Present status of R & D on superconducting magnetic bearing technologies for flywheel energy storage system

N. Koshizuka, F. Ishikawa, H. Nasu, M. Murakami, K. Matsunaga, S. Saito, O. Saito, Y. Nakamura, H. Yamamoto, R. Takahata, T. Oka, H. Ikezawa, M. Tomita

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We report on the NEDO project of superconducting magnetic bearing (SMB) technologies for flywheel energy storage system. We fabricated SMB modules which consist of a stator of roof-tile shape YBaCuO bulks and a NdFeB permanent magnet circuit. The levitation force density of the bearings was 9 N/cm2. It was confirmed that pre-loading and excess cooling methods are both effective for suppressing the gradual fall of rotor due to flux creep. We designed a basic concept of 10 kWh class flywheel energy storage system and investigated the feasibility of active magnetic bearings for the 10 kWh system. We also examined the fabrication condition of CFRP flywheels for the system.

Original languageEnglish
Pages (from-to)11-17
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1

    Fingerprint

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

Cite this

Koshizuka, N., Ishikawa, F., Nasu, H., Murakami, M., Matsunaga, K., Saito, S., Saito, O., Nakamura, Y., Yamamoto, H., Takahata, R., Oka, T., Ikezawa, H., & Tomita, M. (2002). Present status of R & D on superconducting magnetic bearing technologies for flywheel energy storage system. Physica C: Superconductivity and its applications, 378-381(PART 1), 11-17. https://doi.org/10.1016/S0921-4534(02)01374-6