用于永磁同步直线电机无传感器控制的新型滑模观测器

A new sliding mode observer for sensorless control of permanent magnet synchronous linear motors

为实时检测永磁同步直线电机(PMSLM)的速度和磁极位置以实现对PMSLM直接驱动系统的无传感器控制,基于滑模变结构控制理论,设计了一种新型高速滑模观测器,该滑模观测器利用Sigmoid函数作为控制律中的切换函数,能有效地消除滑模抖振和提高运算效率。仿真和实验结果表明,这种基于Sigmoid函数的滑模观测器能够高速、精确地估计电机速度和磁极位置,从而代替机械传感器实现高性能的PMSLM无速度传感器控制。

In order to conduct the real-time measurement of a permanent magnet synchronous linear motor （PMSLM） ＇ speed and position so as to achieve the sensorless control of its direct drive system, a new high-speed sliding mode observer was designed and implemented based on the sliding mode variable structure theory. The sliding mode ob- server uses a Sigmoid function as the switching function of the control law, so it can effectively eliminate the sliding mode chattering and improve its response rate. The sesuhs of the simulation experiments show that the proposed slid- ing mode observer based on Sigmoid function can be used to estimate the moter speed and position of accurately and rapidly, to realize the high-performance sensorless control for PMSLMs.