Melt textured YBCO samples for trapped field magnets and levitating bearings

Author

Fuchs, G. ; Stoye, P. ; Staiger, T. ; Krabbes, G. ; Schatzle, P. ; Gawalek, W. ; Gornert, P. ; Gladun, A.

Author_Institution

Inst. fur Festerkorper- und Werkstofforschung, Dresden, Germany

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1949

Lastpage

1952

Abstract

Bulk melt textured YBCO materials in the shape of disks are being developed for use as trapped field magnets and in superconducting bearings. The trapped field in the gap between two disks of 26 mm in diameter reached maximum values of 1 T at 77 K and of 8.5 T at 51.5 K. A superconducting magnetic bearing has been built up of two YBCO rings and two concentric NdFeB ring magnets between them. A static levitation force of 25 N and values of the axial and radial stiffnesses of 15 N/mm and 10 N/mm, respectively, have been achieved for this bearing in the working position. A high speed motor with two superconducting magnetic bearings of this kind has been tested at 77 K.

Keywords

barium compounds; flux pinning; high-temperature superconductors; induction motors; machine bearings; magnetic levitation; superconducting machines; superconducting magnets; yttrium compounds; 1 T; 26 mm; 51.5 K; 77 K; 8.5 T; NdFeB; NdFeB ring magnets; YBCO rings; YBa/sub 2/Cu/sub 3/O/sub 7/; asynchronous motor; axial stiffness; disks; high speed motor; levitating bearings; melt textured YBCO samples; radial stiffness; static levitation force; superconducting bearings; superconducting magnetic bearing; superconducting magnetic bearings; trapped field; trapped field magnets; Magnetic field measurement; Magnetic levitation; Magnetic materials; Persistent currents; Shape; Superconducting magnets; Superconducting materials; Temperature sensors; Testing; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.620968

Filename

620968