The cooling fan has the characteristics of simple structure, stable and reliable, low noise and wide range of function selection, so it has applications in many industries, such as metallurgy, chemical industry, light industry, food, medicine and construction, mechanical equipment and other ventilation places. Mainly play the role of ventilation, exhaust emissions and enhance heat dissipation capabilities. Can also play a supercharged effect in the pipeline, the following by the Shenzhen Yi Rong Chuan electronics to share the next little knowledge of the cooling fan for you
Cooling fans are classified into the following two types: AC fans and DC fans. The working principle of different types is also different.
DC cooling fan operation principle: According to the ampere right-hand rule, a conductor passes a current and a magnetic field is generated around it. If this conductor is placed in another fixed magnetic field, suction or repulsion will occur, causing the object to move. Inside the fan blades of the DC fan, a rubber magnet previously filled with magnets is attached. Around the silicon steel plate, the axis part winds two sets of coils, and uses a Hall sensor assembly as a synchronous detection device to control a set of circuits. This circuit makes two sets of coils winding the shaft work in turn. The silicon steel sheet produces different magnetic poles that generate a repulsive force with the rubber magnet. When the repulsive force is greater than the static friction force of the fan, the fan blade naturally rotates. Since the Hall sensor assembly provides the synchronizing signal, the fan blade can be continuously operated. As for the direction of rotation, it can be determined according to the Fleming's right-hand rule.
AC cooling fan operating principle: The difference between an AC fan and a DC fan. The former power supply is AC, and the power supply voltage will change positively and negatively. Unlike DC fan power supply voltage, it must rely on circuit control, so that two sets of coils work in turn to produce different magnetic fields. Because the power frequency of the AC fan is fixed, the speed of the magnetic pole change produced by the silicon steel sheet is determined by the power supply frequency. The higher the frequency is, the faster the magnetic field switching speed is, and the faster the speed will theoretically be, just as the more the number of DC fan poles, the faster the speed. same. However, the frequency should not be too fast, too fast will cause activation difficulties. All of our computer radiators are DC fans. In general, a good fan mainly investigates the air volume, speed, noise, service life, and what kind of fan-bearing bearings are used.
