THREE-PHASE DOUBLE-LAYERED ELECTRIC MACHINE WINDING IN z=66·c SLOTS WITH 2p=26·c POLES (q=22/13) Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machinery industry.

SUBSTANCE: three-phase double-layered electric machine winding in z=66·c slots with 2р=26·с poles with number of slots per pole and phase defined as q=z/3p=22/13 is comprised of Зр·с coil groups numbered from 1G to 39G c and coil grouping as 2221221221221 sequence repeated 3·c times. At that, in the first grouping, 1G...13G, two-coil groups have coil slot pitches of y_si=3, 3·with numbers of turns of (l-x)w_K, w_K in the 1G group and w_K, (l-x)w_K in the 3G group, y_si=4, 2 with numbers of turns of (l-x)w_K, (l+x)w_K in the 2G group and (l-x)w_K, w_K in 5G, 6G, 8G, 9G, 11G, 12G groups, while one-coil groups, 4G, 7G, 10G, 13G, have У_s=3-(1+х)w_K turns, where с=1, 2, 3, ...; 2w_K is the number of turns in those slots that are completely filled with winding, and х=0.47. This distribution of coils with different number of turns is repeated in every next grouping.

EFFECT: lowering of differential scattering factor σ_d of asymmetric t'=3-zone fractional-slot (q=22/13) lap winding of electric machinery.

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