NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Combined Analysis of NASA's High Efficiency Megawatt Motor and Its ConverterNASA’s High Efficiency Megawatt Motor (HEMM) is being developed to achieve the performance needed by single aisle class electrified aircraft. It is a 1.4 MW electric machine designed as a generator for NASA’s STARC-ABL concept vehicle. It has performance objectives of greater than 16 kW/kg electromagnetic specific power and efficiency of greater than 98%. The key enabling technology for HEMM’s high performance metrics is a superconducting rotor cooled by an integrated cryocooler. HEMM’s integrated cryocooler is being designed to only lift 50 W of heat at its target 50 K cold tip operating temperature. HEMM’s superconducting rotor therefore needs to have essentially zero electromagnetic losses in order to stay below the 50 W heat rejection limit of the cryocooler. This paper presents the combined analysis of HEMM and a preliminarily designed HEMM converter to analyze the rotor loss impact of several potential converter filter topologies. The analysis results point to interleaving and series inductance filters not being sufficient to suppress switching harmonic caused rotor loss. Paths forward to develop a converter to eliminate rotor loss are discussed.
Document ID
20210018169
Document Type
Conference Paper
Authors
Matthew Granger (Glenn Research Center Cleveland, Ohio, United States)
Aaron Anderson (Glenn Research Center Cleveland, Ohio, United States)
John M Maroli (Glenn Research Center Cleveland, Ohio, United States)
Thomas Tallerico (Glenn Research Center Cleveland, Ohio, United States)
Justin J Scheidler (Glenn Research Center Cleveland, Ohio, United States)
Date Acquired
July 2, 2021
Subject Category
Energy Production and Conversion
Meeting Information
2021 Electric Aircraft Technologies Symposium (EATS)(Virtual)
Funding Number(s)
WBS: 081876.02.03.10.01.01.06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert

Available Downloads

NameType HEMM_HEMM_Inverter_Full_Paper.pdf STI