[Did You Know About Cooling?] How Do DC Cooling Fans Work?
Category:
Industry Trends
Release time:
2019-03-28
DC cooling fan It’s a cooling device that converts electrical energy into mechanical energy via direct current voltage and electromagnetic induction, thereby driving the fan blades to rotate. Thanks to its numerous advantages—such as excellent cooling performance, fast rotational speed, and long service life—it’s widely used in various applications. So, have you ever taken the time to learn how DC cooling fans actually work? Let me briefly explain it to you now.
Operating steps for DC cooling fans:
1. A DC cooling fan is primarily composed of a rotor, stator, fan blades, and other auxiliary components (such as bearings and retaining rings). The control circuit typically incorporates numerous semiconductor components, which are now often integrated into one or more ICs. Some manufacturers even specialize in designing and producing a wide variety of motor-control ICs specifically tailored for use in fan circuits. However, the control circuits of different IC models vary, though their primary goal remains the same: to provide effective coil operation and meet the specific requirements of DC cooling fans by offering more efficient control and protection.
2. The speed signal output from the DC cooling fan circuit typically takes the form of pulses, with each pulse representing one full rotation of the fan. Such a signal can be directly transmitted via the data bus to the host computer for display. However, in some DC cooling fans, the speed signal output does not reflect the actual rotational speed of the fan but rather a multiple of the true speed—for example, two, four, or six pulses per fan revolution. Therefore, this signal must undergo processing before it can accurately represent the fan’s actual rotational speed. If you wish to determine whether the displayed speed is the actual speed or a multiple thereof, you can use a tachometer to measure the actual rotational speed and then compare it with the data shown on the display.
3. There are two types of monitoring methods for DC cooling fans themselves: alarm sensors and speed sensors. An alarm sensor can generate an alarm signal when the fan speed drops below a certain threshold, while the speed signal output enables real-time monitoring of the fan’s rotational speed. Thus, it is evident that the greater the airflow of a DC cooling fan, the higher its heat-dissipating capability. This is because the specific heat capacity of air remains constant—thus, a larger airflow means that more air can carry away more heat per unit of time. Under the same airflow conditions, the effectiveness of heat dissipation also depends on the way the air flows.
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