ELECTRICAL MACHINE FRACTIONAL-SLOT THREE-PHASE WINDING Russian patent published in 1995 - IPC

FIELD: electrical machines. SUBSTANCE: each coil group of three-phase winding has five coils with slot pitch and turn number y_s=16, 14, 12, 10, 8, and 2·(1+x)·W ,, W(1-x)·W for odd-number groups and =15, 13, 11, 9, 7, and (1+x′)·W ,, (1+x″)·W ,, W ·(1-x″)·W ,, (1-x′)·W for even-number groups; starting sides of coils of first pair of groups are placed in slots numbered 1, 2, 3, 4, 5 and 7, 8, 9, 10, 11; each next group is placed in slots shifted through 2q= 11 slots relative to preceding pair of groups, where p=1, 2, 3, L= 33 p; k=0, 1, 2, 3, (2p-1); 2′·W is number of turns per slot; values of x, x′, x″, are selected from ranges 0,45≅ x≅ 0,50;, 0,75≅ x′≅ 0,80;, 0,25≅ x″≅0,30.. EFFECT: improved design. 4 dwg