Tag Archives: fan

Have you ever seen a fan resistant to dust and water?


New series of Sunon fans with IP68 protection brings reliability even to conditions, where a usual fan doesn´t withstand too long…

Still more noise and vibrations and in extreme case even a total malfunction – this is a typical “end” of the fan after a long-time operation in a dusty or corrosive environment. In a usual dry and relatively clean environment, this scenario is not that dramatic and high-quality fans hold on to work for many years without problems. However, it can be also said, that common industrial environment is quite far from an ideal = clean one.

So, which fan to use?

The first good advice might be to use a quality fan, for example from companies Sunon or EBM-Papst. Company Sunon this time declares, that they shifted a level of lifetime and durability a step higher… They “wrapped” all the motor into a „high-tech“ coating and incorporated a mechanism for automatic dust removal from a motor part.

And the result?

The fan works reliably even after a 60 minute ingress into water and into 1m depth. That´s only a small example demonstrating features of the new series with IP68 protection. New series carry GExxxx or GFxxxx marking and they´re available in three sizes – 80x80x25mm, 80x80x38mm and 90x90x25mm. All types are equipped by two ball bearings.
On stock we have types – GF80251B1-AE9 ( 80×25 12VDC 3,96W 101,9m3/h) and GE80252B1-AE9 ( 80×25 24VDC 4,8W 101,9m3/h). Upon request we´re able to supply you also other types.

Have you ever seen a fan resistant to dust and water? – [Link]

Modern EC fans are able to save up to 50% of energy


Minimum noise, easy speed control and a high power, those are another reasons why to decide for GreenTech EC fans from EBM-Papst.

A term „EC fan“ (electronic commutation) is generally used to mark energy-saving AC fans. In fact, these are DC (brushless) fans with AC/DC module and other electronics. EC fans reach up to 90% efficiency and they consume 50% less energy than traditional AC fans.
At the same time, a typical „50Hz“ motor noise is eliminated at EC fans and practically the only noise source is aerodynamic noise depending on overall fan design.

A good example of a modern fan is for example the type G1G140-AW31-42 i.e. radial (centrifugal) fan with 140mm diameter. Efficient motor with a „Soft start“ function enables to control fan speed through a DC input (0-10V) or PWM. To check a proper function, the fan also features „Tach“ output (2 pulses / revolution) as well as locked motor protection.
Thanks to the built-in electronics, at cyclic use it´s recommended to switch-off the motor through a control signal, not by switching-off main power supply.

G1G140-AW31-42 is suitable for a continuous operation (S1) and can be mounted in any position. It´s used for example for building ventilation.
Detailed information will provide you the G1G140-AW31-42 datasheet.

Modern EC fans are able to save up to 50% of energy – [Link]

Sleep easy with this desk fan speed reducer


by Michael Whybray:

Most desk fans I have come across have three speeds: Full Speed, Almost Full Speed, and Off – useless if you want just a gentle air movement, and far too noisy if you are trying to get to sleep (in your bedroom of course, not at your work desk!). The squirrel cage induction motors they use have switches to two or more windings – and possibly a capacitor – to reduce the drive current. But unless the drive frequency is also reduced, the torque and speed stability are poor, so minimal speed reduction is usually available on these fans. Using a triac to provide phase control of the voltage works poorly for the same reason, with the speed very sensitive to the triac firing phase angle and fan load, and has a tendency to stall.

Sleep easy with this desk fan speed reducer – [Link]

Temperature Controlled PC FAN


This project is a temperature controller for a PC FAN. It regulates the speed of the FAN attached to it according to measured temperature. Temperature is sensed using a simple NTC thermistor.

In most PCs the fan runs constantly, which may not be necessary. A simple circuit can regulate the fan speed according to temperature. This not only saves energy, it also reduces fan noise. Only three components are needed to allow the fan speed to be controlled according to the actual temperature: one adjustable voltage regulator (LM317T) and two resistors that form a voltage divider. One of the resistors is a NTC thermistor (temperature-sensitive resistor), while the other is a normal resistor.

Temperature Controlled PC FAN – [Link]

Choose a fan with a low noise and low power consumption


Silence at last – or what to do, if a silent operation of a fan matters to us?

