How fans are made. 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 speed, then according to the graph (Fig. 2), it is easy for you to determine what maximum diameter you can make a fan.

So, you have decided to make a fan. Keep in mind that the noise of the entire installation is made up of the noise of the motor and the impeller. So if you want a quiet fan, then choose a quiet electric motor.

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

First, unfold the impeller. The dimensions of this scan are shown in Figure 3. Here, the numbers indicate not millimeters, but fractions 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 blades of the impeller the desired profile - knock them out on a blank. Make a blank from hardwood according to the dimensions shown in Figure 4. Here, the dimensions are also given in fractions of the radius of the impeller.

How to get such a blank? It is processed in three curved patterns. These templates are made from flat templates (Figure 5). You will find the bending radii of bent templates and the dimensions of flat templates in the table. Bent templates check the correctness of the manufacture of the blank 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 risks on the templates and the blank are located in the same plane. Templates are easiest to make from tin. But any metal or plastic sheet will do, 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 cycled and cleaned with sandpaper. Only after that it is possible to knock out the blades of the fan impeller on it. To prevent the impeller blank from moving during the drift, nail it in the center to the blank. And to increase the rigidity of the blades, after knocking them out at the root of the blade along the axis, make small indentations - ridges.

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

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

From time to time there is a need for a kind of fan, but small models cost relatively much. Do not rush to fork 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 easiest way to make a fan yourself is to use an unnecessary cooler (these are used in a computer as a cooling system for components).

Not surprisingly, this method is the simplest, because the cooler is just 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 way of using it:

1. Wires.

If the fan is located near the computer, an ordinary unnecessary USB cable will do. It needs to be cut and the insulation removed (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, feel free to cut them off and isolate them, because they are absolutely unnecessary and will only interfere.

1. Compound.

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

For twisting, 10 mm length is enough. If necessary, it is allowed to clean most of the wire, this is not scary, but much more will have to be insulated.

1. Safety.

Remember that proper insulation is the key to success and a guarantee that the computer or outlet will not short out. 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 point in explaining what threatens the fall of "minus" to "plus". If the red and black wires come into contact during the transmission of electricity, not only the USB wire / 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, fixing the wiring in the apartment will be much more difficult than creating a small fan.

Therefore, seriously take care of the insulation of bare parts of the wires. Extra complexity is rarely needed.

1. Final touches.

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

Due to the small dimensions of the device, vibration and vibration may cause it to fall. This should not be allowed for the following reasons:

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

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

1. Additional functions.

If desired, the finished 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.

Simply cut off the top of a plastic bottle and glue it (with a wide hole) to the cooler frame. Thus, the air flow will be more precise and directed: the force of air movement will be 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.

Disk fan

If the previous option does not suit you, and you want something more complex, 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 part of it moving (for example, a protruding iron rod). Since we are making a fan from disks, then having such a rod would be the best option. Motors from an old VCR or player are also great, because they spin discs and cassettes - just what we 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 strong. Due to self-assembly of the structure, it will be very flimsy. A strong motor in the first few seconds will spread the fragments of the blades around the room and fly off the base.

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

With a running engine on hand, we 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 a mistake during the procedure, you can pre-mark the disk with a pencil. It is best to use a soldering iron (there will be no sharp edges, it is safer), but regular scissors will work.

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

You can do the same with a regular plastic bottle:

In the center of our propeller you need to put a wooden bottle cap. If the size is too big - it can be planed.

1. The rest of the parts.

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

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

The fan is ready to work. 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 to each other, you must use high-quality "superglue".

It is the one that cannot be peeled off even if desired. The entire structure must be as stable as possible and not succumb to vibrations and vibrations. Responsibly and cover 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 engine, its performance may be in doubt. Make sure it lasts for a while and will be effective.

Building an engine from scratch is a highly specialized process and requires good knowledge. Make sure that the motherboards are in order, all the necessary connections are soldered well, 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 the high-quality winding of wires with electrical tape. You should not save it, because short circuits and their repair will force you to sacrifice big expenses. Perhaps even in terms of money.

A 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 either: 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 dismantled and it is not always possible to find the necessary ones on store shelves. Therefore, a few practical tips on how to assemble a fan. After all, it is quite possible to arrange even at home from available materials. Here are a couple of options.

