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

FIELD: electric machine engineering. SUBSTANCE: invention is intended for asynchronous and synchronous machines. Winding with number of slots per pole and phase Q=4.25 is made double-layer concentric with numbers of groups in phases 1L+3k, 5L+3k and 9L+3k with grouping of coils by row 4 4 4 5. Groups with numbers 4L+4k have five coils with pitches y'=13, 11, 9, 7, 5. The rest of groups have four coils with pitches 2 y= 12, 10, 8, 6. Number of turns in coils of first grouping of coil groups equals 3 (1+x)W_k,4 W_k,5 W_k,6 (1-x)W_k for groups 1L, 2L, 3L; 7 (1-x)W_k,8 (1+x)W_k,9 W_k,10 W_k,11 (1-x)W_k for group 4L. Each next grouping is repeated with interval of four groups relative to preceding grouping, where k=0, 1, 2, ... and 0.45 ≅ x ≅ 0.55. EFFECT: diminished differential dissipation and usage of copper. 5 dwg