DC fans are made of alloy materials and have a lifespan of over 50000 hours of continuous use. The internal structure of the DC fan includes transformers and a main control board that are not affected by voltage fluctuations, resulting in a longer lifespan. Its rotor contains DC cooling fan blades, which are the source of air activity and the axis of the fan. It is used to support the rolling of balanced fan blades, rotor magnetic rings, permanent magnets, key points for driving magnetic level switching speed, magnetic ring outer frame, and fixed magnetic rings. In addition, it also includes supporting tension springs, which are used to fix all the rolling components of the nodule, some of the motor, produce the rolling direction, and can move the key points of the rolling speed. It has good speed regulation performance and simple operation.