THREE-PHASE DOUBLE-LAYERED ELECTRIC MACHINE WINDING IN z=120·c SLOTS WITH 2p=22·c POLES (q=40/11) Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machinery industry.

SUBSTANCE: three-phase double-layered electric machine winding in z=120 с slots with 2р=22·с poles with number of slots per pole and phase defined as q=z/3p=40/11 is composed of 3р с=33·с coil groups with numbers from 1G to 33G с and with coils grouping as 44344344343 sequence repeated 3 times. In 1G...11G groups of the first grouping concentric coils have slot pitches of y_si =8, 6, 4, 2 with numbers of turns (l-x)w_K, (l+x)w_K, w_K, (l-x)w_K for four-coil groups, and y'_si=7, 5, 3 with w_K, (l+x)w_K, w_K turns for three-coil groups. At that, the said distribution of coils with different number of turns repeated in every next grouping, where с=1, 2, 3, ..., 2w_K is the number of turns in those slots that are completely filled with winding, and х = 0.58.

EFFECT: lowering of differential scattering σ_d of m'=3-zone symmetrical fractional-slot lap winding of electric machinery.

4 dwg