How fans do. How to make a fan with your own hands: the best homemade options

Here is a general view of the TsAGI low-noise fan (see Fig. 1). It consists of an electric motor, a housing and an impeller (impeller). The fan can be made without a case. But then it will not give such a powerful air flow. The fan diameter can be up to 400 mm.

If you have an electric motor and you know its maximum number of revolutions, then according to the graph (Fig. 2) it is not difficult for you to determine what maximum diameter you can make the fan.

So you've decided to make a fan. Be aware that the noise of the entire installation is made up of noise from the motor and impeller. So if you want a low-noise fan, then choose a low-noise electric motor.

The fan impeller is made of metal, duralumin or steel sheet. The thickness of the sheet is selected depending on the impeller diameter within 0.5-2 mm. The larger the impeller diameter, the thicker the sheet should be taken.

First, unroll the impeller. The dimensions of this sweep are shown in Figure 3. Here, the numbers do not denote millimeters, but the fraction of the radius of the impeller blade. To obtain dimensions in millimeters, multiply the indicated figures by the selected radius of the fan impeller. Then give the impeller blades the desired profile - knock them out on a blank. Make a blank of hardwood according to the dimensions shown in Figure 4. Here, the dimensions are also given in fractions of the impeller radius.

How do you get such a blank? It is processed in three curved patterns. These templates are made from flat templates (Figure 5). The bending radii of the bent templates and the dimensions of the flat ones can be found in the table. The bent templates are used to check the correctness of the blank production in three sections I-I, II-II, III-III. Align the ends of the template arc with the corresponding vertical marks on the sides of the blank. Make sure that the axial marks on the templates and the blank are in the same plane. Templates are easiest to make from tin. But any metal or plastic sheet is suitable, only the working edge of the templates must be made no thicker than 0.5 mm.

The working surface of the blank should be smooth and smooth. To do this, it must be thoroughly looped and cleaned with sandpaper. Only then can the fan impeller blades be knocked out on it. To prevent the impeller blank from moving when punching, nail it in the center to the blank. And in order to increase the rigidity of the shoulder blades, after punching them out at the root of the shoulder blade along the axis, make small indentations - ridges.

The bushing for landing the impeller on the electric motor axis is turned on a lathe, or made manually, as shown in Figure 6. The impeller and the bushing are connected with rivets or screws.

When the fan impeller is assembled, be sure to statically balance it.
We have already said above that the fan can be made with or without a case. Figure 1 shows one possible case design. Other designs are also possible.

From time to time there is a need for a kind of fan, but small models cost a lot. Do not rush to shell out, because a small fan can be easily made with your own hands. In terms of efficiency, it is not inferior to purchased counterparts, and its creation will require a minimum amount of materials.

Creating a fan from a cooler

The simplest way to make a fan yourself is to use an unnecessary cooler (these are used in a computer as a cooling system for components).

It is not surprising that this method is the simplest, because a cooler is a small fan. It remains only to take a few simple steps to give it its final shape and performance.

The cooler itself is quite functional, but you need to prepare it for a non-standard use:

1. Wires.

If the fan is located near the computer, a regular, unnecessary USB cable will do. You need to cut it off and remove the insulation (the same with the cooler wires):

We are only interested in two wires: red (plus) and black (minus). If there are other colors in the cooler or USB-cable, we can safely cut them off and isolate them, since they are absolutely unnecessary and will only interfere.

1. Compound.

After cleaning, the wires need to be connected together (twist them tightly enough to each other). Don't mix up colors. This threatens with serious complications in the process of creating a fan.

For twisting, a length of 10 mm is sufficient. If necessary, it is allowed to clean most of the wire, this is not scary, but you will have to insulate much more.

1. Security.

Remember that proper insulation is the key to success and will ensure that the computer or outlet will not short-circuit. Bare wires should be sealed with electrical tape (only in the absence of power), and the thicker it is, the better.

There is no particular sense in explaining what threatens the fall of "minus" to "plus". If the red and black wires touch during the transfer of electricity, not only the USB cable / port, but also the computer components may burn out.

