Journal of Korea Society of Industrial Information Systems (한국산업정보학회논문지)

Korea Society of Industrial Information Systems (한국산업정보학회)
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Conceptual Design of an HTS Motor for Future Electric Aircraft

차세대 전기 항공기를 위한 HTS 모터의 개념 설계

  • Received : 2020.07.15
  • Accepted : 2020.08.12
  • Published : 2020.10.31
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Abstract

Conventional electric motors are not suitable for aircraft because of their large size and weight. High-temperature superconducting (HTS) motors have high current density, high magnetic field density, and low loss, so they can significantly reduce the size and weight compared to general electric motors. This paper presents the conceptual design and analysis results of HTS motors for electric propulsion in future aircraft. A 2.5 MW HTS motor with a rotational speed of 7,200 RPM was designed and the specific power (kW/kg) was analyzed. The operating temperature of the field coil of the HTS motor is 20K in consideration of LH2 cooling. The stator winding were connected in a multi-phase configuration and Litz wires were used to minimize eddy current losses. As a result, it was confirmed that the specific power of the motor is about 18.67 kW/kg, which is much higher than that of the conventional electric motor.

기존의 전기 모터는 큰 중량과 부피의 단점으로 항공기 적용에 적합하지 않다. 고온 초전도 (High-Temperature Superconducting: HTS) 모터는 전류 밀도와 자기장 밀도가 높으며 손실이 적어 일반 전기모터와 비교하여 크기와 무게를 크게 줄일 수 있다. 본 논문은 미래 항공기 전기 추진용 HTS 모터의 개념 설계 및 해석 결과를 제시한다. 회전속도가 7,200 RPM인 2.5 MW 용량의 HTS 모터를 설계하고 무게 대비 출력 비(kW/kg)를 분석하였다. HTS 모터 계자코일 (Field Coil)의 운전온도는 LH2 (Liquid Hydrogen) 냉각을 고려하여 20K을 선정하였다. 고정자 권선 (Stator Winding)은 다상 구성 (Multi-Phase Configuration)으로 연결하였고 와전류 (Eddy Current) 손실을 최소화하기 위해 Litz 선을 사용하였다. 결과적으로 모터의 무게 대비 출력 비는 약 18.67 kW/kg으로 기존 모터보다 훨씬 높음을 확인하였다.

Keywords

References

  1. Bolam, R. C., Vagapov, Y., and Anuchin, A. (2018), Review of Electrically Powered Propulsion for Aircraft, Proceedings of the 53rd International Universities Power Engineering Conference (UPEC) , Sep. 4-7, Glasgow, UK.
  2. Brelje, B., and Martins, J. (2019). Electric, Hybrid, and Turboelectric Fixed-Wing Aircraft: A Review of Concepts, Models, and Design Approaches, Progress in Aerospace Sciences, 104, 1-19. https://doi.org/10.1016/j.paerosci.2018.06.004
  3. Epstein, H. (2014), Aeropropulsion for Commercial Aviation in the Twenty-First Century and Research Directions Needed, American Institute of Aeronautics and Astronautics Journal, 52(5), 901-911. https://doi.org/10.2514/1.J052713
  4. European Environment Agency, European Aviation Safety Agency, and EUROCONTROL. (2016), European Aviation Environmental Report 2016. Luxembourg: Publications Office.
  5. Gohardani, A. S., Doulgeris G., and Singh, R. (2011). Challenges of Future Aircraft Propulsion: A Review of Distributed Propulsion Technology and Its Potential Application for The All Electric Commercial Aircraft, Progress in Aerospace Sciences, 47(5), 369-391. https://doi.org/10.1016/j.paerosci.2010.09.001
  6. Jansen R., Yaritza D. J., Kascak, P., Dyson, R. W., Woodworth, A., Scheidler, J. J., Edwards, R., Stalcup, E. J., Wilhite, J., Duffy, K. P., Passe, P., and McCormick, S. (2018). High Efficiency Megawatt Motor Conceptual Design, Proceedings of the 2018 Joint Propulsion Conference, Jul. 9-11, Ohio, USA.
  7. Kim, H. D., Perry, A. T., and Ansell, P. J. (2018). A Review of Distributed Electric Propulsion Concepts for Air Vehicle Technology, Proceedings of the 2018 AIAA/ IEEE Electric Aircraft Technologies Symposium, Jul. 9-11, Ohio, USA.
  8. Kuhn L. (2019). High Power Density 10 MW HTS-Generator for eAircraft, Proceedings of the 14th European Conference on Applied Superconductivity, Sept. 1-5, Glasgow, UK.
  9. Lee, S. (2019). AC Loss Characteristic Analysis of Superconducting Power Cable for High Capacity Power Transmission, Journal of the Korea Industrial Information Systems Research, 24(2), 57-63. https://doi.org/10.9723/JKSIIS.2019.24.2.057
  10. Martin, H. (2012). Electric Flight - Potential and Limitations, Proceedings of the Energy Efficient Technologies and Concepts of Operation, Oct. 22-24, Lisbon, Portugal.
  11. Naayagi, R. T. (2013). A Review of More Electric Aircraft Technology, Proceedings of the International Conference on Energy Efficient Technologies for Sustainability, Apr. 10-12, Nagercoil, India.
  12. National Academies of Sciences, Engineering, and Medicine. (2016). Commercial Aircraft Propulsion and Energy Systems Research: Reducing Global Carbon Emissions. Washington, DC: The National Academies Press.
  13. Sarlioglu, B., and Morris, C. T. (2015). More Electric Aircraft: Review, Challenges, and Opportunities for Commercial Transport Aircraft, IEEE Transactions on Transportation Electrification, 1(1), 54-64. https://doi.org/10.1109/TTE.2015.2426499
  14. Scheidler J. J., and Tallerico T. F. (2018). Design, Fabrication, and Critical Current Testing of No-Insulation Superconducting Rotor Coils for NASA's 1.4 MW High-Efficiency Megawatt Motor, 2018 AIAA/ IEEE Electric Aircraft Technologies Symposium, Jul. 9-11, Ohio, USA.
  15. Tuvdensuren, O., Go, B., Sung, H., Park, M., and Yu, I. (2019a). Characteristic Analysis of Modularized HTS Field Coils for a Superconducting Wind Power Generator According to Field Coil Structure, Journal of the Korea Industrial Information Systems Research, 24(2), 15-23. https://doi.org/10.9723/JKSIIS.2019.24.2.015
  16. Tuvdensuren, O., Go, B., Sung, H., and Park, M. (2019b). Structural Design and Thermal Analysis of a Module Coil for a 750kW-Class High Temperature Superconducting Generator for Wind Turbine, Journal of the Korea Industrial Information Systems Research, 24(2), 33-40. https://doi.org/10.9723/JKSIIS.2019.24.2.033
  17. Welstead, J., and Felder, J. (2016). Conceptual Design of A Singleaisle Turboelectric Commercial Transport with Fuselage Boundary Layer Ingestion, Proceedings on the 54th AIAA Aerospace Sciences Meeting, Jan. 4-8, California, USA.
  18. Zhang, X., Bowman, C. L., O'Connell, T. C., and Haran, K. S. (2018). Large Electric Machines for Aircraft Electric Propulsion, IET Electric Power Applications, 12(6), 767-779. https://doi.org/10.1049/iet-epa.2017.0639
  19. Zheng, X., and Wang, D. (2016). Torque Regulation of Multiphase Induction Motors Under Symmetrical Fault Conditionm IEEJ Transactions on Electrical and Electronic Engineering. 12(2). 1-8.