TY - JOUR
T1 - Thermal-Electromagnetic Coupled Analysis Considering AC Losses in REBCO Windings at 65 K of 10 MW Fully-Superconducting Synchronous Generators for Electric Aircraft
AU - Sasa, Hiromasa
AU - Miura, Shun
AU - Miyazaki, Hiroshi
AU - Sasayama, Teruyoshi
AU - Yoshida, Takashi
AU - Yamamoto, Kaoru
AU - Iwakuma, Masataka
AU - Hase, Yoshiji
AU - Sasamori, Yuichiro
AU - Honda, Hirokazu
AU - Konno, Msayuki
AU - Izumi, Teruo
N1 - Publisher Copyright:
IEEE
PY - 2022
Y1 - 2022
N2 - A large AC loss is generated in armature windings composed of a REBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (REBCO, RE = rare earth, Eu, Gd, etc.) wire in a fully superconducting synchronous generator. In aircraft applications, liquid nitrogen is suitable for cooling windings because of its specific heat capacity and dielectric strength. The evaporation of liquid refrigerant significantly decreases the dielectric strength, which results in an increase in the risk of accidents by discharging. For safe operation, the temperature in the generator is set below the boiling point of nitrogen (~77 K). We calculated the temperature rise caused by the AC loss and others by applying a method that estimates the AC loss from the experimental results. This paper addresses the electromagnetic-thermal analysis in finite element method to calculate the temperature rise and proves the feasibility of a fully superconducting generator cooled by liquid nitrogen, that is, the temperature is maintained below 77 K. The output power is 10 MW. The temperature of liquid nitrogen was assumed to be 65 K, and its flow speed was set as a parameter. Additionally, we confirmed that designing a method that determines the number of parallel conductors of REBCO windings considering the temperature rise can enhance the output power density.
AB - A large AC loss is generated in armature windings composed of a REBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (REBCO, RE = rare earth, Eu, Gd, etc.) wire in a fully superconducting synchronous generator. In aircraft applications, liquid nitrogen is suitable for cooling windings because of its specific heat capacity and dielectric strength. The evaporation of liquid refrigerant significantly decreases the dielectric strength, which results in an increase in the risk of accidents by discharging. For safe operation, the temperature in the generator is set below the boiling point of nitrogen (~77 K). We calculated the temperature rise caused by the AC loss and others by applying a method that estimates the AC loss from the experimental results. This paper addresses the electromagnetic-thermal analysis in finite element method to calculate the temperature rise and proves the feasibility of a fully superconducting generator cooled by liquid nitrogen, that is, the temperature is maintained below 77 K. The output power is 10 MW. The temperature of liquid nitrogen was assumed to be 65 K, and its flow speed was set as a parameter. Additionally, we confirmed that designing a method that determines the number of parallel conductors of REBCO windings considering the temperature rise can enhance the output power density.
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U2 - 10.1109/TASC.2022.3160660
DO - 10.1109/TASC.2022.3160660
M3 - Article
AN - SCOPUS:85126715115
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
ER -