COMBINED ROTOR WINDING OF SINGLE-MACHINE FREQUENCY CHANGER Russian patent published in 1995 - IPC

FIELD: electromechanical engineering; single-machine frequency changers. SUBSTANCE: combined winding has pole pairs p₁/p₂·p₁=1, p₂≥ 4 are integer number. It is three-layer winding placed in Z=6Cq' slots. Slot pitch is y_s. Winding is of short-circuited type for pole pairs p₁ and three-phase for pole pairs p₂. Three-phase winding is star- or delta-connected. Leads P1, P2, P3 are connected to slip rings. Number of coil groups K=6c, where c≥ 2 is integer number. Each coil group has q′ series-connected coils. Groups number 1K through cK are cumulatively connected in series with first-phase leads P1; group shifted through 3c groups is differentially connected in parallel with each group. Groups of other phases alternate relative to phase P1. Alternation interval for phase P2 is 2c, for phase P3, 4c. For winding, 1≅ q′≅ 3 and y =ent[(p -1)Z/2p ].. EFFECT: improved design. 6 dwg