基于改进锁相环型PMSLM无传感器控制

Sensorless Control of Permanent Magnet Synchronous Linear Motor Based on Improved Phase-Locked Loop

针对传统锁相环在估算电机磁极位置时会出现抖振现象,造成估算速度包含脉冲尖峰,引起速度环PI调节器饱和导致动态响应差的问题,提出了一种采用闭环控制滑模观测器估算得到的磁极位置和速度信号的新型锁相环结构。该方法通过对估算位置角与反馈位置角分别求余处理,能够消除估算位置角抖振造成速度跳变,获得平滑的电机速度信号,提高驱动系统的抗干扰和容错能力。搭建了仿真模型和实验平台,仿真和实验结果均表明,该方法能够消除磁极位置抖振、精确估算电机速度,同时具有良好的响应特性。

In order to solve buffeting problems in the motor magnetic pole position estimation using traditional phaselocked loop,which could lead to PI controller saturation and inferior dynamic response,an improved type of phase-locked loop structure was presented which would be able to control the magnetic pole position and estimated speed in closed-loop type.By separately calculating the estimated position angle and the feedback position angle,the method could eliminate the speed jump caused by the estimated position angle chattering,obtain a smooth motor speed signal,and improve the anti-interference and fault tolerance of the drive system.The simulation model and experimental platform were built.Both simulation and experimental results show that this method can achieve an accurate estimate of the pole position and motor speed,and has stable response characteristics.