Electromagnetic Linear Vibration Energy Harvester Using Sliding Permanent Magnet Array and Ferrofluid as a Lubricant
| Autor: | Chang Hyeon Ji, Song Hee Chae, Suna Ju, Ye Eun Chi, Yunhee Choi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Ferrofluid
Materials science Acoustics lcsh:Mechanical engineering and machinery ferrofluid low frequency vibration energy harvester electromagnetic generator 02 engineering and technology 01 natural sciences Article 0103 physical sciences lcsh:TJ1-1570 Electrical and Electronic Engineering Lubricant 010302 applied physics business.industry Mechanical Engineering Electrical engineering 021001 nanoscience & nanotechnology Power (physics) Vibration Control and Systems Engineering Electromagnetic coil Magnet Lubrication Proof mass 0210 nano-technology business |
| Zdroj: | Micromachines, Vol 8, Iss 10, p 288 (2017) Micromachines Micromachines; Volume 8; Issue 10; Pages: 288 |
| Popis: | 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 μW has 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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