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- Title
Vibration Energy Harvester Based on Torsionally Oscillating Magnet.
- Authors
Wang, Xinyi; Li, Jiaxing; Zhou, Chenyuan; Tao, Kai; Qiao, Dayong; Li, Yunjia
- Abstract
Most of the miniaturized electromagnetic vibrational energy harvesters (EVEHs) are based on oscillating proof mass suspended by several springs or a cantilever structure. Such structural feature limits the miniaturization of the device's footprint. This paper presents an EVEH device based on a torsional vibrating magnet over a stack of flexible planar coils. The torsional movement of the magnet is enabled by microfabricated silicon torsional springs, which effectively reduce the footprint of the device. With a size of 1 cm × 1 cm × 1.08 cm, the proposed EVEH is capable of generating an open-circuit peak-to-peak voltage of 169 mV and a power of 6.9 μW, under a sinusoidal excitation of ±0.5 g (g = 9.8 m/s2) and frequency of 96 Hz. At elevated acceleration levels, the maximum peak-to-peak output voltage is 222 mV under the acceleration of 7 g (±3.5 g).
- Subjects
OPEN-circuit voltage; ELECTROMAGNETIC waves; MAGNETS; CANTILEVERS
- Publication
Micromachines, 2021, Vol 12, Issue 12, p1545
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi12121545