Active magnetic bearing for a liquid nitrogen pump

Yasuharu Kamioka*, Kazuhiro Kajikawa, Hirokazu Hirai, Shinsuke Ozaki, Taketsune Nakamura, Shinsaku Imagawa, Atsushi Ishiyama

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


The development of a liquid nitrogen submerged pump for HTS applications is underway. A cryogenic active magnetic bearing is the main component of the pump. The bearing makes the maintenance interval of the pump longer than 3years such interval is essential for the pump in commercial use of HTS applications such as long HTS cable. The bearing will be set in a HTS motor shaft of the pump. In experiments, a shaft without an HTS motor is used and the bearing was immersed in liquid nitrogen. The rotation of the shaft is made by a high-speed motor at room temperature. The bearing consists of two radial bearings and one axial bearing. The shaft was floating by the bearing and was rotated by the motor at room temperature. The steady rotation speed of 2,000, 3,000, 4,000 and 5,000 rpm were achieved, and the rotation speed satisfied the design speed of the pump which is 5,000rpm.

Original languageEnglish
Article number012153
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - 2019 Jun 3
Event27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018, ICEC-ICMC 2018 - Oxford, United Kingdom
Duration: 2018 Sept 32018 Sept 7

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)


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