Abstract
This paper proposes an advanced approach to construct static hysteresis loop of Grain-Oriented (GO) electrical steels for dynamic modeling and energy loss analysis. The proposed approach is in line with the magnetic hysteresis and phenomenological concepts of rate-dependent and rate-independent energy loss components of ferromagnetic materials under time-varying magnetic fields. The proposed method can predominantly describe energy loss mechanism and magnetization processes of the material. Accuracy of this technique was validated on Epstein size laminations of 3% GO silicon steels. The results explicitly confirmed the effectiveness of the proposed method in dynamic hysteresis modeling of GO electrical steels at magnetizing frequencies up to 1 kHz and peak flux densities up to 1.7 T.
Highlights
Electrical steels are the most important soft magnetic materials in industry
This paper aims to perform dynamic modeling of GO steels based on the Thin Sheet Model (TSM) with an advanced approach to construct the static hysteresis loop (SHL)
Total energy loss calculated from the constructed SHL is 80.25 J/m3, while the total energy loss calculated from the measured dynamic hysteresis loop (DHL) at frequencies of 5 and 10 Hz are 104.14 and 114.47 J/m3 per cycle, respectively. These results explicitly show that low frequency hysteresis loops cannot be used as quasi-static hysteresis loop, and they may result in significant uncertainty in dynamic modeling of GO steels and energy loss separation
Summary
Electrical steels are the most important soft magnetic materials in industry. They are widely used as the core materials of the rotating machines, power transformers, and other electromagnetic devices installed in the electric networks and power systems. Relative permeability and total energy loss in J/m3 per cycle or specific power loss in W/kg are two determinant parameters to characterize electrical steels for the range of magnetizations These parameters can be effectively obtained by monitoring magnetization processes and dynamic hysteresis loop (DHL) of the material. A comprehensive analysis on the dynamic behavior of the magnetic materials over a range of flux density, at a particular frequency, can provide useful information about the magnetization processes, energy loss, and its components. This leads to a new insight to analyze the magnetization processes of GO electrical steels. Accuracy of the proposed approach was validated for Epstein size strips of GO 3% SiFe material at magnetizing frequencies of 50 Hz–1 kHz and peak flux densities of 1.1–1.7 T
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