Abstract: The doubly salient electro-magnetic machine (DSEM) is a new type of brushless electrical machine, whichoffers an excellent balance between cost, reliability, power density, and high-speed capability. Therefore, there isan excellent potential for the use of DSEM in airplanes. This paper is devoted to investigating the electro-magneticcharacteristics of DSEM. The relation between overlapped angles of poles and rotor position is described for DSEM,and it is validated theoretically that the sum of all overlapped angles of poles is constant . In particular, the inductance and torque characteristics are discussed in detail, and simulation results are given to show the validity of the researches in this paper. Finally, the comparison is made between DSEM and the doubly salient permanent magnetmachine (DSPM) in their electro-magnetic characteristics. The research results presented by the paper are useful instudying the new DSEM.

Key words: doubly salient machine, electro magnetic characteristics, switched reluctance motor, inductance, torque