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High Efficiency Megawatt Machine Rotating Cryocooler Conceptual DesignSome of the challenges associated with developing electric aircraft propulsion systems include developing powertrain components that are both efficient and light-weight. In particular, electric motors must simultaneously achieve high efficiency by minimizing electrical and mechanical losses while also achieving high specific power by increasing the torque and/or speed. Normally increasing torque or speed will increase electrical and mechanical losses. The High Efficiency Megawatt Machine (HEMM) minimizes electrical losses by incorporating a superconductor to enable increased current on the rotor. And the rotor spins in a vacuum to minimize thermal and mechanical losses. Some organizations have been developing superconducting rotors for similar reasons using either cryogenic fluid transfer systems, fully immersed cryogenic cooling, and in a few cases utilized built-in cryogenic cooling on the rotor using a Brayton or Stirling system but the implementation was too large or inefficient for effective motor integration. Instead, a new approach for cryogenically cooling the superconducting rotor coil with an embedded rotating cryocooler is presented that fits completely within the rotating shaft.

Document ID
Acquisition Source
Glenn Research Center
Document Type
Dyson, Rodger W.
(NASA Glenn Research Center Cleveland, OH, United States)
Jansen, Ralph H.
(NASA Glenn Research Center Cleveland, OH, United States)
Duffy, Kirsten P.
(Toledo Univ. Toledo, OH, United States)
Passe, Paul J.
(Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
September 6, 2019
Publication Date
August 24, 2019
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Meeting Information
Meeting: AIAA/IEEE Electric Aircraft Technologies Symposium
Location: Indianapolis, IN
Country: United States
Start Date: August 22, 2019
End Date: August 24, 2019
Sponsors: American Institute of Aeronautics and Astronautics (AIAA)
Funding Number(s)
WBS: 081876.02.03
Distribution Limits
Public Use Permitted.
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