一种基于改进反电动势的模型参考自适应转速辨识方法

A kind of speed identification method of model reference adaptive system based on improved back-EMF

构建了感应电动机的数学模型;在分析基于无功功率的模型参考自适应的稳定性的基础上,提出一种基于改进反电动势的模型参考自适应转速辨识的新方法,即重新构造模型参考自适应转速辨识的误差信号,该信号包括反电动势的误差矢量与转子磁链矢量的叉乘和点乘,通过误差信号辨识出电动机的转子转速。试验结果表明,该方法克服了基于反电动势的模型参考自适应在停车制动及发电状态下的不稳定性问题。

A mathematical model of induction motor was constructed.A new speed identification method of model reference adaptive system based on improved back-EMF was proposed on basis of analysis of stability of the model reference adaptive system based on reactive power.Error signal of speed identification of model reference adaptive system was re-constructed by the method.The error signal was composed of cross and dot product of the back-EMF error vector and the rotor flux vector.The rotor speed of the motor was identified by the error signal.The experimental results show that the new method is effective to solve problem of instability of the model referencing adaptive system under status of motor parking brake and power generation.