Title :
The design and construction of a 1500 W HTS superconducting synchronous machine
Author :
Mikkonen, R. ; Söderlund, L. ; Eriksson, J.-T.
Author_Institution :
Tampere Univ. of Technol., Finland
fDate :
7/1/1996 12:00:00 AM
Abstract :
A four-pole rotating armature type synchronous machine with HTS stationary field windings has been constructed. The Bi-2223/Ag racetrack coils are made by American Superconductor Co. An overall current density of 4,700 A/cm2 has been obtained at the operating temperature of 20 K in a 0.7 T field. At 20 K, silver and Bi-2223 have much higher heat capacities compared to 4 K. This combined with a wide margin between the operating and critical temperature improves the stability of the magnet system. In addition the ratio of the stored energy of the coils and the required cooling power reaches a maximum in the temperature range of 20-40 K. The cryostat has also been designed in order to meet the requirements of liquid helium. The armature is a three-phase air gap copper winding. A description of the machine and a design based on 3D field analysis in steady-state operation are presented
Keywords :
design engineering; electromagnetic fields; high-temperature superconductors; machine theory; machine windings; superconducting machines; superconducting magnets; synchronous machines; 0.7 T; 1500 W; 20 K; 20 to 40 K; 3D field analysis; BiSrCaCuO-Ag; Cu; HTSC; current density; heat capacities; high-Tc superconductors; rotating armature machine; steady-state operation; superconducting magnet stability; superconducting synchronous machine; three-phase air gap winding; Cooling; Current density; High temperature superconductors; Machine windings; Silver; Stability; Superconducting coils; Superconducting magnets; Synchronous machines; Trigeneration;
Journal_Title :
Magnetics, IEEE Transactions on
