可控励磁直线同步电动机滑模控制的研究

Research on sliding mode control for controllable excitation linear synchronous motor

在磁悬浮可控励磁直线伺服系统中,对于外部不确定性扰动和系统自身参数摄动的问题,提出一种全过程都具有鲁棒性的滑模控制,让状态轨迹全程沿着滑模面运动。同时,针对滑模控制会产生抖振的缺点,采用双曲正切函数柔化控制输入信号,以达到实现直线同步电动机数控机床磁悬浮平台精确控制的目的。在Matlab环境下对控制系统进行仿真分析,结果表明在该控制策略下,可控励磁直线电动机磁悬浮伺服系统对外部扰动和自身参数摄动具有良好的鲁棒性,并且减小系统的抖振,从而验证该控制方法的有效性。

There are the problems of parameter perturbation,external disturbance in the magnetic levitation controllable excitation linear servo system.Therefore,in order to realize the precise control,the sliding mode control with robustness is proposed.The state trajectory is moved along the sliding surface.At the same time,for the shortcomings of sliding mode control chattering,the hyperbolic tangent function is used to soften the control input signal.The simulation research is carried out with the Matlab software.simulation results show that the magnetic levitation controllable excitation linear servo system has robustness for the external disturbance and parameter perturbation,and reduces the chattering of the system.The result of simulation prove the effectiveness of the control strategy.