Arrangement for steering and supplying propulsion power to propulsion system

Abstract

An arrangement for steering and supplying propulsion power to a contra rotating propeller(s) (CRP) propulsion system in a marine vessel is disclosed. The arrangement can include a first propeller, a second propeller driven by an AC motor, and an AC generator. The AC motor and AC generator can have the same electrical frequency. Another electrical power source can be electrically connectable to the AC motor in parallel to the AC generator. A shaft of the second propeller is mounted rotatable in a support structure which is attached to a hull of the marine vessel, and a rudder is supported in a manner allowing pivotal movement of the rudder relative to the support structure.

1 . An arrangement for steering and supplying propulsion power to a contra rotating propeller (CRP) propulsion system in a marine vessel, which arrangement comprises: a first propeller driven by a rotatable power unit; a second propeller driven by an AC motor, whereby the second propeller will rotate in an opposite direction relative to the first propeller; and an AC generator coupled to a mechanical output shaft of the rotatable power unit to be driven by the rotatable power unit, the AC generator being electrically connected to the AC motor, wherein:
 (i) the AC motor and the AC generator have a same electrical frequency;   (ii) another electrical power source is provided which is configured to be electrically connectable to the AC motor in parallel to the AC generator;   (iii) a shaft of the second propeller is rotatably mounted in a support structure which is attached to a hull of the marine vessel; and   (iv) a rudder is supported in a manner allowing pivotal movement of the rudder relative to the support structure.   
     
     
         2 . Arrangement according to  claim 1 , wherein the rudder is supported by the hull of the marine vessel. 
     
     
         3 . Arrangement according to  claim 1 , wherein hubs of the first propeller and the second propeller form a continuous streamlined shape.