Abstract: In this paper,the structure characteristics of five-phase doubly salient electro-magnet generators（DSEGs）are analyzed theoretically.The self-inductance and voltage of the short-circuit phase are investigated,the flux linkage,voltage of normal phases and the rectified voltage are analyzed when a single phase short-circuit fault happens under the no-load running condition.Meanwhile,the external and power characteristics of the motor and the short-circuit current are investigated with different exciting currents.The magnetic field of the motor,flux linkage of the short-circuit phase and short currents without load are investigated with armature winding resistances in four different short-circuit moments using finite-element method.The analysis results show that the initial flux linkage value of the short-circuit phase is varied with different short-circuit moments,and the minimum value,maximum value and the variation tendency of flux linkage of the short-circuit phase are irrelevant to the fault moment after 54° electrical degree.Finally,the characteristics of a five-phase 20/16-2 DSEG are verified by the experimental results.