[Did You Know About Cooling?] How can you tell the difference between DC and AC fans based on their bearings?
Category:
Industry Trends
Release time:
2019-03-27
Many people think that DC fans and AC fans are essentially the same, but in fact, there are still differences between them. Below, we’ll analyze these differences, starting with the fan’s critically important bearing.
Generally, the types of bearings commonly used in radiator assemblies include sleeve bearings that rely on sliding friction, ball bearings that utilize rolling friction, and a combination of both bearing types. In recent years, many manufacturers of cooling fans have introduced numerous new bearing technologies—such as magnetic levitation bearings, hydrodynamic bearings, magnetic core bearings, and Rill bearings—all of which represent improvements upon these basic bearing designs. However, their underlying operating principles remain unchanged. On conventional air-cooled radiators, oil-impregnated bearings and ball bearings are the most widely used. Dual-ball bearings are considered high-end products, characterized by high precision, superior quality, and a relatively high price—making them “three-high” products. Oil-impregnated bearings can meet a wide range of operating conditions and boast an exceptionally long service life; they’re also relatively inexpensive. However, their overall quality tends to be somewhat average.
In terms of operating principle DC fan It’s also different from a conventional AC fan. When current flows through a conductor, it generates a magnetic field. If this conductor is placed in another magnetic field, an attractive or repulsive force will be produced, causing the object to move. Inside the fan blades, rubber magnets are arranged around silicon steel sheets. The central shaft is wound with two sets of coils, 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 shaft to alternate in operation. The steel sheets generate opposite magnetic poles, which interact with the rubber magnets via attraction and repulsion. Once the attractive or repulsive force exceeds the fan’s static friction, the blades naturally begin to rotate. Thanks to the synchronous signals provided by the Hall-effect sensor, the blades can keep rotating continuously.
Previous: [Did You Know About Cooling?] How Do DC Cooling Fans Work?
Next: [Did You Know About Cooling?] Teaching You How to Choose a Good DC Fan
Related News
On these busy days, I’m grateful to have you all fighting side by side! At this company dinner, everyone can put aside their daily hustle and enjoy some wonderful moments together. Let’s raise our glasses and chat freely—may delicious food and laughter accompany us as we strengthen our team spirit and build an even warmer sense of unity!
2025-08-27
The weekend team-building event by the seaside came to a perfect close! With sunny beaches and endless laughter, the team collaborated seamlessly in fun-filled games, relaxing their minds and bodies amid the soothing sound of ocean waves. Filled with renewed energy, we’re ready to join hands and tackle new challenges together!
2025-08-25
The newly installed display cabinets at the Huizhou company are gradually being filled up...
2025-08-21
Jiangshan Lai Electronics wishes you a happy Mid-Autumn Festival 2022!
On a day of blooming flowers and a full moon, When families are reunited in joy, May our land send you warm wishes for a happy Mid-Autumn Festival!
2022-09-10
Jiangshan wishes you a healthy and happy Dragon Boat Festival 2022!
The fragrant aroma of zong leaves fills the air on May 5th— May our heartfelt wishes bring you peace and well-being this Dragon Boat Festival! May our land send its best wishes for your health and happiness this Dragon Boat Festival 2022!
2022-06-03
May the land and rivers bring you joy as we celebrate Labor Day!
Salute to the workers! May our country and its people bring joy and happiness to all our customers and employees on this special occasion!
2022-05-01
Advantages and Applications of Oil-Bearing DC Fans
The pivot joint is fixed at the position of the motor stator base, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then drives the electric fan motor into operation. Therefore, in the conventional fan motor design, as long as the fan rotor, the motor stator, and the drive circuit work together via the pivot joint between the shaft core and the bearings and through magnetic field induction, the motor can operate effectively.
2022-04-18
FRIENDLY LINK：
3rd Floor, 59 Yanshan Avenue, Yanchuan Community, Yanluo Street, Bao 'an District, Shenzhen
Which DC fan wholesale manufacturer is better, the recommended DC fan supplier rankings, the price of brushless DC fans, and what are the