TY - GEN
T1 - A Multi-Stable Rotational Energy Harvester Using a Rolling Sphere and Magnetic Coupling for Ultra-Low Frequency Motions
AU - Masabi, Sayed N.
AU - Fu, Hailing
AU - Theodossiades, Stephanos
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Energy harvesting
KW - low-frequency motion
KW - magnetic coupling
KW - multi-stability
KW - self-powered sensing
UR - http://www.scopus.com/inward/record.url?scp=85147020656&partnerID=8YFLogxK
U2 - 10.1109/PowerMEMS56853.2022.10007612
DO - 10.1109/PowerMEMS56853.2022.10007612
M3 - Conference contribution
AN - SCOPUS:85147020656
T3 - 2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2022
SP - 102
EP - 105
BT - 2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2022
Y2 - 12 December 2022 through 15 December 2022
ER -
