"DC Fan" mechanical structure consists of the following major components: A. Frame: plastic repression, generally square, round. B. Blade: outside on the fan rotor, outer rotor permanent magnet plastic magnetic ring; C. Magnetic stripe: plastic disks, magnetic stripe formed with the magnet after magnetization magnetizing machine. D. Stator: "DC Fan" fixed non-rotating parts. Usually four large teeth constitute a quadrupole, quadrupole wound on the two sets of coils. E. Rotor: the rotating blades and magnetic stripe together constitute part of this fan. "DC Fan" electrical configuration consists of the following major components: A. Stator: generates a rotating electromagnetic field. B. Rotor: The same as - a rotating electromagnetic field generated by the rotor speed operation section C.. 9141: HALL voltage generator, HALL voltage amplifier, Schmitt trigger, driver amplifier, etc - to achieve the motor control.