Fabrication and evaluation of superconducting bearing module for 10 kW h flywheel

We constructed a model superconducting magnetic bearing (SMB) module which will be installed for the 10 kW h class flywheel. The bearing is a radial type in that YBCO bulks are installed in the inner-stator and permanent magnet (PM) circuit in the outer-rotor. The PM circuit consists of NdFeB magnet...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-10, Vol.378, p.883-887
Main Authors: Matsunaga, K, Tomita, M, Yamachi, N, Iida, K, Yoshioka, J, Isono, M, Hirose, M, Nasu, H, Kameno, H, Kubo, A, Takahata, R, Kitai, N, Yamamoto, H, Nakamura, Y, Koshizuka, N, Murakami, M
Format: Article
Language:English
Subjects:
Levitation force density
Rotational loss
Superconducting magnetic bearing
YBCO bulk superconductor
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Summary:We constructed a model superconducting magnetic bearing (SMB) module which will be installed for the 10 kW h class flywheel. The bearing is a radial type in that YBCO bulks are installed in the inner-stator and permanent magnet (PM) circuit in the outer-rotor. The PM circuit consists of NdFeB magnets and SPCC yokes. The maximum levitation force density of the superconducting bearing was 9.0 N/cm 2 at 77 K. The rotational loss of the SMB was 8.03 W at 6000 rpm with the load of 838 N, which was mainly caused by an inhomogeneity in magnetic field generated from the PM circuit.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(02)01819-1