MANUFACTURING METHOD OF POLAR ANISOTROPY RARE EARTH BOND MAGNET AND PERMANENT MAGNET MOTOR

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PROBLEM TO BE SOLVED : To provide a magnet which brings surface magnet flux density distribution of a magnet close to a sine wave shape while maintaining high maximum energy product (BH) max and whose irreversible demagnetization is less for its coercive force, and also to provide a permanent magnet motor using it. SOLUTION : A molding cavity wherein a permanent magnet is an orientation magnetic field generation source is charged with a granular compound which is mainly composed of rare earth magnet powder. The granule is softened and collapsed by heat and magnet, and is subjected to compression and molding at a low pressure of a pressure axial direction projection area of 15 to 50 MPa of the molding cavity while orientating it at least in a vertical direction to a surface and a surface direction, thus manufacturing the polar anisotropy rare earth bond magnet. COPYRIGHT : (C)2006, JPO&NCIPI