Core Loss in Toroidal Cores Based on Fe-Based Amorphous Metglas 2605HB1 Alloy

Amorphous ribbon exhibits low power loss. However, core loss of amorphous ribbon based toroidal cores is about twice as large as that of the ribbon even after field annealing under an optimum condition. In the present work, effects of residual strain and inter-laminar eddy-current loss on loss incre...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2011-10, Vol.47 (10), p.3460-3462
Main Authors: Azuma, Daichi, Hasegawa, Ryusuke
Format: Article
Language:English
Subjects:
Amorphous materials
Annealing
Core loss
Cross-disciplinary physics: materials science
rheology
eddy currents
Exact sciences and technology
Loss measurement
magnetic cores
Materials science
Other topics in materials science
Physics
Resistance
Strain
Transformer cores
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Summary:Amorphous ribbon exhibits low power loss. However, core loss of amorphous ribbon based toroidal cores is about twice as large as that of the ribbon even after field annealing under an optimum condition. In the present work, effects of residual strain and inter-laminar eddy-current loss on loss increase were examined for toroidal cores based on recently developed Metglas 2605 HB1 alloy which has a high saturation induction B s of 1.64 T. The results show that: 1) with increase in residual strain, core loss and hysteresis loss are increased and no significant change in excess eddy-current loss was observed, and 2) there is no significant difference for frequency dependence of eddy-current loss by varying packing factor from 83% to 87%. This implies that there is no loss increase due to inter-laminar eddy current.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2011.2152370