一种在线辨识定子电阻的MRAS转速估算方法

摘要

针对传统模型参考自适应法估算电机转速时存在的缺陷,提出了一种改进型估算模型,可有效消除纯积分环节带来的直流漂移和初始值问题. 在此基础上,分析了定子电阻变化对转速估算的影响,并对定子电阻做了在线辨识,实时更新转速估算系统中随电机温升而变化的定子电阻值,以保证转速估算的精确度. 仿真和试验表明了该方法的合理性和有效性.%According to the drawbacks of traditional model reference adaptive system ( MRAS ) , an improved estimation model was presented, which could effectively eliminate the DC drift and the initial value problems caused by pure Integrator. On this basis, the influence of variable stator resistance on the speed estimation was analyzed and the stator resistance online identification was made in order to update stator resistance changed by temperature in real time and ensure the accuracy of speed estimation. The simulation and experimental results showed the rationality and effectiveness of the method.