ASYMMETRIC THREE-PHASE FRACTIONAL-SLOT WINDING WITH 2p = 6c POLES PLACED IN z = 30c 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 fractional-slot double-layer lap winding, m = 3-phase, m' = 3-band, with 2p = 6c poles in z = 30c slots and with slot number per pole per phase q = z/3p = 10/3 has 3pc coil groups 1G through 9G, with coil grouping 4 3 3 3 3 4 3 4 3 repeated c times. Novelty is that concentric windings have slot pitch y_pi = 8 - 2 (i - 1) and turn numbers (1 - x)w_c; for coils with i' = 1, 4 and turn number (1 + 1)w_c, for coil with i = 2 in four-coil groups 1G, 6G, 8G, slot pitches y'_pi = 7 - 2(i' - 1) and turn number (1 + x)w_c, for coils with i' = 2 in all three-coil groups turn number equals (1 - x)w_c, for coils with i' = 1 in coil groups 3G, 4G, and for coils with i' = 3 in coil groups 7G, 9G; for coil groups 2G, 5G with slot pitch y'_pi = 5 turn number equals (1 - x)w_c for coil with i' = 3 in coil group 2G, and for coil with i' = 1 in coil group 5G ; turn number in remaining coils of coil groups equals w_c, where c = 1, 2, 3 ...; i' = 1 - 4, and i' = 1 - 3 are coil numbers in coil groups starting from external one; 3w_c is turn number in slots completely filled with winding; x = 0.55.

EFFECT: reduced asymmetry and scatter ratios.

1 cl