Increasing the resonant frequency can effectively improve the transmission efficiency of magnetically coupled resonant wireless power transmission( MCRWPT) system
but it will make the transmission efficiency vulnerable to the change of coil position.Factors affecting the transmission efficiency of the MCRWPT system operating at a fixed moderate resonant frequency are studied.The circuit model for four-coil MCRWPT system is established
and the relationship between transmission efficiency and transmission distance
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energy emission receiving coil is deduced.The genetic algorithm is introduced to optimize the transmission efficiency.The influence of the factors is analyzed in detail.The ideas of improving the transmission efficiency of the MCRWPT system are given and validated by simulations.