FIELD: electric machine engineering. SUBSTANCE: blades of fan have bent sections in plane of cross-section with curvature centers lying on both sides from axis of cross-section. Bending point of axis is displaced relative to point equidistant from edges of blades. Angle between tangent to axis of cross-section and line connecting leading and trailing edges is bigger at leading edge than at trailing one. EFFECT: enhanced efficiency thanks to improved aerodynamic characteristics of forward rotation. 1 cl, 3 dwg
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