THREE-PHASE FRACTIONAL-SLOT ARMATURE WINDING Russian patent published in 1995 - IPC

FIELD: combined electric machines with two unlike-polarity fields in magnetic circuit. SUBSTANCE: coil groups of three-phase armature winding numbered 4'+4c have one coil with slot pitch =4 and remaining groups have two concentric coils with slot pitch =5 and 3; turn number in first assembly of coil groups W_c for groups numbered 1' and 3', W_c and (1-x)W_c for group numbered 2', (1+x)W_c for group numbered 4'; each next assembly is repeated with interval of four groups relative to preceding assembly; value of x is selected from range 0,45≅ x≅ 0,55, pole number p is selected as even number and p≥ 2; slot number z is found from formula z=10.5 xp; turn number in each slot is 2·W_c; numbers of coil groups are defined from row k=0, 1, 2, (2p-1). EFFECT: improved design. 5 dwg