"Mini Air Cooling Fan" brush motor works and the application, the source of the following wind to bring you the technical explanation, as detailed below ... depending on the power supply, the motor has a DC motor and AC motor types. Computer use "Mini Air Cooling Fan" for DC motor, power supply voltage is + 12V, speeds between 1,000 to 10,000 rev / min. DC motor is a DC energy into mechanical energy of rotating machinery. "Mini Air Cooling Fan" by the stator, rotor and commutator three parts, visible, due to the presence of the commutator, the armature coil by the electromagnetic torque remains unchanged, in effect making the electromagnetic torque armature to rotate,