Design and optimization of a bi-axial vibration-driven electromagnetic generator
- 17 September 2014
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 116 (11), 114506
- https://doi.org/10.1063/1.4895994
Abstract
To scavenge energy from ambient vibrations with arbitrary in-plane motion directions and over a wide frequency range, a novel electromagnetic vibration energy harvester is designed and optimized. In the harvester, a circular cross-section elastic rod, not a traditional thin cantilever beam, is used to extract ambient vibration energy because of its capability to collect vibration from arbitrary in-plane motion directions. The magnetic interaction between magnets and the iron core contributes to a nonlinear oscillation of the rod with increased frequency bandwidth. The influences of the structure configurations on the electrical output and the working bandwidth of the harvester are investigated using Ansoft's Maxwell 3D to achieve optimal performance. The experimental results show that the harvester is sensitive to vibrations from arbitrary in-plane directions and it exhibits a bandwidth of 5.7 Hz and a maximum power of 13.4 mW at an acceleration of 0.6 g (with g = 9.8 ms−2).Keywords
Funding Information
- National High Technology Research and Development Program of China (2012AA040602)
- National Natural Science Foundation of China (61174017, 61203215)
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