R-T-B-BASED RARE EARTH PERMANENT MAGNET, MOTOR, VEHICLE, GENERATOR AND WIND POWER GENERATOR

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PROBLEM TO BE SOLVED : To provide a R-T-B-based rare earth permanent magnet that can provide a high coercive force (Hcj) without enhancing the Dy concentration in R-T-B-based alloy and can suppress the decline in magnetization (Br) caused by addition of Dy so as to provide an excellent magnetic characteristic. SOLUTION : A R-T-B-based rare earth permanent magnet comprises a sintered body having a main phase including mainly R2Fe14B, and a grain boundary phase including more R than the main phase, and R represents a rare earth element including Nd and Dy as the essential element, and the grain boundary phase includes a first grain boundary phase and a second grain boundary phase with different Dy atom concentrations. COPYRIGHT : (C)2012, JPO&INPIT