Battery-Free and Real-Time Wireless Sensor System on Marine Propulsion Shaft Using a Wireless Power Transfer Module
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Updated: Aug 13, 2025

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
Published on: October 20, 2021
Young Chul Lee1, Van Ai Hoang1
1Department of Marine Electronic, Communication and Computer Engineering, Mokpo National Maritime University, Mokpo 58628, Republic of Korea.
Abstract:
In this paper, we present a wireless sensor system (WSS) that integrated an inductive wireless power transfer (I-WPT) module for battery-free real-time monitoring of the status of rotating shaft in ships. Firstly, an optimized I-WPT module for seamless power supply was implemented using multiple Tx and Rx coils, and its power capability of 1.75 W with an efficiency of 75% was achieved. Secondly, as a result of the high-power transfer performance of the implemented I-WPT module, an entire WSS that integrated four sensors was designed on the rotary shaft. Finally, the designed WSS was installed on a small-scale test bench system with a shaft diameter of 200 mm; it was demonstrated that the status of a propulsion shaft could be monitored in real time without a battery.
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