Current Estimation of an HTS BSCCO Magnet Having Multiple Power Sources Based on the Field Dependent $E{\hbox{–}}J$ Relation

Abstract

Due to the anisotropy of a tape-shaped HTS wire, the method to determine the operating current of an HTS magnet needs to be different from that of a LTS magnet. This paper presented estimation of the critical current of pancake windings excited by multiple power sources. Critical currents were determined by using field dependent -relation. A new method to define the magnetic field of the HTS wire has been proposed in this paper. Calculated critical currents of pancake windings were compared with measured ones of the HTS BSCCO magnet consisting of 10 pancake windings. Effects of multiple power excitation on the increment of the central magnetic field has been also described. Test results showed the estimated critical currents of pancake windings agreed well with that of measured ones and the central magnetic field was increased at multiple power excitation by 28.4% comparing with that of single power excitation.Index Terms--relation, HTS BSCCO magnet, multiple power excitation, pancake winding.

A New Outer-Rotor Hybrid-Excited Flux-Switching Machine Employing the HTS Homopolar Topology

“…The HTS field coil is a significant component of the FSM. Electric machines employing an HTS field coil are associated with a higher magnetic field density levels and a more compact volume compared to electric machines which have a copper coil [30][31][32][33]. The critical current, I C , of the HTS field coil at 77 K can be estimated based on data pertaining to the critical current degradation characteristics according to the external magnetic field of the HTS wire at 77 K [32].…”