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What is the working principle of the cooling fan

What is the working principle of the cooling fan?
The working principle of the cooling fan is realized by energy conversion, namely: electric energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principle is generally divided into multiple forms, and the performance of the fan will be different if the circuit used is different. So how to measure the cooling fan? Cooling fan manufacturer-Ruiapple takes you to see what technical indicators the cooling fan has:
Air volume
Air volume refers to the total volume of air discharged or taken in by the cooling fan per minute. If it is calculated in cubic feet, the air volume unit is CFM; if it is calculated in cubic meters, it is CMM. The air volume unit often used by cooling fans is CFM (about 0.028 cubic meters per minute).
Air volume is the most important indicator to measure the heat dissipation capacity of a cooling fan. Obviously, the larger the air volume, the higher the heat dissipation capacity of the cooling fan. This is because the heat capacity ratio of the air is constant, and the larger the air volume, that is, the more air per unit time can take away more heat. Of course, the heat dissipation effect is related to the way the wind flows under the same air volume.
 
Wind pressure
Wind pressure and air volume are two relative concepts. Generally speaking, in consideration of cost-saving by the manufacturer, to design a fan with a large air volume, some air pressure must be sacrificed. If the fan can drive a large amount of air flow, but the wind pressure is small, the wind cannot blow to the bottom of the radiator (this is why some fans have high speed and large air volume, but the heat dissipation effect is not good). On the contrary, High wind pressure often means that the air volume is small, and there is not enough cold air to exchange heat with the heat sink, which will also cause poor heat dissipation.
 
speed of the fan
Fan speed refers to the number of times the fan blades rotate per minute, and the unit is rpm. The fan speed is determined by the number of turns of the coil in the motor, the operating voltage, the number of fan blades, the inclination angle, the height, the diameter and the bearing system. Speed ??and fan quality are not necessarily related. The speed of the fan can be measured by the internal speed signal or externally.
With changes in application conditions and ambient temperature, fans with different speeds are sometimes required to meet the demand. Some manufacturers have deliberately designed cooling fans with adjustable fan speed, which are divided into manual and automatic. The main purpose of manual is to allow users to use low speed in winter to get low noise, and use high speed in summer to get good heat dissipation. Automatic temperature control radiators generally have a temperature control sensor, which can automatically control the fan speed according to the current working temperature. If the temperature is high, the speed will be increased, and if the temperature is low, the speed will be reduced, so as to achieve a dynamic balance, thereby allowing wind noise. Maintain an optimal combination with the heat dissipation effect.
 
Fan noise
In addition to the heat dissipation effect, the working noise of the fan is also a common concern. Fan noise is the size of the noise generated by the fan when it is working, which is affected by many factors, and the unit is decibel (dB). When measuring the noise of the fan, it needs to be carried out in an anechoic room with a noise of less than 17dB, one meter away from the fan, and aligned with the fan's air inlet along the direction of the fan's shaft, using A-weighted method for measurement. The spectral characteristics of fan noise are also very important. Therefore, it is also necessary to record the frequency distribution of fan noise with a spectrum analyzer. Generally, the fan noise is required to be as small as possible, and there should be no abnormal noise.
 
Fan noise is related to friction and air flow. The higher the fan speed and the greater the air volume, the greater the noise caused, and the vibration of the fan itself is also a factor that cannot be ignored. Of course, high-quality fans will have very little vibration, but the first two are difficult to overcome. 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 speed is smaller than that of a small fan at a high speed. Another factor that we easily overlook is the bearing of the fan. As the fan rotates at a high speed, there will be friction and collision between the shaft and the bearing, so it is also a major source of fan noise.
 
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 heat dissipation and ventilation products as an integrity enterprise, the series of cooling fan products have obtained UL, CUL, CE, CCC, ROHS, etc. International Certification.
 
Shenzhen Ruiapple Electronics Co., Ltd. was established in 2000. For 20 years, it has focused on R&D, manufacturing and sales of DC AXIAL FAN, AC AXIAL FAN, CENTRIFUGAL FAN, and blower ( BLOWER), AC to DC fan (EC FAN), DC motor (DC MOTOR), AC to DC (EC MOTOR) motor and other full series of cooling and ventilation products as a whole series of integrity enterprises.
 
Shenzhen Ruiapple Electronics Co., Ltd. has its own brand "RUIAPPLE", which is registered as a patent trademark by the government. The company passed the ISO9001-2015 system certification in the early years. The series of heat dissipation fan products have obtained UL, CUL, CE, CCC, ROHS and other international certifications.
 
Shenzhen Ruiapple Electronics Co., Ltd. is a professional fan manufacturer (manufacturing factory Mianyang Anpu Electric Co., Ltd. was established in 2009 and China Electronic Technology City Mianyang Economic Development Zone, Sichuan), with 20 years of R&D, production and sales experience. Our R&D, quality control and production always pay close attention to new technologies and new methods to pursue the goal of zero defects, continuously improve product quality and stability, improve products, innovate products, and lean production. Our product quality and production technology have always been in the forefront of the industry, with complete product specifications and comprehensive market competitive advantages.
 
Shenzhen Ruiapple Electronics Co., Ltd. has a strong R&D team, which has been dedicated to product research and development for many years, providing customers with complete heat dissipation solutions, striving for perfection, improving processes, and optimizing performance. It is targeted at consumer goods, office equipment, aerospace industry, automotive electronics, Ventilation system, machinery equipment, communication equipment and other industries conduct special research and provide products for the industry characteristics of the application of heat dissipation and ventilation products.