The considerable development effort of HTS magnetic bearings with respect to heavy loads is demonstrated. Radial type 200 mm bearing in an optimized design was developed for implementation in a new 5 kWh superconducting flywheel energy storage system. A prototype bearing, consisting of a modular assembled melt textured YBCO bulk 200 mm hollow cylinder with permanent magnet rotor is presented. Axial rotor displacement causes pinning forces of 8 and 10 kN axially at a temperature of 78 K and 71 K, respectively. Maximum radial forces are 4.7 kN at sub- cooled LN2. Fabrication technology incorporates the construction and engineering of a low-weight, nonmagnetic G-10 bearing cryostat. Ultra-low heat transfer structural elements were designed and constructed to reduce the thermal loss through the support to less than 2 Watt under 1 ton load.
[1]
Aaas News,et al.
Book Reviews
,
1893,
Buffalo Medical and Surgical Journal.
[2]
T. Riedel,et al.
A Compact HTS 5 kWh/250 kW Flywheel Energy Storage System
,
2007,
IEEE Transactions on Applied Superconductivity.
[3]
Masato Murakami,et al.
Application of superconducting magnetic bearings to a 10 kWh-class flywheel energy storage system
,
2005
.
[4]
W. Nick,et al.
Progress toward 500 kg HTS bearings
,
2003
.
[5]
T. Riedel,et al.
Encapsulated HTS bearings: technical and cost considerations
,
2005,
IEEE Transactions on Applied Superconductivity.
[6]
Andrew G. Glen,et al.
APPL
,
2001
.
[7]
A. C. Day,et al.
Temperature and frequency effects in a high-performance superconducting bearing.
,
2002
.