Ship's steering unit whose angular position is servo-controlled by an electric motor

Inactive Publication Date: 2004-07-15
ALSTHOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0004] An object of the invention is to remedy those drawbacks by providing an electrically servo-

Problems solved by technology

That configuration suffers from the drawback of being less compact due to the need to have a larger number of motors equippe

Method used

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  • Ship's steering unit whose angular position is servo-controlled by an electric motor
  • Ship's steering unit whose angular position is servo-controlled by an electric motor

Examples

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Example

[0010] In the sole FIGURE, a ship's steering unit comprises a rudder 1 pivotally mounted in a mounting 2 that is secured to or integral with the structure of the ship. In this example, the rudder 1 is provided with a steering cone 1' connected to the mounting 2 via a rotary mechanical coupling 3 enabling the rudder to turn about a vertical axis AX along which it extends. The steering cone 1' passes through the structure of the ship in watertight manner to hold an underwater portion 1" which is shown in part only. The underwater portion 1" is fixed rigidly to the steering cone 1' and it forms the active portion of the rudder 1 to steer the ship on a certain heading depending on its position about the axis AX. The angular position of the rudder 1 about the axis AX is controlled by servo-controlling the angular position of the steering cone which is situated inside the ship.

[0011] In the example shown in the FIGURE, the diameter of the steering cone 1' decreases from top to bottom, and...

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Abstract

The ship's steering unit comprises a mounting which is part of the structure of the ship, and in which a rudder is pivotally mounted, the angular positioning of said rudder being servo-controlled by a motor. The motor is an electric motor comprising a stator rigidly fixed to said mounting, and a rotor rigidly fixed to said rudder. The steering motor is powered at variable frequency and at variable voltage, and it transmits the torque necessary for servo-controlling the rudder electromagnetically, i.e. without physical contact, thereby eliminating problems of wear. In addition, the steering unit is simplified by reducing the number of items of equipment making up said unit, thereby making it easier to install on board and contributing to making it more reliable.

Description

[0001] The invention relates to a ship's steering unit comprising a mounting which is part of the structure of the ship, and in which a rudder is pivotally mounted, the angular positioning of said rudder being servo-controlled by a motor. The invention applies more particularly to a large ship such as a cruise liner in which the servo-controlling of the position of the rudder is assisted by machinery.[0002] Conventionally, the rudder is constrained to move with at least two hydraulic motors that are fed with oil under pressure by a hydraulic power unit. The hydraulic power unit itself has two electric motors powered by an electricity network to provide redundancy in servo-controlling the rudder. More particularly, the top portion of the rudder, which is mounted to turn about a vertical axis, is provided with a toothed ring situated in a horizontal plane, and each hydraulic motor has an outlet gear meshed with said ring to transmit servo-control torque to the rudder. That solution ma...

Claims

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Application Information

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IPC IPC(8): B63H25/14B63H25/24B63H25/26
CPCB63H25/26B63H25/14
Inventor MONEUSE, NICOLAS
Owner ALSTHOM SA
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