The common-mode impedance over a wide frequency range is of high interest for the analysis of parasitic phenomena occurring with inverter-fed machines. Here, a method is presented to model the common-mode impedance of electrical machines by a transmission-line model. The parameters are determined by finite-element calculations and by a combined analytic finite-element approach. The results illustrate the significant influence of the current return path through the laminated stator core back stack as well as the role of the winding overhang.
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