Experimental and analytical studies on electromagnetic behaviors of the GdBCO racetrack coils in a time-varying magnetic field

Yoon Hyuck Choi, Seungyong Hahn, Hyun Jin Shin, Dong Hyung Kang, Haigun Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The electromagnetic responses of two GdBCO racetrack coils, one wound without turn-to-turn insulation (NI) and the other wound with Kapton tape (INS), were examined in a time-varying magnetic field generated by a permanent magnet mounted on a rotor, which was driven by a separate motor. The currents induced by the electromotive forces were measured with respect to the rotating speed, number of turns, and the distance (d) between the permanent magnet and the coil. In the case of the NI coil, delay of the induced current was observed in a time-varying magnetic field (5 rpm, d= 10mm) due to anisotropy of the current path, suggesting that delay of the induced current will affect the electromagnetic induction by dB/dt. Consequently, the maximum induced current (0.35 A) of the NI coil was 8.2 times lower than that of the INS coil (2.88 A). Moreover, the induced currents in the INS coil increased with increasing rotating speed and number of turns, as well as with decreasing d, while those of the NI coil were barely affected due to the anisotropic current path. The experimental results showed good agreement with the simulated ones, which validates the proposed approaches involving an NI equivalent circuit model.

Original languageEnglish
Article number6963339
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - 2015 Jun 1

Fingerprint

Induced currents
coils
Magnetic fields
electromagnetism
magnetic fields
Permanent magnets
permanent magnets
Electromotive force
Electromagnetic induction
magnet coils
Equivalent circuits
Tapes
Kapton (trademark)
Insulation
electromotive forces
Anisotropy
Rotors
equivalent circuits
insulation
tapes

Keywords

  • electromagnetic responses
  • Electromotive forces
  • GdBCO racetrack coil
  • induced current
  • time-varying magnetic field

ASJC Scopus subject areas

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

Cite this

Experimental and analytical studies on electromagnetic behaviors of the GdBCO racetrack coils in a time-varying magnetic field. / Choi, Yoon Hyuck; Hahn, Seungyong; Shin, Hyun Jin; Kang, Dong Hyung; Lee, Haigun.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6963339, 01.06.2015.

Research output: Contribution to journalArticle

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