Homogenization Approaches for Laminated Magnetic Cores using the Example of Transient 3D Transformer Modeling H.Neubert *1, J. Ziske 1, T. Heimpold 1,and R. Disselnkötter 2 1Technische Universität Dresden, Germany, Institute of Electromechanical and Electronic Design, 2ABB AG, Corporate Research Center Germany, Ladenburg, Germany *Corresponding author: D-01062 Dresden, Germany,
[email protected] Abstract: A specific issue in transformer of only one turn and is short-circuited on the modeling using the finite element method is the secondary side. consideration of electric sheets or other A specific issue in transformer modeling is laminated core materials which are used to the consideration of magnetic cores based on reduce eddy currents. It would be impractical to stacked electric sheets or strip wound or other explicitly model a large number of sheets as this laminated core materials which are used to would lead to a large number of elements and reduce eddy currents and thus to minimize the hence to unacceptable computational costs. dynamic hysteresis losses and to improve the Homogenization procedures overcome this dynamic behavior of magnetic actuators. problem. They substitute the laminated structure Normally, the thickness of the individual by a solid having nearly the same electromagne- sheets is small as compared to the core thickness. tical behavior. In our study, we have Therefore, it would be impractical to explicitly implemented several of them in a transformer model a large number of sheets with a high model using COMSOL Multiphysics. Simulation dimensional aspect ratio, as this would lead to a results obtained with the different homogeni- large number of elements and hence to zation approaches are compared to experimental unacceptably high computational costs.