Under the skin: How roads could charge your electric car as you drive

Source: Jesse Crosse· AUTOCAR · | February 21, 2022

Stellantis-backed Arena of the Future is powered by 1MW of electricity to charge vehicles on the move

Source: Autocar

The prospect of charging a car, or any electric vehicle, while it’s driven along the road is an appealing one and something that has been the subject of continual research and development throughout the world for well over a decade.

One of the latest projects is the Arena del Futuro, a 1050m-long oval test circuit built by Stellantis and partners near the A35 between Brescia to Milan in Italy, to develop ‘dynamic wireless power transfer’ (DWPT) or, to put it another way, EV charging on the move.

Being able to wirelessly charge a vehicle on motorways while driving it would have a major impact on EV design and prospects for haulage trucks, which currently would need unfeasibly large batteries to achieve the distances they need to cover. However, cars and trucks could have much smaller batteries if they relied on static charging locally, with longer range achievable on trunk routes through the use of DWPT. Trials started this year with a Fiat 500 electric and Iveco E-Way bus equipped with DWPT receivers.

Inductive charging of EVs has been around as long as the modern EV and trialled in real-world conditions as far back as the early noughties. In its basic form, the principle is exactly the same as it is for wireless phone or toothbrush charging, or for generating a spark in a petrol engine ignition system.

‘Wireless power transfer’ takes a number of different forms but is based on the phenomenon that if a wire is placed in a magnetic field, and then the magnetic field is removed, a voltage is induced (generated) in the wire. Scaled up, with coiled wire and powerful electromagnetic fields, the electrical power generated can be big enough to charge an EV.