THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING AT 2p=22·c POLES IN z=72·c AND z=78·c GROOVES Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machine industry.

SUBSTANCE: three-phase double-layer electric machine winding at 2p=22c poles, made of 3p·c coil groups with numbers 1G...33G·c: 3) in z=72·c grooves with number of grooves per pole and phase q=24/11 and grouping by row 32222322222: in the first grouping 1G...11G coils have steps by grooves y_g=3 with number of turns (1-x)w_c, w_c, (1-x)w_c in 1G, 6G, (1+x)w_c, (1-x)w_c in 2G, 7G, 8G (1-x)w_c, (1+x)w_c in 5G, 10G, 11G and y_gi=4, 2 with (1+x)w_c, (1-x)w_c turns in 3G, 4G, 9G at value of x=0.42; 2) in z=78·c grooves with number of grooves per pole and phase q=26/ll and grouping by row 32322322322: in the first grouping 1G...11G 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=0.39. Such distribution of coils with unequal number of turns is repeated in every subsequent grouping, 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=24/11 and q=26/11) loop winding.

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