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The voltage when the cooling fan starts, the way to distingu

The voltage when the cooling fan starts, the way to distinguish the sound and noise of the cooling fan
The main function of the cooling fan is to provide heat dissipation, so that the device will not affect the performance due to the high temperature when the device is in use, so what is the voltage when the cooling fan starts?
 
The starting voltage refers to the minimum voltage at which the fan starts when the fan is suddenly energized.
 
Working voltage refers to the stable voltage that enables the fan to operate normally after being energized, that is, the rated voltage starting voltage. Under normal circumstances, the rated voltage of a DC fan is 12V, and the starting voltage is generally below 7V. Because the voltage provided by the system may be unstable, if the starting voltage is low, the distance between the rated voltage and 12V will be greater, which means that the DC The wider the working voltage range of the fan, it can ensure that the DC fan can operate within the voltage range, and the fan can be started under low pressure under unstable conditions.
 
The starting voltage value can be measured with testing tools such as a multimeter. The low working current of the fan not only reduces the power consumption, but also reduces the heat output of the fan motor, which can increase the service life of the fan. For oil-containing fans, it can also slow down the evaporation of lubricating oil, so the lower the current, the higher the reliability of the fan. The lower the fan current, the lower the shaft power when the air volume and pressure are constant, the actual power delivered to the gas remains unchanged, and the higher the fan efficiency. The working current of the fan can be observed with an ammeter.
 
How to distinguish the sound and noise of the cooling fan
Ruianpu Electronics stated that cooling fans are widely used in industrial products. This is a very common mechanical device. In our daily life, we will find that the cooling fan will make some noise during operation. Some noise from the fan can cause trouble. Why does the cooling fan make noise? In addition to the heat dissipation effect, the operating noise of the fan is also a common concern.
 
Ruiaoole Electronics said that fan noise is the amount of noise generated when the fan is working. It is affected by many factors and is measured in decibels (DB). The measurement of fan noise needs to be carried out in an anechoic room with noise less than 17dB. The anechoic chamber should be 1m away from the fan and aligned with the fan inlet along the fan axis. The spectral characteristics of fan noise are also important.
 
Therefore, a spectrum analyzer is needed to record the noise frequency distribution of the fan. It is generally required that the fan noise is as small as possible without abnormal sound. Fan noise is related to friction and airflow. The faster the speed of the cooling fan, the greater the air volume and therefore the greater the noise. The vibration of the cooling fan itself is also a certain factor. The high-quality fan itself has little vibration, but it will be noisy.
 
It is difficult to overcome. To solve this problem, we can try to use a larger fan. In the case of the same air volume, the noise of the large fan at low speed should be less than the noise of the small fan at high speed. Another factor we tend to overlook is the bearing of the fan. When the fan rotates at a high speed, the friction and collision between the shaft and the bearing are also the main source of fan noise.
I believe that after the above introduction, everyone has an understanding of the voltage when the cooling fan starts, and the reason for the distinction between cooling fan sound and noise. If you have any questions, please go to Ruianpu for consultation.
 
Shenzhen Ruiapple Electronics Co., Ltd. is a professional fan manufacturer with 20 years of R&D, production and sales experience. Main business: cooling fan, DC fan, AC fan, silent fan, centrifugal fan, blower and other full range of cooling and ventilation products as an integrity company, the series of cooling fan products have obtained UL, CUL, CE, CCC, ROHS, etc. International Certification.