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Present status of R&D for superconducting flywheels.

[In Japanese. / En japonais.]

Author(s) : MATSUNAGA K., TOMITA M., IKEZAWA H., et al.

Type of article: Article

Summary

Superconducting flywheels store energy in a rotating wheel that is supported by superconducting magnetic bearings. The superconducting magnetic bearing (SMB) consists of a bulk superconductor stator and a permanent magnet rotor. The rotor is levitated by the pinning force of the bulk superconductor. The SMB has lower rotational loss than conventional mechanical bearings and is suitable for long-term energy storage such as the diurnal load levelling of electric power. Research and development of a 10 kWh system and a 100 kWh SMB module using radial-type SMBs are being conducted. As a long-term goal, the NEDO project aims to develop a 10 MWh power storage system to level diurnal power load. A Japanese group fabricated a thrust-type SMB of 620 mm in diameter. A Japanese laboratory tested a 2.25 kWh system using a hybrid bearing consisting of SMBs and permanent magnet bearings. A 10 kWh system was studied by Boeing Co., as a SPI (superconductivity partnership initiatives) project in the USA.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2004-0498
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 37 - n. 11
  • Publication date: 2002
  • Document available for consultation in the library of the IIR headquarters only.

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