基于最优发射半径的锥形线圈WPT系统优化

Optimization of Tapered Coil Wireless Power Transfer System Based on Optimal Transmitter Radius

在无线电能传输系统中盘式发射线圈存在一个使传输功率最大的最优半径值,并且传输距离的改变也会造成发射线圈最优半径值的变化。针对这一问题,提出了量化发射线圈最优半径与传输距离关系的方法,继而指导发射线圈的优化设计。首先从系统空间磁场的分析上,证明了最优发射半径的存在性,然后探究并拟合出最优发射半径与传输距离之间的表达式,设计了每匝线圈半径均为最优值的锥形螺旋发射线圈。最后经有限元仿真验证,优化的锥形线圈系统较传统的柱形线圈系统互感提升了140.16%,周围环境的漏磁更少,证明了优化的锥形螺旋线圈的优越性。

In the wireless power transfer system,there is an optimal radius value for the disc transmitter coil to maximize the transmission power,and the change of the transmission distance will also cause the change of the optimal radius value of the transmitter coil.To solve this problem,a method to quantify the relationship between the optimal radius of the transmitter coil and the transmission distance was proposed,and then the optimization design of the transmitter coil was guided.First,from the analysis of the system space magnetic field,the existence of the optimal transmitter radius was proved,and then the expression between the optimal transmitter radius and the transmission distance was explored and fitted,and the tapered spiral transmitter coil with the optimal coil radius of each turn was designed.Finally,it was verified by finite element simulation that the optimized tapered coil system increase the mutual inductance by 140.16%compared with the traditional cylindrical coil system,and the surrounding environment has less magnetic leakage,which prove the superiority of the optimized tapered spiral coil.