In this work the investigation and design of a Direct Drive Electrical Generator for the Seaquest Concept Converter is presented. It involves the sizing procedure of an innovative arc-shaped electrical generator, in which the flux-switching principle has been chosen, thanks to its high torque density, then its analysis, optimization and performance verification by FEA, and finally the study of the most suitable control strategies. A particular attention has been given to all the specificities this new particular generator presents: non-constant rotational speed, reciprocating motion, border effects. This arc-shaped generator has then been compared to a traditional rotating machine directly coupled with the shaft and moved by the pendulum.