Technical concept Clause Samples

Technical concept. An electric motor drives the propeller with constant rpm at any load case. Its advantage is a nearly constant efficiency at all load cases. Depending on the selected electric motor a gear box can be omitted. The frequency converter supplies the electric motor with a frequency and voltage amplitude variable AC voltage. The converter can be supplied by any AC or DC on board energy grid. The rotational speed of the electric motor is con-trolled by varying the output frequency. The main switch board distributes the energy from all sources to all loads. The loads are frequency converters at the propulsion system. The fuel cell provides the base load. The fuel is stored in the tank. Peak loads are absorbed by the battery which can be charged either by the fuel cell or via shore power. Figure 29 Fuel cell drive train