Three-phase meander-type dynamic wireless power transfer is ideal for the power supply or charging of rail vehicles. However, there is a lack of systematic analysis and design of the three-phase receiver. To achieve the compact design of the three-phase receiver in practical applications, this article studies the compact three-phase receiver with overlapped receiving coils and ferrite core. Based on the analysis of the fundamental coupling characteristic of three-phase meander-type dynamic wireless power transfer, two overlap modes of the receiving coils are concluded and compared. Meanwhile, by considering the influence of mutual inductance harmonic distortion, the accuracy of the receiving coil analysis and design is improved. Furthermore, a practical distributed strip core design is presented to enhance the coupling between transmitting coils and receiving coils. Additionally, the effect of the core on coupling imbalance is analyzed in detail and proves to have little effect on the power transfer. Afterward, a design flow of star-connected series-compensated receiver with the overlapped coils and the distributed strip core is proposed. Finally, for verification, a small prototype with an average output power of 154 W and average efficiency of 97% of the receiving coils is established.

中文翻译：

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曲折型动态无线电力传输系统的紧凑型三相接收器设计

三相曲折式动态无线电力传输是轨道车辆供电或充电的理想选择。但是，目前缺乏对三相接收机的系统分析和设计。为了在实际应用中实现三相接收机的紧凑设计，本文研究了具有重叠接收线圈和铁氧体磁芯的紧凑型三相接收机。在分析三相曲折式动态无线电力传输的基本耦合特性的基础上，总结并比较了两种接收线圈的重叠模式。同时，通过考虑互感谐波失真的影响，提高了接收线圈分析设计的准确性。此外，提出了一种实用的分布式条形磁芯设计，以增强发射线圈和接收线圈之间的耦合。此外，还详细分析了磁芯对耦合不平衡的影响，证明对功率传输的影响很小。随后，提出了具有重叠线圈和分布式条形磁芯的星形连接串联补偿接收器的设计流程。最后，为了验证，建立了一个平均输出功率为154 W，接收线圈平均效率为97%的小型样机。