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Time：2022-03-01Views：0
Our commonly used cooling fans are mainly DC cooling fans and AC cooling fans. Before choosing, maybe we need to understand the difference between these two different cooling fans?
The principle is different:
The power supply of the AC cooling fan is AC, and the power supply voltage will alternately change sinusoidally. However, the power supply voltage of the DC fan is fixed, and it must rely on circuit control to make the two sets of coils work in turn to generate different magnetic fields. Because the frequency of the AC fan is fixed, the changing speed of the magnetic pole generated by the silicon steel sheet is determined by the frequency of the power supply. Same. However, the frequency can not be too fast, too fast will cause activation difficulties. Our computer radiators are all DC fans. In general, a good cooling fan mainly examines the air volume, speed, noise, service life, and what type of fan blade bearing is used.
The air volume is different:
For the cooling fan of the same size, because the motor of the AC fan is large, the fan blade is short, and 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.
Different materials:
The outer frame of the AC fan is generally an aluminum frame, while the outer frame of the DC fan is a plastic frame. The ability to withstand high temperature is different, and the AC fan is better.
Analysis of several reasons for the cooling fan to throw oil
The structure of the brushless cooling fan includes: oil-containing structure, hydraulic structure, ceramic structure, ball structure (also divided into single ball, double ball structure). These structures are used a lot.
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