THREE-PHASE ASYMMETRICAL FRACTIONAL-SLOT WINDING WITH 2p=12·c POLES IN z = 75·c SLOTS Russian patent published in 2008 - IPC H02K3/04 H02K3/28 

FIELD: electric machinery industry.

SUBSTANCE: three-phase asymmetric fractional-slot winding with 2р=12·с poles in z=75 с slots is implemented as a double-layered m'=3-zone winding with number of slots per pole and phase defined as q=z/3p=25/6, and is composed of 18·с coil groups with numbers from 1G to 18G с and with coils grouping as 544444454444445444 sequence repeated c times. In 1G...18G groups concentric coils have slot pitches of y_si=10, 8, 6, 4, 2 with turn numbers of (l-x)w_K, w_K, w_K, w_K, (l-x)w_K for all five-coil groups, and y'_si=9, 7, 5, 3 with w_K, (l+x) w_K, w_K, (l-x) w_K turns for four-coil groups 2G, 3G, 13G, 14G, 17G, while other groups with slot pitches of y'_si=6, 6, 6, 6 have (l-x) w_K, w_K, (l+x) w_K, w_K turns in 4G, 5G, 6G, 7G, 18G groups and w_K, (l+x) w_K, w_K (l-x) w_K turns in 9G, 10G, 11G, 12G, 16G, where с=1, 2, 3,..., 2w_K is the number of turns in those slots that are completely filled with winding, and х=0.48.

EFFECT: lowering of asymmetry factor and differential scattering of m=3-phase, m'=3-zone asymmetric fractional-slot lap winding.

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