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Composite Bonded Magnets With Self-Recoverability for Miniaturized Anisotropic Magnet Rotor

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Title: Composite Bonded Magnets With Self-Recoverability <newline/>for Miniaturized Anisotropic Magnet Rotor
Authors: Yamashita, Fumitoshi / Yamada, Osamu / Ohya, Shiho / Kobayashi, Osamu / Nakano, Masaki / Fukunaga, Hirotoshi
Issue Date: Jun-2010
Publisher: IEEE
Citation: IEEE Transactions on Magnetics, 46(6), pp.1978-1981; 2010
Abstract: In the preparation of a miniaturized rotor, a composite bonded magnet was fabricated by taking advantage of self-recoverability. A preformed magnet was synthesized by using incomplete three-dimensional network molecular structure which was formed under the optimum conditions at a temperature of 433 K, an alignment field of 1.4 MA/m, and a low compacting pressure of 50 MPa, respectively. The preformed ones were extruded and compressed into a ring-shaped magnet by using the self-recoverability at a pressure of 200 MPa and a temperature of 423 K under non-alignment-field. Through the process, a composite bonded magnet rotor in the shape of a ring could be prepared without a bonding layer. It was clarified that a 4 pole/6 slot DC brush less motor can be obtained by using the ring-shaped rotor comprising a parallel oriented anisotropic magnet with 7 mm in outer diameter, 158 kJ/m3 in (BH)max, and 6.2 Mg/m3 in density, respectively. Resultantly, the developed rotor enabled us to increase the S-T gradient by 1.75 times compared with that for a conventional isotropic Nd-Fe-B bonded magnet rotor with the same dimensions.
Keywords: Anisotropic bonded magnet rotor / Anisotropic rare earth bonded magnet / DC brushless motor / Self-recoverable binder system
URI: http://hdl.handle.net/10069/23267
ISSN: 00189464
DOI: 10.1109/TMAG.2010.2041050
Rights: © 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/23267

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