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Tunable spring balanced magnetic energy harvester for low frequencies and small displacements
RISE Research Institutes of Sweden, Digital Systems, Smart Hardware. Chalmers University of Technology, Sweden .
RISE Research Institutes of Sweden. Umeå University, Sweden.
ReVibe Energy AB, Sweden.
RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.ORCID iD: 0000-0002-0459-1157
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2022 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 259, article id 115568Article in journal (Refereed) Published
Abstract [en]

In this paper we present a novel concept to efficiently harvest vibrational energy at low frequencies and very small displacement. We describe and evaluate an electromagnetic energy harvester which generates power from a magnetic circuit with motion induced variations of an air gap. External vibrations induce oscillations of the gap length around an equilibrium point, due to a linear spring counteracting the magnetic force. The relative position of the spring can be adjusted to optimize the harvester output for excitation amplitude and frequency. A simulation model is built in COMSOL and verified by comparison with lab measurements. The simulation model is used to determine the potential performance of the proposed concept under both harmonic and non-harmonic excitation. Under harmonic excitation, we achieve a simulated RMS load power of 26.5 μW at 22 Hz and 0.028 g acceleration amplitude. From a set of comparable EH we achieve the highest theoretical power metric of 1712.2 µW/cm3/g2 while maintaining the largest relative bandwidth of 81.8%. Using measured non-harmonic vibration data, with a mean acceleration of 0.039 g, resulted in a mean power of 52 μW. Moreover, the simplicity and robustness of our design makes it a competitive alternative for use in practical situations. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 259, article id 115568
Keywords [en]
Automotive safety, Electromagnetic induction, Low frequency, Nonlinear dynamics, Small amplitude excitation, Vibration energy harvesting, Electric excitation, Electromagnetic waves, Harmonic analysis, Magnetic circuits, Vehicle safety, Amplitude excitation, Energy Harvester, Harmonic excitation, Lower frequencies, Simulation model, Small amplitude, Small displacement, Energy harvesting
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:ri:diva-59230DOI: 10.1016/j.enconman.2022.115568Scopus ID: 2-s2.0-85127701559OAI: oai:DiVA.org:ri-59230DiVA, id: diva2:1663298
Note

Funding details: Stiftelsen för Strategisk Forskning, SSF, 2017-03725, FID16-0055; Funding text 1: This work has received funding from Swedish Foundation for Strategic Research in the program for ‘Research Institute PhD’ (grant no. FID16-0055 ) and the Sweden’s Innovation Agency , Vinnova, grant Challenge-Driven Innovation ‘Energy Toolkit’ (no. 2017-03725 ).

Available from: 2022-06-02 Created: 2022-06-02 Last updated: 2023-05-16Bibliographically approved

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Rusu, CristinaJohansson, Christer

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