Cooling fan according to the voltage can be divided into different types of AC and DC fans two fans, so in addition to their different voltages, its internal structure is any different?
　　First, the internal structure of the AC fan in series with each other by two coil windings (start winding and run winding), so there are three intersections, the series of points on the public side, AC motors require a starting capacitor, the capacity of a small pressure generally 250V, this capacitor is no positive and negative, and only two interfaces, a connection start winding end, a connection end of the winding operation, composition triangle, connect one end of the power cord winding end run, the other end connected to the common terminal, the bottom line access motor housing. AC DC fan with fan except that the DC fan has three windings are wound on the rotor mounted on the stator magnetic blocks, surrounded by the rotor, no start capacitor need brushes. Just change the positive and negative power supply fan can be reversed.