| PMSM servo system which is the core technology of KDF2 glycerol spray realizes the uniform spray by controlling valve position precisely. In this dissertation, a system based on sliding model variable structure control (SMC) by using DSP TMS320LF2407A as the main controller is designed. According the feature of strong robustness, fast transient response and etc which SMC has, the system realizes the expected high-performance. The main tasks finished by this dissertation as fallows:Firstly, built the position, speed and current three closed-loop system, introduced the math model of PMSM and the theory of vector control, then determined the current loop PI strategy based on id=0,the space vector pulse width modulate (SVPWM) control method, to satisfy the high accurate position adjusted.Secondly, the dissertation elaborated a cascaded SMC to realize position and speed double closed-loops based on lots of theory and design method about SMC, introduced the design progress details, improved the controller by utilizing the weighted integral switch gain and boundary-layer method to weak the chattering caused by the high frequency switch. The simulation result showed that the system met the basic requirement of the valve position accuracy.Thirdly, finish the servo system hardware and software design based on DSP, make ready for realize the system. The dissertation present the structure module like intelligent power module (IPM), rotor position detect circuit and current voltage detect circuit; beside this, still show the system main flow diagram, interrupt flow diagram, and algorithm about how to detect rotor start position and realize SVPWM.Fourthly, apply the servo system controlled by PMSM SMC to KDF2 glycerol spray system, satisfy the requirement control accuracy of valve position, and improve glycerol performance of the system greatly. |
