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High-Temperature Superconducting Generators for Direct Drive Applications

High-Temperature Superconducting Generators for Direct Drive Applications. o.keysan@ed.ac.uk Institute for Energy Systems The University of Edinburgh. OZAN KEYSAN. December 2010. M. Lesser, J. Müller, “Superconductor Technology – Generating the Future of Offshore Wind Power,”. Overview.

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High-Temperature Superconducting Generators for Direct Drive Applications

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  1. High-Temperature Superconducting Generators for Direct Drive Applications o.keysan@ed.ac.uk Institute for Energy Systems The University of Edinburgh OZAN KEYSAN December 2010

  2. M. Lesser, J. Müller, “Superconductor Technology – Generating the Future of Offshore Wind Power,” Overview • Larger Offshore Wind Turbines (>5MW) • Gearboxes unfeasible • Direct Drive • Low Speed – High Torque • More Reliable • High Generator Mass • High Installation Cost

  3. Superconducting Generators • 50% of the mass of DDPM • High Efficiency • Reliability??? • Cryocooler + Coupler • Quench • Availability • Cooling Time • Maintenance Period Mass(PM)=0.025.Torque Mass(HTSG)=0.011.Torque+45

  4. Types of HTS Machines • Rotating DC Superconducting Field • Most Common Type • Transient Torques on HTS wire • Cryocooler Coupler + Brushes  Low Reliability • Cooling Times • Magnetized Bulk HTS • Very Difficult to Handle • Demagnetization • All Superconducting Machines • AC Losses on HTS wire

  5. Homopolar HTSG • +Single Stationary SC Coil • No Cryogenic Coupler • No Brushes • No Transient Torque on SC • Simplified Cooling, Isolation • +DC Field • No AC losses • Maximized Current • -Homopolar Flux Density • Reduced Power Density

  6. Bipolar Linear HTSG • Double HTS Field Winding • Bipolar Flux Distribution • High Power Density • Suitable for WECs

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