Abstract
The influence of winding-induced mechanical stresses on the magnetic anisotropy and core loss in toroidal cores made of Fe73Cu1Nb3Si16B7 ribbon is studied. The ribbon for the cores was rapidly pre-heated under tensile stress up to 120 MPa. It was found that magnetic characteristics of the material (magnetic anisotropy energy and the core loss) can be controlled by varying the tensile stress during the preliminary rapid heating of the ribbon. It was shown that with reducing core diameter, the magnetic anisotropy energy and core loss significantly increase. However, relatively high winding-induced core loss in small cores can be significantly reduced by increasing tensile stresses applied to the ribbon during pre-heating.
Highlights
IntroductionSoft magnetic nanocrystalline alloys of Fe– Nb–Cu–B–Si system [1] are widely used in magnetic cores of various inductive components (transformers or chokes)
Nowadays, soft magnetic nanocrystalline alloys of Fe– Nb–Cu–B–Si system [1] are widely used in magnetic cores of various inductive components
Nosenko et al Nanoscale Research Letters (2017) 12:299 transverse magnetic anisotropy in the ribbons, the rapid heating is done under tensile stress σt = 0, 35, 80, and 120 MPa
Summary
Soft magnetic nanocrystalline alloys of Fe– Nb–Cu–B–Si system [1] are widely used in magnetic cores of various inductive components (transformers or chokes). It is known that formation of α–Fe(Si) nanocrystals in these alloys during heat treatment improves their soft magnetic properties. Volume fraction of nanocrystals in these materials is 75–80% and their size is about 10 nm [1]. The so-called linear hysteresis loop can be obtained in these types of alloys by inducing uniaxial transverse magnetic anisotropy during annealing under tensile stress [2, 3]. Magnetic structure of such type alloys was studied in details by the authors of [4]. In [5], huge magnetic anisotropy was reported for the ribbons of this type
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