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/cm2 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.
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