Study on the Servo System with Permanent Magnet Synchronous Motor Based on Sliding Mode Control

Study on the Servo System with Permanent Magnet Synchronous Motor Based on Sliding Mode Control
　　With the development of modern industrialization, AC servo system with permanent magnet synchronous motor (PMSM) is widely used in many areas. PMSM with high performance is demanded, as for exact radar and military weaponry device,high speed, high precision, high reliability and stronger anti-interference ability are especially significant. Because of the advantages of robust and easy realization, sliding mode control (SMC) theory is being applied in the Magnetic lifter electric drives gradually. Based on the comprehensive research on the mathematic model of PMSM and control theory, in order to overcome the blight caused by parameter variant and outside disturbance, the SMC theory is adopted to realize AC servo system of high performance with adaptation.
　　The contents of this research fall into the following:The control technique of the AC servo system was analyzed theoretically and simulated. After that, a set of research equipment of PMSM servo system was built up. With the traditional PI controller, it has excellent low-speed performance and fine tracking performance.To improve the speed and robust of the system, a SMC controller was introduced. Different SMC strategies under different conditions were compared and validated through simulation and experiment. For the speed servo system, the control effect of the SMC controller and PI controller were compared, the results showed the former‘s superiority. http://www.999magnet.com/ For the position servo system, the speed was uncontrollable under the traditional SMC controller. An improved SMC controller was proposed to solve that problem. Besides, the chattering caused by high frequency switching control was studied and decreased effectively.Simulation and experiment results show the whole system works with nice performance, flexible function,and good ability to resist the disturbance, which substantiate that it can meet the requirement.