Efficiency and Magnetic Flux Comparison of Circular and DD Pads with Misalignment

The strong increase of road vehicles electrification represents a milestone in the energy transition process that is necessary to face the climate change. However, full electrification is hard to reach due to range anxiety and the electric vehicles charging time. Stationary and dynamic wireless charging methods can provide a solution to these problems. Among wireless power transfer technologies, resonant inductive power transfer is the most widely used technology in the field of electric vehicles. After a brief analysis of the operation of this technology, the paper proposes a study of resonant inductive power transfer systems using a method that integrates finite element method and circuit analysis. The work analyses wireless power transfer systems based on circular and DD pads, highlighting the impact of the displacement between transmitter and receiver on the power transmission. Both the pairs of pads are effective in transferring 7.7 kW. The DD pads show a greater magnetic coupling, but also a higher leakage flux.