Generation method of ac ampere force using eddy current inside a non-magnetic thin plate and it's effect on electro dynamic suspension

In this paper, we propose a novel method for magnetic levitation force generation. In our method, we utilized three AC electromagnets that generate the inductive and AC Ampere forces. One electromagnet is installed above the surface and the other two in the both sides of a thin plate. Phase conditions providing the maximum levitation force are derived from 2-dimentional finite element analysis. In order to confirm the performance of the proposed method, we performed some experiments. The experimental results show that in difference from conventional AC methods, the magnetic levitation force is increased around 5.9 times for the same eddy current inside the aluminum plate. In addition, the relations between excitation frequency, plate thickness and total levitation force are explained in details.