COMBINED THREE-PHASE-AND-MULTIPHASE ROTOR WINDING Russian patent published in 1997 - IPC

FIELD: rotary frequency and phase converters. SUBSTANCE: double-layer rotor winding with pole number p₂ for three-phase generator section and p₁ for multiphase squirrel-cage motor section is placed in slots Z₂ and has 6p₂ distributed coil groups numbered in generator phases 1+3i, 3+3i, 5+3i connected in ster, with phase terminal leads brought out to three slip rings; starting leads of odd-numbered groups of each phase are connected to phase terminal and those of even-numbered groups, to star neutral point; finishing leads of all groups of phase are interconnected; with pole numbers p₂= 3, p₁= 1 and slots Z₂= 27, odd-numbered groups have two concentric coils at slot pitch Y_s= 7 and 5 and turn number (1-x)W_c and (1+x)W_c; even numbered groups have one coil at slot pitch Y_s= 6 and turn number W_c, where i ranges from 0 to (2p₂-1) = 5; 2W_c is turn number per slot; x is chosen within the range of 0,50 ≅ x ≅ 0,65. EFFECT: improved electromagnetic parameters. 1 tbl