新型终端滑模观测器在PMLSM中的应用

摘要

There are problems of low accuracy and high chattering existing in the permanent magnet linear synchronous motor(PMLSM) sensorless control system,when the conventional sliding mode observers are used.In order to improve the estimation accuracy of the position and speed,a second-order-nonsingular-terminal-sliding-mode observer design method,which is based on proportional-Integral(PI) algorithm,was proposed.The method introduces the PI algorithm into the design of the general non-singular terminal sliding surface.It not only could effectively restrain the inherent chattering in the traditional first-order sliding mode,but also reduce the steady-state errors of the estimated values by adjusting the proportional and integral parameters.Furthermore,in order to ensured the stability and the finite time convergence property of the observer,the second-order sliding mode control law of the BEMF was designed.According to the phase-locked loop (PLL) principal,the signals of the position and speed could be demodulated from the BEMF estimated values.Finally,comparative experiments have been done using two typical-traditional sliding mode methods.The results validate the proposed method.%为了提高电机位置和速度的估计精度,提出一种基于比例-积分算法的二阶非奇异终端滑模观测器设计方法.该方法是将比例-积分算法引入到非奇异终端滑模面的设计中,不但可有效地抑制常规一阶滑模的固有抖振,而且可以通过比例和积分参数的调节来改善估计值的稳态误差.同时,为了保证观测器的稳定性和有限时间收敛特性,设计了反电势观测器的二阶滑模控制律,并根据锁相环原理,将位置和速度信号从反电动势估计值中解调出来.最后,通过与2种典型的常规滑模观测方法进行实验对比,结果证明了所提方法的有效性.