A study on the loss in a superconducting magnet by the control current in a hybrid electro-magnetic suspension system

You Ho Kim, Jae Young Jang, Hyun Chul Jo, Sukjin Choi, Jin Bae Na, Chang Young Lee, Jung Bin Song, Haigun Lee, Tae Kuk Ko, Young Jin Hwang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A proto-type hybrid electro-magnetic suspension system (hybrid EMS system) was developed by Yonsei university . It is the first step of study on fundamental technology for advanced railroad system development. The proto-type hybrid EMS system consists of a ferromagnetic-core, a superconducting magnet (Bi-2223) for generating magneto-motive force (MMF) and a control coil for levitation control. This system has the characteristic of a control coil generating a magnetic flux to keep the levitation gap in constant value when the gap is attempted to be varied by external physical factors. In doing so, the induced current by the magnetic flux generate loss to the superconducting magnet inducing the possibility of an unstable system. Therefore, we have experimented and documented the results of evaluating the loss in the superconducting magnet generated by the control coil. This paper can be expected to suggest useful data for the design and operation of a hybrid EMS system.

Original languageEnglish
Article number6132409
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2012

Bibliographical note

Funding Information:
Manuscript received September 13, 2011; accepted January 13, 2012. Date of publication January 16, 2012; date of current version May 24, 2012. This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korea government Ministry of Knowledge Economy (20104010100590-11-1-000) and the National Research Foundation of Korea(NRF) Grant funded by the Korea government (MEST) (2011-0020401).


  • Cooling system
  • hybrid EMS system
  • iron-core

ASJC Scopus subject areas

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


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