Superconductive D-C Ship Drive Systems,
Abstract
Superconductors are materials which exhibit zero electrical resistance at temperatures near absolute zero, supporting current densities in the order of 100,000 amperes per sq cm in the filamentary wire form. When wound into magnets helium cooled superconductors provide the compact, high flux source necessary for small, efficient electric machines. In ship drive applications, the use of high-power density superconductive generators and motors provide great flexibility of arrangement and of operation. These advantages are illustrated in advanced displacement and surface effect ship hulls with size and performance estimates based on NSRDC d-c machine developments. A recently completed acyclic machine, with a unique magnet-shield configuration designed to maximize flux utilization and power density, is described. The 51 cm (20 inch) diameter unit, now under evaluation, is expected to demonstrate more than 5000 hp per cubic meter at propulsion motor speeds. The machine includes a stationary, niobium titanium wire, solenoidal magnet surrounded by a 1010 steel magnetic shield. Rotor and stator copper drum conductors, series connected through liquid metal brushes, operate in the magnet/shield annulus.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- ADA082504
Entities
People
- David W Taylor
- T. J. Doyle