Fault-tolerant eVTOL propulsion architectures

eVTOL propulsion systems fall into two camps: multiple rotor systems with simplex power channels per rotor and low number of rotors each powered with a fault-tolerant electrical drive system. The paper will compare these two approaches and present architectures for fault-tolerant electrical drives. The route to achieving 10-7 per flight hour availability on a single output shaft electrical drive will be described. The presentation will be illustrated with practical results from radial- and axial-flux fault-tolerant electrical drives and will describe the design processes and tools that can be used.