Relationship between total losses under tensile stress in 3 percent Si-Fe single crystals and their orientations near

“…Domain structures are commonly characterized statically with surface sensitive techniques such as magneto-optical Kerr microscopy 2 . As transformers are operated at frequencies of power networks the analysis of their surface domains is done with dynamic observation techniques like excitation/scanning synchronization 3 and sampling stroboscopy 4 . Information about domain wall motion, wall spacing, bowing, nucleation and domain refinement of GOES at power frequencies are reported in 5 where stroboscopic and even real time experiments are reported all together using light-based Kerr microscopy techniques.…”

Section: Introductionmentioning

confidence: 99%

Dynamic volume magnetic domain wall imaging in grain oriented electrical steel at power frequencies with accumulative high-frame rate neutron dark-field imaging

Harti

Ströbl

Schäfer

et al. 2018

Sci Rep

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The mobility of magnetic domains forms the link between the basic physical properties of a magnetic material and its global characteristics such as permeability and saturation field. Most commonly, surface domain structure are studied using magneto-optical Kerr microscopy. The limited information depth of approx. 20 nanometers, however, allows only for an indirect interpretation of the internal volume domain structures. Here we show how accumulative high-frame rate dynamic neutron dark-field imaging is able for the first time to visualize the dynamic of the volume magnetic domain structures in grain oriented electrical steel laminations at power frequencies. In particular we studied the volume domain structures with a spatial resolution of ∼100 μm and successfully quantified domain sizes, wall velocities, domain annihilation and its duration and domain wall multiplication in real time recordings at power frequencies of 10, 25 and 50 Hz with ±262.5 A/m and ±525 A/m (peak to peak) applied field.

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“…To reduce the core loss of grain oriented silicon steel, various metallurgical attempts have been made, good orientation, small grain size, tensile coating and so on [1,2]. The ball point pen and laser scribing reduce the core loss of 3% Si-Fe [3 -6], because sub-domains induced by scribing produce many active domain walls which reduce the eddy current loss.…”

Section: Introductionmentioning

confidence: 99%

Core loss reduction by laser scribing in grain-oriented 3% Si-Fe under different magnetizing direction

Ryu

Park

Kim

et al. 2004

phys. stat. sol. (a)

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PACS 75.50.Bb, 75.60.Ej To reduce the core loss of grain oriented silicon steel, various metallurgical attempts have been made. The laser scribing reduces the core loss of 3% Si -Fe, because sub-domains induced by scribing produce many active domain walls which reduce the eddy current loss. The profiles of ac hysteresis loop and core loss have been measured for samples oriented parallel and perpendicular to the [001] axis in (110)[001] grains of 3% Si -Fe before and after laser scribing. The observed ac hysteresis loop profiles have been analyzed in terms of domain reorientation under field. For the parallel and perpendicular samples, the reductions of core loss are 5.7% and 30.3% by laser scribing at the magnetic induction 1.3 T and magnetizing frequency 60 Hz.

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Relationship between total losses under tensile stress in 3 percent Si-Fe single crystals and their orientations near

Cited by 82 publications

References 12 publications

The Relationship between Primary and Secondary Recrystallization Texture of Grain Oriented Silicon Steel

The Relationship between Primary and Secondary Recrystallization Texture of Grain Oriented Silicon Steel

Dynamic volume magnetic domain wall imaging in grain oriented electrical steel at power frequencies with accumulative high-frame rate neutron dark-field imaging

Core loss reduction by laser scribing in grain-oriented 3% Si-Fe under different magnetizing direction

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