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

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PROBLEM TO BE SOLVED : To provide an R-T-B-based rare earth permanent magnet capable of attaining high coercive force (Hcj) without increasing a Dy concentration in R-T-B-based alloy, and capable of suppressing deterioration of a magnetization intensity (Br) caused by addition of Dy and attaining excellent magnetic properties. SOLUTION : An R-T-B-based rare earth permanent magnet consists of a sinter body including a main phase mainly containing R2Fe14B and a grain boundary phase containing more R than the main phase, where R denotes rare earth elements including Nd as an essential element. The sinter body includes Ga as an essential element. The grain boundary phase includes a first grain boundary phase, a second grain boundary phase and a third grain boundary phase which are different from one another in total atom concentration of the rare earth elements. The third grain boundary phase is lower than the first grain boundary phase and the second grain boundary phase in total atom concentration of the rare earth elements, and higher than the first grain boundary phase and the second grain boundary phase in atom concentration of Fe. COPYRIGHT : (C)2012, JPO&INPIT