Optimization And Realization Of Permanent Magnet Synchronous Motor Servo Control System Based On Parameter Identification

The ever-increasing demand for mobile satellite communications requires a"pass-in-motion"servo system with higher accuracy and faster response to ensure the performance and efficiency of speed and angle tracking.In terms of servo motor position following control,classic PID control is still a widely used control method in permanent magnet AC motor servo system.In the past,a lot of research has focused on the control method,but the control performance is not completely determined by the control method.In the control method,parameters such as stator inductance,resistance,and motor moment of inertia also have a great impact on the performance.In this regard,this paper aims to design an online self-tuning method for the cut-off frequency parameters of the AC permanent magnet synchronous motor servo control system based on the identification of the motor rotational inertia parameters,so as to realize the accurate tracking of the signal of the AC motor in the given speed and angle following tasks.,so that the radar antenna in the mobile satellite communication facility can be directed to the satellite more efficiently and accurately.This paper deeply understands the research status at home and abroad in related fields,and introduces the permanent magnet synchronous motor and servo system.The zero d-axis current control strategy in the vector control method of the permanent magnet synchronous motor is selected,the mathematical expression of the transfer function in the speed loop is deduced,and the parameters in the speed loop are modified and perfected.Aiming at the problem of low system timeliness and accuracy caused by the change of permanent magnet synchronous motor parameters,various parameter identification methods of the motor are analyzed and evaluated.An offline identification method for moment of inertia.In order to further improve the working stability and control performance of the permanent magnet synchronous motor,the PI parameters of the speed loop are calculated and assigned according to the results of the moment of inertia identified offline.Taking the parameters designed without parameter self-tuning scheme as the initial control parameters,by traversing the different kvalues of the speed loop at various speeds,the optimal kvalue at each speed is selected,and then the optimal cut-off frequency at each speed is calculated,The relational expression between the speed and the cut-off frequency is fitted,and the relational expression and the moment of inertia value are added to the traditional PID servo control system,and finally an online self-tuning scheme of the speed loop control parameters of the permanent magnet synchronous servo system based on parameter identification is formed.The simulation results show that the dynamic performance is greatly improved compared with the traditional PID.In order to test and verify the performance of the online self-tuning servo control system based on parameter identification,a set of permanent magnet synchronous motor servo system is developed in this paper,the hardware circuit for position following is designed,the DSP-based control system is established,and the parameter online self-tuning program is developed.And the system driver,built the permanent magnet synchronous motor servo control system experimental platform.It is concluded that the method studied in this paper has better position tracking accuracy and efficiency than traditional PID control.