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Magnetic properties of non‐oriented magnetic steel at medium frequencies
Author(s) -
Lex Albert,
Huneus Hans
Publication year - 1990
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199000415
Subject(s) - eddy current , materials science , magnetic field , field strength , power loss , square (algebra) , electrical resistivity and conductivity , hysteresis , copper , condensed matter physics , composite material , nuclear magnetic resonance , metallurgy , electrical engineering , power (physics) , physics , engineering , mathematics , thermodynamics , geometry , quantum mechanics
The magnetic properties of non‐oriented magnetic steel are specified at a frequency of 50 or 60 Hz. The effect of increasing the frequency of the magnetizing field upon the specific total loss, the field strength and the specific apparent power is demonstrated. Regarding the non‐oriented steel at 50 Hz total loss comprises mainly hysteresis loss, whereas the eddy‐current loss of most of the grades amounts to less than 40%. The approximately square increase of the eddy‐current loss with frequency means that at 400 Hz the total loss is determined by the resistivity. For excitations up to a peak polarization of 1.6 T increasing sheet thickness results in an increasing field strength at 400 Hz. While at 50 Hz low‐alloyed grades have a lower field strength above 1.3 T, at 400 Hz the field strength of the high‐alloyed grades is more favourable up to 1.4 T. With respect to the apparent power, the square of which is proportional to the copper losses, there is an advantage of the higher alloyed grades up to 1.5 T.