| Project Detail |
No viable conventional solution is available for ~10 MW flight capable motors and generators. If power density and efficiency are maintained, the heat flux in electric machines goes up with power. This presents a thermal bottleneck at high power levels (> 1 MW). System level tradeoffs would lead to higher voltages at higher power, requiring thicker insulation, increased thermal resistance, and degradation in power density. An alternative to the conventional electric machine topologies is required to enable electric propulsion of commercial airliners. Superconducting machines are a promising approach, as they can achieve efficiencies above 99% and specific powers above 50 kW/kg. The size, weight, and efficiency of the cooling system required to maintain the superconducting coils at cryogenic temperatures presents a major challenge.
Project Innovation + Advantages:
Hinetics will develop and demonstrate a high-power density electric machine to enable electrified aircraft propulsion systems up to 10 MW and beyond. Hinetics’ technology uses a superconducting machine design that eliminates the need for cryogenic auxiliary systems yet maintains low total mass. The innovative concept features a sub-20 K Stirling-cycle cooler integrated with a low-loss rotor to maintain the SC coils below 30 K. This design could enable a 10 MW, 3000 RPM aircraft propulsion motor weighing less than 250 kilograms that rejects up to 10 times less total heat to the ambient environment (>99% efficiency) and magnetic fields that are an order of magnitude higher than conventional machines. A novel coil suspension and torque transfer system cuts the cryogenic heat load by a factor of 10 to streamline the cryogenic design without the need for external coolers. The higher efficiency eases aircraft-level thermal management challenges with a factor of six to ten reduction in total heat exhausted to the ambient.
Potential Impact:
This technology can enable electrification of commercial transport class aircraft with a range of power sources (batteries, fuel cells, turbo-electric with Jet-A, and hybrids) to help meet emissions targets set by the aviation industry and global agreements. |
