<p>The era of flying vehicles as an eco-friendly mobility of future transportation will soon arrive. UAM, which refers to an urban transportation system that uses aircraft to transport people and cargo, requires electric aircraft called eVTOL using electric motors rather than conventional internal combustion engines. The key technology of eVTOL are ultra-high efficiency and ultra-high power, and stability above all else. An eVTOL with limited battery capacity requires high efficiency to improve mileage, besides it is top priority in stability. It must land safely through the operation of the remaining motors even if one and two motors fail. A double airgap PMSM selected in this study focused on the higher performance characteristics by geometric structure of permanent magnets. Simultaneously, the safety of PMSM is analyzed in terms of torque performance of the rotor consisting of permanent magnets and iron cores. It is accomplished by analyzing the torque performance according to the inner and outer width and the pole pitch of the permanent magnets for high efficiency and high output of the PMSM. It is also analyzed torque characteristics by the diameter of pin bolt that prevents separation from the permanent magnets and iron cores for safe operation of the PMSM. The development based on the feasibility was performed by actual performance tests through the manufacture and power test bench. The results of the study provide elaborate important information for the design rules of double airgap electric motors. Moreover, it will give the performance data of the application of various motors such as lift, propulsion, and tilt force so on applicable in eVTOL.</p>