An Experimental Generator using High Temperature Superconducting Quasi-Permanent Magnets

An experimental axial gap generator, with a 6 inch diameter rotor and quasi-permanent HTS magnets, was tested. A variable speed motor was used to rotate the rotor above a stator composed of copper wire wound in an 8 pole 3 phase configuration. The rotor and stator were both run in liquid nitrogen. A 3 phase variable resistor bank was the generator load. The HTS magnets were YBCO, each 2cm in diameter and 1 cm thick, melt textured using a SmBCO seed, containing 60% excess Y, and about 1% Pt. They were not irradiated, and could trap maximum fields of 3500-4000 G. First, the HTS magnets were field cooled in a field approximately 2200 G, provided by that stator while carrying 25 Amperes. The HTS magnets were warmed, and then zero field cooled. In this case, activation was accomplished by a ~ 15 ms pulse on the stator, providing 5000 G of pulsed field. The HTS magnets trapped about 2600 G. The generator was then run for about 1 hour at speeds up to 2265 RPM, and developed a maximum power output of just under 100 Watts.

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An Experimental Generator using High Temperature Superconducting Quasi-Permanent Magnets