Development of dy-free NdFeB anisotropic bonded magnet (New MAGFINE)

Author

Noguchi, Kenji ; Mishima, Chisato ; Yamazaki, Masao ; Matsuoka, Hiroshi ; Mitarai, Hironari ; Honkura, Yoshinobu

Author_Institution

Aichi Steel Corp., Tokai, Japan

fYear

2011

fDate

28-29 Sept. 2011

Firstpage

181

Lastpage

186

Abstract

The authors have successfully developed a low-cost anisotropic NdFeB magnet powder with high coercivity value of 18kOe without any Dy additives by diffusion processing of Nd-Cu-Al element to anisotropic magnet powder produced by the d-HDDR method. This enhancement mechanism is to isolate the magnetic couple between grain of Nd₂Fe₁₄B phase by creation of non-magnetic grain boundaries of Nd and Cu. By surface coating on this anisotropic magnet powder, the long-term aging loss behavior under air at 150deg.C has been improved by 6% after 1,000hr compared to current MAGFINE material without powder surface coating. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.

Keywords

aluminium; coatings; copper; electric motors; iron compounds; magnetic particles; magnets; neodymium compounds; small electric machines; thermal stability; Dy additives; MAGFINE material; Nd-Cu-Al; NdFeB; d-HDDR method; diffusion processing; dy-free NdFeB anisotropic bonded magnet powder; nonmagnetic grain boundary; powder surface coating; small automotive motors; thermal stability; time 1000 hr; Coercive force; Magnetic flux; Metals; Perpendicular magnetic anisotropy; Powders; Saturation magnetization; Anisotorpic bonded magnet; Dy-free; d-HDDR method; high stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Drives Production Conference (EDPC), 2011 1st International

Conference_Location

Nuremberg

Print_ISBN

978-1-4577-1371-2

Type

conf

DOI

10.1109/EDPC.2011.6085539

Filename

6085539