Development of a novel spindle‐shaped coil‐based wireless power transfer system for frequency splitting elimination.

Summary: To eliminate frequency splitting in wireless power transfer, a novel spindle‐shaped coil‐based wireless power transfer system is introduced and designed. Based on the equivalent circuit model, the transmission coefficient and the input impedance are calculated. A comparative analysis is performed between the traditional and the proposed systems. It is found that the frequency splitting is suppressed by utilizing spindle‐shaped transmitting and receiving coils in the proposed system because of the larger mutual inductance between the source coil (load coil) and transmitting coil (receiving coil) and the smaller mutual inductance between the transmitting and the receiving coils in comparison with the traditional system. In the overcoupled region, the transmission coefficient of the proposed system almost remains unchanged and keeps at a high value. The input impedance is characterized with high amplitude and small argument, which is beneficial for efficient power transfer. Experimental setup is established to validate the performance of the proposed wireless power transfer system. The results indicate that the proposed system is superior to the traditional one in eliminating the frequency splitting, which is well consistent with the simulation analysis. [ABSTRACT FROM AUTHOR]