ASYMMETRIC THREE-PHASE FRACTIONAL-SLOT WINDING WITH 2p = 6c POLES PLACED IN z = 66c 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 fractional-slot double-layer lap winding with 2p = 6c poles in z = 66c slots, m' = 3 bands, and slot number per pole per phase q = z/3p - 22/3 has 3pc coil groups 1G through 9G with coil grouping 8 7 7 7 7 8 7 8 7 repeated c times. Novelty is that concentric coils have slot pitches y_si = 18 - 2(i - 1) and turn numbers (1 - x)w_c for coils with i = 1, 8 and turn number (1 + x)w_c for coil with i = 4 in eight-coil groups 1G, 6G, 8G; slot pitches y'_si = 17 - 2(i - 1) and turn number (1 + x)w_c for coil with i = 4 in all seven-coil groups, turn number (1 - x)w_c for coil with i = 1 in coil groups 3G, 4G and with i = 7 in coil groups 7G, 9G; for coil groups 2G, 5G slot pitches y_s = 11 - (1 + x)w_c for coil with i - = 7 in coil group 2G and 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 - 8 and i = 1 - 7 are coil numbers in coil groups starting from external one; 2w_c is turn number in slots completely filled with winding.

EFFECT: reduced asymmetry and differential scatter ratios.

1 cl, 4 dwg