THREE-PHASE FRACTIONAL WINDING Russian patent published in 1997 - IPC

FIELD: electric machine engineering. SUBSTANCE: invention is meant for asynchronous and synchronous electric machines. Minding has number of slots per pole and phase Q= 0.125 in coil groups with number in phases 1L+3k, 9L+3k, 17L+3k, groups with coil number 1L+8k have two concentric coils with pitches y=5 and 3 and number of turns (1-x)W_k and W_k and other groups include one coil with y=4 and number of turns (1+x)W_k for groups having numbers 5L+8k and W_k for the rest of groups where k=0, 1, 2, and 0.45 ≅ x ≅ 0.55. EFFECT: decreased differential dissipation and enhanced winding coefficient. 7 dwg