THREE-PHASE DOUBLE-LAYERED ELECTRIC MACHINE WINDING IN z=102·c SLOTS WITH 2p=26·c POLES (q=34/13) Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machinery industry.

SUBSTANCE: three-phase double-layered electric machine winding in z=102·c slots with 2р=26·с poles with number of slots per pole and phase q=z/3p=34/13 is composed of 3р·с coil groups with numbers from 1G to 39G·с and coil grouping as 3323323233232 sequence repeated 3·c times: In 1G...13G groups of the first grouping concentric coils have slot pitches of У_si=6, 4, 2 with (l-x)w_K, (l+x) w_K, (l-x)w_K turns for three-coil groups and y'_si=5, 3 with w_K, (l+x)w_K turns for two-coil groups at х=0.56, where с=1, 2, 3, ...; 2w_K is the number of turns in those slots that are completely filled with winding. 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=34/13) lap winding of electric machinery.

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