Compact HTS Motor Designs Especially Useful to Be Cooled by Liquid Hydrogen

High-temperature superconductor (HTS) paved the way to power devices operated at elevated temperatures (e.g., LN$_{2}$). This reduced the required cooling efforts such that electric motors became an option for a number of applications. Nowadays, the consideration of liquid hydrogen as a fuel in fuel-cell electric drivetrains is offering a temperature level of from 20 to 30 K without additional cooling efforts. In these vehicle applications, the “for-free” cooling enables new concepts in electric machines. The disk-up-down assembling coil topology is introduced in this work for application in both fully and partially superconducting motors. With significant electromagnetic characteristics tailored for HTS motor design, this novel topology facilitates exploration of winding configurations in HTS motors. Preliminary results from our investigations are presented herein.