This paper presents a quantitative prediction model of conducted electromagnetic emissions (EME) for a variable frequency drive (VFD) motor system based on the macro-modeling approach. This model relies on the effective representations of the frequency dependent characteristics of the parasitic behaviors between converter arms and heatsink, of shielded power cable, and of motor windings. The frequency dependent performances between converter arms and heatsink, and of the motor windings are obtained by processing measurement data. Then the vector fitting method (VFM) with passivity enforcement and circuit synthesis method are adopted to obtain the corresponding equivalent circuits. The equivalent circuit implementation of shielded power cable is achieved by applying a node-to-node admittance functions (NAFs) model, which considers the propagation phenomenon and frequency dependent losses accurately. The conducted EME model is compatible with commonly used transient circuit solvers since it only includes constant circuit elements. The conducted emissions of the VFD system are then evaluated by analyzing the common mode (CM) and differential mode (DM) voltages and currents.

中文翻译：

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将频率相关性纳入 VFD 电机系统传导电磁辐射的预测模型

本文提出了一种基于宏观建模方法的变频驱动 (VFD) 电机系统传导电磁辐射 (EME) 的定量预测模型。该模型依赖于转换器臂和散热器、屏蔽电力电缆和电机绕组之间寄生行为的频率相关特性的有效表示。转换器臂和散热器之间以及电机绕组之间的频率相关性能是通过处理测量数据获得的。然后采用具有无源强制的矢量拟合法（VFM）和电路合成法得到相应的等效电路。屏蔽电力电缆的等效电路实现是通过应用节点到节点导纳函数 (NAF) 模型来实现的，它准确地考虑了传播现象和频率相关的损耗。传导 EME 模型与常用的瞬态电路求解器兼容，因为它仅包含恒定电路元件。然后通过分析共模 (CM) 和差模 (DM) 电压和电流来评估 VFD 系统的传导发射。