Loss characteristics of HTS coated conductors in field windings of electric aircraft propulsion motors
| Autor: | Markus Mueller, Hongye Zhang, Kevin Kails, Quan Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Field (physics) Metals and Alloys power density Mechanics Condensed Matter Physics dynamic loss 01 natural sciences Magnetic field Conductor Magnetization Electromagnetic coil frequency 0103 physical sciences Materials Chemistry Ceramics and Composites HTS rotating machines Skin effect Electrical and Electronic Engineering 010306 general physics Electrical conductor magnetisation loss |
| Zdroj: | Kails, K, Zhang, H, Mueller, M & Li, Q 2020, ' Loss characteristics of HTS coated conductors in field windings of electric aircraft propulsion motors ', Superconductor Science and Technology, vol. 33, no. 6, 064006, pp. 1-8 . https://doi.org/10.1088/1361-6668/ab89ed |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | High-temperature superconducting (HTS) coated conductors (CCs) are widely regarded as a promising candidate to enable very high power density motors. These machines operate at high rotational speeds, with some designs going up to 12 000 rpm. HTS CCs are applied to the field windings of these motors to increase the magnetic loading and hence the power density. Even though the superconducting field windings operate with a DC current, due to the magnetic field environment, losses are present. This paper examines the dynamic and total loss characteristics of YBCO-coated conductors in the frequency range relevant to high-speed motors for electric aircraft propulsion. A multi-layer model was created using the H -formulation and the losses for each layer were highlighted. For the first time, it was shown that the DC transport current region in the HTS layer shrinks as the frequency of the applied field increases due to the increased magnetisation current around the edges of the CC, which reduces the dynamic loss per cycle as the frequency increases. To fully understand the loss distribution in the HTS CC, the total loss in the conductor was investigated. For an applied magnetic field of 100 mT and 800 Hz, more than 30% of the total loss occurs in the copper layer due to the decreased penetration depth of the magnetic field and the skin effect. Results show that to accurately model and understand the losses in superconducting field windings, a multi-layer model should be used, since a significant proportion of loss shifts towards the copper stabilizers. Over all, it was shown that both the dynamic loss as well as magnetisation loss play a crucial role in the estimation of the loss in superconducting field windings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|