A Homopolar HTSG Topology for Large Direct-Drive Wind Turbines

Ozan Keysan, Markus Mueller

Research output: Contribution to journalArticlepeer-review


For offshore wind energy, there is a trend toward larger wind turbines. The increased mass of a power-takeoff system increases the installation cost of the turbine. Direct-drive superconducting generators have the potential to reduce the installation cost of wind turbines. For a successful entry to the offshore-wind-energy market, a high-temperature superconducting generator should be as reliable as conventional generators. It is proposed that a stationary superconducting direct-current-field winding may increase the reliability of the generator. An axial-flux homopolar generator topology is proposed to be used in low-speed high-torque applications. The topology is modified by using two superconducting field windings to obtain a bipolar flux-density distribution for higher power density. Different core types and dimensions were examined to find the most suitable design, and a conceptual design of a 6-MW 12-r/min generator is presented.
Original languageEnglish
Pages (from-to)3523 - 3531
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - Oct 2011


  • Direct drive
  • Homopolar generator
  • offshore wind
  • superconducting generator


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