Sliding Mode And Back-Stepping Control Strategy Of Permanent Magnet Linear Synchronous Motor

The linear motor attracts people's more attention increasingly after the research and development over one century. The progress on high-velocity machining technology has accelerated the applications of linear motors to machine tools especially. Now some motor manufacturers and academic institutions have had the ability to produce linear motors, but the progress is still slow in the servo control systems of linear motors. The control methods of permanent magnet linear synchronous motor(PMLSM) have been studied. The thesis is based on project background of the Provincial Natural Science Foundation titled"high precision permanent magnet linear motor feeding and servo system (No: 20082042)". The content of this research falls into the following:In chapter 1, this thesis introduces the basic principle and of PMLSM and control method of PMLSM,then the advantages and disadvantages are analyzed.In chapter 2, the mathematics model of PMLSM and the simulation control system of PMLSM based on SVPWM are built. The simulation results show the precision and robust performances of servo system are influenced by load disturbances and motor parameters variations.In chapter 3, the study brings forward back-stepping control based on nonlinear control strategy which is applied to the velocity tracking controller design of PMLSM control system. Comparing with vector control, velocity tracking precision is improved and this method has a few designed parameters and can be realized easily. The design rule of back-stepping makes the system global asymptotical stabilization with Lyapunov function. The disadvantages of back-stepping are sensitive to uncertainties.In chapter 4, considering parameters change during the PMLSM operating, a speed tracking control strategy is proposed, combining back-stepping control with variable structure control (VSC). The design can not only provide better velocity tracking performances, but also assert system robust performances under motor parameters and load variations.In chapter 5, the hardware of the system consists of TMS320F2812, IPM and other supporting components. TMS320F2812 is the core of the control elements and IPM is the core of the power drive. At last the hardware circuit and the software flowchart are designed.In chapter 6, the study conclusions of the thesis are summarized, and the further research works are forecasted.