Ultra-low-frequency and high-power Mag-Boost mechanism for ocean wave energy harvesting

Tianyi Tang, Yunfei Li, Manjuan Huang, Mingqi Mei, Zizhao Wang, Fusheng Zha, Lining Sun and Huicong Liu

Renewable and Sustainable Energy Reviews, 2025, vol. 213, issue C

Abstract: Ocean wave energy is a highly promising renewable energy source that plays a significant role in advancing sustainable development. However, the ultra-low-frequency and random characteristics of ocean waves pose significant challenges to efficient and high-power energy harvesting. This paper introduces an innovative Mag-Boost mechanism that ingeniously leverages sudden magnetic-torque variation in orthogonal magnetic fields to convert ultra-low excitation below 1 Hz into high-frequency oscillations exceeding 50 Hz in the power-magnet without direct contact. The energy conversion efficiency can be as high as 89.3 %. By integrating four Mag-Boost units into a circular array, this study presents a high-power wave energy harvester with ultra-low-frequency response capabilities. At a frequency of 1 Hz and an inclination angle of 25°, the harvester achieved a high output performance with a power of 1.79 W and a power density of 1.88 kW/m³, which is an order of magnitude higher than previously reported results. During offshore tests in the Yellow Sea, the wave energy harvester reached a peak open-circuit voltage of 10 V, providing a stable power supply for wireless temperature and humidity sensors. Furthermore, the Mag-Boost mechanism also demonstrates considerable potential for harvesting other forms of low-frequency environmental energy, including wind, vibration, and human kinetic energy.

Keywords: Ocean wave energy harvesting; Mag-Boost mechanism; High power density; Frequency up-conversion; Self-powered sensing (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.rser.2025.115463

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