%0 Journal Article
%T Application of composite materials in inductive charging systems for electric vehicles
%A Florian Niedermeier
%A Marius Hassler
%A Tobias Mayr
%J Journal of Composite Materials
%@ 1530-793X
%D 2019
%R 10.1177/0021998318824637
%X Inductive charging is a popular possibility to enhance the acceptance toward electric vehicles. It requires a charging unit, consisting of a copper coil and a ferrite layer, integrated in the vehicle underbody for power transfer. Here different requirements like the mechanical protection or temperature distribution occur. Therefore, a sophisticated material concept for the housing of the coil and ferrite has to be applied. One possibility is the use of carbon fiber reinforced plastic, as the material properties promise high stiffness and thermal conductivity. Critical is the energy absorption of the material in the electromagnetic field of the inductive charging unit due to its electrical conductivity. We propose the use of isolating layers of glass fiber between the layers of the carbon fiber reinforced plastic to reduce eddy currents. In this study the electromagnetic behavior of composites that consist of a combination of electrical conductive and electrical nonconductive materials is investigated. Therefore, the electromagnetic field of the charging unit is simulated in a first step. Then, an analytical and numerical model of the composite material is validated by measurements in the homogeneous electromagnetic field of a Helmholtz coil. Finally, the models are applied to investigate the material behavior in the heterogeneous field of the inductive charging unit. The results show that a different amount of power is absorbed depending on the fiber orientation of the carbon fiber reinforced plastic and the number of isolating layers. Most suitable for the usage in the inductive charging unit are carbon fiber reinforced plastic layers that are all isolated against each other by layers of glass and have a fiber orientation of 45กใ in relation to the ferrite edges
%K Inductive power transfer
%K multifunctional
%K composites
%K carbon fiber reinforced plastic
%K power absorption
%U https://journals.sagepub.com/doi/full/10.1177/0021998318824637