Evaluation of the effect of gravity on the rotational loss of superconducting magnetic bearings for space applications

Satsuki Okumura, Takemi Onoue, Doa Ahmad, Yutaka Terao, Hiroyuki Ohsaki, Yuki Sakurai, Tomotake Matsumura, Nobuhiko Katayama

Research output: Contribution to journalConference articlepeer-review

Abstract

We study the relationship between the levitation gap change and losses in a superconducting magnetic bearing (SMB) system. We develop a polarization modulator bearing for a cosmic microwave background (CMB) polarization experiment. The heat generated by the polarization modulator needs to be kept very low. Therefore, it is essential to model the effect of the levitation gap change of a rotor due to gravity on the rotational loss. We have constructed a prototype small experimental platform of an axial-flux SMB with an array of high-temperature superconductors, YBCO, and a permanent magnet ring. In this system, the weight of the rotor can be set. We measured the effect of the change in the levitation gap of the rotor due to gravity on the loss. When the levitation force was 5.5 N and 16.0 N, the losses generated in the rotor were 9.1 × 10-3 W and 1.6 × 10-2 W, respectively. It was confirmed that the loss increases with the increase in the levitation force of the SMB.

Original languageEnglish
Article number012039
JournalJournal of Physics: Conference Series
Volume2323
Issue number1
DOIs
Publication statusPublished - 2022
Externally publishedYes
Event34th International Symposium on Superconductivity, ISS 2021 - Virtual, Online
Duration: Nov 30 2021Dec 2 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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