THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=81·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=81·c grooves: 1) at 2p=22·c poles with number of grooves per pole and phase q=z/3p=27/11 is made from 3p·c coil groups with numbers from 1G to 33G·c and grouping of coils by row 32323232322, which is repeated 3c times: in the first grouping 1G...11G three-coil groups have coil steps in grooves y_gi=6, 4, 2 c (1-x)w_c, w_c, (1-x)w_c with turns in 1G, 9G and (1-x)w_c, (1+x)w_c, (1-x)w_c in 3G, 5G, 7G, and double-coil - y'_gi=5, 3 c w_c, (1+x)w_c with turns at x=0.43; 2) at 2p=26·c poles with number of grooves per pole and phase q=z/3p=27/13 performed from 3p·c coil groups with numbers from 1G to 39G·c and grouping of coils by row 3222222222222, which is repeated 3·c times: in the first grouping 1G...13G coils have steps by grooves y_g=3 with number of coils (1-x)w_c, w_c, (1-x)w_c, in 1G, (1+x)w_c, (1-x)w_c in 2G, 3G, 5G, 6G, (1-x)w_c, (1+x)w_c in 9G, 10G, 11G, 12G, 13G and y'_G1=4,2 c (1+x)w_c, (1-x)w_c in 7G, 8G at value x=0.44. 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=27/11 and q=27/13) loop winding.

2 cl, 8 dwg