共轴非平行非对称线圈结构对MCR-WPT效率的影响

Effect of asymmetric coils with non-parallel coaxial on the transfer efficiency of MCR-WPT

磁耦合谐振式无线电能传输是一种全新的电能传输方式,为工业、生活及医疗等领域带来了极大便利。但传统的对称线圈结构已制约了无线输电技术在矿井、医疗等具有特殊需求领域的应用。综合前人提出的共轴非平行结构及非对称线圈结构的无线输电系统,分析了两共轴非平行线圈传输距离半径比、线圈半径比与偏移角对无线电能传输效率的影响,并分析了各因素对效率的相互影响。仿真结果显示传输距离半径比越大效率保持基本不变的偏移角度范围越小,偏移角对传输效率的影响越平缓。随传输距离半径比的增加效率先增加后逐渐降低,偏移角度在80°附近时,传输距离半径比对效率的影响最大。线圈半径比对传输效率的影响与偏移角度、传输距离等有关。试验验证了该理论分析的正确性,为研究复杂环境下的无线电能传输提供了理论基础,也为进一步开发无线电能传输系统提供了参考。

As a new power transfer mode,wireless power transfer（ WPT） via coupled magnetic resonances brings great convenience to the industrial,medical and life field.However,the traditional symmetrical coil structure has limited the applications of WPT technology in the fields with special needs,such as the field of the mine and medical. Based on the WPT system with asymmetric coil structure proposed by predecessors,the paper analyzed the effect of the ratio of transfer distance to radius,the ratio of the radius of the two coils and angular misalignment of the non-parallel coaxial coils on the transfer efficiency of WPT via coupled magnetic resonance and the mutual effect on efficiency among each factors.Simulation results shows that,the larger the ratio of the transfer distance to radius is,the smaller the range of the angular misalignment will be.And the effect of angular misalignment on the transfer efficiency is more gentle.With the increase of the ratio of transfer distance to radius,the efficiency increases first and then decreases,and when the angular misalignment is around 80°,the effect is the greatest.And the effect of the ratio of the radius of the two coils ontransfer efficiency is related to the angular misalignment and transfer distance. The experiment results show that the theoretical analysis of the paper is correct,which providing an useful theoretical reference for the design and further research on the WPT system in complicated environment.