THREE-PHASE FRACTIONAL STATOR WINDING Russian patent published in 1995 - IPC

FIELD: electrical machines. SUBSTANCE: each coil group of stator winding has four coils with slot pitch and coil turns equal to y_s=13, 11, 9, 7 and 2·W_c,, (1+x)·W_c,, W_c,(1+x)·W for odd-numbered groups, and (1+x′)·W_c,, (1+x)·W_c,, (1-x)·W_c,, (1-x′)·W_c for even-numbered groups; starting sides of coils of first pair of groups are placed in slots numbered 1, 2, 3, 4 and 6, 7, 8, 9; each next pair of groups is placed in slots shifted by 2q=9 slots relative to preceding pair of groups, where p=1, 2, 3, z= 27p; c=0, 1, 2,(2p-1); 2′·W_c is number of turns per slot; x and x′ are to be selected from range 0,25≅ x≅ 0,30 and 0,70≅ x′≅ 0,75. EFFECT: enlarged functional capabilities. 4 dwg