What are the key aspects to pay attention to when it comes to cooling fans?
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Release time:
2021-10-11
The thinner the cooling fan, the thinner its bearing will be, and the smaller the contact area between the bearing and the shaft core. As the high-speed rotating blades drive the shaft core to spin, friction occurs between the bearing and the shaft core. If the bearing is rougher or lacks sufficient precision, the noise generated by this friction will be greater. Often, due to space constraints, we are compelled to use thinner cooling fans. While making this choice can solve space issues, will it bring about other problems? Here are several key aspects that need to be taken into account.
1. As for cost, ultra-thin cooling fans are likely to be somewhat more expensive than their thicker counterparts, due to the higher manufacturing complexity.
2. For thinner cooling fans, airflow and air pressure are lower, and their power consumption is also lower compared to thicker ones. If you try to match the airflow of the thinner fan with that of the thicker one, the cost might actually be even higher.
When choosing the thickness, it’s certainly best to opt for medium-thickness cooling fans—though they come at a higher cost, their construction is relatively more stable. Thicknesses such as 10 mm and 25 mm are very commonly used.
For certain special environments where the temperature in the center of the installed cooling fan is very high, we’d like the cooling fan to be able to withstand high temperatures and dissipate heat effectively. So, what’s the maximum temperature that this cooling fan can tolerate?
Typical conventional cooling fans operate within a temperature range of -10°C to 70°C. However, in special environments where temperatures exceed 80°C, a custom design is required. This involves using high-temperature-resistant ICs and reducing the operating current of the motor to lower its own temperature. Additionally, the enameled wire, plastic materials, and conductors must also be made from high-temperature-resistant components, and the temperature must not exceed 100°C.
When the temperature rises too high, both high-temperature-resistant cooling fans and ordinary cooling fans will experience a significant reduction in lifespan. Therefore, when designing products, it’s best to keep the ambient temperature below 70 degrees Celsius whenever possible.
Under the condition that the heatsink material is the same, airflow is the most important metric for evaluating the cooling performance of an air-cooled heatsink. Obviously, the greater the airflow, the higher the heatsink’s cooling capacity. This is because air has a fixed specific heat capacity—thus, a larger airflow means that more air can carry away more heat per unit of time. Of course, under the same airflow conditions, the cooling effect also depends on how the air moves.
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