DC0802012L2B datasheet(4/38 Pages) ETC2

4 / 38 page

Wakefield-Vette

Revision A.3

DC FANS

Dual Ball Bearing

The two ball bearing system is the industry standard for long life with a L10 of 70,000 hours.

Other bearing choices, like sleeve or single ball are susceptibility to impact damage which is

why they can not support the high life requirement of most applications. One advantage of

two ball bearing systems is that due to the small point load of the balls, they require less

power to start rotation as they have less stiction (starting friction) than other bearing system

which means the minimum starting power can be achieved with a lower current.

Bearing Lubrication, Wear and Failure

Bearing failure is the most common reason for a fan failure which is why bearing selection is

so important. The bearing failure can be cause by multiple factors including lack of

lubrication, excessive temperature or direct damage (excessive shock/vibration). A two ball

bearing fan is better sealed to prevent the leak of the lubrication fluid then some of the other

bearing systems. All fans typically will get noisier and rotate slower as the bearing systems

wear and this can be a good indicator of pending bearing future.

Page 4

Bearing Information

DC0802012L2B Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers