Title :
Measurement of dynamic magnetostriction under rotating magnetic field
Author :
Enokizono, Y. ; Suzuki, T. ; Sievert, J.D.
Author_Institution :
Fac. of Eng., Oita Univ., Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
Rotational dynamic magnetostriction was measured as a function of rotating magnetic flux density on nonoriented and grain-oriented silicon steel sheets under various magnetization conditions. Rotational dynamic magnetostriction was measured by using a special strain gage which provides x- and y-direction output. Rotational magnetostriction is shown to be considerably larger than conventional alternating magnetostriction along the rolling direction because rotational dynamic magnetostriction is generated by the appearance and disappearance of 90° magnetic domain walls under the rotating flux density. The results obtained explain why the cores of rotating machines and three-phase transformers show larger magnetostriction than that predicted by rolling direction measurements of single-strip sheets under alternating flux
Keywords :
ferromagnetic properties of substances; iron alloys; magnetic domain walls; magnetic flux; magnetic variables measurement; magnetostriction; silicon alloys; Fe-Si; grain oriented Si steel sheets; magnetic domain walls; nonoriented sheet; rolling direction measurements; rotating machine cores; rotating magnetic flux density; rotational dynamic magnetostriction measurement; single-strip sheets; strain gage; three-phase transformers; Density measurement; Magnetic field induced strain; Magnetic flux; Magnetic flux density; Magnetization; Magnetostriction; Rotation measurement; Silicon; Steel; Strain measurement;
Journal_Title :
Magnetics, IEEE Transactions on
