Abstract
The design of electrical machines and magnetic actuators requires accurate models to represent hysteresis effects in ferromagnetic materials. The magnetic nonlinearity of the iron core is usually considered by an anhysteretic magnetization curve. With this assumption, hysteresis’ effects in the field computation are completely neglected. This paper presents a comparative study of different hysteresis models, particularly Pragmatic Algebraic Model (PAM) and vector stop model, with regard to a vector anhysteretic anisotropic model. The PAM turns out to be an efficient model implemented with one mathematical equation. The multi cells stop model relies on a consistent thermodynamic formulation, whose dissipation corresponds to a dry friction-like element. Both models implement a constitutive relationship, in which the magnetic flux density vector as independent input and magnetic field strength as output. With a rotational single sheet tester (RSST), various tests for a sample of material FeSi24-50A (FeSi) with a silicon proportion of 2.4 wt% can be proceeded under the application of relevant field distribution. The obtained measured data are applied to parameterize and validate the models. Following numerical experiments the results are compared with those obtained by means of an anhysteretic anisotropic model.
Highlights
The anisotropic characterization of non-oriented (NO) soft magnetic materials depends on the shape of ferromagnetic crystal and magnetic moment
Afterwards, to produce the magnetic core of rotating electrical machines, manufacturing processes are applied to these NO soft magnetic materials
We focus on the vector stop model based on vectorized stop operators and an anhysteretic magnetization model predicated on measurements
Summary
The anisotropic characterization of non-oriented (NO) soft magnetic materials depends on the shape of ferromagnetic crystal and magnetic moment. There are several vector hysteresis play and stop models, which can predict the magnetic anisotropy of the electrical steel sheets. The play and stop operators can be vectorized directly [7] In both ways, the vector hysteresis models can get the anisotropic magnetization properties from different directions. These two vector hysteresis models have B as input and H as output variable. The aim of this paper is to present a comparison study for two different vector hysteresis models and one anhysteretic anisotropic model by setting up numerical experiments. It gives insight into each model and helps selecting an appropriate model for different applications
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