The difference between AC fans and DC fans

Cooling fans can be mainly divided into two categories: AC cooling fans and DC cooling fans. And it is mainly used in computer equipment, household appliances, vehicle equipment, mechanical equipment and other fields for ventilation and heat dissipation. Among them, AC cooling fans are mainly used in large equipment such as industrial machinery and medical equipment; DC cooling fans are generally used in small equipment such as computer electronic equipment and household appliances. In addition to these, let’s take a look at the main differences between AC cooling fans and DC cooling fans.

1. Operating principle of AC/DC cooling fan

(1) The principle of DC cooling fan operation is based on Ampere’s theorem. The conductor passes current to generate a magnetic field around it. If the conductor is placed in another fixed magnetic field, suction or repulsion will be generated, causing the object to generate kinetic energy. . Inside the fan blade of the DC cooling fan, a magnetic rubber magnet is attached, which surrounds the silicon steel sheet. The shaft is wound with two sets of coils, and the Hall induction component is used as a synchronous detection device to control a set of circuits. Two sets of coils wound around the shaft work in turn. The silicon steel sheet produces different magnetic poles, and the magnetic poles and the rubber magnets produce adsorption force. When the repulsive force is greater than the static friction force of the cooling fan, the fan blades will start to run.

(2) The operating principle of the AC cooling fan is to directly supply the AC power to work. Through the fixed AC frequency, the silicon steel sheet produces a magnetic field switch, so that the cooling fan blades generate kinetic energy and rotate. The higher the power frequency, the faster the magnetic field switching speed, and the higher the rotation speed of the AC cooling fan.

2. Parameter structure of AC/DC cooling fan

The power consumption of the DC cooling fan is much smaller than that of the AC cooling fan, and the maximum speed that the DC fan can achieve is also higher than that of the AC fan. Secondly, there are magnets in the fan blades of the DC cooling fan, but the AC cooling fan does not; the DC cooling fan has a PCB board, but the AC cooling fan does not; the appearance of AC and DC will be slightly different, and the general AC silicon steel sheet will be more Be thicker.

3. The price of AC/DC cooling fan

In terms of cooling fans of the same grade and brand, general DC fans are more expensive than AC fans. After all, you get what you get for what you pay for, just choose your own suitable cooling fan!


Post time: Jun-17-2022