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A permanent-magnet motor with a superconducting armature associates the high current densities in superconductors and the simplicity of a rotating permanent-magnet inductor. Those characteristics make them very attractive drives for moving systems with low weight requirements. We carry out a research and development program on this structure. After a first 15-kW, 750-rpm successfully tested model, a demonstrator of 150-kW and 400-rpm has been built. The layout of this eight-pole, 150-kW machine is conventional with a horizontal axis and a rotating neodymium-iron-boron inductor cooled at 150 K. The three phase winding is made with a (6+1) superconducting ultra fine niobium-titanium cable. The 24 saddle-shape coils are distributed among four concentric tubes. Their holding has been well studied. The liquid-helium cryostat (1000 mm long and 630 mm in diameter) was built using essentially composites. It has successfully suffered first cryogenic and some electrical tests which are reported.
Date of Publication: June 1999