Innovative solutions for high-power-density e-motors for aerospace propulsion

High power density in e-motors is essential for future developments of electrical propulsion. Values of 20kW/kg can be achieved using very-high-permeability electrical steel, high currents, high frequency and special cooling systems with critical CO2. All the above have to be used while ensuring that the fault operating rate stays at 1e-9 value. Rare earth magnets can be used, but are not absolutely necessary. Several solutions and configurations are investigated and presented: inner and outer rotor rare earth magnet motors, induction motors and switched reluctance motors. Proposals for new research directions for e-motors are considered in this presentation.