SPLIT THREE-PHASE WINDING Russian patent published in 1997 - IPC

FIELD: electric engineering. SUBSTANCE: winding has p poles and number of slots for pole and phase is equal to q = 3.75. It has two layers of coaxial coils in z slots of 6p coil groups which serial numbers in first, second and third phases are I+3(K)I, 5I+3(K)I, 9I+3(K)I. Said coil groups in phases are connected in series under condition of opposing connection of even groups with respect to even ones. Coils are grouped in coil groups in row in order 4 4 4 3, which is repeated 3p/2 times and groups which numbers are 4I+4(K)I have three coils which slot steps are 10, 8, 6. Other groups have four coils which slot steps are 11, 9, 7, 5. First group of coil groups has following number of turns in coils (1+x)W_к, (1+x)W_к, (1-x)W_к, (1-x)W_к, for groups 1I and 3I; (1-x)W_к, (1+x)W_к, W_к, (1-x)W_к for group 2I, (1+x)W_к, W_к, (1-x)W_к for group 4I. Each subsequent group of groups follow this order in period of four groups with respect to previous group. P is even number, z = 22.5pl k = 0, 1, 2, ..., (2p-1); 2W_к is number of turns in slot, x is in range of 0,45≅X≅0,55.. EFFECT: improved electromagnetic characteristics due to decreased differential dissipation. 4 dwg