Method of magnetizing rare-earth magnet and rare-earth magnet

Details Method of magnetizing rare-earth magnet and rare-earth magnet Method of magnetizing rare-earth magnet and rare-earth magnet

2007-06-19

2007-06-19

Sheehan, John P. (Department: 1742)

Metal treatment

Stock

Magnetic

C148S103000, C148S108000, C335S297000, C335S302000, C029S602100

Reexamination Certificate

active

10485210

ABSTRACT:
The method of the present invention includes a step of preparing a rare earth magnet22disposed for forming a cylinder22a, a first magnetizing step of applying a first external magnetic field H1to the rare earth magnet22, thereby forming a first region R1magnetized from an inner side to an outer side of the cylinder22aand a second region R2magnetized from the outer side to the inner side, and a second magnetizing step of applying a second external magnetic field H2so that an external magnetic field component forming an angle of more than 0° and less than 50° with a direction of the external magnetic field component applied in the first magnetizing step to a boundary between the first region R1and the second region R2.

REFERENCES:
patent: 5383978 (1995-01-01), Yamamoto et al.
patent: 6153952 (2000-11-01), Ito et al.
patent: 6432158 (2002-08-01), Harada et al.
patent: 6448763 (2002-09-01), Spellman
patent: 62-149109 (1987-07-01), None
patent: 10-270247 (1998-10-01), None
patent: 2002-124414 (2002-04-01), None

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