一种永磁同步电机宽速域无传感器系统的控制策略

设计了一种改进型滑模观测器(SMO)实现永磁同步电机(PMSM)无传感器宽速域控制。使用反电动势观测器替代低通滤波器,避免了转子位置信息滞后的问题。在定子电流计算中引入随转速自适应调节反馈系数的反电动势反馈,减小了系统抖振,使宽速域下转子转速和位置估计更加精确。采用锁相环技术(PLL)来抑制高频信息,提取出准确的转子位置。基于d SPACE搭建了PMSM的快速控制原型试验平台,对无传感器控制系统进行了稳态和动态试验,结果验证了该算法的有效性。

A Control Strategy for Permanent Magnet Synchronous Motor WideSpeed Range Sensorless System

An improved sliding mode observer (SMO) was designed to realize sensorless control in wide speed range of permanent magnet synchronous motor (PMSM). A back electromotive force (EMF) observer was used to replace the low pass filter, which avoided the problem of the rotor position information lag. Meanwhile, the feedback value of back EMF were introduced into the calculation of stator current and feedback coefficient according to the variation of rotating speed of the rotor was adaptively adjusted, which reduced the chattering of the system. Thus the rotor position and speed estimation was more accurate in wide speed range. The phase locked loop (PLL) technique was used to suppress the high frequency information to extract the accurate rotor position. Based on the dSPACE rapid control prototype experimental platform, the sensorless control system of static and dynamic experiments were carried out. The results verified the validity of the proposed method.