An Energy Harvester Using Rolling Magnets with Integrated Rotor and Stator for Wireless Sensor System on a Marine Shaft

In this paper, we introduce a novel energy harvester (EH) using rolling magnets, which can supply power to a wireless sensor system (WSS) for monitoring the status of rotating ship shafts. The EH consists of twelve coils and seven magnets, which generate energy from the shaft's motion and supply it to the WSS for monitoring the shaft system's status. We installed the EH on a 20 cm diameter shaft and obtained a transferred voltage of 0.84 V and an output power of 47.2 mW with 2000 turns of each coil, despite a rotation speed of 25 rpm and a 3 mm air gap. The proposed EH shows great potential for monitoring rotating shaft on ships.