永磁同步电机动态滑模速度控制

Dynamic Sliding Mode Speed Control of PMSM Based on DSP

为提高永磁同步电机(PMSM)伺服系统的控制性能,削弱系统中存在不确定性的影响,并解决传统滑模控制(SMC)技术中存在的抖振问题,提出一种动态滑模控制(DSMC)方法。首先,在建立PMSM数学模型的基础上,设计传统的PID型SMC方法,同时,为削弱系统抖振现象并进一步提高系统的鲁棒性,设计了DSMC方法。DSMC可以通过增加一个附加的动态变量来获得分层的滑动面,进而保证系统具有快速的、精准的速度跟踪性能。最后,通过MC56F8346 DSP控制核心验证所提方法的有效性,实验结果证明,所提出的DSMC方法相比于传统SMC能更快更好地跟踪速度给定信号,并且具有更强的鲁棒性。

In order to improve the control performance of permanent magnet synchronous motor(PMSM)servo system,weaken the influence of uncertainty in the system,and solve the chattering problem in traditional SMC technology,a dynamic sliding mode control(DSMC)method was proposed.Firstly,based on the PMSM mathematical model,the traditional PID type SMC method was designed.At the same time,the DSMC method was designed to weaken the chattering phenomenon and further improve the robustness of the system.DSMC can obtain a hierarchical sliding surface by adding an additional dynamic variable,so as to ensure that the system still has fast and accurate speed tracking performance in the presence of parameter changes,external disturbances and other uncertainties.Finally,the validity of the proposed method was verified by the MC56F8346 DSP control core.The experimental results show that the proposed DSMC method can track the given signal faster and better than the traditional SMC,and has stronger robustness.