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[Thermal Management Insights] A Brief Discussion on DC Cooling Fans

Category:

Industry Trends

Release time:

2019-09-02

DC DC fan The input is direct current, and typical DC voltages include: 3V, 12V, 24V, 32V, 48V, 5V, 60V, 25.5V, 42V, 18V, and 15V. The operating principle is based on Ampère’s right-hand rule: when a current flows through a conductor, a magnetic field is generated around it. If this conductor is placed within a stationary magnet, an attractive or repulsive force will be produced, causing the object to move. Inside the blades of a DC fan, rubber magnetic strips that have already been magnetized are attached. These strips are arranged around silicon steel laminations. At the central axis, two sets of coils are wound, and a Hall-effect sensor is used as a synchronous detection device to control a circuit. This circuit causes the two sets of coils wound around the central axis to alternate in operation. The silicon steel laminations generate magnetic poles of alternating polarity, which interact with the rubber magnets to produce attractive or repulsive forces. When the magnitude of these attractive or repulsive forces exceeds the static frictional force acting on the fan blades, the blades begin to rotate naturally. Thanks to the synchronous signals provided by the Hall-effect sensor, the blades continue to rotate smoothly. As for the direction of rotation, it can be determined using Fleming’s right-hand rule.
Based on their operating principles, we can see that DC cooling fans have permanent magnet strips inside their rotors, whereas AC cooling fans do not. Additionally, DC fans are equipped with a PCB board, while AC fans do not. In terms of the fan blades and frame, both the frame and blades of DC fans are typically made of plastic—primarily PBT material, often used in a fiber-reinforced form at around 30%. In terms of performance, DC fans consume significantly less power than AC fans. Moreover, AC cooling fans can achieve much lower rotational speeds compared to DC cooling fans; however, AC fans tend to be more expensive than DC fans.
  The above is a brief sharing of insights on distinguishing between noise and abnormal sounds in cooling fans. Shenzhen Jiangshanlai Electronic Technology Co., Ltd. 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.
If you have any needs, feel free to consult us.

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