Our Generator

The GreenSpur Solution

GreenSpur’s innovative generator offers the wind and tidal industries a clear pathway to the elimination of Rare Earth risk. Our generator is based on a new modular axial-flux architecture. It uses ferrite magnets in place of the Rare Earth ones, which are used within existing radial-flux designs. It also uses aluminium coils in place of copper windings and composites materials to lightweight the design.

Our innovative axial-flux design is backed by 11 international patent filings.

Game-changing Benefits of our Technology

Lower Costs

LCOE reductions are achieved by using low-cost materials in place of more expensive ones. High-cost Rare Earth magnets and copper windings are replaced with low-cost ferrite alternatives and cheaper aluminium coils.


GreenSpur’s axial-flux design incorporates many innovate design features. The rotor and stator are arranged as discs along the axis of the machine, which opens up a greater surface area for our magnets and coils to interact. A simple air-forced cooling system maintains the operational temperature. Our Rare Earth-free magnets can safely operate at 140 degrees Celsius, so the thermal management of our generator is less challenging than for existing Rare Earth radial-flux designs.

Supply Chain Strengths

By moving to abundant and low-risk materials the GreenSpur generator eliminates the price and supply risks associated with Rare Earth magnets and copper windings.


The mining and processing of Rare Earth magnets is environmentally challenging. Hazardous and sometimes radioactive biproducts are generated as part of the production process. The use of low-risk Rare Earth-free magnets and aluminium materials enables the development of a long-term, environmentally friendly and sustainable production processes.

Our Axial-Flux Design

GreenSpur’s generator design is based around an axial-flux architecture, as opposed to the radial-flux architecture used in most motors and generators and the direct drive generators used in offshore wind turbines.

In conventional, radial-flux generators, the rotor (rotating part of the generator) and stator (stationary part) are concentric cylinders, with magnetic flux flowing between them. The flux lines flow to and away from the axis of rotation of the generator, as shown in “radial lines” in the left-hand diagram.

In an axial-flux generator, the rotor and stator are arranged as discs along the axis of the machine, and the magnetic flux flows parallel to this axis as “axial lines”, as shown in the right-hand diagram.

The Greenspur Design

The GreenSpur design is modular, with each module containing a rotor, into which the magnets are embedded, sandwiched between two stators into which the coils are placed and in which the current is induced.