A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

S. B. Kim, T. Kadota, J. H. Joo, H. Sano, S. Murase, S. H. Lee, J. P. Hong, H. M. Kim, Y. K. Kwon, Y. S. Jo

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall Jc degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.

Original languageEnglish
Pages (from-to)1756-1762
Number of pages7
JournalPhysica C: Superconductivity and its applications
Issue number20
Publication statusPublished - Nov 1 2010


  • HTS motor
  • Mechanical stress
  • Racetrack coil

ASJC Scopus subject areas

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


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