Litz copper wire (LCW) coils are used in wireless power-transmission systems in electric vehicles, which require minimal low loss and weight to reduce heat generation and improve fuel economy. In this study, we investigated magnetic tapes for low-loss and lightweight Litz aluminum wire (LAW) coils. The direct current resistance of the aluminum coil was higher than that of the copper coil; however, at 84 kHz, the alternative-current resistance was suppressed by the magnetic tape, and the weight of the LAW coil with a magnetic tape, which could reduce the resistance, was smaller than that of the LCW coil. The effectiveness of the magnetic tape in temperature reduction was clarified by the power-transmission experiment at 84 kHz. The transmission efficiency of the LAW coil with magnetic tape was improved and the temperature rise was reduced compared to the LCW coil.

中文翻译：

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使用磁带实现汽车无线电力传输的利兹铝线线圈的低损耗


利兹铜线 (LCW) 线圈用于电动汽车的无线输电系统，该系统需要极低的损耗和重量，以减少热量产生并提高燃油经济性。在这项研究中，我们研究了用于低损耗、轻质利兹铝线 (LAW) 线圈的磁带。铝线圈的直流电阻高于铜线圈；然而，在84 kHz时，交流电阻被磁带抑制，并且带有磁带的LAW线圈的重量比LCW线圈更小，可以减少电阻。 84 kHz 的电力传输实验阐明了磁带在降低温度方面的有效性。与LCW线圈相比，带有磁带的LAW线圈的传输效率得到了提高并且温升降低了。