DIRECT DRIVES
DEVELOPING PLANS FOR
A MULTI-MW DD-PMG A new ferrite DD-PMG
Essex based GreenSpur Renewables is a new entrant to the direct drive permanent magnet generator (DD-PMG) market. The company has patented a novel axial flux design that uses ferrite to create the magnetic field. It embodies a number of innovations that make it possible to assemble a ferrite only DD-PMG with a similar mass and space envelope to current rare earth offerings. LCOE savings have been estimated at 0.5% by BVG Associates and there is potential to go further as the design is optimised.
DEVELOPMENT STATUS
The design has been proven at prototype level. A 2kW unit was demonstrated at Global Offshore Wind in Manchester in June 2016, where it attracted significant market interest. A Finite Element Analysis (FEA) model was built by the University of Cambridge, which can accurately model mass, output and costs of multi-MW units. A 75kW unit has just been built with grant support from OrbisEnergy, the offshore renewables support hub based in Lowestoft. This unit is schedule for testing at the Offshore Renewable Energy (ORE) Catapult in February 2017.
PLANS FOR MULTI-MW UNITS
Building on the success of its initial units, GreenSpur formed a collaborative development group with the ORE Catapult and Warwick Manufacturing Group (WMG), part of the University of Warwick. The team at WMG were formerly at the University of Cambridge and developed GreenSpur’s FEA model. The collaborative group has been
awarded £1.25m of grant funding from InnovateUK, which will be used to move the technology towards a fully optimised 1MW unit.
COMMERCIAL EXPLOITATION
The GreenSpur DD-PMG has been designed specifically for the offshore wind market. The company believes that its generator can help the market reach the point of ‘subsidy free’. This will be key to opening up the global market, which could expand to £300bn by 2030.
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www.windenergynetwork.co.uk
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