New understanding of DC cooling fans

Dc fan heat fan actually is widely applied in our life, just a lot of people are hard to call out the full name of it, and I don't know its type, door frame and door leaf plastic material and color how to choose, more do not know one of its speed and working principle, today we can for you don't know where the detailed explain it again.

The DC cooling fan is a cooling fan powered by DC power. Its operation changes with the heat. Running at a slower speed, the DC fan produces less noise and consumes less energy. In most design requirements, the air temperature is usually lower than the maximum design temperature after several hours of accelerated operation of the DC cooling fan. We will give you a comprehensive introduction of the DC cooling fan, so that you can have more understanding and understanding of it.

Types of DC cooling fans:

1, mixed flow: with the above two air flow modes.

2. Axial flow: the outlet direction of air flow is the same as the axis direction.

3, centrifugal: the use of centrifugal force will air flow along the blade thrown out.

The composition of dc cooling fan: fan frame, fan blade, bearing, PCB control circuit, drive motor.

DC heat dissipation fan frame and fan blade plastic material and color selection:

1, fan frame + fan leaf: PBT raw material black (plastic thermal deformation temperature 230℃)

2, fan frame + fan blade: TRANSPARENT PC raw material (plastic thermal deformation temperature 120℃)

3, fan frame + fan leaf: PBT raw material white (plastic thermal deformation temperature 230℃)

Rotational speed: The rotational speed of a fan is measured by the number of rotational turns within 1 minute, that is, RPM. The rotational speed is related to the number of turns of electromechanical winding, wire diameter, outer diameter and bottom diameter of fan blade wheel, blade shape and bearing used, etc. The increase of rotational speed increases the air volume accordingly.

Dc cooling fan working principle: ampere right hand rule, conductor through the current, magnetic field will be generated around, if the conductor is placed in another fixed magnetic field, it will produce suction or repulsion, causing objects to move. A rubber magnet is attached inside the fan blade of the DC cooling fan. Around the silicon steel sheet, the shaft part is wound with two sets of coils, and a Hall induction module is used as a synchronous detection device to control a set of circuits, which make the two sets of coils wound around the shaft work in turn. The silicon steel plate produces different magnetic poles, which 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 rotates naturally.