Design, modeling and experimental investigation of a magnetically modulated rotational energy harvester for low frequenc
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sign, modeling and experimental investigation of a magnetically modulated rotational energy harvester for low frequency and irregular vibration 1†
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ZHAO LinChuan , ZOU HongXiang , GAO QiuHua , YAN Ge , WU ZhiYuan , 1 2 3 1* LIU FengRui , WEI KeXiang , YANG Bin & ZHANG WenMing 1
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China; Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Hunan Institute of Engineering, Xiangtan 411104, China; National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Shanghai Jiao Tong University, Shanghai 200240, China
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Received March 8, 2020; accepted April 9, 2020; published online May 25, 2020
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. energy harvesting, vibration, low frequency, magnetically modulated route Citation:
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Zhao L C, Zou H X, Gao Q H, et al. Design, modeling and experimental investigation of a magnetically modulated rotational energy harvester for low frequency and irregular vibration. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-020-1595-x
Introduction
The rapid advancement of the wireless sensor network for big data and Internet of things (IoT) is predicted to change every aspect of human’s daily life [1–4]. Traditionally, power sources for these miniaturized and low power consumption electronic devices rely on solid-state chemical batteries. However, there are some inevitable disadvantages of storage batteries, such as the limited battery storage capacity needs a periodic replacement of batteries, and the chemical materials of the batteries are detrimental to the natural environment †These authors contributed equally to this work. *Corresponding author (email: [email protected])
[5–7]. Harvesting the dissipated vibration energy in the ambient environment is considered as a reliable strategy to power such electronic devices and ultimately give rise to the self-power sensing systems, such as automotive applications
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