Devices and methods are disclosed related to electric propulsion drives for watercraft. In some embodiments, an electric drive includes an active cooling loop facilitated by a rotating electric motor pumping a coolant through a mast and a housing of the electric drive. The mast can be provided with a separation wall to separate and guide streams of cooler and hotter coolant. The motor and an ESC can be cooled by the coolant. In certain embodiments, the electric drive includes a rotor jacket that substantially surrounds an external rotor of an electric motor; the rotor jacket substantially reduces unwanted eddy currents, and thereby allows the use a large motor and a housing with a smaller external diameter, which reduces hydrodynamic drag. In one embodiment, the external rotor is coupled directly, without intermediary gearing, to a propeller.

Provided is a synchronous electrical machine that includes a machine housing having a stator and a rotor lodged in the stator, the rotor being separated from the stator by an airgap, and the machine housing dissipating thermal losses generated by the stator. The stator having stacks of laminations and at least one channel extending along a longitudinal direction of the stator and formed in the laminations, two adjacent stacks of laminations being separated by pins or spacers to form an extraction duct connected to the channel, the machine housing further having an extraction opening so that a fluid injected in the air gap at the ends of the stator flows in the extraction duct and in the channel, and is extracted from the machine through the opening to cool the stator and the rotor.

The present disclosure relates to the field of outboard engines, particularly to a direct-drive electric outboard engine and an outboard engine system for alleviating the problem of the existing outboard engines, i.e., incapability of simultaneously meeting requirements on rev and torque of different types of ships. The direct-drive electric outboard engine includes an external rotor mechanism and a stator mechanism; wherein the external rotor mechanism includes an external stator and an impeller; the external rotor is located outside the stator mechanism; and the impeller is located outside the external rotor.

A planing boat including: a hull having a boarding area; a screw unit having a screw, and configured to be rotatable with respect to the hull so that the expulsion direction of a water current by the screw can vary by 360 degrees; and a direction change mechanism having a turning drive force source, and configured to change the expulsion direction by rotating the screw unit with respect to the hull with a drive force of the turning drive force source.

The propulsion unit includes a frame construction having an upper portion forming a support arm protruding from a hull of the vessel and a lower portion forming a longitudinal compartment provided with a propeller shaft having at least one propeller attached thereto, and a first electric motor driving the propeller shaft. The method includes measuring vibrations of the propulsion unit with at least one measuring device, forming a first auxiliary torque control signal based on the measured vibration signal, adding the first auxiliary torque control signal to a first torque control signal produced by a first torque controller of the first electric motor. The first auxiliary torque signal acts against the measured vibrations.

The disclosed assembly (E) comprises a housing (4) and a stator (29) inserted inside a cylindrical cavity in said housing (4). Said assembly comprises a means for point-to-point attachment (40, 46) of the stator (29) to the housing (4).

A naval azimuth propulsion system including an electric motor, a propeller operatively connected to the electric motor to rotate about a relative central axis, an annular nozzle positioned coaxially around the propeller, elements for supporting the motor and the propeller, these elements being connectable to the hull of a ship, first magnetic shielding means designed to shield the magnetic field generated by the electric motor during its operation.

A method for operating a propulsion device having a propulsor with a propeller, the propulsion device having a base coupled to a marine vessel and being configured to propel the marine vessel in water. The method includes moving the propulsor from a deployed position towards a stowed position, where the propulsor is closer to the marine vessel in the stowed position than in the deployed position, and where the propulsor is configured to propel the marine vessel in the deployed position. The method further includes rotating the propeller so as to fit between sides of the base coupled to the marine vessel when the propulsor is in the stowed position.

The arrangement includes at least one steering electric motor rotating the propulsion unit via a force transmission arrangement. The force transmission arrangement includes a differential including a first shaft connected to the steering electric motor, a second shaft connected to the propulsion unit, and a third shaft connected to a brake device. The third shaft is locked from rotation when a torque produced by an external force on the propulsion unit is below a threshold value, whereby power is distributed only from the steering electric motor to the propulsion unit or vice a versa. The third shaft is allowed to start rotating when the torque produced by the external force on the propulsion unit exceeds the threshold value, whereby power is distributed from the steering electric motor to the rotation of the propulsion unit and to the brake device or from the rotation of the propulsion unit to the steering electric motor and to the brake device.

The invention relates to the field of shipbuilding and more specifically to the screw propeller for a pod drive of a vessel, particularly an ice-going vessel, providing movement both ahead and astern in icy conditions where the ice is traversable, while also providing steering for the vessel, and to a pod drive comprising said screw propeller. To reduce the weight, and consequently the cost, of the pod drive, the screw propeller comprises a propeller hub, made so that it can be rigidly attached to the conical tailpiece of the propeller shaft, and screw propeller blades, each comprising a blade foil and a blade flange made in one piece, mounted on the propeller hub. The blade foil passes into the blade flange via a fillet joint forming the weakest portion for the possible destruction of the blade in the cross section of its foil, located immediately adjacent to the fillet joint. The outer surface of the blade flange has a profile, in its meridional cross section, curved inwards towards to the propeller axis, to reduce the distance from said blade foil cross section to the propeller axis.