Virtual Impedance Control for Efficient Power Transfer in Electromagnetic Levitation Melting System

In contactless electromagnetic levitation technology, one of the main challenges is that the amount of power delivered to the load depends significantly on parameters of the transformer and therefore is very sensitive to system impedance variations. In this paper, a systematic design procedure based on virtual impedance control strategy is proposed to obtain high transfer efficiency and achieve maximum power transfer. A contactless electromagnetic levitation melting system was used to validate the proposed method. Both theoretical analysis and simulation results indicate the effectiveness of the proposed structure.