Methods of Estimating AC Losses in Superconducting MgB2Armature Windings With Spatial and Time Harmonics

Thanatheepan Balachandran, Noah J. Salk, Dongsu Lee, M. D. Sumption, Kiruba S. Haran

Research output: Contribution to journalArticlepeer-review


Recent developments in low ac loss MgB2 conductors are of significant importance given renewed interest in fully superconducting (SC) machines. Evaluating ac losses in fully SC machines is a critical step in developing feasible designs. In fully SC machines, SC armature windings experience non-uniform rotating magnetic fields, with spatial and temporal harmonics, which has an undisputed impact on ac losses. Existing ac loss models in the literature, which have been validated for stationary sinusoidal external fields, were extended to constant amplitude rotating fields. There is not enough research on validating the ac loss models for rotating non-uniform magnetic fields with harmonics. This paper proposes simplified methods to estimate the ac losses in conductors with non-uniform rotational applied magnetic fields experienced by the armature in a machine's environment. Extended analytical models are proposed to estimate the ac loss in single and multi-filament MgB2 conductors. The models are then compared against finite element analysis (FEA) results with Power Law loss estimation to evaluate model fidelity.

Original languageEnglish (US)
Article number4702407
JournalIEEE Transactions on Applied Superconductivity
Issue number6
StatePublished - Sep 1 2022
Externally publishedYes


  • Ac loss
  • analytical models
  • finite element analysis
  • harmonics
  • power law
  • superconducting machines

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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