AC Loss Analysis of MgB2-Based Fully Superconducting Machines

M. Feddersen, K. S. Haran, F. Berg

Research output: Contribution to journalConference articlepeer-review


Superconducting electric machines have shown potential for significant increase in power density, making them attractive for size and weight sensitive applications such as offshore wind generation, marine propulsion, and hybrid-electric aircraft propulsion. Superconductors exhibit no loss under dc conditions, though ac current and field produce considerable losses due to hysteresis, eddy currents, and coupling mechanisms. For this reason, many present machines are designed to be partially superconducting, meaning that the dc field components are superconducting while the ac armature coils are conventional conductors. Fully superconducting designs can provide increases in power density with significantly higher armature current; however, a good estimate of ac losses is required to determine the feasibility under the machines intended operating conditions. This paper aims to characterize the expected losses in a fully superconducting machine targeted towards aircraft, based on an actively-shielded, partially superconducting machine from prior work. Various factors are examined such as magnet strength, operating frequency, and machine load to produce a model for the loss in the superconducting components of the machine. This model is then used to optimize the design of the machine for minimal ac loss while maximizing power density. Important observations from the study are discussed.

Original languageEnglish (US)
Article number012026
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
StatePublished - Dec 30 2017
Event2017 International Cryogenic Materials Conference, ICMC 2017 - Madison, United States
Duration: Jul 9 2017Jul 13 2017

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering


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