Application of superconducting magnetic bearings to a 10 kWh-class flywheel energy storage system

Takumi Ichihara, Koji Matsunaga, Makoto Kita, Izumi Hirabayashi, Masayuki Isono, Makoto Hirose, Keiji Yoshii, Kazuaki Kurihara, Osamu Saito, Shinobu Saito, Masato Murakami, Hirohumi Takabayashi, Mitsutoshi Natsumeda, Naoki Koshizuka

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Radial type superconducting magnetic bearings have been developed for a 10 kWh-class flywheel energy storage system. The bearings consist of an inner-cylindrical stator of YBCO bulk superconductors and an outer-rotor of permanent magnets. The rotor is suspended without contact via the pinning forces of the bulk superconductors that are arranged such that the c-axis of each superconductor is aligned parallel to the radial direction of the cylinder. In this paper, we describe the implementation of the stator part and report the SMB test results, namely that the rotor was successfully rotated at up to 7,500 rpm. Thus we succeeded in energy storage of 2.24 kWh.

Original languageEnglish
Pages (from-to)2245-2248
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2 PART II
DOIs
Publication statusPublished - 2005 Jun 1

Keywords

  • Flywheel energy storage system
  • Pinning force
  • Radial type superconducting magnetic bearings
  • YBCO bulk superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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  • Cite this

    Ichihara, T., Matsunaga, K., Kita, M., Hirabayashi, I., Isono, M., Hirose, M., Yoshii, K., Kurihara, K., Saito, O., Saito, S., Murakami, M., Takabayashi, H., Natsumeda, M., & Koshizuka, N. (2005). Application of superconducting magnetic bearings to a 10 kWh-class flywheel energy storage system. IEEE Transactions on Applied Superconductivity, 15(2 PART II), 2245-2248. https://doi.org/10.1109/TASC.2005.849622