How to make a fan based on an old cooler. If you have an old one, you can take it from there. Borrow a switch there as well. Also, in order to make a homemade fan, you will 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 vein. Of course, you will need the batteries themselves 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 out of anything. It all depends specifically on your own imagination and what you have at hand.

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

Another option, how to make a fan, may be useful for enthusiasts. An excellent tool for manufacturing will be computer disks. What else will be required? A motor from a simple toy, a cork left over from champagne, some kind of handy switch and a few batteries. We take the disk, and then we make as many cuts as we need the blades. It is necessary to leave about a centimeter to the inner edge. Then turn each of the blades slightly at an angle. It bends much better if the disk 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, you can easily attach the entire structure to some kind of pin. You will need to make a leg - absolutely any object in the form of a cylinder, which is able to accommodate batteries and wires, can act in its role.

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

If you have been thinking about how to make a fan, now you probably understand that it is very simple. Each of the proposed models is extremely easy to manufacture, and you will not need much time to create it. You don't need anything special, the above is enough. These fans are very handy 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 dacha, where these devices will be cooling means. It is difficult to argue with the fact that they have a tangible advantage - after all, these, by and large, very useful things are collected from various rubbish.

As you can see, it is quite possible to make a fan on your own, from improvised materials, without bothering with going to the store and looking for a unit that suits you at an affordable price. Everything is much easier.

The question is trivial. First, we recommend determining the installation location of a homemade fan. Two types of engines dominate in technology: collector (historically the first), asynchronous (invented by Nikola Tesla). The first ones are very noisy, switching sections causes a spark, the brushes rub, causing noise. An asynchronous motor with a squirrel-cage rotor is quieter, generates less interference. You can find the starter 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, not to scare your family. Let's try to answer.

Aspects of designing a homemade fan

The device of the fan is so simple, it makes no sense to tell, paint the insides. What to consider when designing? Remember the growl of a cyclone vacuum cleaner, the volume is above 70 dB. Inside the commutator motor. More often deprived of the possibility of regulation of revolutions. Decide whether a similar sound pressure level is acceptable at the installation site of a home-made fan? Having chosen the second, 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 wires along the generatrix, at an angle to the axis. The direction of the slope determines the direction of rotation of the motor rotor. Copper conductors are not isolated from the material of the drum, the conductivity of the Olympic metal exceeds the surrounding material (silumin), the potential difference between adjacent conductors is small. Current flows through copper. There is no contact between the stator and rotor, there is nowhere for the spark to come from (the wire is covered with varnish insulation).

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

1. Alignment of the stator and rotor.
2. Bearing quality.

By correctly setting up, maintaining an asynchronous motor, you can achieve almost complete noiselessness. We recommend that you consider whether the sound pressure level is important. The case 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 path. For maintenance, the section is removed.

Noise is losing its dominance. The sound wave is attenuated as it passes through the duct. Particularly fast is the part of the spectrum that has inconsistent dimensions relative to the width/length of the tract section. Read more textbooks on acoustic lines. The commutator motor can be used in the basement, garage, devoid of people. The neighbors of the cooperative will hear, rather be too lazy to pay attention.

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

At the initial moment, the induction motor does not develop a large torque, a number of special design measures are taken. The fan doesn't matter. 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. Tops the USB cord, works by rotating the blade of the laser disc. Useful invention? If you are tired of an extra port, the heat will help you survive. 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. Collect from an 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 straight with the winding. A couple of tips to help get the engine:

Make a fan impeller

The question of what to make a fan from has not been resolved, the authors keep silent about the impeller. First things first, the fridge! The compressor is blown by an impeller. You will get the motor, remove it. Come in handy. As for the washing machine, put the drum on an aircraft propeller. A plastic tank is suitable to make a case. Heat the bending points with a building hair dryer.

Inspect the blender, supply an unnecessary laser disc, which has received the shape of an impeller. You can make a fan yourself using improvised materials. It does not require much power, there is no point in being too zealous, honing the details. We believe readers know how to make a fan with their own hands.

Eternal fan from the CPU cooler

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

You know, of course, system units work quietly (modern models). The slightest noise means: the cooler's axis has gone astray, or it's time to lubricate the aged fan. They work for hours, days add up to weeks, the system unit will last for years. Made possible by smart technology. Think about it, the 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.

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

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

If the asynchronous motor of a typical fan is powered by 220 volts alternating voltage, which creates a rotating magnetic field, in our case the picture is constant. One could say: inside the rotor sets in motion a commutator that creates the desired distribution. Not true, is confirmed by the further course 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?