In principle, computers are not afraid of such moments if they are equipped with protection against voltage surges. But when a wall outlet is used, it will be much more difficult to fix the wiring in the apartment than creating a small fan.

Therefore, take great care to insulate the exposed parts of the wires. Unnecessary difficulties are rarely needed.

1. Final touches.

Do not forget that a computer cooler is very light, but at the same time quite fast. Even with a voltage of 5 volts, its speed will be quite high. We are considering this voltage for a reason: the cooler will do its job perfectly, and the operation will be as quiet as possible.

Due to the small dimensions of the device, it can fall from vibrations and vibrations. This should not be allowed for the following reasons:

• such a cooler cannot cause fatal cuts even during operation, but there is no guarantee that the device will not jump and fly off, for example, in the face;
• falling not on a flat surface (on a pencil, pen, lighter), its blades can be damaged: fragments broken off at such a speed of rotation can cause irreparable damage;
• other unforeseen circumstances.

Therefore, it is important to fix the cooler (with tape, glue) on some more stable surface: a box, a wooden block, a table.

1. Additional functions.

If desired, a ready-made fan can be updated externally, add a switch (so as not to pull out the cord every time), etc. But attention is also paid to a method that relatively well increases the efficiency of the device.

You just need to cut off the top of the plastic bottle and glue it (with a wide hole) to the cooler frame. Thus, the air flow will be more accurate and directed: the force of air movement will become stronger by about 20%, which is a pretty good indicator.

This completes the creation of the fan, and it is ready for full-fledged work.

Fan made of disks

If the previous option does not suit you, and you want something more complicated, then consider creating a fan yourself from computer disks:

1. Engine.

Since we do not use a cooler, it is necessary to acquire some kind of motor that sets the blades of our future device in motion. In fact, you can use the motor of the already mentioned cooler of the cooling system, but this is too simple.

You should find or buy a motor with a certain moving part (for example, a protruding iron rod). Since we are making a fan from disks, then the presence of such a rod would be the best option. Also, motors from an old VCR or player are perfect, because they spin discs and cassettes - just what you need for a spinning propeller in our fan.

Don't use a motor from a washing machine or even a past fan - they are extremely powerful. Due to the self-assembly of the structure, it will be very flimsy. A strong motor in the very first seconds will carry the fragments of the blades around the room and fly off the base.

If there is a working motor, it must be fastened with wires in the previously mentioned form.

With the engine running, you need to concentrate on the disks, which are the main components of our fan. First, cut one into 8 equal pieces:

In order not to make mistakes during the procedure, you can first mark the disc with a pencil. It is best to use a soldering iron (there will be no sharp edges, this is safer), but regular scissors will work.

After that, the disc should be slightly heated with a lighter to make the material more pliable, and bend the wings in the manner of blades, like with conventional fans:

You can do the same with a regular plastic bottle:

In the center of our propeller, you need to shove a wooden bottle cork. If the size is too large, it can be planed.

1. The rest of the parts.

As a center holding the entire structure, you can use a regular roll of toilet paper roll:

It should be fixed in the center of the second disc, which will act as the foundation for the fan. On top, you can place half of the second hub, as seen in the photo, so that the motor is inside it. On it you need to hang the blades from the disc / bottle.

The fan is ready for operation. Optionally, you can add decorative elements to make the device look more presentable.

And you can see clearly how such a fan is made from a bottle in this video.

Additionally, you should recall the extremely important points when creating a homemade fan:

1. To fasten the parts together, you must use high-quality "superglue".

It is the very one that cannot be peeled off even if desired. The entire structure must be as stable as possible and not be susceptible to vibrations and vibrations. Take responsibility and fill everything you see with glue, except for the blades and internal parts of the engine.

1. Do not hurry.

You run the risk of missing an important detail, and this greatly increases the chances that something will go wrong during the operation of the finished fan. The consequences can be very serious.

1. Don't use bad parts.

If you do not need the motor that is used to create the motor, its performance may be in doubt. Make sure it will last for a while and be effective.

Building an engine from scratch is a highly specialized process and requires a lot of knowledge. Make sure that the motherboards are in order, that all the necessary connections are well soldered, etc. It is better to check once again than to make another fan later.

