永磁直线同步电动机直接推力控制系统的优化设计

Optimization design of direct thrust control system of permanent magnet linear synchronous motor

目的:对永磁直线同步电动机(permanent magnet linear synchronous motor,PMLSM)的传统直接推力控制(direct thrust control,DTC)系统进行优化设计,以提高其抗干扰性和稳定性。方法:采用空间矢量脉冲宽度调制(space vector pulse width modulation,SVPWM)技术代替传统DTC系统中的开关状态选择表,并在其中引入"预测"的思想,对电压空间矢量进行细分优化,并对定子磁链和推力进行误差补偿。将该方法应用于实验室电动机,首先在Matlab/Simulink环境下搭建控制系统各重要部分的仿真模型,进行仿真实验,然后搭建优化改进后整个控制系统的仿真模型,最后将仿真实验结果与传统直接推力控制系统仿真结果进行比较。结果:从仿真图形上可看出,优化后系统的动态响应速度基本不变,但其抗干扰性提高,稳定性更好。结论:该方法可应用于电梯、自动感应门、电动护理床等要求直线运动的场合,使此类直线电动机控制系统的设计更加理想。

Objective To improve the anti-interference performance and stability of the direct thrust control （DTC） system of the permanent magnet linear synchronous motor （PMLSM）. Methods The switch state selection table of traditional DTC system was replaced by space vector pulse width modulation （SVPWM）, and the ＂prediction＂ thinking was introduced. The voltage space vector was subdivided and optimized, and the errors of stator flux linkage and thrust were compensated. The method was applied to the laboratory motor. At first, the simulation models for the important parts of the control system were built under Matlab/Simulink environment, and simulation experiments were carried out. Then the simulation model of the improved control system was established. Finally, the simulation results are compared with the those of the traditional DTC system. Results It＇s proved that the system gained high anti-interference performance and stability with the dynamic re sponse speed kept constant.Conclusion The method proposed can be used for the optimization of DTC system of the conditions with linear motion, including elevator, auto door, electric nursing bed and etc.