Influence of scratching on domain structure and power loss in amorphous ribbons

Abstract

Static domain observations were performed not only on polished and annealed samples but also on scratched samples with different scratching intervals by using the Kerr effect technique. The domain observations and loss measurements were carried out on 2605SC amorphous ribbon under 20 MPa tension to emulate a typical condition in a 100 kVA transformer. Loss measurements were carried out using the initial rate of rise of temperature technique over a frequency range of 50 to 400 Hz at flux densities from 0.8 to 1.4 Tesla. The transverse scratching of the sample surface was very effective on decreasing domain wall spacing. The anomaly factor was also found to alter due to changes in the domain wall spacing. A scratching interval of 3 mm was found to be the optimum for maximum energy saving on surface treated amorphous ribbons. © 1994, American Institute of Physics