Verification of Electrical Characteristics by Coils Embedded in Asphalt Pavement and 100,000 Wheel Traveling Test of a Heavy-Duty Vehicle in Dynamic Wireless Power Transfer

In dynamic wireless power transfer, the transmitter coils are embedded in the road pavement. The coils must have both electrical characteristics that can supply sufficient power for electric vehicles to run and mechanical strength equal to or greater than that of ordinary road pavement. In this paper, coils were embedded with MMA resin mixture in two different locations on a circular pavement running test site, one at the wheel-to-wheel location assuming operation on an actual road and the other below the wheel running location to compare durability, and the durability and electrical characteristics of the pavement were evaluated before and after a 100,000 wheels (5t wheel load equivalent) running test by a large vehicle. As a result, there was no damage to the pavement or the coils themselves after the driving test, and all coils achieved an output power of 46 kW or more and a transmission efficiency of 81% or more when the input voltage was converted to 600 V using VNA for electrical characteristics. This indicates that the coil mounting method using MMA resin mixture is suitable in terms of both mechanical strength and electrical characteristics.