Numerical analysis of rotation loss of superconducting magnetic bearing

K. Demachi, A. Miura, T. Uchimoto, K. Miya

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


The degradation of levitation force and rotation speed is one of the most significant problems for the practical use of superconducting magnetic bearings (SMB) for flywheel energy storage system. The rotation loss is caused by the AC magnetic field due to the inhomogeneous distribution of magnetic flux density of the permanent magnet (PM) rotor. A simulation method has been developed by our group to simulate the rotation losses. In this research, this method was improved so that the eddy current flowing in the cryostat around the superconductor was taken into account. The dependency of the rotation losses of radial type SMB with cryostat were evaluated by this new simulation method with respect to the levitating height, the initial rotation speed and the amplitude of inhomogeneous component of PM rotor's field.

Original languageEnglish
Pages (from-to)1653-1655
Number of pages3
JournalIEEE Transactions on Applied Superconductivity
Issue number1 II
Publication statusPublished - 2001 Mar
Externally publishedYes
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: 2000 Sept 172000 Sept 22


  • Eddy current flowing in cryostat of SMB
  • Levitation force
  • Rotation losses
  • Superconducting flywheel
  • Superconducting magnetic bearing

ASJC Scopus subject areas

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


Dive into the research topics of 'Numerical analysis of rotation loss of superconducting magnetic bearing'. Together they form a unique fingerprint.

Cite this