A rotor model with two gradient static field shafts

Abstract

We tested a rotor model with two gradient static field shafts which is lifted between a set of the magnets and a trapped static magnetic field of a HTS bulk. The combined magnets were composed of one cylindrical magnet and two ring magnet. The cylindrical magnet was 20 mm in diameter, 10 mm in thickness, and 0.45 T. The ring magnet was 30 mm in inside diameter, 50 mm in outside diameter, 5 mm in thickness, and 0.33 T. The cylindrical magnet was arranged to be the opposite pole in the center of a ring magnet. The set of the magnets yielded a magnetic field like “Mexican hut”. The rotor was 70 mm in diameter, 70 mm in height, and was composed of acrylic pipes of various sizes. One magnet each was arranged on the top and the bottom of the rotor respectively for lifting, and 4 plate magnets (20 mm × 10 mm, 2 mm in thickness, 0.23 T) were arranged in the central side of the cylinder to be alternate poles of the search magnet or the generator magnet. Two superconductor bulks are Dy bulk of 47 mm in diameter. The bulk is trapped in the magnetic field at 77 K (in Liquid nitrogen) as magnetic shaft. When lifting was stable, after the two coils and the two air nozzles has set. The rotor was rotated at over 2000 rpm by the nitrogen gas wind at 0.490 MPa and a coil was generated at 0.5 V.