Research And Implementation Of Control Parameter Optimization For Permanent Magnet Synchronous Servo System

It is the permanent aim for numerical control field to improve machining speed under the premise of ensuring machining quality.Permanent magnet synchronous servo system is the control core of NC(Numerical Control)machine tools,its performance has a direct impact on the machining quality for machine tools.The traditional PI control can't guarantee lasting system performance.What's worse,if system external conditions change,speed fluctuation is lager and recovery time is longer.Therefore,control parameter optimization method of permanent magnet synchronous system is studied in this paper.The main work of this paper can be summarized as follows:1.The vector control strategy is introduced,system control block diagram is established and transfer function of each loop is analyzed on the basis of it.By employing pole pair cancellation method and target system comparison method,initial control parameters for current loop,velocity loop and position loop are designed respectively.Moreover,response performance for three loops are analyzed in the aspect of time domain and frequency domain;2.It is proved by theoretical analysis that an offline control parameter optimization method based on SRM(Simplex Replacement Method)is adopted,ITAE(Integral of Time and Absolute Error)evaluation function which can reflect system comprehensive performance is selected.Meanwhile,SRM performance are compared with PSO(Particle Swarm Optimization),and ZN(Ziegler-Nichols)algorithm by SIMULINK,simulation results show the effectiveness of SRM;3.In order to improve system robustness for external working conditions,an online control parameter optimization method based on FC(Fuzzy Control)is adopted.By establishing 49 kinds of FC rules,the relationships between velocity error,its variation and control parameters variation are obtained.Under the condition of no-load and load mutation,compared with traditional method,simulation results show that FC method can improve system response performance and adaptive ability;4.The platform for permanent magnet synchronous servo system based on hardware-in-the-loop simulation is built,and two kinds of experiments for no-load and load mutation are carried out.The hardware platform is configured based on DS1005 and DRV8312,software platform is designed by SIMULINK and interactive interface is built by ControlDesk.The correctness of the strategy proposed in this paper is verified by the experimental results.