THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=108·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=108c grooves: 1) at 2p=22·c poles with number of grooves per pole and phase q=z/3p=36/11 made of 3p·c coil groups with numbers from 1G to 33G·c and grouping of coils by row 43343334333, which is repeated 3·c times: in the first grouping 1G...11G four-coil groups have steps of coils by grooves y_gi=8, 6, 4, 2 with (1-x)w_c, w_c, w_c, (1-x)w_c turns, three-coil - y'_gi=7, 5, 3 with (1-x)w_c, (1+x)w_c, w_c in 6G, 10G, y'_gi=5, 5, 5 with w_c, (1+x)w_c, (1-x)w_c in 2G, 5G, 9G and with (1-x)w_c, (1+x)w_c, w_c in 3G, 7G, 11G with value of x=0.485; 2) at 2p=26·c poles with number of grooves per pole and phase q=z/3p=36/13 made of 3p·c coil groups with numbers from 1G to 39G·c and grouping of coils by row 3332332332332, 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 w_c, w_c, (1-x)w_c turns in 1G, 4G, 6G, 8G, 10G, 12G and (1-x)w_c, (1+x)w_c, w_c in 7G, 11G, y_gi=4, 4, 4 with (1-x)w_c, (1+x)w_c, w_c in 2G and with w_c, (1+x)w_c, (1-x)w_c in 3G, and double-coil at y'_gi=5, 3 - by (1+x)w_c turns with value of x=0,.9, where c=1, 2, 3,...; 2w_K - number of grooves turns that are fully filled with winding. Specified distribution of coils with unequal number of turns are repeated in every subsequent grouping.

EFFECT: reduction of differential scattering coeffcient σ_s for symmetric m'=3-zone electric machine fractional (q=36/11 and q=36/13) loop winding.

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