Abstract
We report present status of NEDO project on "Superconducting bearing technologies for flywheel energy storage systems". We fabricated a superconducting magnetic bearing module consisting of a stator of resin impregnated YBaCuO bulks and a rotor of NdFeB permanent magnet circuits. We obtained levitation force density of 8 N/cm2 at 81 K and rotation loss per levitation force of 3 mW/N at 77 K. We confirmed that both pre-loading and excess cooling methods are effective for suppressing gradual fall of rotor due to flux creep. We designed a 10 kWh class flywheel energy storage test system and investigated feasibility of active magnetic bearings for controlling rotation axis vibration under high speed rotation of the flywheel.
| Original language | English |
|---|---|
| Pages (from-to) | 444-450 |
| Number of pages | 7 |
| Journal | Physica C: Superconductivity and its applications |
| Volume | 386 |
| DOIs | |
| Publication status | Published - 2003 Apr 15 |
| Externally published | Yes |
| Event | ICMC 2002 - Xi an, China Duration: 2002 Jun 16 → 2002 Jun 20 |
Keywords
- Active magnetic bearing
- Flywheel energy storage system
- Levitation force
- Rotation loss
- Superconducting magnetic bearing
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
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Koshizuka, N., Ishikawa, F., Nasu, H., Murakami, M., Matsunaga, K., Saito, S., Saito, O., Nakamura, Y., Yamamoto, H., Takahata, R., Itoh, Y., Ikezawa, H., & Tomita, M. (2003). Progress of superconducting bearing technologies for flywheel energy storage systems. Physica C: Superconductivity and its applications, 386, 444-450. https://doi.org/10.1016/S0921-4534(02)02206-2