Magnetic bearings using bulk superconductors as a field shaping material

Author

Ohsaki, Hiroyuki ; Nozawa, Natsuki ; Kubo, Yoji

Author_Institution

Dept. of Adv. Energy, Tokyo Univ., Japan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1669

Lastpage

1672

Abstract

Magnetic bearings have been studied that use bulk superconductors as a field shaping material and need only a steel component on the rotor side. Two bearing configurations are considered: the bulk magnet type and the mixed-μ type. In both systems, stable levitation of the steel rotor has been demonstrated. Electromagnetic force measurements have shown that the mixed-μ type has better vertical force characteristics and similar radial force characteristics to the bulk magnet type. Rotation tests have been also carried out, which indicate that eddy current loss in the steel rotor is dominant and a larger loss was observed in the mixed-μ type

Keywords

eddy current losses; electromagnetic forces; machine bearings; machine testing; magnetic bearings; rotors; superconducting machines; superconducting magnets; bearing configurations; bulk superconductors; eddy current loss; electric machine magnetic bearings; electromagnetic force measurements; field shaping material; levitation stability; radial force characteristics; rotation tests; rotor side steel component; vertical force characteristics; Building materials; Electromagnetic forces; Force measurement; Magnetic field measurement; Magnetic levitation; Magnetic materials; Steel; Superconducting magnets; Superconducting materials; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920102

Filename

920102