AC Three-Phase Axial Flux Motor With Magnetized Superconductors

Abstract

One of the most relevant topics in the development of trapped field superconducting motors is the requirement of a magnetization process of the superconducting pellets, previously to start operating the superconducting machine. This work deals with magnetization of an axially excited superconducting motor. We consider two ways to magnetize the eight YBCO bulks included in an eight poles disk shaped rotor: the so called Field Cooling (FC) and the Zero Field Cooling (ZFC) processes. Discussion of both procedures is reported in terms of the behaviour of the motor after magnetization is done. Measurement system and data concerning torque and load angle are also reported.

Torque Ripple Reduction in an Axial Flux High Temperature Superconducting Motor

“…These advantages have led to numerous research studies to introduce High Temperature Superconductor (HTS) technology into AFM's [2]- [4]. Most of these studies focused on the design and construction of hysteresis and reluctance motors using YBCO bulk parts made of single piece or several disks uniformly distributed around the rotor [3]. Thus, replacing permanent magnets for field-cooled bulk YBCO materials allows increasing the magnetic field in the air gap and achieve compacter full superconducting machines [5].…”