Trial test of a bulk-type fully HTS synchronous motor

Zhen Huang, Min Zhang, Wei Wang, T. A. Coombs

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


The world's first bulk-type fully high temperature superconducting synchronous motor (HTS-SM) was assembled and tested in our laboratory at the University of Cambridge. The fully HTS-SM was designed with 75 Y123 HTS bulks mounted on the surface of the rotor and six air core 2G HTS racetrack coils used for stator windings. We successfully applied a light fan load test for this fully HTS-SM at its operating temperature of 77 K. The detected decay of the trapped magnetic flux densities at the centre of the HTS bulks was up to 16.5% after 5 h of synchronous rotation. Due to the high current density of the HTS material, the ac stator field for the 2G HTS winding was 49.2% stronger compared with a comparable copper winding. In the meantime, we estimated that the efficiency was about 86% potentially under stable low frequency rotation at 150 r/min. The results show that the performance of this HTS motor is acceptable for practical applications.

Original languageEnglish
Article number4602605
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 23 Dec 2013


  • 2G HTS coil
  • field decay
  • fully high temperature superconducting synchronous motor (HTS-SM)
  • HTS motor efficiency
  • Y123 HTS bulk


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