Establishment of Multipole Magnetizing Method and Apparatus Using a Heating System for Nd-Fe-B Isotropic Bonded Magnets

Author

Komura, Haruhiro ; Kitaoka, Mikio ; Kiyomiya, Teruo ; Matsuo, Yoshio

Author_Institution

R&D, FDK Corp., Kosai

Volume

44

Issue

11

fYear

2008

Firstpage

4266

Lastpage

4268

Abstract

To contribute to the size reduction of electromagnetic devices, a multipole magnetizing method for Nd-Fe-B isotropic bonded magnets using a heating system without any magnetizing power supply was examined. After rapidly heating above their Curie temperature, the magnets are magnetized during cooling in the presence of a magnetic field generated by a set of Sm-Co permanent magnets. The level of magnetization can be tailored by variation of the final temperature to which the magnets are cooled in the presence of the magnetic field. Due to the heating process, the magnets show excellent thermal stability.

Keywords

Curie temperature; boron alloys; electromagnetic devices; iron alloys; magnetic field effects; magnetisation; neodymium alloys; permanent magnets; stepping motors; thermal stability; Curie temperature; NdFeB; electromagnetic devices; heating system; isotropic bonded magnets; magnetic field; magnetization; magnetizing power supply; multipole magnetizing method; permanent magnets; size reduction; stepper motor; thermal stability; Curie point; Nd-Fe-B; electromagnetic device; multipole magnetizing; stepper motor; thermal demagnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2001488

Filename

4717439