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Investigation of magnetisation dynamics in ferromagnetic materials

  • In this work, the simulation possibilities of transient magnetic fields are investigated. For this purpose, an experimental setup is established to compare the simulation results with actual measurement data. The experimental set-up consists of two coils, which are placed on two U-shaped iron cores. These cores are then brought together to form two air-gaps. These two gaps are used for measurement and the optional insertion of samples. The simulations are carried out with the finite element method (FEM) program ANSYS Maxwell 19R3. In the first experiments, static simulations and measurements are compared to verify the validity of the available material data and the simulation techniques, especially the symmetry considerations, excitations of the coils, and boundary conditions. The static simulations show two main sources of uncertainty. The B-H curve of the core material used in the simulations and the air-gap distance uncertainty. After validating the simulations with the static measurements, transient experiments are performed. In these experiments, the qualitative agreement of the simulation and measurement, as well as the characteristic rise times are compared. The experiments show a decisive influence of the considered loss mechanisms on the agreement of the simulation results with the measurements. Therefore, several simulations with different loss mechanisms are performed. Finally, also the simulation capability including a material sample in the upper gap is investigated. Therefore, the conformity of the relative change of the measurement and the simulation is compared. In the experiments a good simulation capability within a 5% error bar is seen. The main difficulty of this work represents the uncertainty due to the available material data. It is assumed, that with more accurate material data the error can be reduced significantly.

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Author:Nico Feurle
Advisor:Andre Mitterbacher
Document Type:Master's Thesis
Year of publication:2021
Publishing Institution:FH Vorarlberg (Fachhochschule Vorarlberg)
Granting Institution:FH Vorarlberg (Fachhochschule Vorarlberg)
Release Date:2021/10/06
Tag:FEM; Finite element method; Magnetisation dynamics; Transient
Number of pages:X, 59
DDC classes:600 Technik, Medizin, angewandte Wissenschaften
Open Access?:ja
Course of Studies:Mechatronics
Licence (German):License LogoUrhG - The Austrian Copyright Act applies - Es gilt das österr. Urheberrechtsgesetz