What is the difference between a DC fan and an AC fan?

Our commonly used cooling fans are mainly DC cooling fans and AC cooling fans. Before choosing, perhaps we need to understand the difference between these two different cooling fans? u003cbru003e u003cbru003e u003cbru003e 　　 The principle is different: u003cbru003e u003cbru003e u003cbru003e 　　 The power supply of the AC cooling fan is AC, and the power supply voltage will alternate sinusoidally. However, the DC fan power supply voltage is fixed and must rely on circuit control, so that the two sets of coils work in turn to generate different magnetic fields. The AC fan has a fixed power frequency, so the magnetic pole change speed generated by the silicon steel sheet is determined by the power frequency. The higher the frequency, the faster the magnetic field switching speed, and theoretically the faster the speed, just like the principle that the more poles of the DC fan, the faster the speed. same. However, the frequency should not be too fast, too fast will cause difficulty in activation. All our radiators use DC fans. Generally, a good cooling fan mainly examines the air volume, speed, noise, length of service life, and what type of fan blade bearing is used. u003cbru003e u003cbru003e u003cbru003e 　　 Different air volume: u003cbru003e u003cbru003e u003cbru003e 　　 The cooling fan of the same specification size, because the AC fan motor is large, the fan blade is short while the DC fan is just the opposite. The fan blade is long and the motor is small, so the air flow per unit area is more, the air volume is larger, and the heat dissipation capacity is better. Great u003cbru003e u003cbru003e u003cbru003e 　　 Different materials: u003cbru003e u003cbru003e u003cbru003e 　　 The outer frame of the AC fan is generally aluminum, while the outer frame of the DC fan is a plastic frame. The ability to withstand high temperatures is different, and the AC fan is better