THREE-PHASE FRACTIONAL-SLOT(Q=6/7) STATOR WINDING Russian patent published in 1997 - IPC

FIELD: multipolar AC machines. SUBSTANCE: double-layer winding with number of poles 2p=14 in Z=36 slots of K=36 coils with spacing in slots y_s and numbered from 1K to 36K, series- connected in slots, coils numbered 1K, - 3K, 6K, -8K. 11K, 16K, -19K,21K, -24K, 26K, -29K, -34K are cut in the first phase, and for the two other phases their numbers alternate at intervals of 12 and 24 coils; the numbers of turns equal to (1+X)W_c for coils 1K, 2K, (1-X)W_c for coils 3K, 4K, 5K, 6K, and the mention grouping of unequal-turn coils alternates in each subsequent six coils, where y_s=2, the minus sign before the coil number means its connection in opposition in a phase relative to the coil without this sign, 2W_c - number of turns in a slot, and the value of parameter "X" is selected within 0,20≅x≅0,30. EFFECT: reduced differential dissipation. 5 dwg, 1 tbl