Release time:

2022-04-11

DC fans belong to the cooling fan industry, and cooling fans are divided into DC fans and DC fans. AC fan referred to as ACFAN, DC fan referred to as DCFAN, belonging to the fan industry the most common existence. Therefore, the DC fan means a direct current fan. Its purpose is to cool heated electronic equipment, and its application range is very wide. This cooling fan will be used in refrigerators, refrigerators, air conditioners and other household appliances used in our daily lives. The bearings of DC fans are roughly divided into two types, one is the form of balls, collectively referred to as ball bearings. The other is oil bearing, collectively referred to as oil bearing. The difference between them is that the ball bearings have a long service life and low noise, but the price is relatively high. The service life of oil-containing bearings is 1/3 shorter than that of ball bearings. After using for a period of time, some noise may be generated, but the price is cheap. 2. Appearance selection: From the appearance point of view, the whole should be relatively thick, and the color should be relatively pure, especially black, which is not important for color fans. There is no fleece edge on the frame blade edge. Look at the thickness of the fan blades, there will not be too much deformation when you pinch the outer frame by hand. 3. Listen to noise: Some high-speed may have electromagnetic sound. If there are other sounds, it means that the quality is not very good. If the speed of the DC fan is not very high, for example, the speed of the 7cm fan does not exceed 3500RPM, but the sound of the wind greatly indicates that the quality of the fan is too poor. 4. Look at the two parameters on the outer package. According to the direction of the air flow in and out of the cooling fan, it can be divided into axial flow fan, centrifugal fan, mixed flow fan, cross flow fan, blower, and then from its different power supply forms can also be divided into DC cooling fan and AC cooling fan, so today we will Focus on the differences and differences between axial flow fans and DC cooling fans. First, when the axial fan is operated, the blades drive the air flow in the axial direction. Axial fans are usually installed on the cabinet of electrical equipment and sometimes integrated on the motor. Due to the compact structure of the axial flow fan, it can save a lot of space, easy to install and widely used. The DC cooling fan is a rotating machine that converts electrical energy into mechanical energy. The principle of operation is that according to the rules of Ampere's right hand, a conductor passes a current to generate a magnetic field around it. If the conductor is placed in another fixed magnetic field, an attractive or repulsive force will be generated, causing the object to move. In the blade of the DC fan, a rubber magnet filled with magnetism in advance is attached. Around the silicon steel plate, the shaft is partially wrapped with two sets of coils, and the Hall induction component is used as a synchronous detection device to control a set of circuits, so that the two sets of coils wound around the shaft work in turn. The silicon steel plate produces different magnetic poles, and this magnetic pole and the rubber magnet produce suction. When the suction force is greater than the static friction of the fan, the fan blades rotate naturally. Because the Hall sensing component provides a synchronization signal, the fan blades can continue to operate. The DC cooling fan can only operate with DC power. The voltage used must be the same as the rated voltage of the DC cooling fan. The axial flow fan also includes an AC alternating current cooling fan and a DC direct current cooling fan. They are all closely related.