| 主权项 |
1. A ship's propulsion unit, comprising:
a shell structure configured to be arranged below a hull of the ship and immersible at least partly in water so that the shell structure will be at least partly surrounded by water; an electric motor for rotating a propeller outside the shell structure, the electric motor having a stator and a rotor for rotating in the stator; wherein the electric motor is arranged in a motor housing section of the shell structure so that the stator of the electric motor is form-fitted into a cylindrical section of the motor housing section of the shell structure; the cylindrical section having a cylindrical outer surface; and wherein the shell structure includes a support section having a lower end connected to the motor housing section of the shell structure and an upper end connected to the hull of the ship; a closed liquid cooling system having an inner space containing liquid, the inner space of the closed liquid cooling system being partly limited by the cylindrical outer surface of the cylindrical section of the motor housing section so that liquid in the inner space of the closed liquid cooling system will be in direct contact with the cylindrical outer surface of the cylindrical section of the motor housing section for exchanging thermal energy between the electric motor arranged in the cylindrical section of the motor housing section and liquid in the inner space of the closed liquid cooling system via the cylindrical section of the motor housing section; and the inner space of the closed liquid cooling system being partly limited by the shell structure of the propulsion unit so that liquid in the inner space of the closed liquid cooling system will be in direct contact with the shell structure of the propulsion unit for exchanging thermal energy between liquid in the inner space of the closed liquid cooling system and water surrounding the propulsion unit via the shell structure of the propulsion unit. |
