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What are the main factors related to the noise generated by the micro cooling fan? How should we reduce the noise of micro fans? Here, the professional technical personnel of Shenzhen Delta cooling fan manufacturers will answer your questions:

1. What are the main factors related to noise generation?
The noise of the micro-fan is related to friction and air flow. The higher the rotation speed and the larger the air volume, the greater the noise. In addition, the vibration of the micro-fan itself is also a factor that cannot be ignored. Of course, high-quality micro-fans will have very little vibration, but the first two are difficult to overcome.

2. How to measure the noise of micro cooling fan?
The noise is the size of the noise generated by the micro fan when it is working. It is affected by many factors, and the unit is decibel (dB). The measurement of the noise of the micro-fan needs to be performed in an anechoic chamber with a noise of less than 17dB, one meter away from the fan, and aligned with the air inlet of the fan along the direction of the rotation axis of the micro-fan, using A-weighted measurement. The spectral characteristics of the micro-fan noise are also very important, so it is also necessary to use a spectrometer to record the noise frequency distribution of the micro-fan. Generally, the noise of the micro-fan is required to be as small as possible, and there should be no abnormal sound.

3. How can we reduce the noise of the micro-fan?
To solve this problem, we can try to use a fan with a larger size. When the air volume is the same, the working noise of the large fan at lower speeds is smaller than that of the small fan at high speeds. Another factor that we tend to overlook is the bearing of the miniature fan. Due to the frictional collision between the rotating shaft and the bearing when the micro-fan rotates at high speed, it is also a major source of micro-fan noise.