Flywheel energy storage system with a horizontal axle mounted on high Tc superconductor bearings
✍ Scribed by T.H Sung; J.S Lee; Y.H Han; S.C Han; C.J Kim; G.W Hong; S.K Choi; Y.C Kim; S.J Kim
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 614 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
We studied on parameters aecting the nucleation and growth of a Y123 single-domained crystal in top-seeded melt processing. We developed a new processing, two-step undercooling technique. The keys of this technique are the controlled nucleation of Y123 at the primary undercooling state and the accelerated growth at the secondary undercooling temperature. Optimization of the processing parameters in the two-step undercooling technique considerably reduced the processing time required for the growth of the Y123 single crystal without degradation of the levitation property. We developed a new type of ¯ywheel energy storage system that has a horizontal axle with high T c superconductor bearings using the Y123 single-domained crystals. The dynamic properties, stiness and damping, of the high T c superconductor radial bearings applied in the ¯ywheel energy storage system were experimentally estimated using the imbalance excitation method. The imbalance excitation method applied to this rotor-bearing system identi®ed the direct stiness and damping of the high temperature superconductor (HTS) bearings to be 2:8±3:3 Â 10 5 N/m and 175±204 Ns/m, respectively.