子母弹线圈间耦合对无线传输效率的影响

Effect of Intercoil Coupling on Wireless Transmission Efficiency of Submunitions

摘要:

在子母弹无线能量传输系统中,各个线圈间交叉耦合,使系统传输效率受到影响。通过建立并联谐振无线能量传输系统模型,在子弹线圈组间耦合很小的情况下,分析各个线圈间耦合对系统传输效率的影响,得到在最大传输效率时子弹线圈的频率条件；最后通过实验对推导公式呈现出的子弹线圈频率偏移方向,以及线圈间耦合对系统传输效率的影响进行了验证；结果表明:在对多个子弹线圈进行无线能量传输时,达到最大传输效率时子弹线圈的频率高于初始谐振频率；当子弹线圈与母弹线圈间距较大时,应采用多个母弹线圈对其传输能量；并且减小子弹和母弹线圈间距,可以提高系统最大传输效率。

Abstract:

In the wireless energy transmission system of submunition, each coil is cross-coupled, which affects the transmission efficiency of the system. By establishing a parallel resonant wireless energy transmission system model, the influence of the coupling between bullet coils on the transmission efficiency of the system is analyzed under the condition that the coupling between bullet coils is very small, and the frequency condition of bullet coils is obtained at the maximum transmission efficiency;Finally, the influence of bullet coil frequency offset direction and coil coupling on the transmission efficiency of the system is verified by experiments;The results show that the frequency of bullet coils is higher than the initial resonant frequency when the maximum transmission efficiency is reached. When the distance between the bullet coil and the mother round coil is large, multiple mother round coils should be used to transmit energy to it. And the maximum transmission efficiency of the system can be improved by reducing the coil distance between the bullet and the mother round.