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

FIELD: electric machine engineering, three-phase asynchronous and synchronous machines. SUBSTANCE: fractional winding with number of slots per pole and phase Q=2.25, with grouping of coils in coil group by row 2 2 2 3, with numbers of coil groups in phases 1L+3k, 5L+3k and 9L+3k is used in agreement with invention. Groups with numbers 4L+4k include three coils with slot pitches y= 7, 5, 3 with number of turns W_k, W_k, (1-x)W_k, the rest of groups have two coils with y=6 and 4 with number of turns W_k, where k=0, 1, 2, . . ., and 0.45 ≅ x ≅ 0.55. EFFECT: increased winding coefficient, diminished differential dissipation. 5 dwg