Abstract: A brushless direct current (BLDC) motor assembly may include a wheel provided to receive and discharge outside air, and having a coupling region defined therein, a rotor fixedly coupled in the coupling region to be integrated in the coupling region, the wheel being rotated by torque generated according to rotation of the rotor by a magnetic force, and a stator generating a magnetic force by interacting with the rotor, and comprising a stator core, a coil, and an insulator disposed between the stator core and the coil for integral coupling with the stator core and the coil, in which the stator may allow the insulator to be coupled to the rotor after a shaft is fixed to the insulator.