Rotational magnetic loss in magnetic core materials has been examined with respect to the direction of rotation at high magnetic flux density by a newly developed two-dimensional magnetic measurement method. The rotational losses in clockwise or anticlockwise directions depend largely on inclination angle of magnetic filed sensing axis to orthogonal magnetic flux axes. The rotational loss changes first appear at 1.5 T in accordance to the decrease of phase difference between magnetic field H and magnetic flux density B.
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Mori et al. (2005) studied this question.