THREE-PHASE FRACTIONAL-PITCH (Q=0 Russian patent published in 1995 - IPC

875) ARMATURE WINDING. FIELD: electromechanical engineering. SUBSTANCE: three-phase fractional- pitch (q-0.875) double-layer armature winding with pole pairs is placed in Z slots. Each slot is divided in width into two elementary slots. Elementary slot number Z_∂=2Z. Elementary number of slots per pole per phase q_e=2q. Winding has 6p coil groups, coils being grouped in rows 2 2 2 1. Row is repeated 3p/2 times. Groups 4g+4c have one coil with elementary slot pitch Y_ep= 4=4 and turn number (1+x)W_c. Remaining groups have two concentric coils with slot pitch Y_ep= 5,3. Groups numbered 1g+4c and 3g+4c have turn number (1+x)W_c and (1-x)W_c, groups 2g+4c have turn number (1-x)W_c. Coil groups of first, second, and third phases are connected in phases in series for differential connection of even-numbered groups in respect to odd-numbered ones. EFFECT: improved design. 5 dwg