US wave gets European patent
Award for Columbia Power’s Stingray device
US wave developer Columbia Power has received its first European patent for its Stingray device.
The patent covers the wave energy converter’s direct drive power take-off.
The Stingray uses two floats to capture wave energy and two rotary permanent-magnet generators to convert the energy into electricity.
Each float is directly coupled to its own generator, which enables a single energy-capture/conversion cycle.
A land-based test of the generator and air-gap control system is currently underway at the National Wind Technology Center in Colorado.
The rotary generator has a diameter of over 6m with a 4mm rotor-stator air-gap.
A large-scale Stingray will be deployed at the US Navy’s Wave Energy Test Site in Hawaii next year.
Image: Stingray wave device (InterMoor)