TY - JOUR
T1 - Modelling the Energy Losses of a Superconducting Magnetic Bearing due to the Change of the Levitation Height under Gravity
AU - Ishida, Y.
AU - Enokida, H.
AU - Ahmad, D.
AU - Terao, Y.
AU - Ohsaki, H.
AU - Sakurai, Y.
AU - Sugai, H.
AU - Matsumura, T.
AU - Katayama, N.
N1 - Funding Information:
We acknowledge the World Premier International Research Center Initiative (WPI), MEXT, Japan for support through Kavli IPMU. This work was supported by JSPS KAKENHI Grant Numbers JP17H01125 and 18KK0083.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2021/4/19
Y1 - 2021/4/19
N2 - This paper describes the losses of the rotor of the prototype superconducting magnetic bearing (SMB) that is employed for a polarization modulator of a Cosmic Microwave Background polarization experiment. The stator is composed of 20 segmented YBCO bulks, and these multiple superconductors produce the inhomogeneous magnetic field particularly due to the gravitational displacement of the rotor magnet position from the initial field cooling. This inhomogeneity causes the power dissipation to the spinning rotor. We estimated the power dissipation originating from this inhomogeneous magnetic field by using a numerical approach. The superconductors were modelled as electrically conducting components in the numerical simulation to avoid the complexity in modelling superconductivity. The results show about 4 mW dissipated at the rotor.
AB - This paper describes the losses of the rotor of the prototype superconducting magnetic bearing (SMB) that is employed for a polarization modulator of a Cosmic Microwave Background polarization experiment. The stator is composed of 20 segmented YBCO bulks, and these multiple superconductors produce the inhomogeneous magnetic field particularly due to the gravitational displacement of the rotor magnet position from the initial field cooling. This inhomogeneity causes the power dissipation to the spinning rotor. We estimated the power dissipation originating from this inhomogeneous magnetic field by using a numerical approach. The superconductors were modelled as electrically conducting components in the numerical simulation to avoid the complexity in modelling superconductivity. The results show about 4 mW dissipated at the rotor.
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U2 - 10.1088/1742-6596/1857/1/012015
DO - 10.1088/1742-6596/1857/1/012015
M3 - Conference article
AN - SCOPUS:85104848038
SN - 1742-6588
VL - 1857
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012015
T2 - 10th Asian Conference on Applied Superconductivity and Cryogenics, ACASC 2020, 2nd International Cryogenic Materials Conference in Asia, Asian-ICMC 2020 and CSSJ Joint Conference
Y2 - 6 January 2020 through 9 January 2020
ER -