Ferrite sintered magnet, motor, and method for producing the ferrite sintered magnet
View Patent ↗A ferrite sintered magnet has a surface roughness Rz of 3.5 μm or less. A method for producing a ferrite sintered magnet includes: mixing magnetic powders with at least a binder resin to obtain a magnetic powder mixture; injection molding the magnetic powder mixture inside of a mold having a surface roughness of a surface in contact with the magnetic powder mixture of 2.0 μm or less with a magnetic field applied to the mold, to obtain a molded body; and sintering the molded body.
1. A ferrite sintered magnet comprising an unground surface; wherein a surface roughness Rz of the unground surface is 3.5 μm or less.
2. The ferrite sintered magnet according to claim 1 , wherein the surface roughness Rz is less than 2.0 μm.
3. A motor using the ferrite sintered magnet according to claim 1 .
4. A motor using the ferrite sintered magnet according to claim 2 .
5. A method for producing a ferrite sintered magnet comprising:
mixing magnetic powders with at least a binder resin to obtain a magnetic powder mixture;
injection molding the magnetic powder mixture inside of a mold having a surface roughness Rz of a surface in contact with the magnetic powder mixture of 2.0 μm or less with a magnetic field applied to the mold, to obtain a molded body; and
sintering the molded body.