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[Did You Know About Cooling?] Factors Affecting the Service Life of DC Brushless Fans

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Industry Trends

Release time:

2019-05-22

　　Usually, DC brushless fan The service life of the equipment is affected by the operating environment and working pressure. If the cooling fan operates in a high-temperature environment, it will accelerate the evaporation of the lubricating fluid in oil-immersed bearings, causing the device to shrink, increasing friction, and boosting coil resistance. This leads to a vicious cycle in which heat generation rises sharply, further elevating the temperature.
　　Dust can cause uneven distribution of the fan blade’s mass, increase friction, and elevate air resistance, thereby impairing its own heat dissipation. It also hinders the heat exchange between the heatsink and the surrounding air, potentially leading to electrostatic discharge that damages components and equipment. Harsh operating environments can significantly reduce the fan’s effectiveness and drastically shorten its lifespan.
DC brushless fan
　　And if DC brushless fan When work pressure is high, the fan’s rotational speed increases, leading to faster bearing wear, greater heat generation in the stator winding coils and electronic components, and consequently a shorter service life.
　　We are choosing. DC brushless fan At that time, the first thing to consider is lifespan—how long it can last. So... DC brushless fan What factors affect its lifespan? Primarily, it’s the bearing, followed by the ambient temperature and the balance of the fan blades.
　　1. Bearings: The double-ball bearing has a rated lifespan of 50,000 hours, while the oil-lubricated bearing has a rated lifespan of 3 hours (under normal temperature and conditions).
　　2. Ambient temperature: The higher the temperature, the shorter the lifespan—especially for cooling fans with oil-lubricated bearings, which are particularly sensitive to high temperatures.
　　3. Fan blade balance: If the fan blades are poorly balanced, they’ll shake violently. Over time, this will first result in noise, and eventually may cause the fan to jam and stop rotating altogether.
　　Although we’ve done our utmost to ensure the fan blades are as balanced as possible during mold design, if the blades still vibrate during operation, we have a high-precision dynamic balancing machine to correct and fine-tune them, ensuring smoother operation and longer service life. This is something that many cooling-fan manufacturers tend to overlook.

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