JOINT ROTOR WINDING OF SINGLE-MACHINE FREQUENCY CONVERTERS Russian patent published in 1997 - IPC

FIELD: electric engineering. SUBSTANCE: winding has two layers which pole number is equal to is equal to p2 for three-phase generating winding and p1 for multiple-phase short-circuited motoring winding of 6p2 distributed coil groups which numbers in generating phases are 1 + 3i, 3 + 3i, 5 + 3i. They are joined in star connection which phase terminals are connected to three contact rings, ratio p2 to p1 is integer which is not less than 3. I ranges from 0 to 2p2 - 1. Beginning terminals of each odd group are connected to phase terminal, beginning terminals of each even group are connected to zero point of star. Ends of each groups of same phase are connected to each other. Frontal part on side of contact rings is supported by cylindrical winding support which is made from insulation material, is mounted on shaft using cotter with disk part which has four steps on its outer surface. Died brass or copper ring is put on each step along its width. Each ring is connected through holes in disk part to terminals of beginnings of groups. Each even group is connected to first ring. Ends of odd and even groups of phases I, II, III are connected to subsequent rings. Beginning terminals of odd groups of each phase which are connected to rings are passed through 3p2 holes in cylindrical part of winding support, which disk part is of external diameter D of rotor core for depth of 3.0 mm. External diameter of first step is equal to D-10.0 mm and for each next step it is less than previous one by 10.0 mm while ring width is 3.0 mm and depth is 2.0 mm. EFFECT: simplified design, increased reliability.