Simulation analysis of factors affecting transmission efficiency of Maxwell-based MCR-WPT system
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摘要: 运用耦合模理论与等效电路模型，对典型的磁谐振式无线电能传输系统进行理论分析，得到传输效率与谐振线圈间耦合系数的理论关系. 利用Maxwell仿真平台构建闭合线圈模型，并对线圈参数扫描，对谐振线圈进行仿真分析，得到线圈的结构参数(包括线圈匝数、匝间距、内径)以及线圈间空间距离对系统传输效率的影响. 结果表明，增大线圈匝数可有效提升系统传输效率，线圈存在最优匝间距与内径使系统传输效率最大，适当改变线圈间的空间距离会对系统传输效率产生明显影响. 分析结果为后续针对磁谐振式线圈的优化提供了理论依据.Abstract: Coupled mode theory and equivalent circuit model were used to conduct a theoretical analysis of a typical magnetic resonance wireless power transmission system, and the theoretical relationship between transmission efficiency and coupling coefficient between resonant coils was obtained. The Maxwell simulation platform was used to construct a closed coil model, coil's parameter was scanned, and resonant coil was simulated and analyzed, and the influence of the coil's structural parameters (including the number of coil turns, turn spacing, and inner diameter) and the spatial distance between coils on the system transmission efficiency were obtained. The results show that increasing the number of coil turns can effectively improve the system transmission efficiency. The optimal turn spacing and inner diameter of the coil maximize the system transmission efficiency. Appropriate changes in the spatial distance between coils have a significant impact on the system transmission efficiency. The analysis results can provide a theoretical basis for subsequent optimization of magnetic resonance coils.
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图 7 线圈间耦合系数随发射线圈匝数变化
Figure 7. Variation of inter-coil coupling coefficient with numbers of turns of transmitting coil
图 8 线圈间耦合系数随发射线圈匝间距变化
Figure 8. Variation of inter-coil coupling coefficient with turn spacing of transmitting coil
图 9 线圈间耦合系数随发射线圈半径变化
Figure 9. Variation of inter-coil coupling coefficient with radius of transmitting coil
图 10 线圈间耦合系数随接收线圈水平位移变化
Figure 10. Variation of inter-coil coupling coefficient with horizontal displacement of receiving coil
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