Abstract: The present invention relates to a propeller drive arrangement for vessels used in water-borne traffic, and specifically to a propeller drive arrangement containing a propulsion unit, and to such an arrangement, which contains a propulsion unit, which is turnable relative the hull of the vessel. Particularly the present invention relates to a system and a method for braking a motor of a propulsion unit. The solution for braking the propulsion unit according to the present invention is based on short-circuiting a permanently magnetized motor.

Abstract: The invention relates to a ship's propulsion and steering arrangement surrounded by water comprising an electric motor in a chamber, a propeller shaft associated with the electric motor having a propeller fitted outside the chamber, and a pressure source for pressurizing the chamber with air or some other pressurizing medium. The invention also relates to a method for managing fluid flows in the propulsion and steering arrangement of the aforementioned kind, wherein the chamber is sealed against the water pressure from outside and against other compartments of the ship. The chamber is pressurized by means of a flowing medium, monitoring of the pressure in the chamber is performed, and the composition of the medium escaping from the chamber in a controlled manner is monitored. Further, the invention comprises a method for improving the cooling by means of a pressurized gaseous medium.

Abstract: The present invention relates to a propeller drive arrangement for vessels used in water-borne traffic, and specifically to a propeller drive arrangement containing a propulsion unit, and to such an arrangement, which contains a propulsion unit, which is turnable relative the hull of the vessel. Particularly the present invention relates to a system and a method for braking a motor of a propulsion unit. The solution for braking the propulsion unit according to the present invention is based on short-circuiting a permanently magnetized motor.

Abstract: The invention relates to a ship's propulsion and/or azimuth steering arrangement surrounded by water, said unit comprising an electric motor (5) in a chamber (4) formed by the unit walls, a propeller shaft (7) associated with the electric motor having a propeller (8) fitted outside the chamber (4). Arrangement includes means (12, 17) for pressurizing the chamber with air or some other pressurizing medium, the thermal conductivity of which increases with the pressurization. The invention also relates to a method for managing fluid flows in the propulsion and/or steering unit of the aforementioned kind, wherein the chamber (4) is sealed (10, 16, 26) on the one hand against the water pressure from outside and on the other hand, correspondingly, against other compartments (11, 15) of the ship.

Abstract: The present invention relates to an installation arrangement for a ship's propulsion unit comprising a modular motor unit (1) located outside the ship's body. Said motor unit comprises a motor (25) and a propeller (5) and it is intended to be connected to a structure (3) connected to the ship. At the end (7) opposite to said propeller (5) said motor unit (1) comprises fitting means arranged for fitting said motor unit (1) longitudinally to corresponding fitting means (6, 12) arranged at said structure (3) connected to the ship. The present invention also relates to a method in this context, according to which method said motor unit (1) is fitted, by the use of a longitudinal displacement in the direction of the motor's shaft (26), to a fitting piece comprising a connector plug means (12) which co-operates with corresponding means at said motor unit for supplying electrical power to the motor.