Synchronous electrical machine and boat comprising such a machine

The synchronous electrical machine comprising:

• a stator and a wounded rotor, the stator comprising a plurality of phases, each phase comprising a plurality of coils connected together and a plurality of magnetic stator pole cores fixed on a stator frame and evenly distributed along a stator diameter, each coil being wounded around a different magnetic stator pole core to form a magnetic stator pole, each phase comprising a same number of magnetic stator poles, the magnetic stator poles of each phase being disposed in the stator frame to form a concentric winding stator, characterized in that the rotor comprises a plurality of magnetic rotor pole cores evenly distributed around the rotor and rotor coils, each rotor coil being wounded around a different magnetic rotor pole core to form a magnetic rotor pole;
• wherein each magnetic stator pole core of the plurality of magnetic stator pole cores comprises a plurality of magnetic elements, two adjacent magnetic elements of the plurality of magnetic elements being separated by an air gap being defined between a magnetic rotor pole core of the plurality of magnetic rotor pole cores and the two adjacent magnetic elements of the plurality of magnetic elements, forming a radial cooling duct.