1. Insulation.

We remind you once again: do not forget about high-quality electrical tape winding of the wires. You should not save it, because short circuits and their repair will force you to sacrifice a lot. Perhaps even in a monetary sense.

The hand-held fan is quite compact, efficient and does its job well. It is not difficult to make it if you take the procedure responsibly and follow the instructions. There are no restrictions on dimensions: if you feel strong, feel free to start assembling a larger fan.

In contact with

Hot. If I may say so, even too much. That is why you can think about how to make a fan. You will say that it can be purchased at the store. But, firstly, their cost increases significantly. Secondly, they are quickly disassembled and it is not always possible to find the necessary ones on store shelves. Therefore, here are some practical tips on how to assemble a fan. After all, it is quite possible to arrange it even at home from available materials. Here are a couple of options.

How to make a fan based on an old cooler. If there is an old one, you can take it from there. Borrow a switch there. Also, in order to make a homemade fan, you need some kind of battery holder. There are many of them, you can take it from some broken toy or something else in the same spirit. Of course, the batteries themselves will be needed in the amount of several pieces. It remains to connect all these components together, and a simple fan will be ready. If you don't want to bother with the holder, you can use a regular USB port to supply power. You can make a stand from anything. It all depends specifically on your own imagination and what you have at hand.

You can, for example, make a stand out of ordinary stiff wire attached to something. It is not so important which materials will be used, but how stable the entire structure will be.

Another option, how to make a fan, might be useful for enthusiasts. Computer disks are an excellent tool for making. What else is needed? A motor from a simple toy, a cork left over from champagne, some handy switch and a few batteries. We take the disc, and then we make as many cuts as the blades are needed. It is necessary to leave about a centimeter up to the inner edge. Then turn each of the blades slightly at an angle. It bends much better if the disc is heated, for example, over gas. Then you will need to insert a champagne cork into its center. If you make a small puncture in its center, for example, with an awl, then you can easily attach the entire structure to a pin. You will need to make a leg - absolutely any object in the shape of a cylinder, which is able to accommodate batteries and wires, can act in its role.

It will also be necessary to arrange the base for the entire unit - it can also be anything, the main thing is that it is stable and can hold the structure on itself. It only remains to add a few additional tips - when cutting out the blades, you need to make sure that each of them is about 45 degrees - about 8 pieces will eventually come out. The plug inserted in the center of the disc will need to be fixed with glue. In any case, the process should not cause you any difficulties.

If you have thought about how to make a fan, then now you probably understand that it is very simple. Each of the proposed models is extremely easy to manufacture, and it will not take you a lot of time to create it. You do not need any special things, the above is quite enough. These fans are very convenient and compact. You can put it on your desktop. Or, if there is such a desire, take it with you to the garage or to the country house, where these devices will be the means of cooling. It is difficult to argue with the fact that they have a tangible dignity - after all, these, by and large, very useful things have been collected from various rubbish.

As you can see, it is quite possible to make a fan yourself, from scrap materials, without bothering with trips to the store and looking for a unit that suits you at an affordable price. Everything is much simpler.

The question is trivial. First, we recommend that you determine the location of the homemade fan. Two types of motors dominate in technology: collector (historically the first), asynchronous (invented by Nikola Tesla). The former make a lot of noise, switching sections causes a spark, the brushes rub, causing noise. Squirrel cage induction motor is quieter, generates less noise. You will find the start-up relay in the refrigerator. By adding a couple of phrases of humorous phrases, we will return the seriousness of the site. How to make a fan with your own hands, do not scare your family. Let's try to answer.

Aspects of designing a homemade fan

The fan device is so simple, it makes no sense to tell, paint the insides. What to consider when designing? Remember the growl of the cyclone vacuum cleaner, the volume is over 70dB. There is a collector motor inside. More often devoid of the ability to regulate speed. Decide whether a similar sound pressure level is acceptable at the installation site of a home-made fan? Having chosen the latter, we will concentrate on asynchronous motors, simple models do not require a starting winding. The power is low, the secondary EMF is induced by the stator field.

