Magnetically coupled gear based drive mechanism for contactless continuous rotation using superconducting magnetic bearing below 10 K

T. Matsumura, Y. Sakurai, H. Kataza, S. Utsunomiya, R. Yamamoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We present the design and mechanical performances of a magnetically coupled gear mechanism to drive a levitating rotor magnet of a superconducting magnetic bearing (SMB). The SMB consists of a ring-shaped high-temperature superconducting array (YBCO) and a ring-shaped permanent magnet. This rotational system is designed to operate below 10 K, and thus the design philosophy is to minimize any potential source of heat dissipation. While an SMB provides only a functionality of namely a bearing, it requires a mechanism to drive a rotational motion. We introduce a simple implementation of a magnetically coupled gears between a stator and a rotor. This enables to achieve enough torque to drive a levitating rotor without slip at the rotation frequency of about 1 Hz below 10 K. The rotational variation between the rotor and the drive gear is synchronised within σ=0.019 Hz. The development of this mechanism is a part of the program to develop a testbed in order to evaluate a prototype half-wave plate based polarization modulator for future space missions. The successful development allows this modulator to be a candidate for an instrument to probe the cosmic inflation by measuring the cosmic microwave background polarization.

Original languageEnglish
Pages (from-to)138-141
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume530
DOIs
Publication statusPublished - Nov 15 2016
Externally publishedYes

Keywords

  • Cryogenic drive
  • Polarimetry
  • Superconducting magnetic bearing

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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