Composite Ceramic Superconducting Wires for Electric Motor Applications
Quarterly rept. no. 7, 1 Jan-31 Mar 1990
CERAMICS PROCESS SYSTEMS CORP MILFORD MA
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Silver clad polycrystalline Y-123 wire is being fabricated with a continuous reel-to-reel process. Scale-up activities are underway to produce enough wire for the field coils of the HTSC motor. We have produced green HTSC fiber is kilometer lengths, and sintered wires up to 166 meters long. The 77K Jc values are 1000-2800 Asq cm in self field. To improve Jc of the Y-123 wire, development began on directional crystallization, including preliminary work at A.D. Little and Oak Ridge National Lab. Large lots of BiSCCO material were produced to fabricated fibers and sintered polycrystalline BiSSCO wire as rolled tape. Work continued in collaboration with Sandia and Los Alamos National Laboratories on rapid thermal processing of Y-123, with most emphasis on characterizing the rapid oxygenation effect. The design of the HTSC homopolar motor has been improved to increase the output from field coils by using six smaller coils, each with separately optimized current. Motor construction is in progress. Preliminary design is underway on a DC heteropolar motor with HTSC field windings and armature and a brushless trapped flux permanent magnet DC motor, in which the field is produced by trapped flux in an HTSC rotor.
- Metallurgy and Metallography