THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=87·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=87·c grooves: 1) at 2p=22·c poles with number of grooves per pole and phase q=z/3p=29/11 made of 3p·c coil groups with numbers from 1G to 33G·c grouping of coils by row 33233233232, which is repeated 3c times: in the first grouping 1G...11G three-coil groups have steps of coils to grooves y_gi=6, 4, 2 with numbers of turns (1-x)W_c, (1+x)w_c, (1-x)W_c, and double-coil - y'_gi=5.3 c w_c, (1+x)w_c turns at x=0.56; 2) at 2p=26 c poles with number of grooves per pole and phase q=z/3p=29/13 made of 3p·c coil groups with numbers from 1G to 39G·c and grouping of coils by row 3222322232222, which is repeated 3 c times: in the first grouping 1G...13G coils have steps by grooves y_g=3 with number of turns (1-x)w_c, w_c, (1-x)w_c in 1G, 5G, 9G, (1+x)w_c, (1-x)w_c in 2G, 6G, 10G, (1-x)w_c, (1+x)w_c in 4G, 8G, 13G and y'_gi=4.2 c (1+x)w_c, (1-x)w_c in 3G, 7G, 11G, 12G at value of x=0.415. 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=29/ 11 and q=29/13) loop winding.

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