Fundamental Study on Generation Characteristics of a HTS Induction/Synchronous Machine

Abstract

This paper describes a fundamental study on the generation characteristics of a high T_c superconducting induction/synchronous machine (HTS-ISM), with a structure the same as squirrel-cage induction machines. Bi-2223/Ag multifilamentary tapes are utilized for the fabrication of the secondary windings, and a commercialized 3-phase, 4-pole stator is introduced. The fabricated HTS-ISM is immersed in liquid nitrogen, and then operated at a frequency of 60 Hz. It is shown for the first time that our HTS machine can generate active power at synchronous speed when the primary windings are excited. This indicates that synchronous generation can be realized with the simple structure of HTS-ISM.