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A MAGNETICALLY-GEARED COMPACT 3MW DIRECT DRIVE GENERATOR

EWEC 2010

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Overview

1. Pseudo direct drive PDD®

2. Wind generator development

3. Benefits for wind energy

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Magnetic gearing&

PDD®

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Video presentation

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• Three components• Two are free to rotate, the third is mechanically earthed

High torque magnetic gear

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0

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1 3 5 7 9 11 13 15 17 19 21 23 25 27 29

Harmonic number

Nor

mal

flux

den

sity

(T

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-0.4-0.3-0.2-0.10.00.10.20.30.4

0 100 200 300

Angular position (degrees)

Nor

mal

flux

den

sity

(T)

Field of inner magnets without pole-pieces

4 pole-pair spatial harmonic (fundamental)

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-0.7-0.5-0.3-0.10.10.30.50.7

0 100 200 300

Angular position (degrees)

Nor

mal

flux

den

sity

(T)

0

0.1

0.2

0.3

0.4

0.5

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29

Harmonic number

Nor

mal

flux

den

sity

(T

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Harmonic at 27-4=23

Field of inner magnets with pole-pieces

Original 4 pole-pair fundamental

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No pole-pieces

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With pole-pieces

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• 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

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A combination of two magnetic transmissions

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• 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

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3MW wind turbine PDD® generator

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3MW PDD®

• 3.8m diameter • 1.8m length • 40T mass

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Advanced DD PMG 3MW5m OD 2.5m length75 tonnes

Geared DFIG 3MW Magnomatics PDD 3.8m OD 1.8 length40 tonnes.

Size reduction

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Annual energy output

Taken from Garrad Hassan study

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Benefits for wind energy

• Removes gearbox -> increases turbine reliability

• High efficiency

• Light weight

• Low maintenance

• Torque fuse protects drivetrain

• Scalable for larger WTs

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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