Kyushu University · Physics and Astronomy
Professor Hiromasa Sasa's research lab specializes in the development and optimization of high-temperature superconducting (HTS) materials and devices for next-generation electric propulsion systems, particularly for aerospace applications. The lab focuses on reducing AC losses in REBa₂Cu₃Oᵧ (REBCO) superconducting tapes—key components in fully superconducting motors and generators—through structural engineering such as laser scribing and multi-layer stacking. Their work emphasizes thermal management, electromagnetic performance, and system efficiency under real-world operating conditions, including conduction cooling and liquid nitrogen environments. The lab also investigates the influence of geometric parameters, such as interlayer spacing and tape configuration, on AC loss characteristics to enable lightweight, high-efficiency electric aircraft systems.
Figures are computed from collected data and may differ slightly.
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" x
The AC loss occurred in REBa2Cu3Oy (REBCO, RE = rare earth elements, Y, Eu, Gd) superconductor is serious problem in AC applications because it may cause a severe temperature rise of superconducting systems. Therefore, it is necessary to understand the AC loss property of REBCO superconducting tape in detail and to reduce that. As AC application such as motor, the tape is mostly stacked into multi-layer. Thus, understanding the relation between the number of the stacked tapes and the AC loss is
A large AC loss is generated in armature windings composed of a 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 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><sub>y</sub></i> (REBCO, RE = rare earth, Eu, Gd, etc.) wire in a fully superconducting synchronous generator. In aircraft
Abstract In this study, we focused on the dependence of the AC loss in REBa 2 Cu 3 O y (REBCO, RE = rare earth, Y, Eu, Gd) superconducting tapes stacked perpendicular to the tape face on the interval between the superconducting layers. The AC loss of the 2-layer stacked tapes with various interval in perpendicular field was investigated by pickup-coil method. The AC loss for external applied magnetic field, B m , below the penetration field, B p , increases with increasing the interval. In the c
For AC applications of high-temperature superconductors, such as REBa2Cu3Oy (REBCO, RE = rare earth) superconducting tapes, an AC loss is a great part of total heat load of cooling systems. In the case of conduction cooling, it may cause a serious temperature rise of the superconducting systems. Therefore, it is very important to reduce the AC loss in superconducting windings and grasp its properties under various conditions. For AC loss reduction, REBCO tapes should be scribed into a multifilam
Abstract The estimation of AC loss in REBa 2 Cu 3 O y (REBCO; RE = rare earth, such as Y, Eu, and Gd) superconducting tapes within superconducting synchronous motors and generators for electric aircraft is imperative during the design stage phase to optimize efficiency and cooling considerations. Our previous studies clarified the AC loss characteristics, focusing on estimating the AC loss in armature windings. While the magnetic field applied to the armature windings is exclusively as an AC fie
Accurate estimation of AC losses is crucial for designing superconducting motors with high output power, lightweight, and safety, particularly for aircraft applications. This study examined the AC losses in a horizontal array of 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<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns
A new launch system, designed to enhance the flight range and payload of an electric vertical takeoff and landing (eVTOL) aircraft, used a 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<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><sub>y</sub></i> (Rare-Earth Barium Copper Oxide, RE
To design a safe superconducting motor with high power density for aircraft applications, an accurate estimation of the AC loss in superconducting windings is required. This study investigates the AC loss characteristics of a two-dimensional array of 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<italic xmlns:mml="http://www.w3.org/1
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