The drum of an asynchronous motor with a squirrel-cage rotor is cut with copper conductors along a generatrix, kind of an angle to the axis. The direction of the slope determines the direction of rotation of the motor rotor. The copper conductors are not insulated from the drum material, the conductivity of the Olympic metal is superior to the surrounding material (silumin), the potential difference between adjacent conductors is small. The current flows through the copper. There is no contact between the stator and the rotor, the spark has nowhere to come from (the wire is covered with varnish insulation).

The noise of an induction motor is determined by two factors:

1. Coaxiality of stator and rotor.
2. Bearing quality.

Correctly carrying out the adjustment, maintenance of the asynchronous motor, you can achieve almost complete noiselessness. We recommend that you consider whether the sound pressure level is important. It concerns a duct fan - it is allowed to use a collector motor, the requirements will be set by the location of the section.

The duct fan is placed inside the duct section, mounted, breaking the duct. The section is removed for service.

Noise is losing its dominant role. The sound wave, passing through the air duct, is attenuated. Part of the spectrum that has inconsistent dimensions relative to the width / length of the section of the path is especially fast. Read the tutorials on acoustic lines for more details. The brushed motor can be used in basement, garage, deprived of people. The neighbors of the cooperative will hear, rather they are too lazy to pay attention.

What is good about the collector motor, what we are fighting for the right to use. Three disadvantages of asynchronous:

At the initial moment, the asynchronous motor does not develop a large torque, a number of special design measures are taken. It doesn't matter for the fan. Most household models are equipped with asynchronous motors. In production, the number of phases is increased to three.

Search fan motor

One YouTube video suggested using a 3 volt DC motor from a hardware store. Crowns the USB cable, works by rotating the blade of the laser disc. A useful invention? If you are tired of an extra port, it will help you to survive the heat. It's easier to take a processor cooler, power it from the system unit. A yellow wire goes to 12 volts (red to 5). The black pair is the earth. Assemble from your old computer. Citizens of the Russian Federation are simply too lazy to invent, we throw curious equipment into a landfill.

Asynchronous fan motors operate without a starting capacitor ... The peculiarity of fan motors is: they go directly with the winding. A couple of tips to help you get your hands on the engine:

Make a fan impeller

The question of what to make a fan is not resolved, the authors keep silent about the impeller. First things first, the refrigerator! The compressor is blown by the impeller. You will get the motor, remove it. It will come in handy. As for the washing machine, run the drum on the aircraft propeller. A plastic tank is good for making a body. Warm the folds with a construction hairdryer.

Examine the blender, supply an unnecessary impeller-shaped laser disk. You can make a fan yourself using the materials at hand. It doesn't require much power, and it makes no sense to overdo it when honing the details. We believe readers know how to make a fan with their own hands.

Perpetual fan from a cpu cooler

We decided to please the readers by telling us how to make a fan. The review is far from the first, I had to dig, looking for something worthwhile. The idea of ​​creating an eternal fan that spins forever looks gorgeous. User mail.ru posted a design that looks attractive. Let's take a closer look, along the way, thinking about how to make a fan that runs forever.

You know, of course, the system units work quietly (modern models). The slightest noise means: the cooler has lost its axis, or it's time to lubricate the aging fan. They work for hours, days add up to weeks, the system unit will last for years. Made possible thanks to sophisticated technology. Think, noise depends on the magnitude of the friction force. Mechanical energy becomes thermal, acoustic due to the presence of roughness. CPU coolers rotate easily, it's worth blowing up.

The author of the video - we apologize for the lack of a name, we justify: the video is in English - offers to assemble an eternal fan from an accessory. The precision of the fit of the parts is great, the blade turns easily. Costs are reduced to a minimum. The author of the video posted by the deirones channel noticed that the processor fan is powered by direct current. Climbing inside, I found four coils equally spaced around the circumference, with their axes directed to the center of the device.

There are no switches inside, which means a paradoxical fact: the field of the coils is constant.

If the induction motor of a typical fan is powered by an alternating voltage of 220 volts, which creates a rotating magnetic field, in our case the picture is constant. One could say: inside the rotor drives the commutator, which creates the desired distribution. Not true, is confirmed by the further train of thought of the author, the result of experience. A Western innovator decides to replace the coil with a permanent magnet. Indeed, there is no alternating field - why electric current?

