ELECTRICAL-MACHINE THREE-PHASE DOUBLE-LAYER WINDING WITH 2p=10c POLES IN z=72c SLOTS Russian patent published in 2006 - IPC H02K3/04 H02K3/28 

FIELD: electrical and electromechanical engineering; three-phase induction and synchronous machines.

SUBSTANCE: proposed three-phase double-layer lap winding with 2p = 10c poles in z = 72c slots and coils grouped in row 5 5 5 5 4 repeated 3c times is made of 15c concentric coil groups numbered 1G through 15(c)G at mean slot pitch of coils y_c = 7. Novelty is that in order to reduce differential dissipation σ_d in m' = three-band fractional-pitch (q = 24/5) lap winding, concentric coil groups 1G, 4G in first-grouping coil groups 1G through 5G have slot pitch y_m = 11 - 2(i - 1) with internal-coil turn number (1 - x)w_c, and remaining coil groups have slot pitch y_s = 7 and turn numbers (1 - x)w_c and(1+ x)w_c in first and third coils of coil group 2G, turn numbers (1 + x)w_c and(1- x)w_c in third and fifth coils of coil group 3G, turn numbers (1 + x)w_c in second and third coils of group 3G. Turn number in remaining coils of concentric coil groups is w_c, mentioned distribution of coils with unequal turn number being repeated in each next grouping, where c = 1, 2, 3, ...; i = 1 through 5; 2w_c is turn number in each slot; x = 0.51.

EFFECT: reduced differential dissipation in fractional-pitch lap winding.

1 cl, 3 dwg