THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=93·c GROOVES AT 2p=22·c AND 2p=26·c POLES Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machine industry.

SUBSTANCE: three-phase double-layer electric machine winding in z=93·c grooves: 1) at 2p=22·c poles with number of grooves per pole and phase q=z/3p=31/11 made of 3p·c coil groups with numbers from 1G to 33G c and grouping of coils by row 33333233332, which is repeated 3·c times: in the first grouping 1G...11G three-coil groups have steps of coils by grooves y_gi=6, 4, 2 with w_c, w_c, (1-x)w_c turns in 1G, 5G, 7G, 10G and w_c, (1+x)w_c, (1-x)w_c in 3G, y_gi=4, 4, 4 with (1-x)w_c, (1+x)w_c, w_c in 2G, 8G and w_c, (1+x)w_c, (1-x)w_c in 4G, 9G, and double-coil - y'_gi=5, 3 with (1+x)w_c, (1+x)w_c turns at value of x=0.52 and number of 2w_c turns of every groove; 2) at 2p=26·c poles with number of grooves per pole and phase q=z/3p=31/13 made of 3p·c coil groups with numbers from 1G to 39G·c and grouping of coils by row 3232232322322, which is repeated 3 c times: in the first grouping 1G...13G three-coil groups have steps of coils by grooves y_gi=6, 4, 2 with (1-x)w_c, w_c, (1-x)w_c turns, and double-coil - y'_gi=5, 3 with w_c, (1+x)w_c turns at value of x=0.38, where c=1, 2, 3,...; 2w_c - number of grooves turns that are completely filled with winding.

EFFECT: reduction of differential scattering coefficient σ_s for symmetric m'=3-zone electric machine fractional (q=31/11 and q=31/13) loop winding.

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