Advantages and Applications of Oil-Bearing DC Fans
Category:
Industry Trends
Release time:
2022-04-18
For a long time, we have known that in the design of conventional DC brushless fan motors, the fan blade rotor (hereinafter referred to as the rotor) and its shaft core feature oil-lubricated bearings, commonly known as sleeve bearings.
The pivot joint is fixed to the stator base of the motor, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then activates the motor, causing the electric fan to operate. Therefore, in the conventional design of a fan motor, the fan rotor, the motor stator, and the drive circuit all work together via the pivot joint between the shaft core and the bearings, as well as through magnetic field induction.
Operating steps for a DC cooling fan:
1. DC cooling fan It mainly consists of auxiliary components such as the rotor, stator, and fan blades. The control circuit contains numerous semiconductor components. Nowadays, these components are integrated into one or more ICs; some manufacturers even design and use specialized control motor ICs tailored specifically for fan circuit suppliers. However, different types of IC-based control circuits vary in their design, though their primary purpose remains to more effectively control and protect the coil’s operational performance as well as the relevant characteristics of DC cooling fans.
2. The speed signal output by the DC cooling fan circuit typically takes the form of pulses, with each pulse representing one full rotation of the fan. This signal can be directly transmitted to the host computer via the data bus. However, in some DC cooling fans, the speed signal output is not the actual fan speed itself but rather a multiple of the true speed. For example, the fan may generate 2.4 or 6 pulses per revolution. Therefore, it is necessary to process this signal to obtain a signal that accurately reflects the fan’s true rotational speed.
If you want to determine whether the displayed speed is the actual speed or a multiple of it, you can use a speedometer to measure the actual speed and then compare it with the data shown.
3. There are two types of monitoring methods for DC cooling fans themselves: alarm sensors and speed sensors. When the fan speed falls below a threshold value, the alarm sensor can generate an alarm signal; meanwhile, the speed signal output enables real-time monitoring of the fan’s rotational speed. As can be seen, the greater the air volume, the higher the cooling capacity of the DC cooling fan. This is because the specific heat capacity of air is constant—thus, the greater the air volume, the more heat that can be carried away by the air per unit of time. The cooling performance also depends on the airflow pattern, provided that the air volume remains the same.
Advantages of oil-lubricated bearing DC fans:
1. The price is much lower than that of ball bearings.
2. Resistant to external impact, resulting in fewer damages during transportation;
3. Excellent speed regulation performance. Simple control. Optimally designed high-efficiency fan blades. Ultra-high airflow and high-torque motor design.
4. The DC cooling fan features high static pressure and airflow, a long service life, low noise, and excellent operational stability.
5. The inverter has low cost, low capacity, high power factor, low losses, and high efficiency.
6. High-quality bearings, silicon steel sheets, and enameled wires for enhanced reliability.
The above is Jiangshan’s introduction to the advantages and applications of DC fans. We can customize these fans according to specific customer requirements. If you’d like to learn more about DC fans, feel free to contact us!
Previous: The Knowledge Principles and Internal Structure of DC Brushless Cooling Fans
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Advantages and Applications of Oil-Bearing DC Fans
The pivot joint is fixed at the position of the motor stator base, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then drives the electric fan motor into operation. Therefore, in the conventional fan motor design, as long as the fan rotor, the motor stator, and the drive circuit work together via the pivot joint between the shaft core and the bearings and through magnetic field induction, the motor can operate effectively.
2022-04-18
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