Device for controlling the speed of rotation of the fans

Fan rotation speed technologies

Avno has already passed the days when passive cooling was used in computers. Such computers were absolutely silent, but unpromitable. As the productivity of processors and other PC components grew, their energy consumption and, as a result, the PC components became more “hot”. Therefore, the processors began to be equipped with massive radiators, and soon fans were added to them, that is, the passive cooling of the processors could no longer provide the required heat sink to maintain proper temperature, which was due to which they began to use air cooling. As the clock frequencies of processors growth, the efficiency of the heat sink increased, which was achieved due to more massive radiators and faster fans.

Increasing the maximum speed of rotation of the fans entailed an increase in the level of the noise they created. It is known that with an increase in the speed of rotation of the fan from the value of N1 to N2, the level of noise created by him increases from the value of NL1 to NL2, and:

Why buy fan controller?

Fans are necessary to cool your system and maintain the performance of your components. The presence of fan controller in your system greatly facilitates temperature monitoring. Most controllers allow you to manually adjust the speed of rotation of the fans and achieve the perfect balance of coolness and silence.

Before buying a new fan controller or fan concentrator, it is necessary to consider several things. Some fan controllers have different characteristics, number of channels and, of course, software.

Aesthetics of the fan controller

Most of the time of the fan controller can be hidden. Sometimes these fan controllers are designed so that they can be inside your system and not look like a bird’s nest on your body is on your body.

PIN support

Various fan controllers support different types of contacts of the fan; usually it will be three or four-contact.

3-pin models are more complex than the old 2-pin models, with two contacts for negative and positive currents and the third contact to control revolutions.

The 4-pin conclusion performs all of the above, but with the addition of an additional fourth contact, which is designed for latitudinal-pulse modulation (PWM), which works as a switch that is constantly turned on and off, regulating the amount of energy on the fan.


The number of channels may vary from the controller to the controller. It is important to make sure that you get a controller with the right number of channels. Noctua supports only three channels in this list, so always follow this indicator!


If any of these devices has control elements, they are often very simple with disabilities of configuration. Software, such as ICUE for Corsair Commander, excellent and gives you real flexibility with configurations. Other control options include touch screens, such as Thermaltake controller.

Why do you need to change the speed of the cooler

Fan rotation speed is not a random indicator. It is set by the motherboard that receives information from BIOS. Accordingly, in BIOS’, settings are installed, which, based on the temperature indicators of one or another node, regulate the speed. This should be, but, as practice shows, intellectual adjustment is not effective, and often the blades rotate, if not a maximum, then it is close to this.

In this regard, it occurred to users to reduce the speed of rotation of the cooler on the processor manually. This can be done in BIOS, through third.Party utilities or by cunning manipulations with fan power. Obviously, many will not like the last option, and only advanced users can resort to it.

Important! It is worth noting that all methods can not only reduce, but also increase the speed of the cooler, if it seems that it copes with cooling inefficiently.

Another reason why the acceleration of the cooler may be needed is a forced increase in the processor clock frequency. Many gamers decide to disperse the chipset in order to get great productivity, and this invariably causes an increase in TDP (heat release indicator), which means, dispersing the processor, you need to disperse the cooler and the cooler.

Ways to accelerate the cooler on the processor

Cool speed adjustment is a useful procedure that can reduce noise when working or improve the quality of cooling. The above was mentioned that the motherboard with BIOS is engaged in this process. Therefore, an obvious solution will be to change the bios settings to control the cooler.

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Adjustment in BIOS

The first stage is the entrance to BIOS. In most situations on the laptop when loading, press the Del button or one of the F buttons. Often during the boot, a black screen with white inscriptions flickers, where you can notice the desired button in the corner.

Further, you need to enter the Advanced point and look at what is written. It should be understood that different versions of BIOS may differ in the names of certain modes, so this text contains common solutions. In addition, BIOS has several speed control modes. Which of them to choose depends on the personal needs of users.

  • Cha Fan Duty Cycle. Setting the speed of the cooler in percentage (from 60 to 100%).
  • Chassis Fan Ratio. A mode that allows you to configure the operation of an additional cooler, provided that the internal temperature of the systems is not higher. Auto. Speed will be regulated by automation. 60-90%-manual adjustment, based on the maximum possible.
  • Chassis Q/ System Fan (Speed) Control is the same utility that “intellectually” selects the speed of the blades. It has two states. Disabled (disabled) and enabled (inclusive). If the utility is disconnected, then the rotation is carried out at the maximum.
  • CPUFAN2 TMAX sets the temperature of the chipset, after which the cooler will accelerate to the maximum level (adjustable from 55 to 70 degrees).
  • Cpufan Start Temperature sets a temperature minimum at which the blades spin at a small speed.
  • CPUFAN DUTY CUCLE. Direct adjustment that will help to increase or reduce rotation speeds. Settings are carried out as a percentage of maximum (60-100%). Can also be called Manualfanspeed.
  • CPUFAN CONTROL. Intellectual control capable of lowering or increasing the cooler’s speed on the processor depending on the level of heating of the latter. There are no settings here, the function can be turned on or disabled.
  • CPU FAN RATIO. Setting up the number of speeds of the blades before the chipset was heated to a given (initially) maximum temperature. Settings as a percentage. From 20 to 90%. That is, in this case, you can reduce the speed of the cooler if it works very loudly, but at the same time the chipset does not heat up.
  • Smart fan idle TEMP. The ability to set the lowest revolutions.
  • Smart Fan Target is similar to paragraph 7. Found in boards from the brand MSI. Additionally, here you can set the parameter, starting with what temperature of the BIOS processor begins to independently perform speed adjustment.

