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Optimisation of a tubular linear machine with permanent magnets for wave energy extraction

Optimisation of a tubular linear machine with permanent magnets for wave energy extraction
Optimisation of a tubular linear machine with permanent magnets for wave energy extraction
Purpose
The purpose of this paper is to optimise the cost-based performance of a tubular linear generator and to minimise cogging forces.

Design/methodology/approach
Optimisation of a tubular linear generator with longitudinal flux topology has been undertaken using a finite element method. The computational models used have been verified experimentally.

Findings
The use of an oversized stator linear generator design as opposed to an oversized translator design has the potential to increase the output electromotive force per unit material cost by 25 per cent for slotless iron core topologies and approximately 14 per cent for air core topologies. For cogging force minimisation, optimisation of the length of the stator core is an effective technique for both oversized stator and oversized translator constructions. Comparisons of magnet materials also indicate that the higher cost of rare earth magnets to ferrites is compensated by their superior specific performances.

Originality/value
In this paper, a broader range of design parameters than in previous investigations has been optimised for the slotless iron core and air core topologies. The result relating to cogging force reduction and cost savings (in particular) has the potential to make direct drive wave energy extraction a more competitive technology in terms of reliability and cost.
generators, energy sources, water power
0332-1649
1056-1068
Parel, Thomas S.
d1e88705-ba8a-42c0-8c1b-f9bf190227b8
Rotaru, Mihai D.
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Hearn, Grant E.
c1b2912b-fe5c-432c-aaa4-39c5eff75178
Parel, Thomas S.
d1e88705-ba8a-42c0-8c1b-f9bf190227b8
Rotaru, Mihai D.
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Hearn, Grant E.
c1b2912b-fe5c-432c-aaa4-39c5eff75178

Parel, Thomas S., Rotaru, Mihai D., Sykulski, Jan K. and Hearn, Grant E. (2011) Optimisation of a tubular linear machine with permanent magnets for wave energy extraction. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 30 (3), 1056-1068. (doi:10.1108/03321641111110997).

Record type: Article

Abstract

Purpose
The purpose of this paper is to optimise the cost-based performance of a tubular linear generator and to minimise cogging forces.

Design/methodology/approach
Optimisation of a tubular linear generator with longitudinal flux topology has been undertaken using a finite element method. The computational models used have been verified experimentally.

Findings
The use of an oversized stator linear generator design as opposed to an oversized translator design has the potential to increase the output electromotive force per unit material cost by 25 per cent for slotless iron core topologies and approximately 14 per cent for air core topologies. For cogging force minimisation, optimisation of the length of the stator core is an effective technique for both oversized stator and oversized translator constructions. Comparisons of magnet materials also indicate that the higher cost of rare earth magnets to ferrites is compensated by their superior specific performances.

Originality/value
In this paper, a broader range of design parameters than in previous investigations has been optimised for the slotless iron core and air core topologies. The result relating to cogging force reduction and cost savings (in particular) has the potential to make direct drive wave energy extraction a more competitive technology in terms of reliability and cost.

Text
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More information

Published date: 2011
Keywords: generators, energy sources, water power
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 348699
URI: http://eprints.soton.ac.uk/id/eprint/348699
ISSN: 0332-1649
PURE UUID: 5e6dba8f-4d78-4d51-93c5-ee3ed01217af
ORCID for Jan K. Sykulski: ORCID iD orcid.org/0000-0001-6392-126X

Catalogue record

Date deposited: 18 Feb 2013 14:32
Last modified: 20 Jul 2019 01:28

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Contributors

Author: Thomas S. Parel
Author: Mihai D. Rotaru
Author: Jan K. Sykulski ORCID iD
Author: Grant E. Hearn

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