Demonstratively, the author cuts off the power wire, places neodymium (hard disk) magnets with the perimeter of the frame. Each is on the extension of the coil axis. The work was finished, the blades began to revolve briskly. We believe that the principle is simply used, which is hushed up by orthodox literature. Trade secret of the patentee.

The initial movement of the blade is obtained by random air fluctuations. It resembles a magnetron, the buildup of oscillations is caused by the natural chaotic movement of elementary particles. The question arose what sets the direction of rotation. The design is absolutely symmetrical. We decided to figure it out, we express our observations:

Agree, it is more convenient than to muddy USB ports, to constantly waste batteries. A perpetual fan works from an arbitrary position, devoid of wires. We believe that the strength of the magnets plays a decisive role. The simple rule stops working: more is better. The golden mean is slipping. When the blades spin from the random air flow, overcoming the field of neodymium pieces. Weak magnets are probably powerless to maintain steady rotation. The field strength should be exactly the same as that generated by the coils under the action of +5 or +12 volts.

The right way to create a perpetual fan

We discussed how to make a fan, measure the direction and strength of the magnetic field of the coils. They use special devices. Magnetometer, teslameter, formed by a magnetic induction transducer, a measuring module. When the fields interact, the resulting picture is obtained, called cohesion. The converter generates EMF. The size determines the measured strength of the magnetic field. Like two fingers! It costs 10,000 rubles.

The magnets will be located at a considerable distance from the axis. The coils are much closer. You need to know how the picture changes with distance. According to Coulomb's law, the force falls in inverse proportion to the square of the distance, which is true for single charges of arbitrary sign. Separate magnetic poles in nature have not yet been found (it is not possible to create), the distance cube is introduced into the law. Let's say the distance to the coil from the axis is 1 cm, the perimeter on the diagonal is 10. This means that neodymium should be 10 x 10 x 10 = 1000 times stronger than a small coil.

Nobody obliges to place neodymium magnets on the diagonals of the fan perimeter. The poles are criss-cross. They regulate the strength of the impact over a wide range. Placing neodymium magnets in the center of the sides of the fan frame significantly increases the field strength. Let's make the calculation. Let's say the hypotenuse of a triangle with a side of 10 cm is the diagonal. The distance to the center of the square will be 10 / √2 = 7 cm. You see, the ratio falls from 1000, reaching 7 x 7 x 7 = 343. Vesomo, desperate to find strong neodymium magnets to create an eternal fan.

Force is measurable! A compass is good (there are custom designs, assembled by hand, for example, http://polyus.clan.su/index/indikatory_magnitnogo_polja_svoimi_rukami/0-52). One coil should be connected to the power supply. Then find the position, the raised arrow will deviate by about 45 degrees (if you don't like it, take any other azimuth). Then start experimenting with neodymium. Place the piece at different distances, making sure that the deflection of the arrow coincides with that obtained when using the processor fan coil. Surely the distance is not equal to the diagonal, half of the side, you will have to break and cut neodymium.

Sawing through one edge along the length, carefully break the parts against the nail, obtaining the required field strength to create an eternal fan. We assume that the induction is distributed in proportion to the volume. Today we told you clearly how to make a fan with your own hands!

Power supply

Anyone who wants to make a fan with his own hands sees 3 problems: get the engine, power, make a propeller. The details must fit together. Three problems are solved, you start making a fan with your own hands. Today there is an abundance of switching power supplies at home. Think about it, it started in the 90s. Game consoles, mobile phones, other equipment. The technique breaks down, the switching power supplies remain. The voltage is sometimes non-standard, most of the motors work, powered by any voltage. It's just that the speed will change according to the voltage. Broken household appliances are lying around at home - immediately make a fan yourself.

Homemade fan power supplies

People are constantly trying to make a special fan with their own hands. One issue is more often outside the scope of discussion: power supply. The fan design itself is so obvious, it makes no sense to dwell in more detail. So, of course, there are an incredible amount of batteries today. Will they be able to work for a long time. The answer is no. In extreme cases, take the "crown", in Soviet times was considered a reliable source of energy. The power supply is bad, the power will gradually decrease, the speed will decrease, and the person will be annoyed. Stability without additional effort is important. There is no small 12 volt battery - get ready: let's start looking for how to make a power source for a homemade fan.

