永磁同步直线电机的模糊滑模变结构控制的研究

Research on PMLSM Based on Fuzzy Sliding Mode Variable Structure Control

文章研究的对象永磁同步直线电机是一个复杂的非线性时变系统,如果系统采用滑模控制器后,控制器对动子磁链和推力脉动造成的误差有较强的鲁棒性。然而滑模控制中存在诸如抖振及响应速慢的问题,为了解决如上提及的问题,文章设计了一种基于模糊滑模变结构的控制器,来改善不良的现象。控制器在趋近运动段运动时,采用了指数趋近律的方法,此举可以使永磁同步直线电机系统快速到达切换面,在滑模运动段采用模糊算法实现滑模的切换控制,并利用Matlab软件的Simulink工具进行仿真。仿真结果表明,文中提出的控制结构与传统的滑模变结构控制相比,可使系统行之有效地削弱滑模切换控制随之带来的抖振问题,提高系统的稳定性,并加快系统的响应速度。

PMLSM is a complex nonlinear time-varying system,and the error caused by the rotor flux linkage and thrust fluc- tuation has strong robustness by sliding mode variable structure controller. A fuzzy sliding mode variable structure controller was designed to solve the complicated problem of chattering and slow response in the sliding mode control.This controller used exponential approach law in reaching motion ,and the system reached the sliding surface quickly.The sliding mode switch con- trol was realized by using fuzzy control in was used in simulation by Matlab/Simulink.The simulation results show that the al- gorithm can make the system can effectively weaken the chattering of the sliding mode switch control,and accelerate the re- sponse speed of the system compared by the sliding mode variable structure controller.