线圈偏移角度对无线电能传输特性的影响

摘要

根据两线圈磁耦合谐振式无线电能传输模型,推导了磁耦合谐振式无线电能传输效率与线圈偏移角度、传输距离之间的关系公式,研究了传输距离和偏移角度对传输效率的影响,得出了如下结论:随着传输距离的增大,偏移角度对无线电能传输效率的影响越来越小;偏移角度较小时,其对传输效率的影响不大;偏移角度大于75°时,随着偏移角度的增大,传输效率急剧下降;随着传输距离的增大,无线电能传输效率下降趋势越来越平缓.Matlab仿真和实验验证了理论分析的正确性.%Formulas of relation between magnetic coupling resonant wireless power transmission efficiency and offset angle of coil and transmission distance were derived according to magnetic coupled resonant wireless power transmission model with two coils.Effect of transmission distance and offset angle on transmission efficiency were studied,and conclusions were obtained as follows:as transmission distance increases,impact of offset angle on wireless transmission efficiency becomes smaller and smaller;When offset angle is small,its effect on transmission efficiency is not significant;when offset angle is greater than 75°,the transmission efficiency decreases sharply with increase of offset angle;as the transmission distance increases,decreasing trend of wireless power transmission efficiency is more and more gentle.Correctness of theoretical analysis was verified by Matlab simulation and experiment.