"Tiny Cooling Fan" internal structure we do not know much about, in fact, its internal structure is composed of two coil winding, one start winding, a running winding, two winding are connected in series, thus forming a three points. Series points common to start "Tiny Cooling Fan" end run to start winding end winding end run end, AC motors also need a starting capacitor, usually a capacity of between 1-2uf, pressure is usually 250v, which refers to Mains AC motor normal use, this "Tiny Cooling Fan" capacitors are polyester capacitors, no positive and negative points.