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Effects of external stress on magnetic properties in motor cores
Author(s) -
Yamamoto KenIchi,
Shimomura Eiji,
Yamada Kazuo,
Sasaki Tadashi
Publication year - 1998
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19980415)123:1<15::aid-eej3>3.0.co;2-r
Subject(s) - magnetostriction , materials science , permeability (electromagnetism) , inverse magnetostrictive effect , stress (linguistics) , compressive strength , relative permeability , magnetic core , magnetic field , composite material , condensed matter physics , magnetic energy , nuclear magnetic resonance , magnetization , electrical engineering , physics , engineering , electromagnetic coil , chemistry , biochemistry , linguistics , philosophy , quantum mechanics , membrane , porosity
The effects of shrink fitting on the magnetic properties of iron cores are investigated in order to simulate the magnetic behavior of iron cores mounted in motor frames. Shrink fittings, of course, decrease permeability and increase effective magnetostriction and magnetic loss. It is well known that the magnetostriction increment and the permeability decrement are explained by the increase of magnetoelastic energy due to compressive stress by shrink fitting. The magnetic loss increases, however, cannot be explained by this energy. We demonstrate experimentally that the magnetic loss increases result from mechanical work due to the magnetostrictive movement of the iron core under compressive stress. © 1998 Scripta Technica, Electr Eng Jpn, 123(1): 15–22, 1998