Imperial College London
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DrStevenWright

Faculty of Engineering, Department of Electrical and Electronic Engineering

Senior Teaching Fellow
 
 
 
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Contact

 

+44 (0)20 7594 6206s.wright02

 
 
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Location

 

1008BElectrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Wright:2021:10.1109/powermems54003.2021.9658358,
author = {Wright, SW and Kiziroglou, ME and Yeatman, EM},
doi = {10.1109/powermems54003.2021.9658358},
pages = {156--159},
publisher = {IEEE},
title = {Magnetic flux guidance using H structures for miniature transducers},
url = {http://dx.doi.org/10.1109/powermems54003.2021.9658358},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - Limited magnetic flux has been a significant restriction in the applicability of scaled-down inductive energy, sensing and actuating devices. Magnetic flux concentration could potentially address this challenge by offering higher flux density B and thereby higher transduction power density, sensitivity and force in the small scale. In this paper, a study of flux concentration from a flux path perspective is presented. Numerical simulations show that high permeability cylindrical cores can achieve a flux concentration ratio in the scale of their aspect ratio, as they gather flux from their reachable vicinity. Flux guiding structures such as H-shapes can concentrate the flux incident to their surface and guide it through a small cross-section, achieving a higher concentration ratio. In an experimental study, a flux concentration factor of 6 is reported using a single 5 mm diameter, 20 mm high cylinder, and an additional increase factor of 4.3 from the addition of 70 mm × 12 mm × 2 mm flanges. A total B amplification ratio of 26 is demonstrated. As an application demonstrator, this approach is employed in an inductive energy harvester yielding 11.4 mW average power output (0.3 mW/g) from a 0.12 mT RMS, 800 Hz field.
AU  - Wright,SW
AU  - Kiziroglou,ME
AU  - Yeatman,EM
DO  - 10.1109/powermems54003.2021.9658358
EP  - 159
PB  - IEEE
PY  - 2021///
SP  - 156
TI  - Magnetic flux guidance using H structures for miniature transducers
UR  - http://dx.doi.org/10.1109/powermems54003.2021.9658358
UR  - https://ieeexplore.ieee.org/document/9658358
UR  - http://hdl.handle.net/10044/1/93738
ER  -
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