| 简介 |
PROBLEM TO BE SOLVED : To provide an annular and circular anisotropic rare earth/iron-based bond magnet which has a static magnetic field strong to an air gap for high output and high efficiency of a permanent magnet type motor, and which has superior demagnetization yield strength under high temperature exposure.
SOLUTION : A rare earth/iron-based magnet powder [A1] is made by mixing a rare earth/iron-based magnet powder [A1a] having an aggregate structure of recrystalized particles made of R2Fe14B tetragonal phase of which diameter of unavoidable particle for manufacturing is 53 μm or less, and a single-domain particle type Sm2Fe17N3 rare earth/iron-based magnet powder [A1b] of which average particle diameter is 3 μm or less, at a ratio of 60-0 : 40-100 (wt%), and it is compressed and molded together with a binder [B] at 50 MPa or less. Furthermore, the coercive force HCJ of [A1a] is set to 0.90-1.05 MA/m, (BH)max thereof is set to 300 kJ/m3 or more and oxygen quantity is set to 0.3 wt% or less, thus making a more appropriate anisotropic rare earth/iron-based bond magnet.
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