Design considerations for an electrical machine propelling a direct driven turbo compressor for use in active high-lift systems

This paper presents the design approach of a power train used in an advanced high-lift system for future aircraft. Aircraft applications require an ultra-light and integrated design leading to an electrical machine with a high power to weight ratio of 2.82 kW/kg. To achieve additional high lift during take-off and landing, air is blown out at the back flaps of the aircraft wings using a turbo compressor which is directly driven by an inverter-fed electrical machine. The design of the power train and the electrical machine in particular is discussed under different aspects, e.g. the electromagnetic design and the mechanical demands including the selection of a feasible rotor armour. This paper identifies the interfaces between the different factors and describes their dependencies.