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A micro electromagnetic generator for vibration energy harvesting

Beeby, S P, Torah, R N, Tudor, M J, Glynne-Jones, P, O'Donnell, T, Saha, C R and Roy, S (2007) A micro electromagnetic generator for vibration energy harvesting Journal of Micromechanics and Microengineering, 17, (7), pp. 1257-1265.

Record type: Article


Vibration energy harvesting is receiving a considerable amount of interest as a means for powering wireless sensor nodes. This paper presents a small (component volume 0.1 cm3, practical volume 0.15 cm3) electromagnetic generator utilizing discrete components and optimized for a low ambient vibration level based upon real application data. The generator uses four magnets arranged on an etched cantilever with a wound coil located within the moving magnetic field. Magnet size and coil properties were optimized, with the final device producing 46 µW in a resistive load of 4 k? from just 0.59 m s-2 acceleration levels at its resonant frequency of 52 Hz. A voltage of 428 mVrms was obtained from the generator with a 2300 turn coil which has proved sufficient for subsequent rectification and voltage step-up circuitry. The generator delivers 30% of the power supplied from the environment to useful electrical power in the load. This generator compares very favourably with other demonstrated examples in the literature, both in terms of normalized power density and efficiency.

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Published date: July 2007
Keywords: Energy harvesting
Organisations: EEE


Local EPrints ID: 264798
ISSN: 0960-1317
PURE UUID: 80126513-d8cb-4be5-acfb-66ac7e15985d
ORCID for S P Beeby: ORCID iD
ORCID for P Glynne-Jones: ORCID iD

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Date deposited: 07 Nov 2007
Last modified: 24 Jul 2017 16:41

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Author: S P Beeby ORCID iD
Author: R N Torah
Author: M J Tudor
Author: P Glynne-Jones ORCID iD
Author: T O'Donnell
Author: C R Saha
Author: S Roy

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