Reducing Coil Characteristics Deterioration by Using Insulated Rebar Testbody in Dynamic Wireless Power Transfer

In dynamic wireless power transfer (DWPT), it is essential to embed the power transmission coils in the road. Previous studies have reported that the properties deteriorate during embedment in reinforced concrete pavements because of rebar and concrete. In this paper, a reinforced concrete testbody was used to simulate the embedment of the coils in the pavement and to measure the properties of the coils because of the embedment. We propose a method to reduce the deterioration of properties by changing the rebar used in the testbody to be insulated rebar. As a result of measurements with a vector network analyzer (VNA), the use of insulated rebar reduced the Q-value of the coil by about 30 % compared to that of normal rebar. Furthermore, a transmission efficiency of 93.2 % was obtained at an air gap of 170 mm.