| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth sintered magnet that can generate magnetic flux having practically useful surface magnetic flux density only on one surface in a thickness direction without increasing the size or weight of a magnet unit.
SOLUTION : A rare earth sintered magnet contains rare earth material, and has a constitution that a large number of magnet material particles each of which has an axis of easy magnetization are integrally sintered. The magnet comprises a first surface 11 and a second surface 12 facing each other in a thickness direction β, and within a plane parallel with a width direction α and the thickness direction β, the magnet material particles are magnetized such that an orientation direction of the axis of easy magnetization gradually changes within a range directed from each of both ends 13a, 13b in the width direction α to a central part 13c of the width direction α. The maximum surface magnetic flux density D1 on the first surface 11 and the maximum surface magnetic flux density D2 on the second surface 12 satisfy the relationship of (D1/D2)≥4. The orientation direction of the axis of easy magnetization may be different by 90°±5° or 180°±5° between each of both ends in the width direction and the central part in the width direction.
SELECTED DRAWING : Figure 1
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