The speed of the fan directly affects the air volume generated by the fan, and then affects the cooling function of the fan, but the speed of the fan is the same as the noise value. The faster the fan speed, the higher the noise value. Therefore, it is very important to complete the balance between heat dissipation and noise. The speed of the fan refers to the number of rotations of the fan blade per minute, and the unit is RPM. Of course, the higher the speed, the greater the noise. Simply looking for high speeds may bring huge noise and may not bring corresponding high wind volume due to irrational fan blade planning. Now many fans are initially supporting intelligent scheduling. This is a good plan. Because the chassis is not all high temperature, it is not necessary to work at high speed when the temperature of the chassis is not high. After adjusting the speed to reduce the fan speed, you can Reducing noise, secondly, energy saving can be completed. Determine whether a product is supported. There is a very simple method for intelligent scheduling, which is to see whether the power interface is a 3pin interface or a 4pin interface. The 4pin interface is the fan that supports intelligent scheduling (does not eliminate fraud by unscrupulous merchants).

The higher the speed, the higher the air volume and the higher the noise. The planner should decide the required fan speed according to the air volume required by the channel; other fans that can be intelligently dispatched are also necessary. Balance of heat dissipation and mute. Bearing selection is related to durability. The fan is mainly composed of a fan frame, fan blade bracket and bearing. The planning of the bearing is related to the durability and noise value of an electric fan. The cooling fan is mainly divided into two types of oil bearing and ball bearing. In the meantime, oil-bearing bearings are relatively cheap, but the reliability is slightly worse; the price of ball bearings is higher, and the reliability is correspondingly better. The more popular single ball bearings used to be difficult to control and reliable, but now it is not many.

Among the non-large-brand consumer electronics products, Sleeve Bearing is the most widely used fan bearing. It uses lubricating oil as a lubricant and drag reducer, the benefit is that the price is very low, and the working noise is relatively low in the initial application. The disadvantage is that the bearing is very simple to wear and has a short life. In addition, the long-term use of this bearing, the lubricant in the bearing sleeve simply leaks out, the noise increases, and it will pollute the motherboard and other accessories.