Comparison between Coreless and Yokeless Stator Designs in Fully-Superconducting Propulsion Motors

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Charalampos Manolopoulos
  • Paul Tuohy
  • Xiaoze Pei
  • Paul Miller
  • Mark Husband


Hybrid electric propulsion could be the solution to the ambitious environmental targets of the aerospace industry. Fully-superconducting machines have the potential to deliver the step-change in specific torque, power and efficiency capabilities required for large civil transport aircraft applications. However fully-superconducting machines are still in their infancy. This paper investigates the electromagnetic design of two different stator design concepts for an AC fully-superconducting machine for an aerospace distributed fan motor application. A benchmark aerospace specification of 1 MW was chosen and the design of a conventional permanent-magnet machine was used to assess the performance of the two equivalent fully-superconducting AC motor designs. Following the guidelines from an experimental study of the losses in a small AC stator prototype with MgB _2 coils, a fully-superconducting air-cored stator design and a new yokeless stator design are proposed. Both AC superconducting machine designs use superconducting bulk magnets mounted on a rotor core and an MgB _2 superconducting stator winding. This paper discusses the key design issues of the two stator layouts in relation to the current aerospace targets for efficiency and power density.

Bibliographical metadata

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
Publication statusAccepted/In press - 29 Apr 2020