How does the DC fan work?

Today, Ruiapple will introduce the operation steps of DC fans.

1. The DC fan is mainly composed of rotor, stator, fan blades and other auxiliary components (such as bearings, retaining rings, etc.). There should be many semiconductor components in the control circuit, which are now stored in one or more ICs, and some Manufacturers specially design and manufacture many types of control motor ICs for fan circuit design and use.

However, different types of IC control circuits are different, but their main purpose is to provide effective coil functions and DC fan-related characteristics for more effective control and protection.

2. The speed signal output from the DC fan circuit is usually in the form of pulses. Each wave head means that the fan has rotated one circle. Such signals can be directly provided to the host for display through the data bus. The speed signal output by some DC fans is not the real speed of the fan, but a multiple of the speed. For example, each revolution generates 2, 4, or 6 pulses, so it must be processed to form a real speed signal reflecting the fan.

If you want to distinguish whether the speed is the real speed or a multiple, you can use the tachometer to measure the actual speed and compare it with the displayed data.

3. There are two types of monitoring methods for DC fans: alarm sensor and speed sensor. The alarm sensor can give an alarm signal when the fan speed is lower than a certain threshold, and the speed signal output can realize real-time monitoring of the fan speed. . It can be seen that the higher the air volume, the higher the heat dissipation capacity of the DC fan.

This is because the heat capacity ratio of the air is constant, the larger the air volume, that is, the more air can take away more heat per unit time, and the heat dissipation effect is related to the flow of the wind under the same air volume.

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.