Abstract
A new method of contactless energy transmission to moving loads such as electric vehicles (EVs) is proposed. Employing rectangular and spiral coils for the primary and secondary windings in our cordless power station (CLPS), we transmitted over 200 W of energy to an EV motor. The rectangular coil was used for stable transmission in the event of coil misalignment, and the spiral coil for efficient reception of flux from the primary coils. By placing many rectangular coils with their longer sides aligned with the EVs direction of motion, we caused that the energy transmitted was more or less stable with respect to displacement of the EV. A switched excitation system that we added to the primary coils enhanced the total transmission efficiency. A noteworthy feature of the system is that it is controlled by human intention. Only one coil is excited, to the one nearest to the load, to improve the overall efficiency.
