Abstract
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.
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