An Energy Harvester for a Battery-Free Wireless Sensor System on a Marine Propulsion Shaft

In this work, we present an energy harvester (EH) for a battery-free wireless sensor system (WSS) on a marine propulsion shaft. To produce power for driving the WSS on a low-speed propulsion shaft, an EH with multiple coils and magnets is proposed. Using eight coils with 3,000 winding turns and six 1.43 T magnets, the EH produces a power of 1.5 W at 200 rpm. The proposed EH demonstrates that it is possible to implement a battery-free WSS for real-time monitoring of a marine propulsion shaft. As far as we know, the proposed EH shows the highest power compared to other systems.