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Title [sv]
Modellering av nya olinjära permanentmagnetiska material för energitillämpningar
Title [en]
Modelling novel nonlinear permanent magnet materials for energy applications
Abstract [en]
There are several ongoing research projects with the aim to find novel, rare earth metal free permanent magnets to substitute the commonly used neodymium-iron-boron magnets. To facilitate this research and evaluate possible magnet candidates there is a need for nonlinear material models to model magnets in electrical machines. The neodymium-iron-boron magnets can be modelled with linear models whereas preliminary results indicate novel materials to have nonlinear magnetic properties. This research project aims at developing a computationally efficient method for modelling nonlinear materials for use in existing finite element method based simulation tools for electrical machines connected to an electrical circuit. The method will be experimentally verified. Ones the method is verified it will be used to investigate the stability of nonlinear magnets when used in electrical machines with the goal to determine how nonlinear a material can be to be considered a candidate as a permanent magnet for electrical machines. Previous results indicate that the stability of a material’s magnetic properties might not be as important for large slow-rotating wind power generators as for high-speed electrical motors, so the materials will be evaluated for different applications. The research will be performed by a PhD student and the main applicant during four years. An overall goal with this project is to contribute to a more sustainable society.
Publications (2 of 2) Show all publications
Ibrayeva, A., Lind, E., Silva, M. D., Ghorai, S. & Eriksson, S. (2023). Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles. In: 2023 IEEE International Magnetic Conference (INTERMAG): . Paper presented at IEEE International Magnetic Conference (INTERMAG), May 15-19, 2023, Sendai, Japan. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles
Show others...
2023 (English)In: 2023 IEEE International Magnetic Conference (INTERMAG), Institute of Electrical and Electronics Engineers (IEEE), 2023Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the measurement results of the BH/MH curves of the Alnico 8 (LNGT40) with recoil loops and a mathematical model for the calculation of the average magnetic flux density in a cubic permanent magnet. The measurements were performed with a Vibrating Sample Magnetometer (VSM). The magnet samples have a cubic shape with 3 mm sides. BH curves in preferred (easy) and transverse directions and recoil loops were measured and compared to Alnico 9 (LNGT72) as well as to the data from the supplier. The load line of the cubic magnet in 0 A/m applied magnetic field was found. A mathematical model was developed which can approximate the MH a curve for an applied field with an arbitrarily chosen angle between the field and easy axis, given MH a curves for 0o and 90o. Also, a simplified general model of a cubic permanent magnet in the air and calculation results of stored energy and hysteresis losses were presented.
Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Series
International Conference on Magnetics, ISSN 2150-4598, E-ISSN 2150-4601
Keywords
Alnico magnets, BH curve, Demagnetization, Permanent Magnet, Recoil Line
National Category
Other Physics Topics Other Electrical Engineering, Electronic Engineering, Information Engineering Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-520985 (URN)10.1109/INTERMAG50591.2023.10265100 (DOI)001090594700054 ()979-8-3503-3246-9 (ISBN)979-8-3503-3247-6 (ISBN)
Conference
IEEE International Magnetic Conference (INTERMAG), May 15-19, 2023, Sendai, Japan
Funder
Swedish Research Council, 2018-04617StandUp
Available from: 2024-01-18 Created: 2024-01-18 Last updated: 2024-04-22Bibliographically approved
Westerberg, A., Boggavarapu, S. R. & Eriksson, S.Anisotropic Model of Nonlinear Permanent Magnets in Finite Element Method Software.
Open this publication in new window or tab >>Anisotropic Model of Nonlinear Permanent Magnets in Finite Element Method Software
(English)Manuscript (preprint) (Other academic)
Keywords
Aluminum-nickel-cobalt (Alnico), COMSOL, demagnetization, finite element method (FEM), nonlinear permanent magnets, permanent magnet synchronous generator (PMSG), recoil line
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-527352 (URN)
Available from: 2024-04-29 Created: 2024-04-29 Last updated: 2024-04-29
Principal InvestigatorEriksson, Sandra
Coordinating organisation
Uppsala University
Funder
Period
2019-01-01 － 2022-12-31
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
DiVA, id: project:6153Project, id: 2018-04617_VR
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