数控机床进给系统三电平直线电机模型预测转矩控制

Model Predictive Torque Control of Three-level Linear Motor based on Feed System of CNC Machine Tool

针对高速、高响应数控机床的控制要求,本文构建了三电平永磁同步直线电机(Permanent Magnet Synchronous Linear Motor, PMSLM)进给系统,其单管耐压要求低,开关损耗小等特点可更好实现高功率因数及高功率密度需求,基于此系统引入的模型预测转矩控制算法针对被控对象逆变器功率器件整体离散的特性,通过价值函数值得出最优矢量对被控系统进行调节,使该控制系统具有更好的动态响应特性和鲁棒性。利用Matlab/Simulink构建了三电平永磁同步直线电机模型预测转矩控制仿真模型,并对静态和动态运行特性分别进行分析,仿真结果验证了该系统具有更好的稳态控制特性。

According to the control requirements of high-speed and high response of CNC machine tools, this paper constructs a three-level permanent magnet synchronous linear motor(PMSLM) feed system. Because of the characteristics of low single transistor withstand voltage and low switching loss, it can better match the requirements of high power factor and high power density. Therefore, the model predictive torque control algorithm introduced in this system aims at the discrete characteristics of the inverter power devices of the controlled object, and adjusts the controlled system through the value function to adjust the controlled system, so that the control system has better dynamic response characteristics and robustness. The model predictive torque control simulation model of three-level permanent magnet linear synchronous motor is constructed by using Matlab/Simulink, and the static and dynamic operation characteristics are analyzed respectively. The simulation results verify that the system has better steady-state control characteristics.