A novel direct-drive ocean wave energy extraction concept with contact-less force transmission system

This paper describes the design and testing of a new rotary direct-drive ocean wave energy extraction system. The device employs a contact-less force transmission system (CFTS) to couple afloat to the power take-off (PTO) mechanism made up of a ball screw, unidirectional clutch and a permanent magnet generator. Comprehensive simulation, design and testing of both the force transmission system and the ocean energy extraction system are presented along with preliminary wave flume test results of the buoy in irregular waves. (C) 2007 Elsevier Ltd. All rights reserved.