本研究利用液態金屬直寫製程，製作雙層PDMS薄膜包覆之液態金屬線圈，應用於旋轉發電機。線圈在設計階段時，依發電機磁鐵磁場分布規劃線圈直寫路徑，並根據線圈繞組感應電動勢數學模型分析不同匝數的性能差異，以選擇實際使用之匝數。 接著使用有限元素模擬軟體驗證模型，最後透過實際製作線圈之量測結果，確認前面設計流程是否有效。實驗結果顯示當線圈與磁鐵間距為0.494 mm、轉速為3900 rpm時，線圈開路電壓振幅為187 mV，最大輸出功率為75.68 μW，加上倍壓電路後，輸出端開路電壓為1300 mVdc，最大輸出功率為13.31 μW。;In this work, the liquid metal direct writing process is used to construct a dual-layer liquid metal coil which is embedded in the PDMS membrane. This dual-layer coil is used in a rotational energy harvester. During the design phase, the coil writing path was devised based on the magnetic field distribution of the ring magnet of the energy harvester. To choose a proper number of turns, an analysis was carried out and a comparison was made for the performance of the coil winding with different numbers of turns. The analysis was first done by following the mathematic model of the coil’s EMF and output power, then verified by using the finite element simulation software. Eventually, after the actual liquid metal coil was made, the experimental data of the coil was measured and served as proof of whether this coil design method is valid. With the coil at a distance of 0.494 mm with the magnet and a rotational speed of 3900 rpm, the experiment shows that the open-circuit voltage amplitude and maximum output power of the coil are 187 mV and 75.68 μW, respectively. Then the coil is connected with a voltage multiplier with the same operating conditions, the open-circuit voltage amplitude and maximum output power of the voltage multiplier are 1300 mVdc and 13.31 μW, respectively.
