场线路多耦合下电机及其驱动系统辐射电磁干扰预测方法研究

摘要

本文研究了场线路多耦合下电机及其驱动系统辐射电磁干扰预测方法.共模干扰回路是系统产生电磁辐射的主要来源,分析了系统共模干扰源的产生机理和传导路径.建立了共模干扰传导路径中主要部件的模型,即交流感应电机等效电路模型及驱动系统输入输出屏蔽电缆线束模型等,将各部分电路模型按照实际连接情况进行组合,获得了系统辐射电磁干扰预测模型.提出了利用CST MWS和CST CS对预测模型联合仿真的分析方法,并通过实验验证了预测模型的正确性.%This paper proposed an efficient approach for predicting electromagnetic interference emission of motor and its drive system under field-circuit and transmission line(TL) coupling.As the common mode interference circuit is the main source of electromagnetic emission,its propagation path is analyzed.On this basis,the key components'models in common mode interference conduction path are established,such as AC induction motor's equivalent circuit modell,drive system's inputs' and outputs'harness model of shielded cable and so on.Then,each part circuit model is connected according to the system's actual combination and the system's EMI prediction model is obtained.Finally,CST MWS and CST CS studio joint simulation method is used to analyze the proposed prediction model and the results are in good agreement with experiment measurement,which validate the accuracy of our proposed approach.