Wireless power transmission systems are required for automobiles and automatic guided vehicles (AGVs) to reduce the radiated electromagnetic fields generated from their coils. A conductive case covering the coil effectively suppresses the radiated electromagnetic field, but eddy currents of the case tend to generate heat due to leakage flux. Therefore, herein, the authors propose a technique to arrange a magnetic composite sheet (MCS), in which a magnetic powder and a resin material are mixed. This study describes the effect of applying the MCS to a commercially available coil for AGVs. The coil's impedance characteristics and magnetic-flux density are measured, and the impact of reducing the magnetic-flux density acting on the case with the MCS is confirmed. In addition, the effectiveness of the MCS is clarified by comparing the case's temperature rise and the power transmission efficiency. Moreover, this article describes the efforts to reduce the heat generation effects based on experimental results while maintaining almost the same efficiency.

中文翻译：

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使用磁性复合片在无线电力传输的辐射电磁场抑制外壳中减少热量

汽车和自动导引车 (AGV) 需要无线电力传输系统，以减少其线圈产生的辐射电磁场。覆盖线圈的导电外壳有效地抑制了辐射的电磁场，但外壳的涡流容易由于漏磁通而产生热量。因此，在此，作者提出了一种排列磁性复合片（MCS）的技术，其中混合了磁性粉末和树脂材料。本研究描述了将 MCS 应用于 AGV 的商用线圈的效果。测量了线圈的阻抗特性和磁通密度，并确认了通过 MCS 降低作用在外壳上的磁通密度的影响。此外，通过比较案例来阐明 MCS 的有效性 s 温升和电力传输效率。此外，本文描述了基于实验结果在保持几乎相同效率的同时降低发热影响的努力。