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One-piece ring Nd-Fe-B high performance permanent magnets are successfully produced for the radial type superconductive magnetic bearing (SMB) of 10 kWh class flywheel system. The inhomogeneity of magnetic flux density achieved is quite small and is less then +/-1% in the whole ring magnet with the size of OD 160.0xID 126.8x12.25 mm, where OD is outer diameter and ID is inner diameter. Levitation...
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