On the Multiple-Ring Coil System for SMES

  • Tadao Ezaki
  • Fujio Irie


A new coil system named “multiple-ring coil system” for the intermediate SMES is proposed. This system consists of concentric multiple low aspect ratio coils in which the direction of current is opposit to those of adjacent coils. Characteristic features of this system such as the reduction of hoop force acting on the coil conductor, total force on them and leakage magnetic field are discussed in comparison with a single solenoid system and a toroidal coil system. A conceptual design for an intermediate scale SMES of 100MWh shows that this system has advantages of the small hoop stress and the small leakage magnetic field to the single solenoid system and an advantage of the small total force to the toroidal coil system.


Total Force Hoop Stress Coil System Superconducting Magnet Energy Storage Leakage Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. (1).
    Boom, R.W. and Peterson, H.A., Superconductive energy storage for large system. IEEE Trans, on Magnetics, 1972, MAG-8, 701–703.CrossRefGoogle Scholar
  2. (2).
    Hassenzaahl, W.V., Will superconductive magnetic energy be used on electric utility system?. IEEE Trans. on Magnetics, 1975, MAG-11, 482–488.Google Scholar
  3. (3).
    Nitta, T. and Okada, T., Control and characteristics of SMES connected to power system. Proc. US-3apan Workshop on SMES, Madison, USA, 1981, 64–78.Google Scholar
  4. (4).
    Mitani, Y., Tsuji, K., Ise, T. and Murakami, Y., Fundamental study on electrical power system stabilization using superconducting magnet energy storage, Proc. MT-9, 1985, 353–356.Google Scholar

Copyright information

© The Institute of Electrical Engineers of Japan 1990

Authors and Affiliations

  • Tadao Ezaki
    • 1
  • Fujio Irie
    • 2
  1. 1.Oita UniversityOita 870-11Japan
  2. 2.Kyushu Engineering DepartmentKinki UniversityIizuka 820Japan

Personalised recommendations