METHOD FOR MANUFACTURING HIGH-VOLTAGE COILS OF ELECTRICAL MACHINES Russian patent published in 2001 - IPC

FIELD: electrical engineering; manufacturing high-voltage electrical machines. SUBSTANCE: circular wire rods, up to 4 mm in cross-sectional area, are wound together with turn-to-turn insulation, shaped to form hairpin coil, stretched into coils, end portions of lower and upper half-circuits are straightened, and wire rod in the form of asymmetric hairpin coil is wound; inner-circuit length of hairpin coil l_ic = l_ric, l_ic = l_ric+(5-10) mm, and l_ic = l_ric-(5-10) mm, where l_ric is rated length of coil inner circuit; wire rod is stretched into coil, its end portions are straightened, coil is placed in stator core, l_pic and Δl are determined, where l_pic is precise length of coil inner circuit; Δl is respective difference in length of lower and upper half-circuits of coil; geometry of each half of hairpin-coil template is corrected according to l_pic and Δl, horizontal axis of circular wire rod wound with inner radius R = 0,159l_pic is offset relative to head axis of template halves through l = sinγ•R, where γ = 20,66Δl/R; circular wire rod is shaped to form asymmetric hairpin coil. EFFECT: reduced deformation in coil manufacture and placing in stator. 1 dwg