A Self-Powered Wireless Monitoring System Integrating an Energy Harvester on a Rotating Marine Shaft

This paper presents a self-powered wireless sensor system (WSS) integrated with a simple, compact, high-power energy harvester (EH) for real-time monitoring of rotating shafts in ships. The EH utilizes multiple flexible PCB coils and magnets, achieving a power output of 1.71 W. A comprehensive WSS was designed with four sensors specifically for the rotary shaft. The system's performance was validated on a small-scale test bench with a 200 mm shaft diameter, successfully demonstrating real-time monitoring of the propulsion shaft with the additional function of a charging battery.