Patent attributes
A cooling fan includes: a fan housing having an air outlet for discharging air and an air inlet for introducing air; a rotation shaft having a lower portion rotatably supported by the fan housing; a rotor fixed to an upper portion of the rotation shaft; a stator arranged inside the rotor with a predetermined gap with respect to the rotor; an impeller connected to an outer periphery of the rotor and rotated together with the rotor; a printed circuit board (PCB) arranged below the stator to connect power to the stator and having mounted thereon various circuit components of the motor driving circuit; and a PCB housing box connected to the rear surface of the fan housing through a plurality of bridges and accommodating the PCB in a center thereof.