Defiantly, the author cuts off the power wire, places neodymium (hard disk) magnets around the perimeter of the frame. Each on the continuation of the axis of the coil. The work is finished, the blades cheerfully began to rotate. We believe that a principle that is hushed up in orthodox literature is simply used. Trade secret of the patent owner.

The initial movement of the blade is obtained by random fluctuations in the air. It resembles a magnetron, the buildup of oscillations is caused by the natural chaotic movement of elementary particles. The question arose as to what determines 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 stir up USB ports, constantly wasting batteries. The perpetual fan works from an arbitrary position, it is 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 a random flow of air, overcoming a field of neodymium pieces. Weak magnets are surely powerless to keep a steady rotation. The field strength must be exactly as produced by the coils when subjected to a voltage of +5 or +12 volts.

Correctly create an eternal fan

We discussed how to make a fan, we will measure the direction, the strength of the magnetic field of the coils. Use special devices. Magnetometer, teslameter, formed by magnetic induction converter, measuring module. When the fields interact, the resulting picture is obtained, which is called cohesion. The converter generates an 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 inversely proportional to the square of the distance, which is true for single charges of an arbitrary sign. Separate magnetic poles in nature have not yet been found (it is not possible to create), the cube of distance is introduced into the law. Let's say the distance to the coil from the axis is 1 cm, the diagonal perimeter is 10. This means that neodymium should be 10 x 10 x 10 = 1000 times stronger than a small coil.

No one obliges to place neodymium magnets on the diagonals of the fan perimeter. The poles lie crosswise. Regulate the strength of the impact over a wide range. By placing neodymium magnets in the center of the sides of the fan frame, we significantly increase the field strength. Let's do the calculation. Let's say the hypotenuse of a triangle with a side of 10 cm is a diagonal. The distance to the center of the square will be 10 / √2 = 7 cm. You see, the ratio drops from 1000, reaching 7 x 7 x 7 = 343. It is important for those who are desperate to find strong neodymium magnets to create an eternal fan.

Let's measure strength! A compass is suitable (there are custom designs assembled by one's own hands, 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 matches the one obtained when using the processor fan coil. Surely the distance is not equal to the diagonal, half of the side, neodymium will have to be broken, cut.

Sawing one edge along the length, we carefully break the parts on the nail, getting the desired field strength to create an eternal fan. We assume that the induction is distributed in proportion to the volume. Today they told intelligibly how to make a fan with your own hands!

Source of power

Those who want to make a fan with their own hands see 3 problems: get the engine, power, make a propeller. The parts must fit together. Three problems are solved, you start making a fan with your own hands. Today at home, an abundance of switching power supplies. Think it started in the 90s. Game consoles, mobile phones, other equipment. The equipment breaks down, switching power supplies remain. The voltage is sometimes non-standard, most motors work on any voltage. The RPM will just fluctuate with the voltage. Broken household appliances were 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 left out of the discussion: the power supply. The device of the fan itself is so obvious that it makes no sense to dwell on it in more detail. So, it’s clear that there are an unthinkable amount of batteries today. Can they work for a long time? The answer is no. As a last resort, take the "crown", in Soviet times they were 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. A small 12 volt battery is missing - get ready: let's start looking for how to make a homemade fan power source.

The first thing that comes to mind is to screw up the computer. It is known that miniature devices are powered by a USB port. Gadgets are recharged. The USB port is a source of inexhaustible energy. The voltage is low, you need a low voltage DC motor. We believe you can find at home, buy in a hardware store. How much will the power of the port: according to the old standards 2-3 watts. 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 give out 50 watts (even more, it's hard to believe). True, there will be more wires, nominal voltages will increase. We remind, 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 the voltage more. The motor must be supplied with a higher voltage. For example, it is recommended to use a CPU cooler. 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 do-it-yourself fan

We suggest not to assemble a switching power supply, to make a regular one with your own hands. Recall that the first ones are distinguished by small transformers. Therefore, the power supply will be relatively large in size. It will consist of the following parts:

• A step-down transformer. We will not name the number of turns in advance, the voltage is unknown, having straightened it with diodes, we get 12 volts. Of course, you can experiment, like a YouTube video about homemade radios, capturing the reader, we will look for a ready-made solution.
• The full-wave bridge, adding three to one diode, we increase the efficiency. Radio components are not very expensive.
• The backbone of the power supply is ready for a home-made fan to serve for a long time, we will 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" is, where the "minus" comes out can be understood by examining the diagram. Below is a drawing of the bridge, see, read the explanations. In radio electronics, the direction of the current is indicated opposite to the true one. Charges flow, according to beliefs, in the direction from plus to minus (towards electrons). Reading the circuit, you will see: for a diode, a transistor, the emitter marked with an arrow looks wrong. In the direction of positive charges. Each has marks, on the diagram it is indicated by a huge triangle arrow. Therefore, we always find out, “plus”, guided by the graphic symbols given in the drawing.

