How to judge the quality of the DC cooling fan?

Many manufacturers and suppliers in the choice of DC cooling fans, are not how to choose, generally find a few manufacturers, and then take back the sample, the test can be turned to OK, and then choose a cheaper manufacturer supplier, with this as the standard. In fact, the cooling fan needs more than just a day to turn, several years or even decades to maintain the heat dissipation characteristics, no damage, no fading, can be called a good quality DC cooling fan?

1. See the current ------ the same speed, the same voltage, the same air volume. Dc cooling fan with small current is better. Because the smaller the current, it means that the fan loss is smaller, that is, the power consumption is small, the main reason for the small power consumption is: 1> . The product has strong magnetic permeability. 2> Motor enamelled wire loss is good. 3> Copper content is high D lubricant activity is high.

2. Listen to noise ------ The same speed, the same voltage, the smaller the noise of the DC cooling fan is better, because the low noise is mainly related to the fan blade, bearing, oil, assembly structure and so on. < 1> The better the fan shape design, the greater the air volume will be, and the lower the noise, which is a technical work, but also a test of the ability of technical personnel. < 2> The higher the accuracy of the bearing, the smaller the friction with the shaft core, the more accurate the size match, and the lower the noise, of course, which is greatly related to the material of the bearing. 3> The noise is low, it means that the friction is small, the life of the bearing and the shaft will be longer, and the life of the DC fan will be longer.

3. Measuring vibration ------ fans of the same specifications and speed, DC cooling fan with small vibration is better, DC cooling fan, is a high-speed running part, vibration must be some, no manufacturer can guarantee no vibration, if a manufacturer tells you that their products have no vibration, it is used to deceive ghosts, don't believe it. The smaller the vibration, the better, the smaller the vibration, the smoother the fan operation, the smaller the loss of bearings and shafts, and the less volatile oil or ball wear, the longer the life of course.