Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 63, Issue 10, Pages 2051-2062Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-020-1595-x
Keywords
energy harvesting; vibration; low frequency; magnetically modulated route
Funding
- National Science Fund for Distinguished Young Scholars [11625208]
- National Natural Science Foundation of China [11802091]
- China Postdoctoral Science Foundation [2018M640386]
- Hunan Province Science and Technology Innovation Program [2019RS2044, 2019JJ50099, 2018RS3104]
- State Key Laboratory of Mechanical System and Vibration [MSV202005]
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Vibration energy harvesting is a promising approach for sustainable energy generation from ambience to meet the development of self-powered systems. Here, we propose a novel compact non-resonant magnetically modulated rotational energy harvester (MMR-EH) for low frequency and irregular vibration. Through the rational arrangement of multiple magnetic fields in space, a ring route with low potential energy is established. A movable magnet can be non-contact modulated by the magnetic force to move along the ring route under irregular vibration, which is instrumental in electromechanical energy conversion. A dynamic model of the MMR-EH is developed based on the energy method and verified experimentally. The effects of key parameters on the magnetically modulated route are analysed. The simulation and experimental results demonstrate that the MMR-EH can effectively harvest the energy from ultra-low frequency (3 Hz) and irregular vibration. At a reciprocating vibration frequency of 10 Hz and an amplitude of 20 mm, the harvester can produce an average power of 0.29 mW.
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