A Numerical Study for the Design of a New DD coil Prototype for Dynamic Wireless Charging of Electric Vehicles

The growing demand for more convenient and reliable means to recharge the battery of electric vehicles (EVs) has stimulated scientific efforts toward wireless power transfer (WPT) technology, demonstrating the feasibility of its application through the realization of various prototypes and some products already present on the market. The long-term goal is to dynamically power EVs moving on road. The dynamic wireless charging (DWC) is based on the inductive magnetic coupling between an electrified track on the road and a pickup coil mounted on the EV. In this paper, a new DWC system of coupled coils (named DD coils due to their shape) has been numerically designed and simulated in the perspective of a future prototype. A preliminary analysis of exposure to the stray magnetic fields emitted by the system has been performed by numerical simulations, in order to assess the compliance to the reference level for general public exposure of the European Council Recommendation 1999/519/EC. Results from simulations evidence that the reference level for magnetic field is exceeded at a distance of 30 cm from the DD coils pair. Results from preliminary numerical dosimetry, performed in a homogeneous phantom, show that exposure to the stray magnetic fields emitted by the DD coils pair can also lead to non-compliance with the basic restriction defined by the European Recommendation. Further numerical dosimetry will be carried out on human anatomical models, to assess compliance to the basic restriction. © Institution of Engineering and Technology.All Rights Reserved.