Construction of the stator installed in the superconducting magnetic bearing for a 10 kWh flywheel

N. Koshizuka, K. Matsunaga, N. Yamachi, A. Kawaji, H. Hirabayashi, M. Murakami, M. Tomita, S. Une, S. Saito, M. Isono, H. Nasu, T. Maeda, F. Ishikawa

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We fabricated a superconducting magnetic bearing module consisting of a stator of epoxy resin impregnated YBaCuO bulks and a rotor of NdFeB permanent magnet circuits. We obtained levitation force density of 10.5 N/cm2 at 67 K and rotation loss per levitation force of 2.5 mW/N at 77 K. The rotation loss was reduced by the decrease of magnetic field inhomogeneity in the circular direction along the ring shape permanent magnet of the rotor. Based on these results we constructed a stator consisting of five modules and installed in the form of superconducting magnetic bearing for a 10 kWh class flywheel energy storage test system.

Original languageEnglish
Pages (from-to)756-760
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberSPEC. ISS.
Publication statusPublished - 2004 Oct
Externally publishedYes


  • Flywheel energy storage system
  • Levitation force
  • Rotation loss
  • Superconducting magnetic bearing
  • Superconducting stator

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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