Design of a 1/3 pole-pair combination brushless doubly-fed machine with a two-phase rotor winding

The rotor winding (RW), which should be simple and reliable, of the brushless doubly-fed machine (BDFM) ought to produce two fundamental magnetic fields with different pole pairs. In this paper, a two-phase RW is designed and a finite element (FE) model of a 1/3 pole-pair combination BDFM based on the two-phase RW is established to prove the correctness of the design.