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Design of wideband vibration-based electromagnetic generator by means of dual-resonator

Ooi, B. L.; Gilbert, J. M.


B. L. Ooi


This paper describes the design of a wideband electromagnetic energy harvester that utilizes a novel dual-resonator method to improve the operational frequency range of the vibration-based generator. The device consists of two separate resonator systems (coil and magnet), which each comply with their respective resonance frequencies. This is because both resonators are designed in such a way that both magnet and coil components will oscillate at an additive phase angle, and hence create greater relative motion between the two dominating resonance frequencies, which realizes the wideband generator. Each resonator system consists of a distinctive cantilever beam, one attached with four magnets and steel keepers, the other attached with a copper coil and stainless steel holder as the free end mass. Both cantilevers are clamped and fitted to a common base that is subjected to a vibration source. Basic analytical models are derived and a numerical model is implemented in MATLAB-Simulink. Electromagnetic, structural modal and static mechanical analysis for the design of the prototype are completed using ANSYS finite element tools. For a 0.8 m sāˆ’2 acceleration, the open-loop voltage obtained from the experiment shows a good correlation with those from the simulation. Peak induced voltage is measured to be 259.5Vrms as compared to 240.9Vrms from the simulator at 21.3 Hz, which implies an error range of 7.7%. The results also indicate that there is a maximum of 58.22% improvement in the induced voltage within the intermediate region which occurs at the intersection point between the output response plots of two single resonator generators.


Ooi, B. L., & Gilbert, J. M. (2014). Design of wideband vibration-based electromagnetic generator by means of dual-resonator. Sensors and Actuators A: Physical, 213, 9-18.

Journal Article Type Article
Acceptance Date Mar 27, 2014
Online Publication Date Apr 5, 2014
Publication Date Jul 1, 2014
Deposit Date Feb 24, 2016
Publicly Available Date Feb 24, 2016
Journal Sensors and actuators a : physical
Print ISSN 0924-4247
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 213
Pages 9-18
Keywords Energy harvesting; Wideband harvester; Dual-resonator; Energy scavenging; Electromagnetic generator
Public URL
Publisher URL
Additional Information This is an authors accepted manuscript version of an article published in Sensors and actuators a : physical, 2014, v. 213.
Contract Date Feb 24, 2016


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