[Did You Know About Cooling?] Do you know what types of DC cooling fans there are?
Category:
Industry Trends
Release time:
2019-05-07
DC cooling fan These are cooling fans powered by DC power sources. Their operation adjusts dynamically according to the heat conditions—running at a slower speed when heat levels are lower. DC fans produce less noise and consume less energy. In most design applications, after the DC cooling fan has been running at an increased speed for several hours, the air temperature typically remains lower than the maximum design temperature.
I. Types of DC cooling fans include:
1. Mixed-flow: Combines the two airflow patterns mentioned above.
2. Axial-flow: The direction of the airflow at the outlet is the same as the direction of the axis.
3. Centrifugal: Utilizes centrifugal force to fling the airflow outward along the blades.
II. Components of a DC cooling fan: fan frame, fan blades, bearings, PCB control circuit, and drive motor.
III. Selection of Plastic Materials and Colors for DC Cooling Fan Frame and Blades:
1. Fan frame + fan blades: Made of black PBT material (plastic heat distortion temperature: 230℃)
2. Fan frame + fan blades: Made of PC material, transparent (plastic heat distortion temperature: 120℃)
3. Fan frame + fan blades: Made of white PBT material (plastic heat distortion temperature: 230℃)
4. Rotational Speed: Rotational speed refers to the rate at which a fan rotates, typically measured in the number of revolutions per minute, or rpm. The rotational speed is influenced by factors such as the number of windings in the electromechanical coil, wire diameter, outer and inner diameters of the fan blade impeller, blade shape, and the type of bearing used. As the rotational speed increases, so does the airflow.
V. Operating Principle of DC Cooling Fans: According to the Right-Hand Rule of Ampère, when a current flows through a conductor, a magnetic field is generated around it. If this conductor is placed in an external, stationary magnetic field, an attractive or repulsive force will be exerted on it, causing the object to move. Inside the blades of a DC cooling fan, a rubber magnet pre-magnetized with magnetic properties is attached. Surrounding the silicon steel laminations, two sets of coils are wound around the shaft’s central axis. A Hall-effect sensor is used as a synchronous detection device to control a circuit that alternately energizes the two sets of coils wound around the shaft. The silicon steel laminations generate magnetic poles of alternating polarity, and these poles interact with the rubber magnet, producing either attraction or repulsion. When the resulting attractive or repulsive force exceeds the static frictional force acting on the fan blade, the blade naturally begins to rotate.
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