First plastic wave energy converter that moves reliably with iglidur

• What was needed: Plain bearings for the bearing of the flaps in the Volta wave energy device
• Requirements: wear resistance, corrosion-free, insensitive to salt water, low moisture absorption, cost-effective
• Area of application: Renewable/hydro energy industry

PolyGen Ltd in Chesterfield specialises in the development of hard polyethylene wave energy converters. The Volta wave energy device is the world's first device for generating renewable energy from ocean waves that is predominantly made of plastic. What makes it special is its flexibility. During storms, the construction bends, making it more durable than existing designs.

The system works with several large flaps that convert the wave energy into hydraulic energy, which is then converted into electricity with the help of a turbine. Each flap is connected to the carrier system via two axes. The bearing points of the axes are located directly under the water surface - i.e. where the wave power is strongest. Due to the high mechanical stress and the corrosive salt water, it was impossible to use conventional metal bearings. The developers at PolyGen, who are themselves very familiar with the technical advantages of plastic, were open to bearings made of plastic from the start.

With the support of the bearing experts from igus®, the ideal solution was found: iglidur® bearings made of the material H370, which was specially developed for the wet area. The material is characterised by particularly low moisture absorption and high wear resistance under water. By using the readily available 40 mm flange variant, PolyGen was also able to considerably simplify the hinge design - a step that enabled additional cost savings.