About the heating of foreign metallic objects in magnetic field of wireless power transfer by cars

Abstract:
Inductive power transfer is an upcoming technology also in the e-mobility. In many cases a gap clearance between car and parking ground can be supposed and in this gap an alternating magnetic field has to be induced for the energy transport. Often a car will be charged in public and the people around don't have special knowledge about the basic physics. Furthermore it is a probably scenario that foreign metallic objects may be thrown into the gap or they have been transported by the wind. It is known that metallic objects in alternating magnetic fields can become very hot. So this becomes a question of security. In this work a theoretical approach and a simulation of different metallic objects is done following the question which form will be heated up more or less. Next a measurement of the heating of metallic foil in a practical setup for charging cars inductive is presented.