Temperature compensation of NdFeB permanent magnets

Author

Kim, S.H. ; Doose, C.

Author_Institution

Adv. Photon Source, Argonne Nat. Lab., IL, USA

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

3227

Abstract

Permanent magnet blocks of NdFeB have a relatively high maximum energy product. Because of its relatively low Curie temperature, however, NdFeB has a large temperature coefficient for its residual induction. The temperature coefficients of the relative magnetic fields (ΔB/B)/ΔT in the air gap of NdFeB dipole magnets were reduced from -1.1×10^-3/°C to less than 2×10 ^-5/°C under operating temperatures of ±6°C. This was achieved passively by using 1.25-mm-thick strips of 30%-Ni-Fe alloy as flux shunts for the NdFeB blocks. The magnets with soft-steel poles and flux-return yokes were assembled and measured in a temperature-controlled environment

Keywords

accelerator magnets; boron alloys; iron alloys; neodymium alloys; permanent magnets; storage rings; Curie temperature; NdFeB; NdFeB permanent magnets; flux-return yokes; operating temperatures; permanent magnet blocks; relative magnetic fields; residual induction; soft-steel poles; temperature compensation; temperature-controlled environment; Ferrites; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetization; Permanent magnets; Permeability; Strips; Temperature distribution; Temperature sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.753163

Filename

753163