NASA Glenn Research Center is investigating hybrid electric and turboelectric propulsion concepts for future aircraft to reduce fuel burn , emissions , and noise . Systems studies show that the weight and efficiency of the electric system components need to be improved for this concept to be feasible . However , advances in motor component materials such as soft magnetic materials , hard magnetic materials , conductors , thermal insulation , and structural materials are expected in the coming years , and should improve motor performance . This study investigates several motor types for a one megawatt application , and projects the motor performance benefits of new component materials that might be available in the coming decades .