基于扰动补偿磁链观测器的永磁同步直线电机无位置传感器控制

Permanent Magnet Synchronous Linear Motor Based on Disturbance Compensated Flux Observer Sensorless Control

为了提升永磁同步直线电机无位置传感器控制性能,研究了一种基于扰动补偿磁链观测器的无位置传感器控制方法。该方法将陷波滤波器看作扰动观测器并且结合反馈控制器,计算简单,容易实现。观测器中的参数调试也不复杂,对直流偏置和谐波扰动有着比较好的抑制作用,相当于克服了传统磁链观测器最主要的局限性。此外,研究的观测器不会带来磁链幅值和相位的误差。利用锁相环估计位置和速度,进一步提高观测器观测精度。实验证明扰动补偿磁链观测器能够有效减小直线电机运行过程中的动子磁链的估计误差,从而提高动子的位置和速度的估计精度。

In order to improve the position sensorless control performance of permanent magnet synchronous linear motor(PMSLM),a position sensorless control method based on disturbance compensated flux observer(DCFO)was studied.This method treats the notch filter as a disturbance observer and combines it with a feedback controller,making it easy to calculate and implement.The parameter debugging in the observer is not complicated,which has a good suppression effect on DC bias and harmonic disturbance,equivalent to overcoming the main limitations of conventional flux observer.In addition,the observer studied will not introduce errors in the amplitude and phase of the magnetic flux.A phase-locked loop was used to estimate the position and speed,further improving the observation accuracy of the observer.The experiment proves that the disturbance compensated flux observer can effectively reduce the estimation error of the mover flux during the operation of the linear motor,thereby improve the estimation accuracy of the mover position and speed.