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Electromagnetic linear vibration energy harvester using sliding permanent magnet array and ferrofluid as a lubricant

Title
Electromagnetic linear vibration energy harvester using sliding permanent magnet array and ferrofluid as a lubricant
Authors
Chae S.H.Ju S.Choi Y.Chi Y.-E.Ji C.-H.
Ewha Authors
지창현
SCOPUS Author ID
지창현scopus
Issue Date
2017
Journal Title
Micromachines
ISSN
2072-666XJCR Link
Citation
vol. 8, no. 10
Keywords
Electromagnetic generatorEnergy harvesterFerrofluidLow frequency vibration
Publisher
MDPI AG
Indexed
SCIE; SCOPUS WOS scopus
Abstract
We present an electromagnetic linear vibration energy harvester with an array of rectangular permanent magnets as a springless proof mass. Instead of supporting the magnet assembly with spring element, ferrofluid has been used as a lubricating material. When external vibration is applied laterally to the harvester, magnet assembly slides back and forth on the channel with reduced friction and wear due to ferrofluid, which significantly improves the long-term reliability of the device. Electric power is generated across an array of copper windings formed at the bottom of the aluminum housing. A proof-of-concept harvester has been fabricated and tested with a vibration exciter at various input frequencies and accelerations. For the device where 5 μL of ferrofluid was used for lubrication, maximum output power of 493 μWhas been generated, which was 4.37% higher than that without ferrofluid. Long-term reliability improvement due to ferrofluid lubrication has also been verified. For the device with ferrofluid, 1.02% decrease of output power has been observed, in contrast to 59.73% decrease of output power without ferrofluid after 93,600 cycles. © 2017 by the authors.
DOI
10.3390/mi8100288
Appears in Collections:
엘텍공과대학 > 전자공학과 > Journal papers
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