基于迟滞函数的永磁同步直线电机滑模控制

Sliding Mode Control Based on Hysteresis Function for PMLSM

研究永磁同步电机性能优化问题,由于直接驱动负载,永磁同步直线电机的伺服性能容易受摩擦阻力、波纹推力、负载力等各种扰动力的影响。滑模控制具有对扰动及参数变化不敏感、物理实现简单、响应速度快的特点,但一直存在的抖振问题引起系统的稳定性和精确性差。针对离散变结构控制系统存在的问题,为了提高系统的控制性能,提出了一种新的滑模趋近律,采用迟滞函数代替指数趋近律中的符号函数。仿真方法简单,易于实现。仿真结果表明,控制策略可以提高系统对参数摄动和外在扰动的鲁棒性,有效抑制滑模控制的"抖振"问题,提高了系统控制质量,为设计提供了依据。

Due to driving load directly,the servo performance of Permanent Magnet Linear Synchronous Motor（PMLSM） is influenced by gliding friction,dent force,load force and other external disturbances seriously.The characteristics of Sliding Mode Control（SMC） are insensitive to disturbances and parameters variations,simple in physics realization and quick in response speed.But the existing chattering phenomenon limits its application in reality.Arming at discrete variable structure system,a new sliding mode reaching law is proposed,in which the sign function of exponential reaching law is replaced by hysteresis function.The method is simple and easy to realize.The simulation results verify that the control scheme can make the system have strong robustness to parameter variations and external disturbances,and restrain chattering effectively to ensure the quality of control system.