Fan Bearing Types

Fans are an important component type used to keep your system within its recommended temperatures, ensuing that your electronics work optimally and last their full operational lifetime. Put simply, a fan works by rotating its shaft with a bearing.

A bearing is a mechanical part used between the moving object such as the fan’s rotating shaft and the housing that shaft is moving within. The bearing’s aim is to limit the mutual mechanical movement between shaft and housing during operation and then reduce the friction between these moving parts. There are 5 popular bearing types used in the rotating shaft in fans currently -

  • Ball - Assembled with multiple balls. They are not easily worn and can be operated in any orientation and tolerance at higher temperatures. However, ball bearing fans have a more complicated structure and are more expensive
    Ball%20Bearing

  • Hydrodynamic - Separated by liquid or air. Generally used for long-distance high-speed operation and rotation.

  • Sleeve - Separates the motion device (shaft) with a sleeve. Sleeve bearing fans are inexpensive, rugged and simple, with less acoustic sound during operation, but require regular maintenance, such as refueling.
    Sleeve%20Bearing

  • Vapo-Bearing - supplied specifically by Sunon. Adds a magnetic effect (magnetic levitation) to the bearing to reduce sound and shaft stability

  • The Sintec - SINTEC bearing contains two precisely aligned bearing positions and a lubricant layer. After the shaft is started, a dynamic lubricating film is generated to prevent friction between the bearing and the shaft, so that high temperatures and aging can be prevented, and the high-viscosity lubricant penetrates the porous bearing to effectively reduce wear.

  • omniCOOL - The omniCOOL system alleviates the negatives of both ball bearing and sleeve bearing fan designs, resulting in a robust fan that is quiet, cost-efficient and can operate at any angle. By negating the drawbacks from the other two types of fan construction, the omniCOOL system can be deployed to replace either type of fan and bring the benefits of both fan types to any design. Applications that favored sleeve-based designs now have an alternative that is also low-noise, rugged and reliable, while also offering a longer lifetime and the ability to be used in any orientation. Those applications that required higher-performance ball bearing designs can now keep the higher temperature resistance and lower wear and tear while gaining improved impact resistance and a more rugged construction. Instead of being forced into a compromise, designers can have access to a fan construction that delivers the best of both worlds.
    image
    image

Link to omniCOOL fans:
https://www.digikey.com/products/en?keywords=omnicool

Resources:
https://www.cuidevices.com/catalog/resource/omnicool-system-improve-longevity-performance-dc-fans.pdf

https://www.cuidevices.com/omnicool-system

https://www.cuidevices.com/blog/fan-bearing-types-weighing-the-pros-and-cons

Additional information regarding fan bearing types and teardown photos of representative examples can be found here.

1 Like