For a long time, we all know that when the traditional DC brushless fan motor is designed, the fan blade rotor (hereinafter referred to as the rotor) and its shaft core oil bearing, referred to as Sleeve bearing.
The pivot joint is fixed at the base of the stator of the motor to maintain a proper clearance between the rotor and the stator. Of course, there must be a gap between the shaft core and the bearing, so as not to lock the shaft core and fail to work; the stator structure of the motor is somewhat (hereinafter referred to as the stator). After the power is input, the induced magnetic wire will occur between the rotor and the stator, and the control of the drive circuit will make the electric fan motor work. Therefore, in the conventional fan motor structure, as long as the fan rotor, the motor stator and the drive circuit work through the pivot and magnetic field induction between the shaft core and the bearing.
Operation steps of DC cooling fan:
       1.DC cooling fanMainly by the rotor, stator, fan blades and other auxiliary components. There are many semiconductor elements in the control circuit. Now that they are stored in one or more ICs, some manufacturers design and use many models of control motor ICs specifically for fan circuit suppliers. However, the control circuit of different types of IC is different, but its main purpose is to more effectively control and protect the effective function of the coil and the related characteristics of the DC cooling fan.

2. The speed signal output by the DC cooling fan circuit is usually in the form of pulses. Each wave head indicates that the fan rotates once and can be directly provided to the host through the data bus. The speed signal output by some DC cooling fans is not the true speed of the fan, but a multiple of the speed. For example, 2.4 or 6 pulses are generated per revolution and must be processed to form a signal that reflects the true speed of the fan.
If you want to determine whether its speed is the real speed or a certain multiple, you can use a speedometer to measure the actual speed and then compare it with the displayed data.
3. There are two types of monitoring methods for the DC cooling fan itself: alarm sensor and speed sensor. When the fan speed is lower than the threshold value, the alarm sensor can give an alarm signal, and the speed signal output can realize the real-time monitoring of the fan speed. It can be seen that the greater the air volume, the higher the heat dissipation capacity of the DC cooling fan. This is because the heat capacity ratio of air is certain, the greater the air volume, the more heat can be taken away per unit time. The heat dissipation effect is related to the flow mode of the wind, and the air volume is the same.
Advantages of oil bearing DC fan:
1. The price is much cheaper than ball bearings.
2. Resistance to external impact, less damage caused during transportation;
3. Good speed regulation performance. Control is simple. Best efficient fan blade design. Ultra high air volume, high torque motor design.
4. DC cooling fan wind pressure. Large air volume, long service life, low noise and good operation stability.
5. The inverter has low cost, low inverter capacity, high power factor, low loss and high efficiency.
6. High quality bearings, silicon steel sheet, enameled wire, higher reliability.

The above is Jiangshan to introduce the advantages and applications of DC fans. We can customize them according to the special requirements of customers. If you want to know more about DC fans, please contact us ~