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Towards a general method for estimating the unbalanced magnetic pull in mixed eccentricities motion including sufficiently large eccentricities in a hydropower generator and their validation against EM simulations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
DEE Universitat Politècnica de Catalunya , El Grupo de Compatibilidad Electromagnética GCEM, Barcelona.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0001-6016-6342
2013 (English)In: European Physical Journal: Applied physics, ISSN 1286-0042, E-ISSN 1286-0050, Vol. 63, no 2Article in journal (Refereed) Published
Abstract [en]

Electromagnetic (EM) analysis of hydropower generators is common practice but rotor whirling is little studied. This paper suggests a novel semi-analytical method for estimating the steady state unbalanced magnetic pull (UMP) when the rotor centre is undergoing mixed eccentricities motion. The ability to estimate the UMP for mixed eccentricities motion in finite element method (FEM)-based modelling software packages is rare. The proposed methodology in its formulation takes advantage of the fact that a purely dynamic eccentricity motion including non-synchronous whirling and a purely static eccentricity motion can be more amenable to implement in existing FEM-based EM modelling software products for UMP estimation. After these initial separate UMP results are obtained, the proposed method can be applied for virtually any mixed eccentricities motion cases up to sufficiently large eccentricities for quick analysis instead of running the mixed eccentricities simulations directly in a FEM-based software package. Good agreement between the UMP from the actual EM mixed eccentricities motion simulations in a commercial FEM-based software package and the UMP estimations by the novel method is made for a wide range of eccentricities that may commonly occur in practice. A modified feature selective validation (FSV) method, the FSV-UPC, is applied to assess the similarities and the differences in the UMP computations

Place, publisher, year, edition, pages
2013. Vol. 63, no 2
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3801DOI: 10.1051/epjap/2013130092ISI: 000323416700005Scopus ID: 2-s2.0-84977177356Local ID: 1a2eba60-34f7-4073-a2db-4bdb3698cf04OAI: oai:DiVA.org:ltu-3801DiVA, id: diva2:976662
Note
Validerad; 2013; Bibliografisk uppgift: Article Number: UNSP 20901 ; 20130920 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Calleecharan, YogeshwarsingAidanpää, Jan-Olov

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