Outer rotor structure for an ac fan

摘要

An outer rotor structure for an ac fan includes a plurality of annular pole plates used to stack on each other to form an outer rotor. Each of the pole plates includes an axial hole, a plurality of poles, at least one aligning member and a plurality of recessions. The aligning member is used to align two adjacent pole plates for stacking so that the recession of the pole plate are turned at a slight angle in stacked relationship with those of the adjacent pole plate. The longitudinally connected recessions form a plurality of assembling grooves adapted to mount ends of metal blades therein at predetermined positions by welding.