永磁同步电动机定子磁链观测方法研究

定子磁链的准确观测是直接转矩控制系统的重要环节之一.定子磁链的观测,一方面影响着空间电压矢量的选择,即可能由于观测误差无法准确判定磁链所在的扇区;另一方面它可能造成控制策略失误,影响转矩的观测结果,所以定子磁链的准确观测和有效控制,对于提高直接转矩控制系统的性能有着重要的意义.将磁链反电势积分法和电流模型观测方法联合起来,构成一适用于全速范围内的闭环磁链观测器,从而有效确保了定子磁链的准确观测.

Research of Stator Flux Observer of Permanent Magnet Synchronous Machines

The accurate observer of stator flux is one of the most important sector of direct torque control system.The observer of stator flux has effect on the selection of space voltage vector,which means the sector cannot be judged precisely when there exist error in flux observer,on the other hand,the error could cause control strategy misplay.So the accurate observer and effective control of flux have significant sense to the performance improvement of direct torque control system.Based on the mixed model of back EMF integral and current model,a new closed loop stator flux observer was put forward,which has simple structure and easy to be realized during full speed range.