Design of Helical Winding for Slotless Partially Superconducting Electric Machines for Aircraft Propulsion

• Published in: IEEE access Vol. 12; pp. 54182 - 54190
• Main Authors: Alvarez, Pablo, Paredes, Jesus, Satrustegui, Marco, Martinez-Iturralde, Miguel
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Air gaps; Aircraft propulsion; Coils (windings); Configurations; electric machine; Electric machines; Fly by wire control; Helical winding; high-power; high-temperature superconductor; High-temperature superconductors; Motors; Power system measurements; Propulsion; Skew angle; Stator windings; Superconductivity; Winding; Windings
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2024.3386956

This paper presents a promising winding technique which enables higher power-densities in partially superconducting electrical machines with a slotless stator, e.g., self-supporting windings. Firstly, the formulation for defining the skewing factor of the helical winding is given. Afterwards, the skew angle and how diverse winding configurations can be characterised as a function of this angle is explained, along with different parameters such as the skewing factor, the harmonic content of the magnetomotive force wave in the airgap or the resistance per phase of the winding. The sine-shaped winding, a particular case of helical winding, is shown, with which, thanks to the benefits of the additive manufacturing, a better electromagnetic performance is achieved. Finally, the implementation of the helical winding configuration in a slotless partially superconducting 2 MW high-power and high-voltage electric machine for electric aircraft propulsion is assessed, comparing the machine active part weight and their power density.