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Analysis of Epstein frame by Finite Element Method DOI:10.15199/48.2019.06.05

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The previous work was to build up an Epstein frame. The measurement results and the implementation of the Jiles-Atherton hysteresis model into COMSOL Multiphysics have been published in [20]. The objective of this work is to compare computational time using COMSOL Multiphysics with different techniques. The main goal is to reduce the software simulation time as much as possible while the accuracy of the results should not decrease. The Epstein frame has been modelled in 2D. These results will be used later in Linear Parameter Varying (LPV) [3, 16] modelling of the frequency and temperature properties of an induction machine [8, 11, 14, 19]. The Epstein frame The Epstein frame is used to measure magnetic properties of electrical steels [4, 10, 12, 18]. The building and measuring process have been published [20]. The measurements have been performed analysing the material M250-35A produced by the ArceroMittal. During measurements, current excitation has been applied with a control mechanism to obtain sinusoidal induced voltage and magnetic flux density. Measurements have been performed applying 7 different frequencies with 8 different amplitudes. Fast Fourier Transform (FFT) have been used where every harmonic component have been removed. These filtered excitation signals have been used during the simulations, too. In Fig.1. the completed frame can be seen. Fig.1. The measurement ready Epstein frame The Jiles-Atherton model While measuring ferromagnetic materials, hysteresis phenomenon can be observed [1, 2, 9, 13, 15]. For this work, the Jiles-Atherton hysteresis model has been chosen. The necessary formulas can be found in [6, 7, 17]. The following equations have been implemented into the frame of COMSOL Multiphysics: [...]

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