PERMANENT MAGNET MOTOR

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PROBLEM TO BE SOLVED : To minimize the use of a heavy rare earth element by optimizing the use of the heavy rare earth element, and thereby to suppress the cost. SOLUTION : A permanent magnet motor comprises : a rotor having a permanent magnet embedded in a rotor core 100; and a stator arranged to face the rotor via a predetermined gap. The permanent magnet is a plurality of sintered magnet segments 10a and 10b obtained by dividing a sintered magnet 10, which is made by segregating a heavy rare earth element at a crystal grain boundary near a surface of the magnet 10, along a face perpendicular to a magnetization direction. The plurality of sintered magnet segments 10a and 10b is embedded in the rotor core 100 in such a manner that a surface having a relatively high concentration of the heavy rare earth element is arranged on an outer peripheral surface side of the rotor. COPYRIGHT : (C)2012, JPO&INPIT