Patent ID: 7531933

Claim:
A permanent magnet rotating machine comprising: a rotor including a rotor core and a plurality of permanent magnet segments attached to the side surface of the rotor core; and a stator surrounding the rotor to define a gap therebetween and including a stator core having a plurality of slots and windings received in the slots, wherein said permanent magnet segments each have a cross-sectional shape including a central portion having a first thickness and transversely opposed end portions having a second thickness which is less than the first thickness, said permanent magnet segments include a sintered magnet body of R 1 —Fe—B composition wherein R 1 is at least one element selected from rare earth elements inclusive of Y and Sc, an absorbed powder comprising at least one compound selected from the group consisting of an oxide of R 2 , a fluoride of R 3 , and an oxyfluoride of R 4 wherein each of R 7 , R 3 , and R 4 is at least one element selected from rare earth elements inclusive of Y and Sc, and a higher coercive force at the transversely opposed end portions than at the central portion.