R-T-B-BASED PERMANENT MAGNET AND ROTARY MACHINE

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PROBLEM TO BE SOLVED : To provide an R-T-B-based permanent magnet, which is suitable as a magnet of a variable magnetic force for a variable-magnetic flux motor and has a high residual magnetic flux density and a low coercive force, and of which the magnetic force can be reversibly changed by a small external magnetic field. SOLUTION : An R-T-B-based permanent magnet comprises : rare earth elements R, of which a predetermined amount consists of at least one rare earth element selected from Y, La and Ce; and at least one of Al, Cu, Zr, Hf and Ti, which is added as an additive element. Thus, a permanent magnet suitable as a variable magnet for a variable-magnetic flux motor, and having a high residual magnetic flux density and a low coercive force can be obtained. COPYRIGHT : (C)2016, JPO&INPIT