ASYMMETRIC THREE-PHASE FRACTIONAL-SLOT WINDING WITH 2p = 6c POLES IN z = 60c SLOTS Russian patent published in 2007 - IPC H02K3/04 H02K3/28 

FIELD: electrical and electromechanical engineering; three-phase induction and synchronous machines including slip-ring induction motors.

SUBSTANCE: proposed asymmetric three-phase double-layer m' = 3-band winding with 2p = 6c poles placed in z = 60c slots with slot number per pole per phase q = z/3p = 20/3 has 3pc coil groups with coil grouping 7 6 7 6 7 7 7 7 6 repeated c times. Novelty is that concentric coils have slot pitch y_si = 16-2(i - 1) and turn number (1 - x)w_c for coils with i' = 1, 7 and turn number (1 + x)w_c for coil with i = 4 in seven-coil groups, slot pitch y'_si = 15 - 2(i - 1) and turn number (1 + x)w_c for coil with i' = 4 in six-coil groups; turn number for remaining coils of coil groups equals w_c, where c = 1, 2, 3, ...; i' = 1 - 7 and i' = 1 - 6 are coil numbers in coil groups starting from external one; 2w_c is turn number in slots completely filled with winding; x = 0.5.

EFFECT: reduced asymmetry and differential scatter ratios.

1 cl, 4 dwg