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The design of a powertrain for an eVTOL is a complex, multidisciplinary challenge whose solution is best approached as a constrained optimization problem. We use a motor and drive optimization tool based on both first principles and empirical models to examine the design space for a medium-sized eVTOL aicraft. The tool is used to perform optimizations based on continuous power requirements in conjunction with time-dependent mission profiles to achieve an optimal powertrain system weight given efficiency and diameter constraints. Additionally, efficiency and diameter sweeps are performed to illuminate the trades surrounding the "optimal" design point. Access to both detailed system-level optimizations and multi-dimensional sensitivity studies gives eVTOL aircraft designers unique and pivotal insights into the interaction between the propulsion system and the rest of the aircraft. A bespoke, integrated, approach also provides significant weight savings over a commercial off-the-shelf (COTS) solution.
Rahn et al. (Tue,) studied this question.