Physical Assessment of the Magnetic Path Length of Energy Loss Testers

Magnetic energy losses of SiFe sheets are determined by the standardized methods of single sheet tester (SST) or Epstein tester (ET). According to IEC standards, the total power consumption is measured in Watt-metric ways, and the portion that concerns the homogeneously magnetized region(s) is estim...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2020-12, Vol.56 (12), p.1-7
Main Authors: Pfutzner, Helmut, Shilyashki, Georgi, Huber, Emanuel
Format: Article
Language:English
Subjects:
Energy dissipation
Epstein tester (ET)
Field strength
Flyback transformers
Length measurement
Magnetic circuits
Magnetic field measurement
Magnetic fields
Magnetic flux
magnetic losses
magnetic path length (PL)
Magnetism
Magnetization
Power consumption
silicon iron
single sheet tester (SST)
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Summary:Magnetic energy losses of SiFe sheets are determined by the standardized methods of single sheet tester (SST) or Epstein tester (ET). According to IEC standards, the total power consumption is measured in Watt-metric ways, and the portion that concerns the homogeneously magnetized region(s) is estimated on a nominal value l_{m} of the so-called conventional effective magnetic path length (PL). A clear definition of PL is lacking-a suggestion being provided here. Standards express l_{m} through the dependence between the magnetic field strength H and the magnetization current. However, they apply the same value l_{m} also for the determination of losses P . From the viewpoint of physics, two PL quantities l_{m},_{H} and l_{m},_{P} would be preferable. The problematic is enhanced by the fact that the flux distribution within the magnetic circuit of a tester may change dynamically during the period of time, with induction changes B(t) . This means that the physical PL L is a function of time, according to a PL function L [ B(t) ]. Finally, dynamic changes in flux distributions prove to be distinctly influenced by hysteretic mechanisms which means that L [ B(t) ] exhibits loop character. The resulting complexity indicates that the concept of PL is not promising, if high accuracy of testing is demanded. However, for purposes of material comparisons, optimum PL values L_{\mathrm {OPT}} may be suitable that are determined for individual material families. Analyses of i
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2020.3025041