ASYMMETRIC THREE-PHASE FRACTIONAL-PITCH WINDING ON 2p=6c POLES IN z = 15c SLOTS Russian patent published in 2006 - IPC H02K3/04 H02K3/28 

FIELD: electrical engineering; three-phase windings for ac synchronous and induction motors.

SUBSTANCE: proposed asymmetric fractional-pitch winding placed in z - 15 slots on 2p = 6s poles is double-layer m'= three-belt winding with slots per pole per phase q = z/3p = 5/3 assembled of 3 pc coil groups alternating as 2 1 2 1 2 2 2 2 1 repeated c times; novelty is that slot pitch of concentric coils in double-coil groups y_m = 3, 1 and turn number (1 - x)w_c); slot pitch of those in single-coil groups y'_m = 2 and turn number (1 + x)w_c) at x = 0.55, where c = 1, 2, 3 ...; 2w_c is turn number in slots completely filled with winding.

EFFECT: reduced asymmetry factor and differential dissipation of winding.

1 cl, 4 dwg