How much do you know about the cooling fan?

　　The specifications of the cooling fan for the landing experiment are based on the specifications of the cooling fans of different sizes. The height of the landing varies from 30-50CM. The specification for the landing experiment is: three wooden boards with a thickness of 10CM, and the fan can not be damaged. For some products to do landing experiments, the request is more stringent, such as installing the cooling fan in the product, landing 100CM, the cooling fan can not be damaged.

　　In particular, some products are heavier and fall faster, and some products are not square but cone-shaped. Therefore, when the sharp end falls on the ground, all the stress points are concentrated at one point, and the cooling fan is more likely to be destroyed. For products that need to be tested on the ground, the cooling fan cannot use commonly used PBT materials. It is recommended to use high quality materials, such as PC materials or PPS materials that have better toughness.

　　The landing experiment guarantees that the DC fan belongs to the motor series, which is a high-speed rotating electronic product. Various abnormal changes may be found during the operation, such as no rotation, abnormal noise (also known as noise), rotation The easiest and most controversial problem of DC fans is the noise problem. What is the reason?

　　When choosing a DC fan, the bearing is very important. Among them, oil-bearing DC fans are the most prone to noise. This bearing has low cost and low bearing accuracy. It mainly depends on the smooth function of grease to maintain quiet running sound. When high temperature, dust, etc. After the interference of grease, the DC fan gradually showed abnormal noise.

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