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A multi-stable rotational energy harvester using a rolling sphere and magnetic coupling for ultra-low frequency motions

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conference contribution
posted on 2023-10-18, 15:33 authored by Sayed Masabi, Hailing Fu, Stephanos TheodossiadesStephanos Theodossiades
Limited power supply is a continuing challenge with wireless sensors due to depleting nature of batteries. Vibration energy harvesters provide a promising alternative solution, but they also face limitations when harnessing broadband and low frequency energy sources, such as that available from wind turbine tower vibrations and human body motions. This paper presents a novel multi-stable broadband rotational energy harvester using magnetic coupling and a rolling sphere to harness ultra-low frequency motions. A spherical magnet, placed in a circular path, is used as an inertial mass to absorb ambient vibrations. Eight tethering magnets are placed underneath the path to create eight equilibria of the rolling sphere. The same number of coils are placed above the rolling path and are aligned with the tethering magnets, such that the rolling magnet can provide the maximum rate of magnetic flux change. A prototype was fabricated and tested on a mechanical slider. The device can operate in the cross-well motions over a wide frequency bandwidth (1.5 - 2.5 Hz). With a 44 Ω external load, the device is capable of transferring 8.1mW output power under 2.5 Hz and 0.9g excitations. The self-powered sensing was also tested using the harvester. 1.91 mJ of energy is stored in a 330 μF capacitor within 116 s.

Funding

Research Grants (RGS\R2\202148)

International Exchanges Grant (IEC\NSFC\211070) funded by the Royal Society, UK

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

Pages

102 - 105

Source

2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

Publisher

IEEE

Version

  • AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publication date

2023-01-13

Copyright date

2022

ISBN

9781665493062

Language

  • en

Location

Salt Lake City, UT, USA

Event dates

12th December 2022 - 15th December 2022

Depositor

Sayed Masabi. Deposit date: 17 October 2023

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