Community Research and Development Information Service - CORDIS

A radial piston hydraulic machine for wave energy devices

A fast hydraulic machine has been developed that uses radial rather than axial pistons. Variable displacement is achieved using electronic control without swash plate or bent axis geometry. Oil can be pumped to several different destinations and, at the same time, it can work as a motor taking oil from others. It has an enormous low pressure manifold and adjusts its own bearing clearances to suit different conditions of pressure. There is no churning loss and almost no compressibility loss. Theoretical calculations of its shear and leakage losses show high efficiency particularly at part load. It is intended for use in the power trans of wave energy plants but smaller versions may open new applications on land.

Reported by

University of Edinburgh
Kings Buildings Mayfield Road
EH9 3JL Edinburgh
United Kingdom
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