Abstract
For the development of electric propulsion aircrafts with light weight, low emission and high efficiency, MW-class fully superconducting synchronous machines operating at liquid nitrogen temperature were conceptually designed with REBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7-</sub> <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><sub>δ</sub></i> (REBCO) superconducting tapes in our previous studies. To verify the actualization of the structure and cooling method, a 1 kW-class prototype fully superconducting synchronous motor was designed and constructed in this study. The fixed armature was cooled with subcooled liquid nitrogen at 65 K. The rotor was cooled with helium gas. The pole number was two for the future high speed operation. The applicability of the complicated casing structure with three chambers into fully superconducting motor was also investigated from the viewpoint of thermal insulation. The operations as a motor up to 500 rpm and a generator demonstrated that the designed structure and cooling method were reasonable and effective for cooling the fixed armature and rotating field windings.
Highlights
I T IS predicted that the air traffic demand for all of the world in 2039 will grow up to 2.2 times larger than in 2019 [1]
The international air transport association aims to improve aviation fuel efficiency to reduce carbon emissions in 2050 to half of that in 2005 [3]. To achieve these purposes, replacing the existing propulsion system containing jet engines by the electric propulsion system is one of the promising solutions [4], [5] and many research groups are investigating the electric aircraft with superconducting rotating machines [6]–[10]
The armature windings and the field windings were cooled by the subcooled liquid nitrogen and the cool gas helium, respectively
Summary
I T IS predicted that the air traffic demand for all of the world in 2039 will grow up to 2.2 times larger than in 2019 [1]. The international air transport association aims to improve aviation fuel efficiency to reduce carbon emissions in 2050 to half of that in 2005 [3]. To achieve these purposes, replacing the existing propulsion system containing jet engines by the electric propulsion system is one of the promising solutions [4], [5] and many research groups are investigating the electric aircraft with superconducting rotating machines [6]–[10]. Both of field and armature windings are wound by REBa2Cu3O7-δ (REBCO, RE = Rare Earth, such as Y, Eu, Gd, etc.) superconducting wires. The motor was operated up to 500 rpm successfully
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