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Anisotropic Model of Nonlinear Permanent Magnets in Finite Element Method Software
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för elektroteknik, Elektricitetslära. (Sandra Eriksson)
Department of Electrical Engineering, Indian Institute of Technology Dharwad, Karnataka 580011, India.ORCID-id: 0000-0002-4406-1070
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för elektroteknik, Elektricitetslära.ORCID-id: 0000-0001-8598-2565
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord [en]
Aluminum-nickel-cobalt (Alnico), COMSOL, demagnetization, finite element method (FEM), nonlinear permanent magnets, permanent magnet synchronous generator (PMSG), recoil line
Nationell ämneskategori
Annan elektroteknik och elektronik
Forskningsämne
Teknisk fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-527352OAI: oai:DiVA.org:uu-527352DiVA, id: diva2:1854988
Ingår i projekt
Modellering av nya olinjära permanentmagnetiska material för energitillämpningar, VetenskapsrådetTillgänglig från: 2024-04-29 Skapad: 2024-04-29 Senast uppdaterad: 2024-04-29
Ingår i avhandling
1. Nonlinear models of permanent magnets for electrical machines
Öppna denna publikation i ny flik eller fönster >>Nonlinear models of permanent magnets for electrical machines
2024 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The increased demand for electricity, environmental problems related to mining of rare earth metals and to usage of fossil fuels, national security issues, and monopolization of the rare earth metals market forcing society to explore alternative options for conventional rare earth permanent magnets. Generally, the relationship between magnetic flux density and the magnetic field of permanent magnets has a nonlinear shape, but the operating region of conventional permanent magnets is linear. There is no convenient model of permanent magnets in existing commercial finite element method software that models partial demagnetization and remagnetization of nonlinear permanent magnets correctly. This thesis presents a model that is able to model an electrical machine with nonlinear permanent magnets and does not require a large computational power. A gradual improvement of the model resulted in four versions of it. It started with a simple linear model and ended with a model that is able to simulate partial demagnetization and remagnetization of the magnet and includes all four quadrants of the BH loop. Also, the last version limits the maximum magnetization depending on the angle of normalized magnetization. The magnetic characteristics of Alnico 8 LNGT40 and Alnico 9 LNGT72 magnets were measured in a vibrating sample magnetometer in order to obtain the material data required for this research work. A mathematical model of the MH loops of Alnico 8 LNGT40 in different directions was developed. The models of a synchronous permanent magnet generator with a spoke type topology with Alnico 5, 8 and 9 magnets were tested under normal and three phase short circuit conditions. The results were compared and discussed. It is found Alnico 5 is more sensitive to short circuit than Alnico 8 and 9. Electric steel clamps holding the permanent magnets and airgap above the magnets protect them from demagnetization.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2024. s. 62
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2404
Nyckelord
Aluminum-nickel-cobalt (Alnico), COMSOL, demagnetization, finite element method (FEM), nonlinear permanent magnets, permanent magnet synchronous generator (PMSG), recoil line
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:uu:diva-527007 (URN)978-91-513-2136-3 (ISBN)
Disputation
2024-06-13, Room 80101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Vetenskapsrådet, 2018-04617
Tillgänglig från: 2024-05-20 Skapad: 2024-04-22 Senast uppdaterad: 2024-05-23

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Westerberg, AnarBoggavarapu, Sai RamEriksson, Sandra

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