User Manual

HYDRO-DYNAMIC-BEARING TECHNOLOGY
We defined HDB to Hydro Dynamic Bearing. An oil seal design that has a higher reliability
and advantage than conventional fan motor design.
1. High revolution precision, low vibration noise
2. Fluid seal design provide extremely long life span
3. Surface tension effect, runs more smoothly with no friction, extremely quiet
Fluid seal design is achieved through the use of oil surface tension and hydrodynamic
pumping forces provided by grooves. Bend area is centralized oil and prevented oil leakage
out of motor (oil leakage is main problem of sleeve bearing, short life time) . Friction
between shaft and HDB will be down due to herringbone structure reaction(friction between
the metal is disadvantage of ball bearing, noise & waste heat problem). So HDB conquer
sleeve & ball bearing disadvantage to become more reliable & quiet technology for
Top-notch fan. Such design concept is successful and applicative on HDD, and we can see
a reliability application in it.
HDB, Ball, & Sleeve comparison
Sleeve Ball Hydro-Dynamic
revolution precision mediocre good best
vibration noise mediocre loud quiet
life span (hrs) 30,000 50,000 >150,000
waste heat high high low
Cost low high high
HDB Design Principles
Oil surface tension and hydrodynamic pumping forces provided by grooves, no friction, extremely quiet