Abstract: A fan including: a fan frame, a casing, fan blades, a magnetic piece, silicon steel sheets, a coil, a circuit board, a nano-bearing, and a rotational shaft of a motor. The fan frame is disposed at a bottom of the fan. The casing is disposed above the fan frame. The fan blades encircle the casing and are staggered with respect to one another. The magnetic piece is in a ring shape and is attached to an inner wall of the casing. The silicon steel sheets are stacked together, and disposed in a circle inside the magnetic piece. The coil is wound on the silicon steel sheets. The nano-bearing is disposed in a center of the silicon steel sheets. The rotational shaft of the motor is disposed inside the nano-bearing. The circuit board is connected to the coil wound on the silicon steel sheets.