| 简介 |
PROBLEM TO BE SOLVED : To provide a magnet that is free from decrease in residual magnetic flux density of a permanent magnet suitable for a permanent magnet rotating machine and, has high-coercive force.
SOLUTION : In the permanent magnet rotating machine, a rotor with a plurality of permanent magnet segments attached to a side of a rotor core, and a stator with a winding wound around a stator core having a plurality of slots, are arranged via a void. An edge of the permanent magnet is thinner than a central part. The permanent magnet is a sintered magnet composed of an R1-Fe-B composition. While powder, which is selected from an oxide of R2, a fluoride of R3, an acid fluoride of R4 (wherein, R1, R2, R3, and R4 are rare-earth elements), exists on a surface of the magnet, heat treatment is applied to the magnet and the powder at a sintering temperature of the magnet or below in a vacuum or in inert gas. The coercive force at the edge of the permanent magnet is higher than that at the central part in the method of manufacturing the permanent magnet segment for the permanent magnet rotating machine.
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