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thirteen billion four hundred and eighteen million seven hundred and twenty-seven thousand three hundred and forty

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mobile phone: thirteen billion four hundred and eighteen million seven hundred and twenty-seven thousand three hundred and forty

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[cooling classroom] common ways of heat dissipation [2020-06-28 17:17:50]
Generally speaking, according to the method of taking heat from the radiator, the radiator can be divided into active cooling and passive cooling. In fact, the natural effect of the radiator is directly proportional to the natural heat release
[cooling class] Introduction to IP grade of cooling fan [2020-06-19 16:45:21]
Not afraid of the challenge of extreme natural environment, the dust-proof and water-proof fan series products encounter more and more serious environmental damage all over the world. Sunon fan independently developed and designed "dust and water-proof fan series products", which can achieve the maximum dust and water-proof level of IP68. The motor can be protected reasonably by using the patented motor to protect the motor from dust and water
[cooling class] speed regulation cooling fan, PWM duty control ratio [2020-06-15 17:13:45]
What is PWM control ratio: PWM is the abbreviation of pulse width modulation circuit, which has been widely used in industrial control and single chip microcomputer. Intel combines the CPU temperature detection of the motherboard with that of Intel, and applies it to the precise control of cooling fan speed, and achieves good results. In addition to the original temperature measuring circuit, a PWM is added to the main board with PWM function
[cooling class] how to distinguish the color of cooling fan wire [2020-06-09 16:28:24]
What do the colors of the wires of the cooling fan mean? Here we take Sunon as an example to illustrate. (Sunon's industry standard) Red: power + pole; Black: power supply pole; yellow: FG alarm signal, speed detection function; white: Rd alarm signal, high and low frequency; blue: PWM duty cycle, speed regulation power
[cooling class] what is the dead corner of cooling fan and how to improve it [2020-06-04 16:22:35]
Recognize the dead angle of cooling fan: which factors cause the fan dead angle? The so-called fan dead angle means that the fan can not start according to the specified voltage when it is placed at certain angle. When the fan wants to turn but does not rotate, the test method is to place the fan poles in front of Hall IC in sequence, and then slowly adjust the voltage until it is started. If each pole starts before the specified voltage value, it means
What is aerodynamics and how to calculate aerodynamics [2020-06-03 16:09:32]
Aerodynamics refers to the effective energy provided to the air by the cooling fan per unit time. It can be calculated by the following formula: l (kw) = (K / k-1) * (pt1xq / S120) ((pT2 / pT1) * [(k-1) / k-1]) = 3.5 (10330 * q / 6120) (([10330 + mmaq] / 10330) * 0.285-1) l: aerodynamic force; Q: air volume (m * 3 / min); pT2: absolute pressure (kg / m * 2)
Influence of humidity and temperature on cooling fan [2020-06-02 15:35:33]
The influence of temperature and humidity on the cooling fan root air specific weight formula: r = 0.465 ([pa-0.378 * φ * 17.5] / TA) y: specific weight [kg / m * 3j = 1.2kg / m * 3 @ 20 ℃ PA: steam oxygen saturation pressure [MHG] = 17.5mmhg @ 20 ℃, φ: humidity [%], Ta: absolute temperature = 273 + TC, so the specific weight of air per unit volume is directly proportional to humidity and inversely related to temperature
[cooling class] what is the difference between the noise of ball bearing of cooling fan after 3000-5000 hours [2020-06-02 15:26:33]
Since the cooling fan starts to run, the bearing is gradually worn, and the gap becomes larger; the fan will be unbalanced and vibrate, which is the main source of noise; therefore, the noise is directly proportional to the service time of the fan.
Performance comparison between four pole and eight pole cooling fan [2020-06-01 11:24:16]
Four and eight are the number of North and south of the rubber magnet of the cooling fan. According to the weight of the fan blade and the required speed, the rubber magnet is selected to fill the four or eight poles. Usually, the higher the pole is, the faster the speed is, and the higher the impedance of the coil is, which is helpful to reduce the number of turns. However, it is not always appropriate that the higher the number of coils, the better the performance is, and it is improper to be too high or lower. Generally, in small fans, due to the small fan blade area and high demand
[cooling class] what is the difference between the performance of five blades and seven blades [2020-06-01 11:12:51]
Customers usually pay most attention to the main parameters of the cooling fan, such as the exhaust volume, noise, function loss, etc. when purchasing the cooling fan, customers seldom care about the fan blade, and the performance of the main parameters has been determined for a long time, but it is not clear to all that what is the difference between five blades and seven blades; when the speed limit is reached, using seven fans can increase the air flow, but the disadvantage is wind
Operating principle of AC fan [2020-05-29 11:52:01]
AC cooling fan power supply for AC, the power supply voltage will be positive and negative alternating. It is necessary to rely on circuit control to make two groups of coils work in turn to produce different magnetic fields. Because the power frequency of AC fan is fixed, the change speed of magnetic pole generated by silicon steel sheet is determined by the power rating. The higher the frequency is, the faster the switching speed of magnetic field will be, and the faster the rotating speed will be in theory, just as the number of DC fans is more
Sunon automotive electronics solutions [2020-05-28 15:02:38]
The scope of automotive electronics is not limited to self driving travel parts, and future intelligent vehicles can also be included in it, such as unmanned cars, unmanned aircraft, full-automatic transport warehouses, etc.; and among them, it also includes the top technologies such as optics, communication and information. With the development trend of more customized and diversified products, automotive electronics must be narrow and airtight

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