THREE-PHASE DOUBLE-LAYER ELECTRIC MACHINE WINDING IN z=90·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=90·c grooves: 1) at 2p=22·c poles with number of grooves per pole and phase q=z/3p=30/11 made of 3p·c coil groups with numbers from 1G to 33G·c and grouping of coils by row 33323332332, which is repeated 3 c times: in the first grouping 1G...11G three-coil groups have steps of coils by grooves y_gi=6, 4,1 with numbers of turns (1-x)w_c, (1+x)w_c, (1-x)w_c, and double-coil - y_g=5, 3 c (1+x)w_c, (1+x)w_c turns at value of x=0.40; 2) at 2p=26·c poles with number of grooves per pole and phase q=z/3p=30/13 made of 3p·c coil groups with numbers from 1G to 39G·c and grouping of coils by row 3223223223222, 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 number of turns (1-x)w_c, w_c, (1-x)w_c, and double-coil - y'_gi=4, 2 with (1+x) w_c, w_c turns in 2G, 3G, 5G, 6G, 8G, 9G and (3+x)w_c, (3-x)w_c turns in 12G, y'_gi=3, 3 with (1+x)w_c, w_c turns in 11 G and w_c, (1+x)w_c turns in 13G at value of x=0.36, where c=1, 2, 3,...; 2w_c - number of grooves turns, which are completely 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=30//11 and q=30/13) loop winding.

2 cl, 8 dwg