Fabrication and evaluation of superconducting bearing module for 10 kW h flywheel

K. Matsunaga, M. Tomita, N. Yamachi, K. Iida, J. Yoshioka, M. Isono, M. Hirose, H. Nasu, H. Kameno, A. Kubo, R. Takahata, N. Kitai, H. Yamamoto, Y. Nakamura, N. Koshizuka, M. Murakami

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We constructed a model superconducting magnetic bearing (SMB) module which will be installed for the 10 kW h class flywheel. The bearing is a radial type in that YBCO bulks are installed in the inner-stator and permanent magnet (PM) circuit in the outer-rotor. The PM circuit consists of NdFeB magnets and SPCC yokes. The maximum levitation force density of the superconducting bearing was 9.0 N/cm2 at 77 K. The rotational loss of the SMB was 8.03 W at 6000 rpm with the load of 838 N, which was mainly caused by an inhomogeneity in magnetic field generated from the PM circuit.

Original languageEnglish
Pages (from-to)883-887
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberPART 1
Publication statusPublished - 2002 Oct 1
Externally publishedYes


  • Levitation force density
  • Rotational loss
  • Superconducting magnetic bearing
  • YBCO bulk superconductor

ASJC Scopus subject areas

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


Dive into the research topics of 'Fabrication and evaluation of superconducting bearing module for 10 kW h flywheel'. Together they form a unique fingerprint.

Cite this