Abstract: A tubular linear generator comprises an elongate translator (12), containing a series of permanent magnets (13, 14 . . . ) and one or more annular coils (not shown) contained within and affixed to a ferromagnetic sleeve (31). Relative movement between the translator and armature causes the generation of electricity in the coils. The sleeve is contoured in terms of permeability around its circumference at one or both its ends, as shown at (32), in order to reduce cogging forces between the sleeve and the permanent magnets along the translator.

Abstract: A wavefarm (10) comprises a multiplicity of wave energy converters, comprising linear generators (19, 20, 21) and (22) which are driven by floats immersed in the sea, (14). In normal wave conditions, all of the generators supply a land line (17) via a control unit (18). In the event of inclement conditions, one or more of the generators are switched to linear motors, and these are then powered by those generators remaining in the sea, to withdraw their floats into protective cavities (23). The process is repeated sequentially until all but the last one or few of the generators have withdrawn their floats. Finally, these last are withdrawn by connecting them to an alternate power source e.g. a battery, (24), again via the control unit (18).