Device for the roll stabilizing of a watercraft

A device for the roll-stabilizing of a watercraft in motion, at anchor, or at zero speed, and/or for influencing the course of the watercraft, the watercraft including a hull, the device comprising:

• a fin-carrying shaft on which a guide fin is disposed;
• and
• an electromechanical drive unit for changing an actual angle of attack of the guide fin in the water and configured to drive the fin-carrying shaft, the drive unit being disposed on the hull using a base and including a synchronous motor configured to drive the fin-carrying shaft using a reducing eccentric transmission;
• wherein the synchronous motor is controlled by power electronics that are controlled by a control and/or regulating device and includes at least one motor sensor that includes a rotor-position sensor for determining a rotor-position angle and a rotational speed sensor for determining a number n of rotations of the rotor shaft;
• and
• wherein an actual angle of attack of the fin-carrying shaft is directly capturable using a rotational angle sensor configured for detecting at least one full rotation of the fin-carrying shaft and the control and/or regulating device triggers a warning signal and/or a recalibration when a deviation between the calculated target angle of attack and the actual angle of attack measured using the rotational angle sensor exceeds a predetermined value.