TY - JOUR
T1 - Conceptual Design and Numerical Analysis of 10 MW Fully Superconducting Synchronous Generators Installed with a Novel Casing Structure
AU - Komiya, Masataka
AU - Sugouchi, Ryota
AU - Sasa, Hiromasa
AU - Miura, Shun
AU - Iwakuma, Masataka
AU - Yoshida, Takashi
AU - Sasayama, Teruyoshi
AU - Yamamoto, Kaoru
AU - Tomioka, Akira
AU - Konno, Masayuki
AU - Izumi, Teruo
N1 - Funding Information:
Manuscript received September 24, 2019; accepted April 1, 2020. Date of publication April 23, 2020; date of current version May 22, 2020. This research was supported in part by the New Energy and Industrial Technology Development Organization (NEDO), in part by the Japan Society for the Promotion of Science (JSPS): Grant-in-Aid-for Scientific Research (JP18H03783 and JP19K14964), and in part by the Japan Science and Technology Agency (JST): Advanced Low Carbon Technology Research and Development Program (ALCA). (Corresponding author: Masataka Komiya.) Masataka Komiya, Ryota Sugouchi, Hiromasa Sasa, Shun Miura, Masataka Iwakuma, Takashi Yoshida, Teruyoshi Sasayama, and Kaoru Yamamoto are with the Institute of Superconductors Science and Systems, Kyushu University, Fukuoka 819-0395, Japan (e-mail: masktou@gmail.com; iwakuma@sc.kyushu-u.ac.jp).
PY - 2020/6
Y1 - 2020/6
N2 - Currently, feasibility studies on fully turboelectric propulsion systems for electric aircrafts are being conducted worldwide. A fully superconducting rotating machine can realize fully turboelectric propulsion systems with light weight and high power density. In the simple casing model considered in a previous study, the field winding forms a large percentage of the generator weight. Therefore, to reveal the relationship between the operation temperature of the field winding and output power density, we compared an inner cryostat model having a field winding operation temperature of 20 K with the simple casing model having a field winding operation temperature of 64 K in terms of the output power density, efficiency, and increasing temperature. The stator and rotor rooms of the inner cryostat model were insulated by introducing the vacuum layer. The inner cryostat casing structure can have a lower refrigerant gas temperature, e.g., 20 K. Consequently, the temperature of the simple model increased from 5.4 to 7.1 K and that of the inner cryostat model increased from 3.0 to 6.1 K. The simple and inner cryostat models' power densities were 18.8 and 21.7 kW/kg, respectively. Both models achieved 99% efficiency. No major difference was observed between both models in terms of efficiency and output power density.
AB - Currently, feasibility studies on fully turboelectric propulsion systems for electric aircrafts are being conducted worldwide. A fully superconducting rotating machine can realize fully turboelectric propulsion systems with light weight and high power density. In the simple casing model considered in a previous study, the field winding forms a large percentage of the generator weight. Therefore, to reveal the relationship between the operation temperature of the field winding and output power density, we compared an inner cryostat model having a field winding operation temperature of 20 K with the simple casing model having a field winding operation temperature of 64 K in terms of the output power density, efficiency, and increasing temperature. The stator and rotor rooms of the inner cryostat model were insulated by introducing the vacuum layer. The inner cryostat casing structure can have a lower refrigerant gas temperature, e.g., 20 K. Consequently, the temperature of the simple model increased from 5.4 to 7.1 K and that of the inner cryostat model increased from 3.0 to 6.1 K. The simple and inner cryostat models' power densities were 18.8 and 21.7 kW/kg, respectively. Both models achieved 99% efficiency. No major difference was observed between both models in terms of efficiency and output power density.
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U2 - 10.1109/TASC.2020.2989746
DO - 10.1109/TASC.2020.2989746
M3 - Article
AN - SCOPUS:85085647345
VL - 30
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 4
M1 - 9076878
ER -