THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=84·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=84·c grooves: 1) at 2p=22 c poles with number of grooves per pole and phase q=z/3p 28/11 made of 3p·c coil groups with numbers from 1G to 33G·c and grouping of coils by row 33232323232, 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 number of turns (1-x) W_c (1+x) W_c, (i-x) W_c, and double-coil y_g-5.3 c W_c, (1+x) W_c turns at value of x=0.55; 2) at 2p=26 c poles with number of grooves per pole and phase q=z/3p=28/13 made of 3p c coil groups with numbers from 1G to 39G c and grouping of coils by row 3222223222222, which is repeated 3 c times: in the first grouping 1G...13G three-coil groups have steps of coils by grooves y_gi=5, 3, 1 with numbers of turns (1-x) W_c, W_c, (1-x) W_c, and double-coil - y'_gi=4,2 c (1+x) W_c, (1-x) W_c turns in 4G, 10G, 11G, y'_gi=3,3 c (1+x) W_c, (1-x) W_c turns in 2G, 3G, 8G, 9G and (1-x) W_c,(1+x) W_c in 5G, 6G, 12G, 13G at value of x=0.43, where c=1, 2, 3,...; 2 W_c - number of grooves turns, which 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 coefficient σ_s for symmetric m'=3-zone electric machine fractional (q=28//11 and 28/13) loop winding.

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