Aiming at the problem that the frequency splitting problem occurs when the transmission distance rea -ches a certain value , the coupling factor exceeds the critical value of small magnetic coupling resonance wireless power transmission .Based on the mutual inductance coupling theory and the equivalent circuit model , the expres-sion of the relationship between the load voltage , transmission efficiency and coupling factor , loss of harmonic factor is derived , and the frequency characteristics are analyzed by mutual inductance coupling theory and the equivalent circuit model .In order to improve the frequency splitting of the load voltage in the system , the method of lateral movement of the receiving side coil was used under the condition of keeping the axial distance of the system .Final-ly, the small power magnetic coupling resonant wireless power transmission experiment platform was built .The ex-perimental results show that by lateral movement of the receiving side coil can effectively improve the frequency splitting problem , thus it provides effective reference for the application of wireless power transmission in reality .%针对在磁耦合谐振式无线电能传输过程中当传输距离到达一定值后，耦合因数超过临界耦合值而出现的频率分裂问题。利用互感耦合理论和等效电路模型对系统进行建模分析，得出负载电压和传输效率与耦合因数、失谐因子的关系表达式，并对其频率特性进行分析。为了改善系统在过耦合状态出现的负载电压频率分裂问题，采用了在保持其轴向距离不变的前提下，横向移动接收侧线圈的方式。进行了小功率磁耦合谐振式无线电能传输实验，结果表明通过横向移动接收侧线圈，可以有效改善频率分裂的问题，为无线电能传输在现实中应用提供了有效参考。
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