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MMM 2022

November 07, 2022

Minneapolis, United States

Extremely Low Frequency Multi Directional Electromagnetic Wave Energy Harvester Based on Special Double Pendulum Structure

In the marine environment, energy supply for distributed sensors is one of the main difficulties facing Internet of Things technology. Up to now, a variety of energy harvesters have been created to convert wave kinetic energy into electrical energy through electromagnetic induction, piezoelectric effects and other principles. At present, although some wave energy harvesters can collect wave energy and provide power for some low-power products, the overall output response frequency is greater than 1Hz1, which is higher than the most common wave frequency of 0.25Hz-1.0Hz. Some experts with extensive achievements in energy harvesters are committed to the research of low-frequency and broadband, however, the output voltage of the designed wave energy harvester is too small2, meantime the overall structure is extremely complex3. In addition, scholars have not explored the multidirectional energy harvesting enough, and the existing studies are mostly based on the spherical friction structure4, but spherical shapes can lead to lower energy density or material utilization. In this paper, an electromagnetic wave energy harvester with a special double pendulum structure (as shown in Fig.1) has been proposed, the energy harvester can also capture vibrational energy in multiple directions, responding to minimum frequencies of less than 0.25Hz and to currents with velocities of approximately 0.4m/s. This energy harvester can charge a 220μF capacitor to about 32V in 50s with a peak power of 120mW under vibration conditions with a vertical height of 50 cm and a frequency of 1.0Hz, and can charge the capacitor to about 16V in 50s at a horizontal speed of 0.72m/s (as shown in Fig.2). The results show that the wave energy harvester designed in this paper can respond to multi-directional vibrations, and the response frequency is lower and wider, which is more favorable for wave energy harvesting.


1 H. Liang, G. Hao and O. Z. Olszewski, International Journal of Mechanical Sciences., Vol. 219, 107130 (2022)
2 M. Li, X. Jing, Energy Conversion and Management., Vol. 244, 114466 (2021)
3 Z. Li, X. Jiang and P. Yin, Applied Energy., Vol. 302, 117569 (2021)
4 Q. Gao, Y. Xu and X. Yu, ACS Nano., Vol. 16, p.6781-6788 (2022)

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