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![[Did You Know About Cooling?] How can you tell the difference between DC and AC fans based on their bearings?](/npublic/img/s.png "[Did You Know About Cooling?] How can you tell the difference between DC and AC fans based on their bearings?")
Many people think that DC fans and AC fans are essentially the same, but in fact, there are still differences between them. Below, we’ll analyze these differences, starting with the fan’s critically important bearing. Generally, the types of bearings commonly used in heat sink fans fall into three categories: sleeve bearings that rely on sliding friction, ball bearings that use rolling friction, and a hybrid combination of both. In recent years, many manufacturers of cooling fans have introduced numerous new bearing technologies—such as magnetic levitation bearings, hydrodynamic bearings, magnetic core bearings, and Roto-Flux bearings—all of which represent improvements upon these basic bearing types. However, their underlying operating principles remain unchanged. Ordinary fans...
As the economic standards of living in China continue to rise, DC fans are becoming increasingly widespread in our daily lives—this is precisely the main driving force behind the proliferation of DC fan suppliers today. So, among so many suppliers, how can we choose a high-quality DC fan? 1. Select based on the bearing type: Generally speaking, DC fan bearings fall into two main categories. One is the ball-bearing type, collectively referred to as ball bearings. The other is the oil-lubricated type, collectively referred to as oil-bearing bearings. The key difference between them is that ball bearings have a longer service life and produce less noise, but they come with a higher price tag and stricter requirements. In contrast, oil-bearing bearings have a shorter service life than ball bearings.
1. Rotor Lock Protection 1.1 Several fan blades are connected and fixed together to restrict their rotation. If the fan and electronic components remain undamaged, once the restraining components are released, the fan can automatically restart and resume rotation. 1.2 For fans with low current or featuring an Auto-start function, when power is applied and the fan is rotating, the fan blades will be locked. After 72 hours of continuous operation, releasing the locked blades will immediately trigger the fan to restart automatically, indicating that the fan is functioning normally. 1.3 For fans with high current or lacking an Auto-start function, prolonged locking is not recommended; otherwise, the fan may overheat and get damaged. 2. Polarity Protection Voltage
1. Current: The current is measured after the device has been rotating continuously for 3 minutes. 2. Rotational Speed: The rotational speed is measured after the device has been rotating continuously for 3 minutes. 3. Starting Voltage: The voltage at which the fan begins to operate once the “ON” switch is turned on. 4. Input Power: The input power is measured after the device has been rotating continuously for 3 minutes. 5. Locked Current: For fans that can be locked, the locked current is determined by locking the fan in fresh air and measuring it over a period of 3 minutes. 6. Airflow and Pressure Data Measurement: The measurement of airflow and pressure data is conducted according to the “AMCA Standard” or DIN 24163 regulations. This data is obtained in a dual-pressure chamber, and the pressure data exerted on each side of the pressure chamber must be recorded. 7. Noise Standards: The noise standard test is conducted in accordance with DIN 45635, with measurements taken in a soundproof room. The microphone is positioned one meter away from the fan.
1. Working Principle: DC cooling fan principle: It operates by converting electrical energy into mechanical energy through direct current voltage and electromagnetic induction, thereby driving the fan blades to rotate. The coil and IC continuously switch, inducing the magnetic ring to rotate the fan blades. AC fan principle: It is driven by an alternating current power supply. The voltage alternates between positive and negative, generating a magnetic field entirely without relying on circuit control. The power supply frequency is fixed, and the rate of magnetic pole changes produced by the silicon steel sheets is determined by the power supply frequency. The higher the frequency, the faster the magnetic field switches, and theoretically, the faster the rotational speed will be. However, the frequency cannot be too high either; otherwise, it will become difficult to start the motor. 2. Structural Components
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