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A two-dimensional electromagnetic vibration energy harvester with variable stiffness

Author

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  • Imbaquingo, Carlos
  • Bahl, Christian
  • Insinga, Andrea R.
  • Bjørk, Rasmus

Abstract

This work investigates the performance of an electromagnetic vibration harvester for two-dimensional vibrations with variable magnetic stiffness and electromagnetic damping. The device consists of a free-to-move cylindrical magnetic structure with a set of bearings located on top and bottom, a couple of coils located on top and bottom of the device and finally a fixed system of disk-shaped magnets placed inside a ring holder. The number of disk-shaped magnets in the ring holder can be varied to change the magnetic stiffness of the system. The performance of the device is characterized experimentally for nine different configurations of disk-shaped magnets, exploring both symmetric and asymmetric designs. Using an XY-shaker to vibrate the system in two dimensions in frequencies from 1 Hz to 10 Hz and with motion amplitude of 2 mm on both axes, a maximum power of 27 mW was harvested. This occurs for an asymmetric device, i.e. with different magnetic stiffnesses along its two axis. For symmetric devices the power is lower by a factor of two. Finally, varying the electromagnetic damping, which is controlled by varying the coil dimensions, can further increase the power to 42 mW.

Suggested Citation

  • Imbaquingo, Carlos & Bahl, Christian & Insinga, Andrea R. & Bjørk, Rasmus, 2022. "A two-dimensional electromagnetic vibration energy harvester with variable stiffness," Applied Energy, Elsevier, vol. 325(C).
    • Handle: RePEc:eee:appene:v:325:y:2022:i:c:s0306261922009497
    DOI: 10.1016/j.apenergy.2022.119650
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    References listed on IDEAS

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    1. Tri Nguyen, Hieu & Genov, Dentcho A. & Bardaweel, Hamzeh, 2020. "Vibration energy harvesting using magnetic spring based nonlinear oscillators: Design strategies and insights," Applied Energy, Elsevier, vol. 269(C).
    2. Krzysztof Kecik & Marcin Kowalczuk, 2021. "Effect of Nonlinear Electromechanical Coupling in Magnetic Levitation Energy Harvester," Energies, MDPI, vol. 14(9), pages 1-16, May.
    3. Carneiro, Pedro & Soares dos Santos, Marco P. & Rodrigues, André & Ferreira, Jorge A.F. & Simões, José A.O. & Marques, A. Torres & Kholkin, Andrei L., 2020. "Electromagnetic energy harvesting using magnetic levitation architectures: A review," Applied Energy, Elsevier, vol. 260(C).
    4. Wang, Yifeng & Li, Shoutai & Gao, Mingyuan & Ouyang, Huajiang & He, Qing & Wang, Ping, 2021. "Analysis, design and testing of a rolling magnet harvester with diametrical magnetization for train vibration," Applied Energy, Elsevier, vol. 300(C).
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    Cited by:

    1. Vidal, João V. & Carneiro, Pedro M.R. & Soares dos Santos, Marco P., 2024. "A complete physical 3D model from first principles of vibrational-powered electromagnetic generators," Applied Energy, Elsevier, vol. 357(C).

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