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[Did You Know About Cooling?] The Role of Blades in DC Fans

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News Center

Industry Trends

Release time:

2019-05-27

    DC fan Through the conversion of electrical energy into mechanical energy via direct current voltage and electromagnetic induction, the fan blades are set in motion. Therefore, the fan’s housing and blades together form an integral unit that is absolutely essential. Most people recognize the importance of these two components—but what exactly is their relationship and how do they work together?
First, blade curvature: Within a certain range, the greater the blade curvature, the greater the kinetic energy of the gas at the same rotational speed—resulting in higher airflow and higher wind pressure. At the same time, the resistance experienced by the blades also increases, thereby requiring greater torque from the motor.
Second, the motor diameter: Due to the presence of the motor and bearings, the central portion of the DC fan’s spindle inevitably has a blind zone where no airflow passes through. The diameter of the spindle thus determines the size of this blind zone. The spindle diameter is primarily determined by the power rating of the fan motor—higher-power motors require larger stator winding coils, which naturally occupy more space. When it’s impossible to expand the fan vertically (by increasing its height), the only option left is to expand it horizontally (by increasing its area).
Third, blade curvature: In addition to having a certain degree of curvature in their cross-sections, the fan blades do not extend straight radially when viewed from above; rather, they curve slightly in the direction of rotation, taking on a specific arc shape. If the blades were to extend straight radially, the airflow generated by the rotating cooling fan would scatter at the outlet, resulting in a short air delivery distance and a lack of concentrated “force.” By contrast, the slightly curved design currently adopted in many products ensures that the blown air remains concentrated within a column-shaped space directly in front of the outlet, thereby increasing both the air delivery distance and the air pressure.
Fourth, blade spacing: If the distance between blades is too small, it will cause airflow disturbances, increase friction on the blade surfaces, and reduce fan efficiency. Conversely, if the distance between blades is too large, it will lead to increased pressure loss and insufficient wind pressure.
Shenzhen Jiangshan Lai Electronic Technology Co., Ltd. was founded in 2005 in Shenzhen, China. It is a large-scale enterprise integrating customization, R&D, manufacturing, sales, and service of DC brushless motors, DC cooling fans, DC brushless fans, DC stand fans, boosted cooling fans, miniature cooling fans, DC cooling fans, DC blowers, and non-standard fans. We are a wholesale manufacturer and supplier of DC fans. Our products are best-selling in Guangdong Province—including Shenzhen, Guangzhou, and Dongguan—as well as in Fujian, Zhejiang, and Jiangsu provinces.

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