Characterization of non-contact torque transfer and switching system for superconducting flywheel

M. Ikeda, K. Takeda, H. Hasegawa, H. Seino, K. Nagashima, M. Murakami

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Superconducting flywheel energy storage system can store the energy for a long duration, in that the main body of a flywheel is placed in a vacuum chamber to minimize rotational loss, and is separated from a generation motor. The superconducting flywheel device need a non-contact system which can transfer the rotational torque without contact. A combination of two permanent magnets can transmit the power without contact. We calculated the torque forces and the field distributions of two types of magnetic arrays; repulsive type and Halbach type. Both magnetic circuits have respective inner and outer diameters of 61.5 and 144 mm and consist of eight poles of Fe-Nd-B permanent magnets 30 mm in thickness. We also studied the effects of the number of poles and the size on the transferable torque forces and found that a practical torque transfer and switching systems can be constructed with a combination of permanent magnetic circuits.

Original languageEnglish
Pages (from-to)1224-1226
Number of pages3
JournalPhysica C: Superconductivity and its applications
Issue number20
Publication statusPublished - 2010 Nov 1


  • Halbach array
  • Non-contact
  • Superconducting energy storage system
  • Switch
  • Torque transfer

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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