一种新型永磁同步电机定子磁链观测器

定子磁链估计是直接转矩控制中不可缺少的部分，传统直接转矩控制中通过对反电动势值进行积分估计定子磁链.为了避免纯积分法的缺陷，提出定子磁链估计的改进方法，将扩展卡尔曼滤波引入到直接转矩控制中，利用扩展卡尔曼滤波估计定子磁链，研究了扩展卡尔曼滤波在定子磁链估计中的应用.仿真结果表明所提出的算法克服了传统反电动势积分法的缺陷，不仅能准确估计速度、转子位置和定子磁链，并且对电机参数具有很强的鲁棒性.

A Novel Stator Flux Linkage Observer of Permanent Magnet Synchronous Motor

Stator flux estimation is an indispensable part of direct torque control. In order to avoid the integration of the back emf， several improved methods of stator flux estimation were proposed. Several types of state observers have been considered， especially the extended Kalman filter(EKF) has been received more and more attention. The EKF was used to estimate stator flux linkage， and the simulation results indicated that the proposed method not only does well in speed， rotor position and stator flux linkage estimation， but also is robust to motor parameters.