THREE-PHASE FRACTIONAL-SLOT ELECTRICAL-MACHINE WINDING Russian patent published in 1997 - IPC

FIELD: multipole, dual-speed and combined electrical machines. SUBSTANCE: double-layer fractional-slot (q= 1.4) winding has phase coil groups numbered 1G+(3k)G, 3G+(3k)G, 5G+(3k)G series-connected for differential connection of four groups relative to odd-numbered ones; coils are grouped in row 2,1,2,1,1 repeated 6c times; slot pitch y_s=5; turn number of coils in two-coil groups is (1-x)W and that of single- coil groups, (1+x)W; p=5c, Z= 42c at c-1,2,...,;k may be from 0 to (2p-1) and 0.2<=x<=0.3. EFFECT: improved electromagnetic characteristics due to increased winding factor and reduced differential dissipation. 4 dwg