AC loss in MgB2-based fully superconducting electric machines
Feddersen, Matthew T
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https://hdl.handle.net/2142/97723
Description
Title
AC loss in MgB2-based fully superconducting electric machines
Author(s)
Feddersen, Matthew T
Issue Date
2017-04-24
Director of Research (if dissertation) or Advisor (if thesis)
Haran, Kiruba S.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Electric machines
Motor
Generator
Superconducting
AC loss
MgB2
Abstract
Superconducting electric machines have shown potential for dramatic increases in specific power for applications such as offshore wind generation, turbo-electric distributed propulsion in aircraft, and ship propulsion. Superconductors exhibit zero loss in dc conditions, though ac current produces considerable loss due to hysteresis, eddy currents, and coupling. For this reason, many present designs for such machines are partially superconducting, meaning that the dc field components are superconducting while the ac armature coils are normal copper conductors. A fully superconducting machine would involve both superconducting field and armature components for higher specific power, though this would introduce the previously mentioned ac losses. This research aims to characterize the expected losses in the components of fully superconducting machines based on partially superconducting designs described in prior work. Various factors are examined, such as motor geometry and operating frequency, and two low-loss designs are proposed based on the analysis.
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