Multi-Rotor device with a polygonal structure for the utilization of marine currents

The invention relates to a multi-rotor device with a polygonal structure, for harnessing sea currents, comprising an assembly of extractable generating units (1) and driving units or floats (2) supported by a main structure in the shape of a polygon and complemented by a stabilisation structure using lattices (20, 21) or guys (22), in the centre of which a central dome (7) can be arranged. The device is attached to the bottom by means of anchoring cables (10), the length of which can be regulated by means of winches (9). The driving units (2) have ballast tanks which change the drive and orientation of the device as they are filled or emptied. As a result of the combined action of ballasts and winches, the device rotates and orients itself autonomously when the tide changes, the rotors always operating with optimum orientation and depth according to the current.