There are many brands of cooling fans on the market, and if someone who does not know how to buy them, it is difficult to distinguish the quality of the fans. How to distinguish the quality of DC fans?
Frame: There are aluminum alloy and plastic on the frame, but the ordinary AC fan is made of aluminum alloy, and the DC fan is made of plastic (the 1751 DC fan frame is aluminum alloy). But even the frame of the same aluminum alloy is thick and thin. Moreover, the central shaft in the aluminum alloy frame is very important. The good cooling fan manufacturers use copper central shafts, and the poor cooling fans generally use aluminum alloy materials.
Circuit board: Good cooling fan circuit boards are more complicated. Of course, the materials used can be compared at a glance. There are very many small parts, while poor cooling fan parts are few, so I think the circuit is very simple.
Copper wire: The copper wire of a good cooling fan is rough and sturdy. It uses manual winding, while the copper wire in a poor cooling fan is very thin. Of course, it is only for the same product. The smaller the fan, The copper wire will be thinner. Thick wire, but only one bad wire, very thin and simple.
Wire: The wires in a good cooling fan are made up of many thin wires staggered together, and they are quietly composed. Cooling fans are an electronic parts industry that will not decline. There are also many cooling fan manufacturers. Of course, the quality is also uneven. We can There are two aspects to verify the quality of the cooling fan, one is whether the parameters of the cooling fan can meet the standard, and the other is whether the appearance data of the cooling fan is of high quality. The parameters can be tested, and the information can only be seen through professional verification.
Ball: There are more introductions, just remember, the ball is much better than the oily one.
The material of the fan blade: It is also easy to distinguish. The stator of a good cooling fan is usually a steel stator, which is very strong.
Motor diameter: Due to the existence of the motor and the bearing, there must be no air flow through the blind zone in the center of the DC fan main shaft. The diameter of the main shaft will determine the size of this blind zone. A large number of spindle diameters mainly depend on the power of the fan motor-the high power of the motor requires a larger stator winding coil, which must take up more space, without longitudinal contraction (increased height), and then must contract (increased) area).
Blade curvature: In addition to a certain curvature in the cross section, the blades of the DC DC fan do not extend vertically in the radial direction on the overhead plane, but extend slightly in the direction of rotation.
