Spin-down measurements and loss calculation of multi-layer, multi-pole HTS magnetic bearings

Z. Kohari, I. Vajda

Research output: Article

2 Citations (Scopus)


Superconducting (SC) bearings are one of the most promising applications of superconductors, which could contribute significantly to a relevant progress to kinetic energy storage. A key feature of these bearings with a special view on their industrial applications is the coefficient of friction. Losses of different configurations are intensively investigated worldwide. Numerous structures and geometric arrangements have been developed in order to decrease the coefficient of friction and to increase the utilization of the superconductors (SCs) and permanent magnets (PMs) (Mulcahy et al 2001 IEEE Trans. Appl. Supercond. 11729-32; Sung et al 2002 Cryogenics 42 357-62; Filatov and Maslen 2001 IEEE Trans. Magn. 37 3913-23) In this paper we present mostly experimental analysis of multi-layer, multi-pole magnetic configurations. On the basis of the results of these measurements we tried to determine the best configuration regarding the losses, stability and load capability of the bearings. Spin-down measurements were performed in a vacuum chamber (10 -4 mbar), in order to measure the coefficient of friction, and to verify the stability of the superconducting bearings over a high speed range. For the measurements a special small brushless permanent magnet DC motor with an ironless stator was developed and used. A maximum speed of 11000 rpm was successfully reached.

Original languageEnglish
Pages (from-to)S105-S110
JournalSuperconductor Science and Technology
Issue number2
Publication statusPublished - febr. 1 2005

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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