategy employing i_d =0 chosen, the control scheme of PMSM servo system by SVPWM is established with three-close-loop regulators. The simulation model is built in Matlab/Simulink, and the result of PI controller validates the control strategies. After analyzing the mathematical model of PMSM, This paper presents an adaptive fuzzy sliding mode controller for PMSM servo system's nonlinearity and uncertainty. The validity and feasibilities of this method are proved by simulation results. The comparison of PI controller and adaptive fuzzy sliding controller indicates that the adaptive fuzzy sliding controller has better stability for parametric variations and load disturbance. When the adaptive control is depressed, the robustness against load disturbance is worse. That verifies the importance of adaptive control against load disturbance.The servo system's experiment platform is based on the hardware of Freescale DSP56F8357, and the software design is accomplished in Codewarrior integrated development environment. The results from PC master verify the validity and practicality of the investigation...
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