TWELVE-PHASE FRACTIONAL (q=4/5) WINDING OF A C ELECTRIC MACHINE Russian patent published in 2004 - IPC

FIELD: electrical engineering, electric machine manufacture. SUBSTANCE: invention refers to 12-phase asynchronous motors with squirrel-cage rotors supplied from semiconductor frequency converters in frequency-controlled A C drive. Technical result of invention lies in manufacture of double-layer winding with m=12 phases, m'=12-zone fractional winding with q=4/5 and p=5 in z= 12pq=48 slots with elimination of most strongly expressed harmonic of fractional order from its magnetomotive force to decrease differential dissipation. Main point of invention consists in manufacture of double-layer lap winding with 2p=10 poles in z=48 slots with number of slots and phases per pole q=4/5 of coils K=48 numbered from 1K to 48 k and slot pitch y_s with their row grouping 1 1 1 1 0. Coils 1K+4(k) and 4K+4(K) have (1+x)w_c turns and coils 2K+4(k) and 3K+4(k) have (1-x)w_c turns. In first phase coils 1K, 11 K, 30K, 40 K are connected in series aiding with start of phase from start of 1K and its finish from finish of 40K and coils of each next phase alternate with interval of 20 numbers in limit of K=48 with regard to coils of first phase, where y_s = 6,2w_c is number of turns in each slot, x=0.15 and value k in numbers of coils changes in limit from 0 to 11. EFFECT: decreased differential dissipation. 3 dwg