The figure shows: the plus will be on the right, it is 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 the negative. Diodes take power, low-frequency. Solid size, power dissipation is relatively large. You can calculate using a simple formula taken from a physics course. We multiply the resistance of an open p-n junction (leafing through the reference book) by the current consumed by the motor, taking the margin at least 2 times. The body of the motor contains an inscription indicating the power, can be divided by a voltage of 12 volts, simply multiply by 2 - 3, take a diode with equivalent dissipation power (see reference book).

Now let's calculate the transformer ... We went here http://radiolodka.ru/programmy/radiolyubitelskie/kalkulyatory-radiolyubitelya/, we 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 were going to make a fan with your own hands? They offer to choose one of 5 windings. Steel is everywhere. You can do without, the losses will be great. Steel forms a magnetic circuit, energy goes to the secondary winding. It is better to find an old rusty transformer. The time is bad, in the hungry 90s, landfills are littered with plates of windings handed over for scrap. There were no problems with winding transformers.

It's time to understand how much voltage is required for the correct operation of the circuit. A term borrowed from electronics, effective AC voltage, will help. Voltage, on the active resistance, creating a thermal effect equal to the constant voltage of the effective amplitude. To obtain the required voltage value on the secondary winding, you need to divide 12 volts by 0.707 (one divided by the square root of 2). The authors received 17 volts. Engineering calculation sins with an error of 30%, let's take a small margin (part of the amplitude up to 1 volt will be lost on the diodes).

As for the secondary winding current (required for calculation), type something like “cooler power” in the search engine. Let's do it with the readers. Clever articles write: the current consumption of the cooler is indicated on the case. There will be a necessary parameter, we will substitute in the calculator. The voltage of the secondary winding, the author took 19 volts. The voltage drop across the p-n junctions of powerful silicon diodes is 0.5 - 0.7 volts. Therefore, an appropriate reserve is needed. Smart heads searched, concluded that the processor cooler does not consume more than 5 W, therefore, the current is 5 divided by 12 \u003d 0.417 A. We substitute the numbers for the downloaded calculator, for the tape core we get the design parameters of the transformer:

1. Cross-sections of the magnetic circuit for winding 25 x 32 mm.
2. The window in the magnetic core is 25 x 40 mm.
3. The magnetic circuit is finished with a frame for winding wire 1 mm thick and with a cross section of 27 x 34 mm.
4. The wire is wound along the larger side of the window, leaving a margin of 1 mm from the edges, 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 starting to be solved with a core ...

How effective are the proposed technical solutions? Fans are known to Ancient Egypt. The video of Michael Jackson, recommending “remember the time” (Remember the time) testifies. The plot was hardly prepared without the advice of archaeologists and historians. We want 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 some free time to make your life easier with your own hands, fill it with light coolness, which you will certainly get by making a USB fan at home. Of course, you can go and buy a fan in the store, but how nice it will be to sit near the same computer, and a light breeze will blow on you from the USB fan you created. And a thing created by one's own hands always pleases not only the eye, but also develops selfishness.

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

Tools for usb fan:
- Regular CD (not necessarily new);
- A tube of silicone glue is empty;
- Wooden block;
- Mini disk;
- 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. Holes are easy to make using a regular nail, which must first be heated.

It is also necessary to make a slot or recess in a wooden block. This can be done easily with sandpaper.

The mini disk easily turns into a propeller. To do this, it must be drawn into uniform blades, then heated with a clerical knife and cut along pre-drawn lines. And after that, we heat the base of each blade with a lighter and with the help of our hands we bend each blade a little to make a propeller.

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

Now let's start assembling the USB fan.

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

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

Then we put the USB cable into the side hole of the glue tube 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 put the wire from the USB cable tightly there, 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 on silicone glue.

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

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