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1
Content available Measurement and simulation of a rotational single sheet tester
Müller Fabian, Bavendiek Gregor, Schauerte Benedikt, Hameyer Kay
Archives of Electrical Engineering
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2019
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Vol. 68, nr 1
173--183
EN
The accurate prediction of iron losses has become a prominent problem in electromagnetic machine design. The basis of all iron loss models is found in the spatial field-locus of the magnetic flux density (B) and magnetic field (H). In this paper the behavior of the measured BH-field-loci is considered in FEM simulation. For this purpose, a vector hysteresis model is parameterized based on the global measurements, which then can be used to reproduce the measurement system and obtain more detailed insights on the device and its local field distribution. The IEM has designed a rotary loss tester for electrical steel, which can apply arbitrary BH-field-loci occurring during electrical machine operation. Despite its simplicity, the proposed pragmatic analytical model for vector hysteresis provides very promising results.
2
Content available Magnetization dependent demagnetization characteristic of rare-earth permanent magnets
Bavendiek Gregor, Müller Fabian, Sabirov Jamshid, Hameyer Kay
Archives of Electrical Engineering
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2019
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Vol. 68, nr 1
33--45
EN
Accurate demagnetization modelling is mandatory for a reliable design of rare- earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements.
3
Content available remote Problems in descriptions of hysteresis
Chwastek K.
Przegląd Elektrotechniczny
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2010
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R. 86, nr 4
24-27
EN
The idea of product model of hysteresis is presented. Some problems related to the description of reversible magnetization processes are discussed.
PL
Przedstawiono ideę modelu histerezy, w którym podatność różniczkowa jest iloczynem funkcji zależnej od magnetyzacji i sumy dwóch składników. Omówiono problemy związane z opisem procesów odwracalnych magnesowania.
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