R-T-B BASED PERMANENT MAGNET AND MOTOR

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To provide an R-T-B based permanent magnet which is high in both of a residual magnetic flux density Br at a room temperature and a coercive force HcJ at a high temperature.SOLUTION : An R-T-B based permanent magnet comprises R as a rare earth element, T of an iron group element, and B of boron, in which R includes a light rare earth element and a heavy rare earth element. The R-T-B based permanent magnet further comprises Al, Ga and Zr. To 100 mass% of the R-T-B based permanent magnet, the total content of R is 28.50-30.25 mass% (exclusive of 28.50 mass%), the content of B is 0.93-0.98 mass%, the content of Al is 0.03-0.19 mass%, the content of Ga is 0.03-0.15 mass%, and the content of Zr is 0.30-0.50 mass%.SELECTED DRAWING : Figure 1