"220V Cooling Fan" is a single-phase AC motor, the use of capacitive phase shift to obtain a rotating magnetic field, the motor is rotated, the rotation of the blades driven by the wind. Use adjust the motor speed control operating voltage, the approach: the use of a series of different inductance reactance, does not change the motor operating voltage; or the use of conduction angle changes triac to adjust the motor operating voltage. Wind of change: one is to use the fan in front of the rotating blade, to change the direction of the wind, one using worm Reducer, the drive rod push "220V Cooling Fan" rotation. Mainly driven by the motor fan rotation, weakening resistance to control by increasing the size of the current to control the motor speed to control the wind speed, "220V Cooling Fan" to two magnets, and a number of magnet, if you do not know the structure is What, you can buy a toy car, where the principle and the fan motor is the same