With the continuous development of modern multielectric aircraft technology, higher requirements are put forward for the aviation power supply system. According to the requirements of high reliability, high power density and large power supply capacity of aviation starter generator, a high speed doubly salient axial electromagnetic motor (DSAEM) is proposed. The basic structure and working principle of the motor are described, the mathematical model of the motor is established and rerified by finite element simulation. The magnetic field, inductance, noload characteristics and load characteristics of the motor were analyzed in detail. The results show that DSAEM has a completely symmetrical threephase magnetic linkage which can output a more stable voltage. The motor winding has high space utilization rate, high power density and high efficiency, and can meet the basic requirements of aviation power supply.