Is the future of EV charging going to go through the vehicle’s tires? Takashi Ohira seems to believe so.
Takashi Ohira, professor at the Department of Electrical and Electronic Information Engineering of the Toyohashi University of Technology led a research group focused on the idea. Their project is called EVER (Electric Vehicle on Electrified Roadway).
The team organized a demonstration during this year’s WTP (Wireless Technology Park), a trade show focused on wireless technologies held earlier this month in Yokohama, Japan. The team’s demo goal was to show how electricity can be transmitted to a pair of tires through concrete.
The block of concrete used was of the same type and same four inches thickness used for highways in Japan; actual-size automotive tires were used. Electricity between 50 and 60 watts was transmitted to the pair of tires and a light bulb was placed where the car’s battery would be to visually show the electricity was actually being transferred.
According to Ohira, the efficiency of power transmission from the metal plate under the concrete to the light bulb attached to the tire is between 80-90 percent.
The team sees this demonstration as an early step and hope to develop the concept further so it can one day recharge vehicles on the move. The next step they need to focus on is increasing the electric power a hundred times, which will help make the technology useful.