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Barkhausen Noise in Grain-Oriented 3% Si-Fe AT 50 HZ

Chukwuchekwa, Nkwachukwu, Moses, Anthony John and Anderson, Philip Ian 2010. Barkhausen Noise in Grain-Oriented 3% Si-Fe AT 50 HZ. Journal of Electrical Engineering 61 (7/s) , pp. 69-72.

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Abstract

Barkhausen noise (BN) measurements were performed on samples of high permeability and conventional grain-oriented steels at both high and low flux densities in order to investigate the characteristics in each magnetization regimes. Previous works deal with measurements of Barkhausen noise carried out at high flux densities (0.2 T and above) but this work demonstrates that Barkhausen noise has different characteristics at low flux densities (8 mT to 0.2 T). The results show that the amplitude sum and the RMS Barkhausen signals are higher for High Permeability Grain-Oriented (HGO) steel than Conventional Grain-Oriented (CGO) steel at high flux densities because the grain size of HGO is higher than that of CGO. Domain wall spacing increases with increasing grain size. Hence increased grain size means domain walls move further between pinning sites resulting in larger BN signal. Below 0.2 T, the BN signal becomes higher for CGO steel. HGO samples were mechanically scribed on one surface transverse to the rolling direction. It was observed that scribing reduced the BN amplitude at high flux densities. This is due to the decrease of domain width by scribing. Then the trend reverses again at low flux density.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Barkhausen noise, grain-oriented steel, amplitude sum analysis, RMS analysis, grain size
Publisher: The Faculty of Electrical Engineering and Information Technology of the Slovak University of Technology, Bratislava and The Institute of Electrical Engineering of the Slovak Academy of Sciences, Bratislava
ISSN: 1335-3632
Last Modified: 04 Jun 2017 03:04
URI: http://orca-mwe.cf.ac.uk/id/eprint/16346

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