Traditional brushless dc fan motor carbon brush design, is the blade rotor (rotor) and the shaft core through the oil-retaining bearing, referred to as "SLEEVE bearing, fixed pin joint in the center position of the motor stator, rotor and the stator maintain an appropriate gap between core shaft and bearing, of course, also be sure to have a gap between the existence of, don't lock shaft core die not;  The stator structure part of the motor (stator for short), after the power input, will generate induction magnetic field lines between the rotor and stator, and the control of the drive loop makes the fan motor run.  Therefore, the traditional fan motor structure, only a fan blade rotor, a motor stator and a drive loop, and through the shaft core and bearing hinge, with the magnetic field induction operation