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An electromagnetic wearable 3-DoF resonance human body motion energy harvester using ferrofluid as a lubricant

Author

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  • Wu, Shuai
  • Luk, P.C.K.
  • Li, Chunfang
  • Zhao, Xiangyu
  • Jiao, Zongxia
  • Shang, Yaoxing

Abstract

Wearable energy harvester offers clean and continuous power for wearable sensors or devices, and plays an important role in a wide range of applications such as the health monitoring and motion track. In this study, we investigate a small electromagnetic resonance wearable kinetic energy harvester. It consists of a permanent magnet (PM) supported by two elastic strings within a rectangular box form a 3-degree-of-freedom (3-DoF) vibrator. Copper windings are attached to the outer surface of the box to generate electrical energy when the PM is forced to vibrate. To minimize any frictional losses, ferrofluid is used such that the poles of PM are cushioned by the ferrofluid, to the effect that the PM will not touch the inner of the box. Simulation results show that the ferrofluid can keep the PM ‘contactless’ from the box even subject to 10 times gravity acceleration. A prototype is built and tested under different loading conditions. Resistance load experimental results indicate the proposed harvester can generate 1.1mW in walking condition and 2.28mW in running condition. An energy storage circuit is employed and the energy storage experimental results show that the average storage power during walking and running conditions are 0.014mW and 0.149mW respectively. It is shown that the developed harvester can be readily attached on a shoe to offer continuous power supply for wearable sensors and devices.

Suggested Citation

  • Wu, Shuai & Luk, P.C.K. & Li, Chunfang & Zhao, Xiangyu & Jiao, Zongxia & Shang, Yaoxing, 2017. "An electromagnetic wearable 3-DoF resonance human body motion energy harvester using ferrofluid as a lubricant," Applied Energy, Elsevier, vol. 197(C), pages 364-374.
    • Handle: RePEc:eee:appene:v:197:y:2017:i:c:p:364-374
    DOI: 10.1016/j.apenergy.2017.04.006
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    References listed on IDEAS

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    1. Vocca, Helios & Neri, Igor & Travasso, Flavio & Gammaitoni, Luca, 2012. "Kinetic energy harvesting with bistable oscillators," Applied Energy, Elsevier, vol. 97(C), pages 771-776.
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    Cited by:

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    2. Mohammed Sobhy & Fatemah H. H. Al Mukahal, 2022. "Wave Dispersion Analysis of Functionally Graded GPLs-Reinforced Sandwich Piezoelectromagnetic Plates with a Honeycomb Core," Mathematics, MDPI, vol. 10(17), pages 1-22, September.
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    5. Madinei, H. & Haddad Khodaparast, H. & Friswell, M.I. & Adhikari, S., 2018. "Minimising the effects of manufacturing uncertainties in MEMS Energy harvesters," Energy, Elsevier, vol. 149(C), pages 990-999.
    6. Fan, Kangqi & Cai, Meiling & Liu, Haiyan & Zhang, Yiwei, 2019. "Capturing energy from ultra-low frequency vibrations and human motion through a monostable electromagnetic energy harvester," Energy, Elsevier, vol. 169(C), pages 356-368.
    7. Yurchenko, D. & Lai, Z.H. & Thomson, G. & Val, D.V. & Bobryk, R.V., 2017. "Parametric study of a novel vibro-impact energy harvesting system with dielectric elastomer," Applied Energy, Elsevier, vol. 208(C), pages 456-470.
    8. Li, Zhongjie & Yang, Zhengbao & Naguib, Hani E., 2020. "Introducing revolute joints into piezoelectric energy harvesters," Energy, Elsevier, vol. 192(C).
    9. Toyabur Rahman, M. & Sohel Rana, SM & Salauddin, Md. & Maharjan, Pukar & Bhatta, Trilochan & Kim, Hyunsik & Cho, Hyunok & Park, Jae Yeong, 2020. "A highly miniaturized freestanding kinetic-impact-based non-resonant hybridized electromagnetic-triboelectric nanogenerator for human induced vibrations harvesting," Applied Energy, Elsevier, vol. 279(C).
    10. Janjua, Ahmed Nawaz & Shaefer, Maxwell & Amini, Seyed Hassan & Noble, Aaron & Shahab, Shima, 2024. "Vibrational energy transmission in underground continuous mining: Dynamic characteristics and experimental research of field data," Applied Energy, Elsevier, vol. 354(PA).
    11. Liu, Mingyi & Lin, Rui & Zhou, Shengxi & Yu, Yilun & Ishida, Aki & McGrath, Margarita & Kennedy, Brook & Hajj, Muhammad & Zuo, Lei, 2018. "Design, simulation and experiment of a novel high efficiency energy harvesting paver," Applied Energy, Elsevier, vol. 212(C), pages 966-975.

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