Rotation loss reduction of superconducting magnetic bearings by stacking and rearranging the shape of the bulks

M. Kita, T. Ichihara, I. Masaie, K. Demachi, N. Sakai, I. Hirabayashi

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Energy storage by a flywheel system has recently been developed as a promising application of high temperature superconducting bulks. Rotation loss reduction is necessary for an efficient operation of the superconducting magnetic bearings (SMB), which is the most essential component of the system. Typical radial type SMB consists of a superconductor stator and a permanent magnet rotor that is sustained by a magnetic force deduced from high flux pinning of the bulk superconductors. If the stator is a simply segmented circular array of Y-Ba-Cu-O bulks, inhomogeneity of the trapped magnetic field is unavoidable, which induces eddy currents in the metallic component in the rotor. Such a rotation loss is one of the major problems for a practical use of SMB. We will present the relationship between the inhomogeneous magnetic field and the rotation loss of SMB and give a general principle for reduction of rotation loss in SMB.

Original languageEnglish
Pages (from-to)821-825
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberI
Publication statusPublished - 2005 Oct 1
Externally publishedYes
EventProceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity -
Duration: 2004 Nov 232004 Nov 25


  • Gd-Ba-Cu-O
  • Rotation loss
  • Superconducting magnetic bearing
  • Y-Ba-Cu-O

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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