GreenSpur Renewables

GreenSpur RenewablesThe Next Revolution in Wind Turbine Technology

The Next Revolution in
Wind Turbine Technology

Reducing the Levelized Cost of Energy (LCOE) remains a key objective for the offshore wind industry.

When it started its project in September 2014, GreenSpur was aware that there had been a market move towards DD PMGs to facilitate upscaling and stimulate cost reduction. However, the company was also aware that the market leading DD PMGs being developed were reliant on the use of scarce and expensive rare earth magnets.

Problems associated with using rare earth magnets. 

Almost 95% of global rare earth market production originates from China and is also in high demand from other rapidly expanding global industries. These include defence, aerospace, medical, computing, mobile phone and batteries for electrical vehicles. The 2015 annual production of the rare earth elements neodymium and dysprosium, which are used in the manufacture of the rare earth magnets is estimated at 35,900 tonnes and 1,902 tonnes respectively (European Commission JRC, 2011). By contract ferrite magnets are made from iron ore, an abundantly available material. It is estimated that worldwide reserves of iron ore amount to 800 billion tonnes (Minerals Education Coalition).

GreenSpur is the first company to develop a credible ferrite DD PMG.

High growth is forecast for the global offshore wind market, which is likely to create a strong demand for DD PMGs. To meet rising demand it is predicted that by 2025 DD PMGs could require a 35% of global rare-earth magnet production. This could potentially result in significant price hikes and long supply lead times, particularly if competing and more influential industries (e.g. defence) also require additional supplies of rare earth magnetic materials.

Introducing GreenSpurs Ferrite DD PMG

By using a low cost and abundantly available material capable of delivering an equivalent output at a comparable weight GreenSpur will significantly expand the future market for large scale DD PMGs. 

Key Technical Advantages:

  • Magnetically balanced axial design.
  • Optimised magnet / copper ratio.
  • Uses readily available bearings.
  • Insensitive to air gap.
  • Design eliminates cogging.
  • High Curie Point (460°C) – makes cooling easier and maximises use of generator footprint.
  • Worked with major suppliers to optimise material, configuration and sizing.
GreenSpur Renewables,
GreenSpur Renewables,