Experimental Validation of a High-Power Slotless Stator

An important thrust in current aerospace research is aircraft electrification, including propulsion system electrification. For an electrified propulsion system to provide net benefit over conventional propulsion, the electrical systems must meet high specific power, power density, and efficiency standards. This paper presents experimental validation of components of a megawatt scale permanent magnet synchronous motor targeting power density of 13 kW/kg and 96% efficiency. This demonstrates that it is possible to build a stator appropriate for this application. The results closely match the FEA analysis and increase confidence that the final motor will be capable meeting the design requirements. The results also highlight the importance of tight manufacturing tolerances to minimize circulating currents and associated losses.