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Magnetic tuning of a kinetic energy harvester using variable reluctance

Magnetic tuning of a kinetic energy harvester using variable reluctance
Magnetic tuning of a kinetic energy harvester using variable reluctance
In this paper we present a new technique for tuning the resonant frequency of an energy harvester using a variable reluctance device which changes the strain in a cantilever beam to alter its spring constant. In order for energy harvesting devices to be able to operate reliably in many applications they must be able to generate energy as the input excitation frequency changes. Most harvesters are resonantly tuned mass-spring-damper devices and therefore it is important that their resonant frequency is tuneable during operation. Several mechanical methods have previously been demonstrated for accomplishing this task which operates by altering the stress in a cantilever beam by altering the distance between a fixed tuning magnet and a magnet on the moving cantilever. Here, we demonstrate a new actuation method for manipulating the stress in a beam. The actuation mechanism alters the magnetic reluctance between the cantilever mounted and the fixed magnet. The investigation has highlighted the importance of the design of the magnetic circuit and choice of materials in order to avoid eddy current damping and asymmetrical forces. The method presented here has demonstrated a maximum tunable frequency range of 11.1 Hz and may be more suitable for microfabrication than the previously reported techniques due to the reduced tuning force which makes microfabricated actuators feasible.
0924-4247
266-275
Ayala-Gacia, Ivo
a5698116-ff2d-4d3e-89c9-b22052dd3a41
Mitcheson, Paul
d50a092b-8df6-4530-9ac4-76eeead72022
Yeatman, Eric
7b21b3fc-a815-4305-a75e-c1698ff6dbda
Zhu, Dibin
ec52eae1-39fa-427c-968b-e76089a464a6
Tudor, M.J.
46eea408-2246-4aa0-8b44-86169ed601ff
Beeby, S.P.
ba565001-2812-4300-89f1-fe5a437ecb0d
Ayala-Gacia, Ivo
a5698116-ff2d-4d3e-89c9-b22052dd3a41
Mitcheson, Paul
d50a092b-8df6-4530-9ac4-76eeead72022
Yeatman, Eric
7b21b3fc-a815-4305-a75e-c1698ff6dbda
Zhu, Dibin
ec52eae1-39fa-427c-968b-e76089a464a6
Tudor, M.J.
46eea408-2246-4aa0-8b44-86169ed601ff
Beeby, S.P.
ba565001-2812-4300-89f1-fe5a437ecb0d

Ayala-Gacia, Ivo, Mitcheson, Paul, Yeatman, Eric, Zhu, Dibin, Tudor, M.J. and Beeby, S.P. (2013) Magnetic tuning of a kinetic energy harvester using variable reluctance. Sensors and Actuators A: Physical, 189, 266-275. (doi:10.1016/j.sna.2012.11.004).

Record type: Article

Abstract

In this paper we present a new technique for tuning the resonant frequency of an energy harvester using a variable reluctance device which changes the strain in a cantilever beam to alter its spring constant. In order for energy harvesting devices to be able to operate reliably in many applications they must be able to generate energy as the input excitation frequency changes. Most harvesters are resonantly tuned mass-spring-damper devices and therefore it is important that their resonant frequency is tuneable during operation. Several mechanical methods have previously been demonstrated for accomplishing this task which operates by altering the stress in a cantilever beam by altering the distance between a fixed tuning magnet and a magnet on the moving cantilever. Here, we demonstrate a new actuation method for manipulating the stress in a beam. The actuation mechanism alters the magnetic reluctance between the cantilever mounted and the fixed magnet. The investigation has highlighted the importance of the design of the magnetic circuit and choice of materials in order to avoid eddy current damping and asymmetrical forces. The method presented here has demonstrated a maximum tunable frequency range of 11.1 Hz and may be more suitable for microfabrication than the previously reported techniques due to the reduced tuning force which makes microfabricated actuators feasible.

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Published date: 15 January 2013
Organisations: EEE

Identifiers

Local EPrints ID: 346014
URI: https://eprints.soton.ac.uk/id/eprint/346014
ISSN: 0924-4247
PURE UUID: 6bf70b65-be9b-4d92-962e-b0bbf1bfb14b
ORCID for S.P. Beeby: ORCID iD orcid.org/0000-0002-0800-1759

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Date deposited: 11 Dec 2012 14:20
Last modified: 06 Jun 2018 13:07

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Contributors

Author: Ivo Ayala-Gacia
Author: Paul Mitcheson
Author: Eric Yeatman
Author: Dibin Zhu
Author: M.J. Tudor
Author: S.P. Beeby ORCID iD

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