The first thing that comes to mind is to use the computer. It is known that miniature devices are powered by a USB port. Gadgets are being charged. The USB port is a source of inexhaustible energy. The voltage is low, a low voltage DC motor will be needed. We suppose you can find it at home, buy it at a hardware store. How much is the port power: 2–3 W according to the old standards. Another thing is to find a host device with an updated version of the interface (2014 was recognized as a rarity). The developers promised to deliver 50 watts (even more, it's hard to believe). True, there will be more wires, the nominal voltages will increase. Remember, according to tradition, power is supplied to the red (+), black (-) wires. White, green - signal.

It is clear that it is difficult to expect high power - even if the port supports it, the motor will not pull. It is recommended to look at a higher voltage. The motor must be supplied with a higher voltage. For example, a CPU cooler is recommended. The supply voltage is less than the prescribed 12 volts, the rotation speed will simply decrease. Beware of exceeding - the motor may burn out.

We are looking for energy, the issue is easier to solve than for 3 volts:

12 volt power supply for a homemade fan with your own hands

We propose not to assemble a switching power supply, to make a regular one with your own hands. Recall that the former are distinguished by small transformers. Consequently, the power supply unit will be relatively large. It will consist of the following parts:

• A step-down transformer. We do not name the number of turns in advance, the voltage is unknown, by rectifying it with diodes, we get 12 volts. Of course, you can experiment, like a YouTube video about homemade radios, capturing the reader and looking for a ready-made solution.
• The full-wave bridge, adding three diodes to one, increases the efficiency. Radio components do not differ in high cost.
• The backbone of the power supply is ready for a home-made fan to serve for a long time, let's straighten the network ripple. After the bridge, turn on the low-pass filter, redraw the circuit from the Internet.

The output is a constant voltage with an amplitude of 12 volts. Try not to mix up the terminals. Where the "plus", where the "minus" comes out, you can understand by studying the diagram. Below is a drawing of the bridge, see, read the explanations. In electronics, the direction of the current is indicated opposite to the true one. The charges flow, according to popular belief, in the direction from plus to minus (towards the electrons). Reading the diagram, you will see: at the diode, transistor, the emitter marked with an arrow looks wrong. In the direction of movement of positive charges. Each has marks, on the diagram it is indicated by a huge arrow-triangle. Therefore, we always recognize the "plus", guided by the graphic designations given in the drawing.

The figure shows: plus will be on the right, transmitted according to the arrow of the diode to the lower output terminal. The minus will go up. With an alternating voltage (roughly speaking), plus, minus will alternate from left to right, the name of the rectifier will become clear - full-wave. Works on the positive part of the voltage and negative. Take power, low-frequency diodes. Solid size, power dissipation is relatively high. You can calculate using a simple formula taken from a physics course. The resistance of the open p-n-junction (leafing through the directory) is multiplied by the current consumed by the motor, we take the margin at least 2 times. The motor case contains an inscription indicating the power, it can be divided by a voltage of 12 volts, simply multiplied by 2 - 3, take a diode with an equivalent power dissipation (see the reference book).

Now we will calculate the transformer ... We went here http://radiolodka.ru/programmy/radiolyubitelskie/kalkulyatory-radiolyubitelya/, chose the Trans50 program, we will master it. Note that among the software there is one that allows you to calculate the filter parameters. Do you regret that you are going to make a fan with your own hands? They offer to choose one of 5 windings. Steel is involved everywhere. You can do without, the losses will be great. Steel forms a magnetic circuit, energy goes to the secondary winding. Better to find an old rusty transformer. The times are bad, in the hungry 90s landfills are littered with sheets of scraped windings. There were no problems with winding transformers.

It's time to understand what voltage is required for the correct operation of the circuit. A term borrowed from electronics, AC voltage, will help. The voltage across the active resistance creates a thermal effect equal to the constant voltage of the effective amplitude. To obtain the required voltage on the secondary winding, you need to divide 12 volts by 0.707 (unit divided by the square root of 2). The authors got 17 volts. An engineering calculation is guilty of an error of 30%, we take a small margin (part of the amplitude up to 1 volt will be lost on the diodes).

