Electromagnetic performance of three-phase doubly fed doubly salient electromagnetic generator
In this paper, a three-phase dual armature-winding doubly fed doubly salient electromagnetic generator (DAW-DFDSEG) is proposed. The reason for using different numbers of turns in the two sets of armature windings is presented. On the basis of the finite-element method (), two different DAW structures (DAW1 and DAW2) with different turn numbers of armature windings are analysed and compared. The DAW2 structure outputs more power than DAW1 under the same turn number of armature windings, due to the stronger flux-weakening armature reaction under heavy magnetic saturation. However, the manufacturing technique of DAW2 is more complex than that of DAW1 in the limited stator slot. The DAW1 with two set armature windings of 11 and 12 is researched in detail in terms of flux linkage, induced voltages, winding voltages, winding currents, self-inductances and mutual inductances by simulation and the equivalent rectifier circuit patterns of two time zones are also presented. Meanwhile, its commutation procedure is analysed in detail. To validate the analysis, a 12/8-pole DAW-DFDSEG prototype has been designed and the simulated waveforms agree well with the measured ones.