As the list shows above, there are a lot of settings of the fan in the BIOS, but practice suggests that using them is not too useful, since they most often work incorrectly. In addition, to change the settings, you will have to enter the BIOS each time and change something, then start the device and check the effectiveness of the changes. It is much easier to put special software and without unnecessary difficulties set up speed and immediately see the result.

Another point that is inappropriate to set up through BIOS is not always the fan is connected to the motherboard. Some not the most successful assemblies are made in such a way that there is no connection between the fee and the cooler, which means that it will definitely not be possible to adjust its work in BIOS. In this case, special programs will come to the rescue, and the most popular of them is Speedfan, which is described below.

Important! To configure a computer cooler for accurate operation using third.Party utilities, it is recommended to turn off automatic adjustment in BIOS, otherwise it will interfere with the work of a special software.

How does an Oscillating Fan work?

Speed ​​Speed ​​in Speedfan

Adjust the speed of the processor cooler is much more convenient in special programs. If you study forums, then most often experienced users mention Speedfan. Software is free, takes a minimum of space, but it works very efficiently. The only minus of the program is not Russified, but this should not be a serious problem, since the Inteiis is intuitively understandable.

After installing the program, a small window with several tabs will be in front of the user’s eyes. In order to change the speed of rotation of the cooler, you do not need to go somewhere. All the necessary information is contained in the first window called Readings.

The CPU Usage line shows the loading of the chipset and nuclei. Next to it is the Automatic Fan Speed ​​inscription with the ability to put a checkmark. This is how automatic adjustment is activated, but it is not interesting, since there was no point in putting any software in this case.

Next, you can see two blocks. In the first inscription FAN 1-5. The current turnover of coolers is displayed here.

It is important to understand that FAN 1 does not necessarily correspond to the processor fan. It all depends on which nest it is connected. It can be a fan on a power supply or video card. You can understand what is applied to, only experimentally: when adjusting the speed, look, the temperature of which node changes. You can do this visually by removing the cover of the system and tracking, the acceleration of which cooler occurs when speed increases.

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How To Make Cooling Fan Speed Control using One transistor

Having calculated the correspondence of inscriptions and fans, we look at the second block with TEMP 1-5 inscriptions. The current temperature of the node that corresponds to the cooler is displayed here.

Next, we lower our eyes and see the inscriptions of PWM 1-6 (in different versions of the inscription program can change, for example, on Speed ​​01-06) with arrows up and down. Understand how to lower and increase the speed is very simple. Just click on the right arrow and select suitable values. Keep the result or reload something is not required. The utility immediately changes momentum, and this is its charm. To understand how the indicators are changing, you can directly at the time of configuration.

20V electric motor speed controller

A high.Quality and reliable rotation speed controller for single.Phase collector electric motors can be made on common details in just 1 evening. This scheme has a built.In overload detection module, provides a soft start of a controlled engine and a stabilizer of the rotation speed of the motor. Such a unit with voltage works both 220 and 110 volts.

Fan rotation speed regulators: types and rules for connecting

In this article we will talk about what types of controllers exist, and talk about how to connect the fan speed controller yourself.

The fan is an important working unit in any electrical equipment that requires constant cooling. Without this device, work is impossible, for example, refrigeration or welding equipment, control cabinets, as well as supply and exhaust systems in household or industrial premises. In almost all areas of the use of fans, it may be necessary to adjust the speed of its rotation. This is necessary in order to increase the life, or to reduce the noise issued during rotation. This opportunity gives a special regulator (controller). In this article, we will talk about what types of controllers exist, as well as how to connect the fan speed controller yourself.

device, speed, rotation, fans

There are the following types of fan regulators that differ from each other according to the principle of action:

Thyristor controllers are used to adjust the number of revolutions of single.Phase AC fans. The speed of rotation of the blades varies to the larger or lesser side depending on the size of the average chosen tension coming from the regulator.

Simistor elements are a type of thyristor. Their distinctive feature is the use of the simistor, which is similar to two parallel thyristors in parallel. Thyristor and symistor regulators allow you to smoothly increase, as well as reduce the rotation speed of the fan blades, and are used, as a rule, with an operating voltage of 220V. They differ in small size and low cost. Their main disadvantages are a high level of interference, an increase in acoustic noise and a decrease in the duration of the fan, as well as a decrease in the rotating moment with a decrease in the speed of rotation. These shortcomings are fatal and are the result of the principles of work. Therefore, it makes sense to use such regulators only in household appliances that work for a short time.

