DC cooling fanIt refers to a cooling fan powered by a DC power supply. Its operation changes with the heat. If it runs at a slower speed, the DC fan will produce less noise and consume less energy. In most design requirements, the air temperature is usually lower than the maximum design temperature value after the DC cooling fan runs for several hours.

The types of 1. DC cooling fans are:

1. Mixed flow type: it has the above two air flow modes.

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

3. Centrifugal type: use centrifugal force to throw the airflow out along the blades.

The composition of the 2. DC cooling fan: fan frame, fan blade, bearing, PCB control circuit, drive motor.

3. DC cooling fan fan frame and leaf plastic material and color selection:

1. Fan frame fan blade: 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 blade: PBT raw material white (plastic thermal deformation temperature 230 ℃)

4. speed: speed refers to the speed at which the fan rotates, usually measured by the number of turns in 1 minute, namely: rpm. The rotating speed is related to the number of turns of electromechanical winding, wire diameter, outer diameter and bottom diameter of fan blade impeller, blade shape and bearing used, etc. The rotating speed increases and the air volume increases accordingly.

The working principle of the 5. DC cooling fan: Ampere's right-hand rule, the conductor passes through the current, and a magnetic field will be generated around it. If the conductor is placed in another fixed magnetic field, suction or repulsion will be generated, causing the object to move. Inside the fan blade of the DC cooling fan, a rubber magnet filled with magnetism is attached in advance. Around the silicon steel sheet, two sets of coils are wound on the axis part, and a Hall induction component is used as a synchronous detection device to control a set of circuits, which makes the two sets of coils wound on the axis work in turn. The silicon steel sheet produces different magnetic poles, which generate attraction and repulsion with the rubber magnet. When the suction repulsion is greater than the static friction of the fan, the fan blades naturally rotate.