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The DC & AC cooling fans's Operating Principle

1. The DC cooling fans Operating Principle

According to Ampere's right-hand rule, the conductor through the current, it's will appear the magnetic field, if this conductor is placed in another fixed magnetic field, will produce suction or repulsion, causing the object to move. The DC fan blades inside, attached to one of the pre-filled with a magnetic rubber magnets. Surrounded by silicon, two coils wound around the axis portion, and a Hall sensor component as a synchronization detection means for controlling a circuit that the two coils wound around the axis of work rotation. Silicon have different magnetic poles, the magnetic repulsive force and the rubber magnets suction. When the suction fan lice repulsion than static friction, the blades rotate naturally. Since the Hall sensor component provides synchronization signal, fan was able to continue to operate, as its running direction, according Fleming right-hand rule decision.

cooling fans

2. The AC cooling fans Operating Principle

The difference of AC Fans and DC Fans is that the former AC power supply, the power supply voltage alternating positive and negative, unlike the DC fan supply voltage is fixed, must rely on circuit control, make two coils work in rotation to produce different magnetic fields. AC fans due to power frequency is fixed, so the rate of change of magnetic silicon steel produced by the power supply frequency determines the frequency the higher the magnetic field to switch the faster speed will theoretically faster, like Poles DC fan speed, the faster the more the principle of same. However, the frequency can not be too fast, too fast will cause activation problems.

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