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Risk Reduction Testing of Superconducting Coils for the High Efficiency Megawatt MotorSecond generation high temperature superconducting coils provide a very attractive level of performance for use in the field winding of electric machines for aircraft. Aside from maintaining these coils at cryogenic temperatures, much care must be taken to prevent damaging these relatively fragile materials due to excessive stress. Thermal stresses due to temperature cycling and mechanical stresses due to centrifugal forces are the most critical for the High Efficiency Megawatt Motor. This paper summarizes two test campaigns that were undertaken to reduce the risks posed by these loads. In one campaign, several superconducting coils were fabricated, thermally cycled up to 50~times, and electrically tested in liquid nitrogen to assess the change in superconductivity metrics throughout thermal cycling. In the other campaign, a full-scale superconducting coil was fabricated, a test article was designed to produce a representative stress environment in the coil, the test article and coil were rotated at room temperature up to a speed of 11,800~rpm, and the superconductivity metrics were measured in liquid nitrogen before and after each rotation. The experimental results demonstrate that the superconducting coils manufactured in house can survive both thermal cycling and high speed rotation with no appreciable degradation in superconducting performance.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Justin J. Scheidler
(Glenn Research Center Cleveland, Ohio, United States)
Thomas F. Tallerico
(Glenn Research Center Cleveland, Ohio, United States)
William Torres
(Wolf Creek Federal Services )
Wesley Miller
(HX5, LLC)
Date Acquired
November 24, 2021
Subject Category
Mechanical Engineering
Meeting Information
Meeting: 2022 AIAA SciTech Forum
Location: San Diego, CA & online
Country: US
Start Date: January 3, 2022
End Date: January 7, 2022
Sponsors: American Institute of Aeronautics and Astronautics
Funding Number(s)
WBS: 081876.
Distribution Limits
Public Use Permitted.
Technical Review
NASA Technical Management
partially superconducting electric machine
electrified aircraft
high temperature superconductors
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