OMRON inverter is an example of a frequency control regulator of the fan rotation speed.

The second type. Frequency regulators (frequency converters) got their name due to their ability to change the current frequency, which leads to a proportional change in the fan rotation speed. Over, in addition to the current frequency, they can also change the voltage from 0 to 480V, as well as the angle of phase shift between the current and the voltage, which allows you to regulate not only the speed of rotation, but also such an important parameter as a rotating torch of the fan electric motor. Due to this, the range of adjustment of the fan speed is significantly expanded, its long.Term operation is ensured at all operating modes. Such elements are installed mainly in industrial facilities, and in everyday life they can be found, for example, in high.Power air conditioners; The main advantages of such regulators: the ability to work with 3-phase equipment, accurate control of the frequency and the moment of rotation with the possibility of managing the computer, the ability to regulate complex algorithms using external sensors, a lower level of interference and high durability of the fan compared to the previous type of regulator. It is worth mentioning that a lower level of interference and high durability are provided only in case that the frequency converter is equipped with a sinusoidal filter. Otherwise, the reliability of the system will be even lower than that of a thyristor regulator. The main drawback of frequency regulators. High cost and large size. Therefore, they are used in expensive equipment, usually high capacity.

Examples of sinusoidal filters for frequency converters. Skybergtech throttle.

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The third type. Transformer type regulators are the best solution for most situations where you need to adjust the fan speed manually. The change in the output voltage occurs due to switching the transformer windings by the switch. In this case, there is no distortion of the form of sinusoids of the supply voltage and, as a result, no interference arises that affect both other devices and the engine of the fan itself. Over, a reduced output voltage of such a regulator leads to an increase in the fan resource, and not to a decrease, as in the case of a thyristor regulator. Moderate cost and the largest of all types of regulators reliability allows you to use this type in all applications with a capacity of several watts to several kilowatts. A distinctive feature of such devices is the possibility of long.Term continuous operation at supported objects and resistance resistance. It is allowed to work such regulators with single.Phase or three.Phase electric current. It is worth emphasizing the unique possibility of some models to give a galvanic denouement with the network, which allows you to use such regulators, for example, in medical institutions. This type of regulators usually have dimensions and weight comparable to frequency converters. The disadvantages of such regulators include the complexity of external control. But with stationary placement with manual control, this deficiency is completely overlap with their advantages. Also, in comparison with the frequency regulator, it should be noted a decrease in the moment of rotation with a decrease in the speed of rotation, which can lead to difficulties when starting in difficult operating conditions. But this is compensated by several times less price, which makes this type of regulator an excellent solution in most household and industrial applications.

Consider transformer fan speed controllers using the ARW line from the European manufacturer Breve Tufvassons.

These regulators are installed in industrial ventilation and heating systems. Adjustment of single.Phase fan engines is carried out by changing the voltage. For five.Speed rotation settings, the handle on the case panel serves. The regulators are equipped with an independent switch that is highlighted when the regulator works, as well as a built.In fuse. The regulator is placed in a plastic case, has an IP54 protection degree and is able to operate at a maximum ambient temperature up to 40 ° C.

At one’s own risk

When experimenting with a computer cooling system, it should be understood that a complete stop or a strong drop in rotation speed of coolers can lead to overheating of the device they cooled. To a greater extent this applies to the central processor and video card. All other fans usually have an auxiliary function, however, if the level of cooling of the named devices still depends on their operation, then their management must be careful.

However, even the old motherboards and video cards were equipped with a mechanism for overheating, which instantly turns off the supply of power when they reach the temperature of their heating of a certain value. But this should not be a reason for testing the reliability and efficiency of this mechanism.

In other words. Do everything at your own peril and risk.

Management of the culer of the video card

To control the speed of rotation of the quilting coolers, you can use the appropriate tool drive tool or a third.Party program specializing in this. We are interested in the latter, t.To. They are usually not tied to video cards of a particular manufacturer (although there are such). The most famous utility from this category is MSI AFTERBurner. We will work with her.

  • We launch the MSI AFTERBurner program on behalf of the administrator.
  • The adjustment tools we need are the lower left corner in the “fan” unit. By default, the option of automatic control of the fan rotation speed operates in automatic mode. Therefore, first of all, it needs to be switched to manual control mode, for which you need to squeeze two buttons. “cars” (the one with the letter “a”) and “determined by the user” (with the image of a man):
  • Immediately after this, the Fan Speed ​​slider is unlocked, which is located above the buttons. Moving it back and forth, you can set the required speed of rotation of the culer of the video card as a percentage.

As in the case of Speedfan, in MSI AFTERBurner, you can also automate the control function of rotation of the cooler from the video card. This is the same as leaving the “Auto” button, only the user sets the fan rotation speed when the video card is heated to a certain temperature.

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