Concept

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The Subwave turbine consists of a torpedo-shaped body hanging vertically into the sea from a strong cable connected to a buoy floating at the sea surface. Because of the connection to the buoy the turbine will move up and down in concert with the buoy movements when it is affected by waves.

The turbine body has two rotating rings, each of them directly connected to the rotor of an electric generator. Long wings attached to the rings will turn them around when the turbine moves vertically in the water. The wings are made of a flexibel polymer plastic designed to ensure unidirectional rotation.

A main point of this construction is that the turbine should be located at a depth that is at least half the maximum wavelength in the sea area where it is deployd. Here, the turbine operates in a virtually stagnant body of water. It is therefore only the buoys that have to withstand extreme weather conditions occuring at the surface. Buoy size shall be adapted so that it has buoyancy to raise the turbine fully under normal conditions, but only partially when the waves are very large. This will shield the system for the heaviest strains, while energy production will go on still.

The Subwave turbine is built around a strong hollow shaft. The yellow turbine parts in the figure are fixed to this shaft, while the rotating rings with wings and generator rotors revolve on water-lubricated bearings. The rotors have permanent magnets. Rotor and stator are moulded into plastic and will operate in wet condition. The generated current is fed via cable through the hollow shaft and further along the suspension structure.


The connection between the units is so deep that service vessels can operate in the field.

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