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Miniature cooling fan noise causes and solutions?
Release time:2018-3-15 Browse times: 5569
What are the main factors related to the noise generated by the micro cooling fan? How should we reduce the noise of the micro fan? Here by Shenzhen Feng Wang cooling fan manufacturers of professional and technical personnel to answer for you:

DC cooling fan
 1. What are the main factors related to noise production? The
Micro fan noise is related to friction and air flow. The higher the speed of rotation and the greater the amount of air flow, the greater the noise caused. In addition, the vibration of the micro-fan itself cannot be ignored. Of course, the high-quality miniature fan's own vibration will be very small, but the first two are difficult to overcome.

 2. How to measure the noise of the micro cooling fan? The
The noise is the size of the noise generated by the micro-fan during operation. It is affected by many factors and the unit is decibel (dB). When measuring the noise of the micro fan, it needs to be performed in an anechoic chamber with a noise level of less than 17 dB, one meter away from the fan, and aligned with the inlet of the fan along the direction of the axis of the micro fan, and measured in an A-weighted manner. The spectral characteristics of the micro fan noise are also very important, so it is also necessary to record the noise frequency distribution of the micro fan with a spectrum analyzer. Generally, the noise of the micro fan is required to be as small as possible and no abnormal sound can exist.

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