Affiliations: Institute EMCE, TU Wien, Vienna, Austria
Correspondence:
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Corresponding author: Helmut Pfützner, Institute EMCE - Electrodynamics, University of Technology Vienna, Vienna, Austria. Tel.: +43 664 39 02 103; E-mail:pfutzner@tuwien.ac.at
Abstract: In contrast to clear under-estimations through
non-experts, modern transformers represent high-tech products of highest
economic value. This is also true for the soft magnetic core of a
transformer. It consists of highly grain oriented (HGO) silicon iron that is
surface-treated by stress coating and laser scribing, yielding domain
refinement through most intelligent physical mechanisms. Considering a
single individual core package, it reveals a complex 2-dimensional flux
distribution that is characterized by ``flux along rails'' due to the high
effective anisotropy of HGO materials. It impedes effective numerical
modelling since being linked with non-linearity, hysteresis and stress
effects from surface treatments. Experimental modelling faces problems of
scaling-down and from imperfect clamping, but it yields clear indications
for the existence of significant rotational magnetization that should be
restricted through further research. The core packages are in -
non-clarified - interaction to each other which means that a core has to be
considered as a 3D system. This complicates attempts of modelling in further
ways. However, high potential exists for further core improvements with
respect to lower building factor and lower audible noise. The challenge will
be to reduce both characteristics in synchronous ways.
