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A permanent-magnet rotor for a high-temperature superconducting bearing

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8 Author(s)
T. M. Mulcahy ; Energy Technol. Div., Argonne Nat. Lab., IL, USA ; J. R. Hull ; K. L. Uherka ; R. G. Abboud
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Design, fabrication, and performance of a 0.39-m diam., 6.8-kg flywheel rotor with only one bearing is discussed. To achieve low-loss energy storage, the rotor's segmented-ring permanent magnet (PM) is optimized for levitation and circumferential homogeneity. A PM figure of merit is proposed that appears to correlate with loss data. Pre compression of the PM with fiber-composite banding is necessary for practical rotor speeds

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IEEE Transactions on Magnetics  (Volume:32 ,  Issue: 4 )