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Tunable spring balanced magnetic energy harvester for low frequencies and small displacements
RISE Research Institutes of Sweden, Digitala system, Smart hårdvara. Chalmers University of Technology, Sweden .
RISE Research Institutes of Sweden. Umeå University, Sweden.
ReVibe Energy AB, Sweden.
RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.ORCID-id: 0000-0002-0459-1157
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2022 (Engelska)Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 259, artikel-id 115568Artikel i tidskrift (Refereegranskat) 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)

Ort, förlag, år, upplaga, sidor
Elsevier Ltd , 2022. Vol. 259, artikel-id 115568
Nyckelord [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
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
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
Anmärkning

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 ).

Tillgänglig från: 2022-06-02 Skapad: 2022-06-02 Senast uppdaterad: 2023-05-16Bibliografiskt granskad

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Rusu, CristinaJohansson, Christer

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Energy Conversion and Management
Metallurgi och metalliska material

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