永磁直线同步电机驱动系统速度和位置无传感器检测新方法

摘要

为了实现永磁直线同步电机(PMLSM)无传感器伺服控制,必须估计出电机的速度和磁极位置.本文提出了一种通过电机电流和电压信号估计PMLSM速度和位置的简单方法.在建立PMLSM三相电压模型的基础上,通过park变换,得到基于估计位置的dq轴模型,从而求出由轴电流微分.另外通过实际电流信号计算出电流微分.通过两个电流微分的偏差,构成一个闭环观测器,再通过积分计算出位置信号.该估计算法简单,易于实现.实验表明,该算法可以估计出电机速度和位置,能够满足一般伺服系统要求.%In order to implement sensorless control for permanent magnet linear synchronous motor (PMLSM), speed and position of the motor must be estimated without mechanical sensors. In this paper, a novel sensorless position and speed detection algorithm is designed for PMLSM by only measuring terminal voltages and currents. This algorithm is developed from the dq estimating model of the motor, which is Park change from the three-phase voltage model of the motor. Then two q-axis current derivatives are calculated by the estimated model and the measuring current signal respectively. The loop observer is done using the difference between the two current derivatives and the position is obtained by integrating the speed. Further, the algorithm is simple to implement. Experimental results show that the algorithm can estimate speed and position of the motor and its accuracy can satisfy the servo requirement.