ASYMMETRIC THREE-PHASE FRACTIONAL-SLOT WINDING WITH 2p = 6c POLES PLACED IN z = 51c 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 winding with 2p = 6c poles in z = 51c slots, m' = 3 bands and slot number per pole per phase q = z/3p = 17/3 has 3 pc coil groups with coil grouping 6 5 6 5 6 6 6 6 5 repeated c times. Novelty is that concentric windings have slot pitches y_si = 13 - 2(i - 1) and coil numbers (1 - x)w_c for coils with i = 1, 6 and turn number (1 + x)w_c for coils with i = 3 in all six-coil groups, slot pitches y'_si = 12 - 2(i - 1) and turn number (1 + x)w_c for coils with i' = 3 in all five-coil groups; turn number in remaining coils of coil groups equals w_c, where c = 1, 2, 3, ...; i = 1 - 6 and i' = 1 - 5 are coil numbers in coil groups starting from external one; 2w_c is turn number in slots completely filled with winding; x = 0.55.

EFFECT: reduced asymmetry and differential scatter ratios.

1 cl, 4 dwg