The characteristics of the DC cooling fan itself are different from other products. The DC cooling fan actively agitates the air and accelerates the air flow, so it also sucks in dust at the same time. There are two main aspects of inhaling dust. One is sucking into the bearing, and the other is sucking into the rotor and stator. Inhaling dust has more or less influence on the cooling fan. Common methods generally start from the following two aspects.
1. When designing, increase the height where the motor is mounted on the outer frame to allow the motor to sink, reduce the distance between the stator and the rotor, and reduce the entry of dust.
2. Using double ball bearings, the balls have a certain degree of dust resistance, and the bearings are not susceptible to serious interference.
In addition to the above two aspects to protect the cooling fan from dust itself, adding a dust-proof net to the fan is also a very effective way. Because the cooling fan with a dust-proof design is used less, most manufacturers do not have such a mold, so it is more advisable to add a dust-proof net when the mold is not opened.
For manufacturers of DC cooling fans, the first factor is to allow the fans to ventilate, and heat dissipation is the first factor, but it allows the cooling fans to perform their due function for a long time, that is, reliability. This is an important factor to measure the strength of a cooling fan manufacturer. The reliability of the cooling fan will consider the following factors.
1. Temperature rise: ambient temperature, the temperature of the motor itself, generally the temperature rise of the motor does not exceed 110 degrees during operation).
2. Current: It is necessary to fully consider the withstand capability of the chip. When designing, the actual current will be lower than the nominal current of the chip.
3. Withstand voltage: In view of the voltage stability of the customer's products and the ability to withstand the voltage of the cooling fan, the voltage of some products is not stable and will be high.
4. Anti-interference: Some products have strong static electricity in the environment where the cooling fan is installed, and the cooling fan needs to be protected.
5. Waterproof: Some products deal with humid environments or work in water, we need to consider the waterproof level of the cooling fan.
