Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing
T. Bulína,b, E. Švábenská c, M. Hapla c, Č. Ondrůšek a and O. Schneeweissb,c
aBrno University of Technology, Faculty of Electrical Engineering and Communication, Technická 3058/10, 616 00 Brno, Czech Republic
bCEITEC IPM, Institute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
cInstitute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
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Non-oriented electrical steel sheets are the most often used materials in electrical rotary machines. Raw sheets must be formatted by various methods, e.g., punching, laser, spark or water stream cutting. Basic parameters of magnetic, electrical, and mechanical properties of the sheets are usually obtained from the producer, but namely magnetic properties are changed in dependence on additional machining processes. The aim of this study is to describe changes in magnetic properties after punching, laser or spark cutting of the original sheets M470-50A. The basic information about the structure of the cut edges of samples was obtained by optical microscopy and scanning electron microscopy. For the magnetic measurements toroidal samples were prepared by the mentioned technologies. The magnetic parameters were yielded from the measuring of magnetic hysteresis loops in dependence on saturation fields. The results are discussed from the point of view of applied cutting methods with the aim to obtain the best magnetic parameters and consequently determining the depth of the influenced material. After laser cutting, important decrease in remanence and increase in total losses were observed in comparison with the punched samples.

DOI: 10.12693/APhysPolA.131.819
PACS numbers: 75.60.Ej, 75.20.En