A novel means of optimizing transfer efficiency of Inductively Coupled wireless power transfer (WPT) system is presented for the first time. In the applications envisaged, such as electric vehicles and biomedical implants, generally the receiving coil is laterally and angularly misaligned from the transmitting coil. The numerical solution of mutual inductance between the two coils is derived and simulation result shows there is a partial optimal solution in the ranges of lateral and angular misalignments. The bigger is mutual inductance, the higher transfer efficiency is. The novel means presented in this study allows the coil to be removable and rotatable for achieving bigger mutual inductance and optimizing transfer efficiency. Finally the experimental results show the means is efficient and greatly improves the transfer efficiency. If the transfer distance is 15 cm and there is no lateral misalignment, the transfer efficiency can be improved about from 38.6% to 60.5% by turning the transmitting coil to make the tilt angle varied from 0 to π/4. This introduced technique can be widely applied to WPT system to optimize the transfer efficiency.
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