The DC fan is made of alloy material, ensuring a lifespan of over 50,000 hours of continuous use. Its DC internal structure includes a transformer and a main control board, which are not affected by voltage fluctuations, thus extending its service life. Its rotor comprises the DC cooling fan blades, which are the source of air movement, the fan shaft to support and balance the fan blades, the rotor magnetic ring, the permanent magnet, which facilitates magnetic pole switching and is crucial for adjusting the speed, the outer frame of the magnetic ring, which secures the magnetic ring, and the supporting spring, which fixes all rolling components, including the motor parts, determines the rolling direction, and controls the rolling speed. It boasts excellent speed regulation performance and simple control.