1. ® A MAGNETICALLY-GEARED COMPACT 3MW DIRECT DRIVE GENERATOR EWEC 2010

2. ® 2 Overview 1. Pseudo direct drive PDD ® 2. Wind generator development 3. Benefits for wind energy

3. ® 3 Magnetic gearing & PDD ®

4. ® 4 Video presentation

5. ® 5 Three components Two are free to rotate, the third is mechanically earthed High torque magnetic gear

6. ® 6 Field of inner magnets without pole-pieces 4 pole-pair spatial harmonic (fundamental)

7. ® 7 Harmonic at 27-4=23 Field of inner magnets with pole-pieces Original 4 pole-pair fundamental

8. ® 8 No pole-pieces

9. ® 9 With pole-pieces

10. ® 10 Improved reliability Improved efficiency Reduced maintenance No gear wear Lighter for large torques Inherent overload protection Unlikely to jam Reduced noise/vibration Magnetic gear benefits

11. ® 11 A combination of two magnetic transmissions

12. ® 12 Highest torque-density electrical machine Removes gearbox Overload protection Very high efficiency Requires little or no cooling High power factor Standard power electronic control PDD ® benefits

13. ® 13 3MW wind turbine PDD ® generator

14. ® 14 3MW PDD ® 3.8m diameter 1.8m length 40T mass

15. ® 15 Advanced DD PMG 3MW 5m OD 2.5m length 75 tonnes Geared DFIG 3MW Magnomatics PDD 3.8m OD 1.8 length 40 tonnes. Size reduction

16. ® 16 Annual energy output Taken from Garrad Hassan study

17. ® 17 Benefits for wind energy Removes gearbox -> increases turbine reliability High efficiency Light weight Low maintenance Torque fuse protects drivetrain Scalable for larger WTs

18. ® 18 Next steps Design, build and test 500kW demonstrator Evaluate technical and economic benefit Develop 3MW generator Test on turbine Certification and production engineering Develop 6-7MW generator for offshore