Shaier Ahmed A, Mohamed Ahmed A S, Metwally Hamid, Selem Sameh I
Electrical Power and Machines Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt.
Eaton Research Labs, Eaton Corporate, Golden, CO, USA.
Sci Rep. 2023 Oct 19;13(1):17838. doi: 10.1038/s41598-023-44949-z.
The magnetic coupler is the most vital component for charging EV wirelessly. Through it, the output power can be transported from the transmitter to the receiver by means of electromagnetic fields. Therefore, this manuscript presents a proposed design of a magnetic coupler in the form of Double-D (DD) on both sides, which is suitable for in-motion inductive charging. This charger is capable of transferring power of 200-kW through an airgap of 250 mm with an efficiency of 91.88% and an operating frequency of 85 kHz. Computational modeling is conducted to obtain the magnetic coupler and the compensation parameters of the proposed system. The appropriate dimensions of the coils, magnetic and metallic shielding are obtained by using the finite element model (FEM). The effect of misalignments on the self and mutual inductances of the two coils (L, L, M), the output power (P), and the transmission efficiency (η) is studied in case of one and two coils at transmitter side. The output power in the distance between the two transmitter coils (d) is improved by controlling the operating frequency, adding magnetizable concrete (MC), or both together. These techniques have proven effectiveness in improving the output power by 45.15% for small d and 72.51% for large d. In addition, the efficiency improved by 15.95% for small d and 60.76% for large d. Moreover, these improvement cases were compared in terms of size, weight and cost for a 100-m driving track.
磁耦合器是电动汽车无线充电的最重要部件。通过它，输出功率可以借助电磁场从发射器传输到接收器。因此，本文提出了一种双侧双D（DD）形式的磁耦合器设计方案，适用于动态感应充电。该充电器能够通过250毫米的气隙传输200千瓦的功率，效率为91.88%，工作频率为85千赫。进行了计算建模以获得所提出系统的磁耦合器和补偿参数。通过使用有限元模型（FEM）获得了线圈、磁性和金属屏蔽的合适尺寸。研究了发射器侧单线圈和双线圈情况下失准对两个线圈的自感和互感（L、L、M）、输出功率（P）和传输效率（η）的影响。通过控制工作频率、添加可磁化混凝土（MC）或两者同时使用，提高了两个发射器线圈之间距离（d）处的输出功率。这些技术已被证明在小d时可将输出功率提高45.15%，大d时提高72.51%。此外，小d时效率提高了15.95%，大d时提高了60.76%。此外，还针对100米的行驶轨迹，在尺寸、重量和成本方面对这些改进案例进行了比较。