As for the secondary winding current (calculation required), type something like "cooler power" in the search engine. Let's do it together with the readers. Smart articles write: the current consumption of the cooler is indicated on the case. The required parameter will be substituted into the calculator. The author took the voltage of the secondary winding 19 volts. The voltage drop across the pn junctions of powerful silicon diodes is 0.5 - 0.7 volts. Therefore, an adequate supply is needed. Smart heads searched, made a conclusion, the processor cooler does not consume more than 5 W, therefore, the current is 5 divided by 12 = 0.417 A. Substitute the numbers to the downloaded calculator, for the ribbon core we get the transformer design parameters:

1. Cross-sections of the magnetic core for winding 25 x 32 mm.
2. Window in the magnetic circuit 25 x 40 mm.
3. The magnetic core is finished with a frame for winding a wire with a thickness of 1 mm and a section of 27 x 34 mm.
4. The wire is wound along the larger side of the window, 1 mm from the edges remains a margin, a total of 38 mm.

The primary winding is formed by 1032 turns with a diameter of 0.43 mm. The approximate length of the wire is 142 meters, the total resistance is 17.15 ohms. The secondary winding consists of 105 turns of a copper conductor with varnish insulation with a diameter of 0.6 mm (length 16.5 meters, resistance 1 Ohm). Now readers understand: the question of what to make a fan is started to be solved with a core ...

How effective are the proposed technical solutions? Vans are known to Ancient Egypt. Michael Jackson's clip recommending “Remember the time” is evidenced. The plot was hardly made without the advice of archaeologists and historians. We would like to report that in Mexico most ladies use fans. The Spaniards know how to deal with the heat, the country lies on the equator. Think ...

Summer has come, which means heat, heat and an eternal lack of coolness. But this problem is fixable, and pretty easy. You only need a few details and a little free time to make your life easier with your own hands, fill it with the light coolness that you will certainly get by making a USB fan at home. Of course, you can go and buy a fan in a store, but how nice it will be to sit next to the same computer, and a slight breeze from the USB fan you created will blow on you. And a thing created with your own hands always pleases not only the eye, but also develops self-love.

We offer you to watch a video of homemade products - usb fan:

USB fan tools:
- Regular CD (not necessarily new);
- The tube of silicone glue is empty;
- Wooden block;
- Mini disc;
- USB cable;
- Motor;
- Holder;
- Adapter;
- Silicone glue gun.

Three holes must be made in the tube, one in the lid and two on the sides. The holes are easy to make using a regular nail that needs to be heated first.

A slot or recess must also be made in a wooden block. This can be done easily using emery.

The mini disc easily converts into a propeller. To do this, it must be drawn into uniform blades, then a clerical knife should be heated and cut along the lines drawn in advance. After that, we heat the base of each blade with a lighter and bend each blade a little with the help of our hands to make a propeller.

We take the motor, holder and adapter from a non-working CD-ROM drive.

Now let's start assembling the USB fan.

We heat the glue gun. Lubricate the holder along the axis with silicone glue from a glue gun. The propeller must be firmly seated on this glue. Press down on all sides. Then, on the other side of the holder, drip a drop of glue and glue the adapter. We are waiting for the glue to dry well. This usually takes only a couple of minutes.

Now we take a tube of silicone glue, remove the lid and grease the inside with silicone glue. And we insert the motor inside so that the part that we will connect sticks out of the hole that we originally made.

Then we push the USB cable into the side opening of the tube from under the glue and connect the ends of the wires to the motor.

It is necessary to pour silicone glue into the recess in the wooden bar, and there we put the wire from the USB cable tightly, and glue the tube with the motor inside to the base of the bar. And on the other side of the bar, glue the CD with silicone glue.

Now the propeller must be placed from the side of the adapter glued to it, put on the sharp edge of the motor, which sticks out of the hole in the tube from under the glue.

And finally, our USB fan can be plugged in for that long-awaited coolness.