Let’s talk about the rotational speed of cooling fans and the factors that influence it.
Category:
Industry Trends
Release time:
2020-11-02
The rotational speed of a cooling fan refers to the number of times its blades rotate per minute, measured in RPM. A tachometer is a measuring instrument used to determine the rotational speed of an object; digital display tachometers are commonly employed.
The operating principle of a cooling fan: When a cooling fan is in operation, electrical energy is first converted into mechanical energy. The underlying principle is as follows: When the cooling fan is powered on, current flows through the fan’s coil. According to Ampère’s right-hand rule, we know that a magnetic field will be generated around the coil. Inside the fan blades of the cooling fan, there is a rubber magnet pre-magnetized with a permanent magnetic field. The magnetic field generated by the conductor interacts with the fixed magnetic field, producing an attractive or repulsive force. Once this attractive or repulsive force exceeds the static frictional force acting on the fan—such as the friction in the fan bearings and the aerodynamic drag opposing the rotation of the blades—the fan blades naturally begin to rotate. DC fan With the power supply voltage fixed, a Hall-effect sensing component must be used as the synchronization detection device to control a set of circuits. Only by having these circuits cause the two sets of coils surrounding the axis to alternate in operation can different magnetic fields be generated.
Through the operating principle of electric fans, we know that the primary factors determining the fan’s rotational speed include the fan’s own structural design and component parts, bearing friction, wind resistance experienced by the blade angle, and, of course, external factors as well. Let’s now take a closer look at these factors: Cooling fans rely on air cooling to dissipate heat. The key factors influencing air-cooled heat dissipation are primarily the environmental conditions surrounding the cooling system. When the system environment is relatively sealed, it’s crucial to consider the fan’s static pressure when selecting a cooling fan. If the fan’s static pressure is insufficient, its rotational speed will be significantly affected, leading to a noticeable reduction in airflow and ultimately failing to achieve the desired cooling effect. Therefore, external static pressure is one of the factors that can impact the fan’s rotational speed (though boosted-pressure cooling fans can overcome this issue). Another rather significant factor is the external environment—such as dusty or oily conditions, as well as extreme temperatures. Generally speaking, if a cooling fan isn’t equipped with protective measures, harsh environmental conditions can have a very pronounced impact on its rotational speed.
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