AC losses in HTS coils for high-frequency and non-sinusoidal currents

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Abstract

AC losses in racetrack coils that are wound of YBCO tapes are measured for sinusoidal and non-sinusoidal transport currents with fundamental frequencies up to 1 kHz. An electrical method to measure losses for non-sinusoidal currents is developed for this purpose. The measured losses are compared to the losses calculated by 2D finite element models with power-law material models. The frequency and waveform-dependency of the measured losses are shown and compared to the results of the models over a wide range of frequencies and waveforms. Finally, it is shown that the finite element models can accurately predict AC losses resulting from non-sinusoidal transport currents as are present in highly dynamic motors with AC armature coils.
Original languageEnglish
Article number095006
Number of pages8
JournalSuperconductor Science and Technology
Volume30
Issue number9
DOIs
Publication statusPublished - Sep 2017

Keywords

  • AC losses
  • finite element analysis
  • loss measurement
  • superconducting coils
  • type-II superconductors

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