Research on operation characteristics of high speed modular hybrid excitation doubly salient high voltage DC generator for aircraft application

This paper introduces the modular hybrid excitation doubly salient machine (MHEDSM) with higher reliability and better voltage regulation characteristics. First of all, the basic structure and operation theory of the proposed electrical machine are introduced. Then, the voltage regulation characteristics and other operation characteristics of the proposed electrical machine are investigated. Futhermore, the influence of both air-gap and the ratio of the amount of turns of the electrical field winding (N2) to the amount of turns of the armature winding (N1) on voltage regulation characteristics and the influence of the width of the magnetic isolation sleeve tooth on the mutual inductance of the armature winding are analyzed. Finally, finite element (FE) simulation verifies that the electrical machine has good voltage regulation characteristics, and the short-circuit current (ish)of the electrical machine can be controlled to the rated current by reasonably adjusting the field current (if), which improves the fault tolerance of the electrical machine.