Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 259, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2022.115568
Keywords
Vibration energy harvesting; Electromagnetic induction; Low frequency; Small amplitude excitation; Nonlinear dynamics; Automotive safety
Categories
Funding
- Swedish Foundation for Strategic Research in the program for `Research Institute PhD' [FID16-0055]
- Sweden's Innovation Agency
- Vinnova, grant Challenge-Driven Innovation `Energy Toolkit' [2017-03725]
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This paper introduces a novel concept for efficiently harvesting vibrational energy at low frequencies and small displacements using an electromagnetic energy harvester. Simulation modeling and experimental validation demonstrate the potential performance of this method under harmonic and non-harmonic excitations.
In this paper we present a novel concept to efficiently harvest vibrational energy at low frequencies and very small displacement. We describe and evaluate an electromagnetic energy harvester which generates power from a magnetic circuit with motion induced variations of an air gap. External vibrations induce oscillations of the gap length around an equilibrium point, due to a linear spring counteracting the magnetic force. The relative position of the spring can be adjusted to optimize the harvester output for excitation amplitude and frequency. A simulation model is built in COMSOL and verified by comparison with lab measurements. The simulation model is used to determine the potential performance of the proposed concept under both harmonic and non-harmonic excitation. Under harmonic excitation, we achieve a simulated RMS load power of 26.5 mu W at 22 Hz and 0.028 g acceleration amplitude. From a set of comparable EH we achieve the highest theoretical power metric of 1712.2 mu W/cm(3)/g(2) while maintaining the largest relative bandwidth of 81.8%. Using measured non-harmonic vibration data, with a mean acceleration of 0.039 g, resulted in a mean power of 52 mu W. Moreover, the simplicity and robustness of our design makes it a competitive alternative for use in practical situations.
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