What do integrated electric propulsion do basically
Integrated electric propulsion (IEP) is an arrangement of marine propulsion systems in which gas turbines or diesel generators or both generate electricity which is then used to power electric motors that are responsible to move propellers.
IEP replaces traditional propulsion system like COGAG for ships which eliminates the need for clutches and reduces or eliminates the need for gearboxes by using electrical transmission rather than mechanical transmission of energy. It provides more control and can sometimes be even more energy efficient.
Combined gas turbine and gas turbine (COGAG) is a type of traditional propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined. It is mainly used in destroyers and high performance ships.
Combined diesel and gas (CODAG) is a type of traditional propulsion system for ships that need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes.
-------------------------------------------------------------------------------------------------------
While CODAG and COGAG use mechanical energy of the engine to drive the propeller, IEP converts mechanical energy of the engines to electric energy and then drives the propeller using electric meter.
This provides better control and efficiency.