TY - JOUR
T1 - Numerical analysis of fundamental characteristics of superconducting magnetic bearings for a polarization modulator
AU - Terachi, Yusuke
AU - Terao, Yutaka
AU - Ohsaki, Hiroyuki
AU - Sakurai, Yuki
AU - Matsumura, Tomotake
AU - Sugai, Hajime
AU - Utsunomiya, Shin
AU - Kataza, Hirokazu
AU - Yamamoto, Ryo
N1 - Funding Information:
This work was supported by MEXT KAKENHI Grant Numbers JP15H05441 and JSPS Core-to-Core Program, A. Advanced Research Networks. This work was also supported by World Premier International Research Center Initiative (WPI), MEXT, Japan.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2017/7/26
Y1 - 2017/7/26
N2 - 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.
AB - 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.
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U2 - 10.1088/1742-6596/871/1/012094
DO - 10.1088/1742-6596/871/1/012094
M3 - Conference article
AN - SCOPUS:85028020421
SN - 1742-6588
VL - 871
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012094
T2 - 29th International Symposium on Superconductivity, ISS 2016
Y2 - 13 December 2016 through 15 December 2016
ER -