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Magnetic flux guidance using H structures for miniature transducers

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Title: Magnetic flux guidance using H structures for miniature transducers
Authors: Wright, SW
Kiziroglou, ME
Yeatman, EM
Item Type: Conference Paper
Abstract: 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.
Issue Date: 6-Dec-2021
Date of Acceptance: 1-Dec-2021
URI: http://hdl.handle.net/10044/1/93738
DOI: 10.1109/powermems54003.2021.9658358
Publisher: IEEE
Start Page: 156
End Page: 159
Journal / Book Title: 2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)
Copyright Statement: © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor/Funder: Clean Sky 2 Joint Undertaking, European Union (EU), Horizon 2020, Programme Title: Smart Miniaturized and Energy Autonomous Regional Aircraft Wireless Sensor’, Acronym: SMARTWISE, Grant Number: 886605
Funder's Grant Number: 886605
Conference Name: 2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)
Keywords: Science & Technology
Physical Sciences
Energy & Fuels
Engineering, Electrical & Electronic
Nanoscience & Nanotechnology
Physics, Applied
Science & Technology - Other Topics
energy harvesting
flux concentrator
Publication Status: Published
Start Date: 2021-12-06
Finish Date: 2021-12-08
Conference Place: Exeter, United Kingdom
Online Publication Date: 2021-12-30
Appears in Collections:Electrical and Electronic Engineering
Faculty of Natural Sciences
Faculty of Engineering