A Brief Discussion on the Heat Dissipation Function of DC Cooling Fans
Category:
Industry Trends
Release time:
2020-08-17
Currently in the market, regarding DC cooling fan The monitoring methods employed include two types: alarm sensors and speed sensors. By using an alarm sensor, an alarm signal can be triggered when the fan speed falls below a certain threshold. Meanwhile, the speed signal output enables real-time monitoring of the fan speed. Obviously, the higher the airflow rate of a DC cooling fan, the greater its heat-dissipating capacity. This is because air has a fixed specific heat capacity; thus, a larger airflow means that more air can carry away more heat per unit of time. Of course, under the same airflow rate, the effectiveness of heat dissipation also depends on the way the air flows.
The speed signal output from the fan circuit typically takes the form of pulses, with each pulse representing one complete rotation of the fan. Such a signal can be directly transmitted via the data bus to the host computer for display. However, in some cases, the speed signal output by the fan does not reflect the fan’s actual rotational speed but rather a multiple of that speed—for example, two, four, or six pulses per fan revolution. In these instances, the signal must undergo processing to generate a true-speed signal that accurately reflects the fan’s actual rotational speed. If you wish to determine whether the displayed fan 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.
The alarm signals output from the fan circuit have two states: “high level” and “low level.” According to the standard positive logic system, the high level generally indicates “fault,” while the low level indicates “normal operation.”
The rotational speed signal output from the fan circuit typically takes the form of pulses, with each pulse representing one complete rotation of the fan. Such a signal can be directly transmitted via the data bus to the host computer for display. However, in some cases, the rotational speed signal output by the fan is not the fan’s actual rotational speed but rather a multiple of its true speed—for example, two, four, or six pulses per full rotation. To obtain a signal that accurately reflects the fan’s actual rotational speed, this signal must first undergo appropriate processing. If you wish to determine whether the displayed rotational 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.
The tachometer signal from a fan is typically output via a three-wire connector. Among the three wires, the yellow and black wires are respectively the +12V power supply and ground, while the wire of another color serves as the tachometer signal output. It’s important to note that in some three-wire fans, the third wire is not the tachometer signal output but rather the speed-control signal line, which transmits a speed-control signal to the fan motor.
The above is the cooling function of the DC cooling fan. For more details, please visit our company’s official website!
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