Numerical analysis of fundamental characteristics of superconducting magnetic bearings for a polarization modulator

We have carried out numerical analysis of mechanical properties of a superconducting magnetic bearing (SMB). A contactless bearing operating at below 10 K with low rotational energy loss is an attractive feature to be used as a rotational mechanism of a polarization modulator for a cosmic microwave...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-07, Vol.871 (1), p.12094
Main Authors: Terachi, Yusuke, Terao, Yutaka, Ohsaki, Hiroyuki, Sakurai, Yuki, Matsumura, Tomotake, Sugai, Hajime, Utsunomiya, Shin, Kataza, Hirokazu, Yamamoto, Ryo
Format: Article
Language:English
Subjects:
Configuration management
Cosmic microwave background
Design optimization
Electromagnetic forces
Energy dissipation
Finite element method
Magnetic bearings
Magnetic flux
Magnetic properties
Mechanical properties
Numerical analysis
Permanent magnets
Physics
Polarization
Superconductivity
Two dimensional analysis
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Summary:We have carried out numerical analysis of mechanical properties of a superconducting magnetic bearing (SMB). A contactless bearing operating at below 10 K with low rotational energy loss is an attractive feature to be used as a rotational mechanism of a polarization modulator for a cosmic microwave background experiment. In such application, a rotor diameter of about 400 mm forces us to employ a segmented magnet. As a result, there is inevitable spatial gap between the segments. In order to understand the path towards the design optimizations, 2D and 3D FEM analyses were carried out to examine fundamental characteristics of the SMBs for a polarization modulator. Two axial flux type SMBs were dealt with in the analysis: (a) the SMB with axially magnetized permanent magnets (PMs), and (b) the SMB with radially magnetized PMs and steel components for magnetic flux paths. Magnetic flux lines and density distributions, electromagnetic force characteristics, spring constants, etc. were compared among some variations of the SMBs. From the numerical analysis results, it is discussed what type, configuration and design of SMBs are more suitable for a polarization modulator.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/871/1/012094