The use of domain observations in understanding and improving the magnetic properties of transformer steels

摘要: The observation of the domain pattern 3% grain-oriented silicon-iron (transformer steel) by Kerr magneto-optic effect has enabled a greater understanding basic magnetization processes this material to be obtained. In review paper, an attempt is made describe recent progress in field study. principal commercial criterion transformer steel power loss and therefore many attempts have been correlate observations with measured loss. increased knowledge shape per cycle against frequency characteristic shown that anomalous responsible for approximately 50% total Experimental results are described which attribute causes such as occurrence walls, wall angles configuration, variation spacing lamination thickness, non-uniform non-repetitive motion (pinning), grain size effects, lack flux penetration (wall bowing) nucleation. addition, experimental explain optimum thickness minimum applied stress.