HTSC Bulk Magnetizing Control System for Cryogenic Alternators

Abstract

The first HTSC alternators developed and tested mainly contained the bulks on the rotor. The presentation covers the problem of HTSC bulks magnetizing control in an assembled cryogenic alternator with axial flux. Cylindrical bulks are positioned on the rotor of a synchronous machine and form a multi-pole excitation system. The trapped magnetic field may vary under a number of processes, magnetic flux creep included. A special system to control the value of bulk magnetization and the temperature in the cryogenic zone is developed. Similar system may by applied in cryogenic disc-type alternators with permanent magnets on the rotor.