Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Static Properties of Superconductor Journal Bearing Substator for Superconductor Flywheel Energy Storage System

초전도 저널베어링 Substator의 특성평가

  • Park, B.J. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Jung, S.Y. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Lee, J.P. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Park, B.C. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Jeong, N.H. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Sung, T.H. (Korea Electric Power Research Institute, Superconductivity & Applications Group) ;
  • Han, Y.H. (Korea Electric Power Research Institute, Superconductivity & Applications Group)
  • Published : 2008.10.31
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Abstract

A Superconductor Flywheel Energy Storage System(SFES) mainly consists of a pair of non-contacting High Temperature Superconductor(HTS) bearings that provide very low frictional losses, a composite flywheel with high energy storage density. The HTS bearings, which offer dynamic stability without active control, are the key technology that distinguishes the SFES from other flywheel energy storage devices, and great effort is being put into developing this technology. The Superconductor Journal Bearing(SJB) mainly consists of HTS bulks and a stator, which holds the HTS bulks and also acts as a cold head. Static properties of HTS bearings provide data to solve problems which may occur easily in a running system. Since stiffness to counter vibration is the main parameter in designing an HTS bearing system, we investigate SJB magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measure stiffness in static condition and the results are used to determine the optimal number of HTS bulks for a 100kWh SFES.

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