Siemens is to eliminate costly rare-earth materials from its permanent magnet wind generators.
“Two rare earths are used in the magnet. one is difficult and costly to source, while the other is not,” said Henrik Stiesdal, CTO of Siemens Wind Power.
How this will be done is to be revealed late in June, at a seminar at CWIEME Berlin. Stiesdal said: “In my seminar I will explain how we have managed to decrease the share of the truly ‘rare’ rare earth and will eventually eliminate it from the magnets we make in a few years’ time.”
The firm has moved to permanent magnet generators to increase the reliability of its off-shore wind turbines – they can be driven directly by the rotor, eliminating the need for a gearbox. “These direct drive systems, powered by a permanent magnet generator, could run for years without maintenance – significantly increasing uptime,” it said.
Around half of the annual output of Siemens wind turbines now feature permanent magnet generators – they are incorporated into all new models as standard.
By only using affordable materials Siemens aims to make on-shore turbines directly competitive with fossil fuels in the next few years – and off-shore turbines within the next decade.
CWIEME Berlin a meeting place for the coil winding, insulation and electrical manufacturing communities. The dates are 24-26th June 2014, at the Messe Berlin.
Photo: Siemens has an order for two German offshore wind power plants: The company will supply 97 6MW 154m diameter wind turbines to the Danish energy provider Dong Energy. Total capacity for ‘Gode Wind 1′ and ‘Gode Wind 2′ is 582MW.
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