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TECHNOLOGIES ELECTRIC PROPULSION ARCHITECTURES AND APPLICATIONS Safran is developing electric propulsion technologies for numerous platform types - some of which herald a whole new approach to civil aviation. Using the same technological building blocks, the company is positioned to address wide- ranging needs and markets. Air taxis The age-old dream of the “flying car” is now within reach! Multi-rotor VTOLs able about to carry four passengers could become a reality in the next few years, with numerous projects already in progress worldwide. Safran is involved in some initiatives that are already at an advanced stage, like the Bell Nexus. While it’s hard to imagine these aircraft becoming as popular as automobiles, they could serve as a viable alternative in certain areas — like air taxis in and around our congested cities, or air ambulance/medevac platforms, taking advantage of their speed, reliability and quieter operation. For the same reasons, the defense community is also taking an interest for logistics or special missions. Potential architecture: distributed hybrid-electric propulsion In this diagram, the amount of power needed for propulsion is optimally adjusted at each flight phase between the turbogenerator (turbine coupled to an electric generator) and a battery or other power source. In the case of air taxis carrying one or two passengers over shorter distances, propulsion could be all- electric (see the architecture on page 22) 20 21 50,000 to 100,000 AIRCRAFT IN SERVICE WITHIN 20 YEARS The market for new air mobility estimated by Safran 3 Energy management 4 Electric motors Powered by the turbogenerator, batteries or a combination of both 5 e-Propellers - Each powered by an electric motor - Provide lift, forward thrust and flight control 1 3 2 4 5 4 5 1 Turbogenerator Gas turbine driving an electric generator 2 Batteries Main or auxiliary power source, depending on the flight phase - Controls power ratio between the turbogenerator and batteries “Smart” distribution of electricity from the various power sources to the propulsive and non-propulsive systems Ensures the electric network is stable and protected - -PDF Image | SAFRAN AND AVIATIONS ELECTRIC FUTURE
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