Flow fan (single-phase) internal structure is composed by two coil windings, one is to start winding, one is running winding, two windings are connected in series, thus forming a three-point, the series points common to start winding end end run to start winding end run end, AC motor also need a starting capacitor, usually a capacity of between 1-2uf, pressure is usually 250v, which refers to the normal use of mains AC motor, which is a polyester capacitor capacitors, no positive and negative points, there are two connectors, one end connected to the end of the winding start, connect one end of the end of the run winding triangle formation, power (no need to distinguish FireWire zero line) connected winding end of a run (ie, the capacitor the one also connected together), the other a common terminal connected to the grounding line to pick up the motor housing; usually start winding single-phase AC motor windings can be run as if the run winding start winding swap with words (that is, the power of one receive public side of the same, then reconnected to start running side end, this is used as a running start winding winding up), the motor will have a reversal, and this is the only way to change the single-phase AC motor turning achieve! DC motor with the difference is that the AC motor to the motor has three branch windings are wound on the rotor, the spindle is mounted a permanent magnet block, surrounded by the rotor, and does not require the start capacitor, but need brushless, DC motor to change the steering method is more is simple, as long as a change in the positive and negative power input can be achieved!