No-insulation High Temperature Superconductor Winding Technique for Electrical Aircraft Propulsion

Yawei Wang, Fangjing Wen, Jianwei Li, Ján Šouc, Fedor Gömöry, Shengnan Zou, Min Zhang, Weijia Yuan

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)
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High-temperature superconductor (HTS) machine is a promising candidate for the electrical aircraft propulsion due to its great advantage in high power density. However, the HTS machine always suffers the problem of low thermal stability during quench. In this article, we apply a no-insulation (NI) coil technique on the rotor windings of HTS machines to enhance the stability and safety of the electrical aircraft. The NI HTS rotor windings experience ripple magnetic fields, which leads to induced eddy currents through turn-to-turn contacts. This induced current and accompanying losses will considerably affect the practicality of this technique. To study this issue, an equivalent circuit network model is developed, and it is validated by experiments. Then, analysis using this model shows that most of induced current flows in the outermost turns of the NI HTS coil because of skin effect, and lower turn-to-turn resistivity leads to higher transport current induced and more significant accumulation of turn-to-turn loss. A grading turn-to-turn resistivity is proposed to reduce the transport current induced and ac loss accumulation and meanwhile keep the high thermal stability of the NI HTS coil. Optimization of turn-to-turn resistivity is required when the NI HTS coil is applied in the machines' environments.

Original languageEnglish
Article number9110620
Pages (from-to)1613-1624
Number of pages12
JournalIEEE Transactions on Transportation Electrification
Issue number4
Early online date8 Jun 2020
Publication statusPublished - Dec 2020
Externally publishedYes

Bibliographical note

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Marie Sklodowska-Curie Fellowship under Grant 799902 and in part by the Grant Agency VEGA under Contract 1/0151/17.


  • Electrical Aircraft
  • superconducting machine
  • no-insulation coil
  • AC loss
  • ripple magnetic fields


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