PERMANENT MAGNET ROTATING MACHINE

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In a rotating machine comprising a rotor including a rotor core and a plurality of permanent magnet segments, and a stator including a stator core and windings, the permanent magnet segment is obtained by disposing a powder comprising an R 2 oxide, R 3 fluoride or R 4 oxyfluoride on a sintered magnet body of R 1 -Fe-B composition, wherein R 1 to R 4 are rare earth elements, and heat treating the powder-covered magnet body. The permanent magnet segment of a cross-sectional shape which is tapered from the center toward opposed ends has a higher coercive force at the ends than at the center.