| dc.description.abstract | 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. | en_US |