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azipod
Azipod is the registered brand name for ABB Group's range of electric podded azimuth thrusters. Developed in Finland jointly by the shipbuilding company Masa-Yards and ABB, Azipod is a marine propulsion unit consisting of a fixed pitch propeller mounted on a steerable gondola ("pod") which also contains the electric motor driving the propeller.
== Concept ==
In the traditional azimuth thrusters such as Z-drive and L-drive thrusters, the propeller is driven by an electric motor or a diesel engine inside the ship's hull. The propeller is coupled to the prime mover with shafts and bevel gears that allow rotating the propeller about a vertical axis. This type of propulsion system has a long tradition throughout the 1900s and today such propulsion units are produced by a number of companies around the world.
In the Azipod unit, the electric motor is mounted inside the propulsion unit and the propeller is connected directly to the motor shaft. By avoiding the use of a traditional propeller shaft, the propeller can be further below the stern of the ship in a clear flow of water, thereby providing greater hydrodynamic and mechanical efficiency. Furthermore, it increases flexibility in the general arrangement of the vessel's power plant.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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