Parameter Effects on Induction Coil Transmitter of Wireless Charging System for Small Electric Motorcycle

As the electric motorcycles are widely used, thus the charging system is important to be more convenient due to short driving range. Normally, there are two types of charging systems as conductive and wireless power transfer systems. Since the short driving range problem for electric motorcycle, thus wireless power transfer is necessary to study for increase of driving range with convenient charging application. In this study, 25 kHz of induction cooker was applied as transmitter part. The receiving part was designed for charging small electric motorcycle battery with maximum voltage of 60V and maximum current of 10A. As the receiving part, the design of receiving coil was studied with effect of parameters which were consisted of wire diameter, radius of receiving coil, number of turns, and number of wire per core. The results showed that decreasing of receiving coil radius brought about lower induction voltage due to characteristics of magnetic field in transmitter. The greater diameter of copper wire, the lower loss was observed in charging system. Moreover, increase of the turn and wire per core, the system power induced higher. It was concluded that the maximum magnetic field covered on investigated induction cooker at 7 cm of receiving coil radius,1 mm of copper wire diameter. Charging the electric motorcycle battery of 60V 10A with 5 turns of coil and 3 wires per core gave sufficient power to charge the battery.