Temperature coefficients of rare earth permanent magnets

Author

Liu, Sam ; Kuhl, G. Edward

Author_Institution

Magnetics Lab., Dayton Univ., OH, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3271

Lastpage

3273

Abstract

A new approach for calculating the temperature coefficients of magnetic parameters is proposed in order to more accurately describe high temperature characteristics of magnetic materials. Using this new approach, the “true” (or instantaneous) temperature coefficient of any magnetic parameter at a specific temperature can be determined and a plot of temperature coefficient vs. temperature can be obtained. This new type of plot is a very useful tool to present temperature characteristics of a magnetic parameter. Data of temperature coefficient as a function of temperature for magnetization, intrinsic coercivity and maximum energy product are given for several types of rare earth permanent magnets. By applying the same approach, the temperature coefficients of heavy rare earth substituted magnets are calculated for (Sm_1-xGd_x)Co₅ and (Sm _1-xGd_x)₂TM₁₇ systems with 0⩽x⩽1

Keywords

coercive force; magnetisation; permanent magnets; rare earth alloys; (Sm_1-xGd_x)₂TM₁₇; (Sm_1-xGd_x)Co₅; (SmGd)Co₅; heavy rare earth substituted magnets; high temperature characteristics; intrinsic coercivity; magnetic materials; magnetic parameters; magnetization; maximum energy product; rare earth permanent magnets; temperature coefficients; temperature dependence; Coercive force; Contracts; Least squares methods; Magnetic field measurement; Magnetization; Permanent magnets; Polynomials; Pulse measurements; Temperature dependence; Temperature sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800495

Filename

800495