RARE EARTH PERMANENT MAGNET, ITS MANUFACTURING METHOD, AND PERMANENT MAGNET ROTARY MACHINE

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PROBLEM TO BE SOLVED : To provide R-Fe-B system sintered magnet with a small eddy current, a high residual magnetic flux density, and a high coercive force which is suitable for a permanent magnet rotary machine, and to provide the permanent magnet rotary machine using this magnet. SOLUTION : A method of manufacturing a rare earth permanent magnet comprises the steps of providing a plurality of slits on at least one front surface of a sintered magnet body consisting of R1-Fe-B system composition (R1is one sort or two sorts or more chosen from rare earth elements containing Y and Sc); and carrying out a heat treatment of the magnet body and powder at a temperature below a sintering temperature of the magnet in vacuum or in an inert gas, in the state where there exists the powder containing one sort or two sorts or more chosen from an oxide of R2, a fluoride of R3, and an oxyfluoride of R4(R2, R3and R4are one sort or two sorts or more chosen from the rare elements containing Y and Sc) on a front surface of the magnet body. COPYRIGHT : (C)2007, JPO&INPIT