Despite features of fans being still more improved, it´s still the fact, that they are usually the biggest noise source in devices. If a given device is intended say for a production hall, where an ambient noise is much higher, we probably don´t have to worry about it. But at devices intended for common rooms, offices, households etc., it´s naturally important to maintain the noise of a device as low as possible. If dimensions of a device allow it, it´s usually better and more silent solution to use a fan with a bigger diameter and a lower rotation speed. However, what to do when the size and a design of a fun suit us, but a power, rotation speed and consequently a noise are still uselessly high?

A partial solution is to decrease a supply voltage. Computer enthusiasts know very well, that a noise of a given fan depends (besides its aerodynamic construction) on its rotation speed. Solid producers like Sunon, specify range of operating voltages and a rotation speed at a given voltage (for example 12V). Also in a datasheet can be usually found even a start voltage, at which a given fan will reliably start to rotate. By a change of a supply voltage, we can change a fan speed, but it´s not possible to go below certain speed (at a given fan type). It´s common, that for example a 12V fan still works at 4V (when decreasing from 12 to 4V) but it´s already not able to start at such a low voltage.

Probably the best solution is to use a slower fan (with a lower rotation speed). Today almost every series of fans is available in 2-3 power levels, what reflects in a noise but also in different power consumption. This can be illustrated on 2 types of the same construction – MEC0251V1-A99 (MEC0251V1-0000-A99) and MEC0251V3-A99 (MEC0251V3-0000-A99). As for a mechanical construction, they are the same. The only difference is only in a rotation speed – 3100 vs. 2200 turns per minute. This is then reflected in a noise 44,5 vs. 34 dB and in a power consumption 5,4 vs. 1,9 Watt. The noise difference 10,5 dB is really big ( 6 dB difference is subjectively perceived as a double volume) and in many cases it´s surely not negligible even a power consumption difference of approx. -65%. Should you still be satisfied with a lower air flow, it´s naturally possible even at these slower types further decrease rotation speed by decreasing a supply voltage. Naturally, there are even more silent fans on the market, but types from company Sunon offer a very good compromise among noise, power and a price.

Choose a fan with a low noise and low power consumption – [Link]

Fans able to operate continuously for 30 years


Over 60 years of experiences of German company EBM-PAPST in the fans development reflects in an uncompromising quality of products.

It may sound like a phrase, but to rely on a quality is almost always worth – mainly because of overall savings. Long lifetime and energy efficiency will at the end of the day reflect into lower operation expenses. Quality materials sophisticated construction, precise bearings and results from long-term tests say in favor of EBM-Papst fans. EBM-PAPST has in its testing laboratories 1500 operating fans and there can be even found fans continuously operating from 80´s (!). EBM-Papst is quite stringent regarding a declared lifetime and in comparison to other producers it declares „less optimistic

MAX31740 – Ultra-Simple Fan-Speed Controller


The MAX31740 is a sophisticated, yet easy-to-use fan-speed controller. It monitors the temperature of an external NTC thermistor and generates a PWM signal that can be used to control the speed of a 2-, 3-, or 4-wire fan. The fan control characteristics are set using external resistors, thereby eliminating the need for an external microcontroller. Controllable characteristics include the starting temperature for fan control, PWM frequency, fan speed at low temperatures, and slope of the temperature-duty-cycle transfer function.

MAX31740 – Ultra-Simple Fan-Speed Controller – [Link]

AVR microcontroller based PWM fan controller


Zak Kemble build an AVR based PWM fan controller. He writes:

So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers and MOSFETs instead of 555 ICs and transistors. I made 2 versions, one with switches for speeding up and down and the other with a potentiometer like the previous controllers. I used ATtiny25 controllers running at 31.25KHz (8MHz internal RC / 256 prescaler) with a 3.3V supply, the MOSFETs I used are STP36NF06L with 0.045Rds and 2.5Vgs max, perfect for 3.3V, the MOSFETs only generate ~180mW of heat at 2A ((0.045Rds * (2A * 2)) = 0.18W) so no heatsink needed, you can barely feel them getting warm.

AVR microcontroller based PWM fan controller – [Link]