| 简介 |
PROBLEM TO BE SOLVED : To provide a circular rare earth permanent magnet in the shape which can be formed under high pressure using magnetic powder of SmCo system, NdFeB system, and the like to obtain high magnetic property, and the method of forming the same.
SOLUTION : In a circular rare earth permanent magnet 1 having an inner periphery surface 3 and an outer periphery surface 2, the outer periphery surface 2 has a circular surface 2a on the center portion and a surface 2b which is positioned on both sides of the circular surface 2a and is different from the circular surface 2a in curvature. The surface 2b and the end portion of the outer periphery surface are positioned on the circumference extended with curvature radius of the circular surface 2a on the center portion or the inner side of this circumference. Further, the end portion of the outer periphery surface 2 is a flat surface 2c in parallel in outline with a tangent of the midpoint of the outer periphery. |
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