How to make a fan with your own hands: the best homemade models. USB fan from a computer cooler How fans are made

August 6, 2018

Sitting at the computer in the summer, many people begin to suffocate from the heat, it's good if there is air conditioning, but it's not always convenient to turn it on. In this article, we will tell you how to do USB fan with your own hands, from a motor, a cooler and a small engine. We will show the manufacturing process and step-by-step instructions, highlight the two most simple and effective ways.

Making a fan with a computer cooler

To make a fan at home and not strain at all, we found this method on the open spaces of the network. The entire manufacturing process will take no more than 20 minutes, you can use old coolers or just buy a new one in the store, the price for them is now a penny.

First, we begin to prepare the cooler, it has two wires: red and black. We remove the insulation by 10 mm from each wire, there is even a device for stripping the insulation. The size of the cooler does not play a special role, of course, it is better if it is large, the wind flow will be stronger in the end.

We begin the preparation of the USB wire, for this we cut off one half at the place of the main cut and remove all the insulation. We will get four wires: two black and two red, we also clean them. If the cooler has other green or white color cut them off, they just get in the way. Learn how to make your own thermoelectric generator.

In the end result, you need to connect the wires to each other, there can be several ways, the main thing to remember is color coding. Do not forget to isolate everything among themselves, the more isolation, the better. For convenience, the finished cooler can be installed in a regular shoe box, so it will be more stable.

This is how the guys in the video suggest us to make a fan out of a cooler. The method is actually simple, we do not promise strong airflow, but working at a computer will become much more pleasant.

How to make a USB fan with your own hands using a motor

So, to make a fan from a disk motor and usb, we need more time, but this type of fan will look better. Everyone can make such a device, the main thing is to show a little desire and patience.

First of all we have to make the blades for our fan, we recommend using a regular CD, it looks great and is quite easy to make. Also read interesting article where we make laser level.

1. We make 8 identical marks on the disk, and cut everything along them.
   
2. Then we warm up the disk and bend all the blades in the right direction. To warm up the disk, it is enough to use an ordinary lighter, bend the blades carefully, do something wrong - you have to buy a new disk.
   
3. Now let's move on to the base of the fan itself, for this it is best to take cardboard and bend it into three parts, or a cardboard base, for example, food wrap is wrapped around it.
   
4. A special fastening is glued to the disk.
5. We make the base of the case more stable, you can attach a regular disk.
6. We hide all the wires, we display one (for connecting to the network).
   
7. We fix the motor in a paper pipe and immediately attach it to the base.
   
8. We attach the blade to the engine.
   
9. Now we connect the wires from the motor to the USB cable, as described above.
10. This is the result obtained in the end, if desired, the cardboard base can be painted over or somehow decorated.
    

Here the guys from the video show a really cool way. In a similar way, you can make a fan out of paper, but remember, the paper must be thick, it is optimal to use cardboard in general.

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, several practical advice about how to assemble the 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. More to do 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. Excellent tool for the manufacture will serve as 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.

Let's make a simple fan.
You will need:
1. 3V motor
2. Section for 2 batteries of 1.5 V. I took it in the CHIP and DIP store.
3. Switch.
4. Wire 15 cm.
5. Bobbins from fishing line or ropes, a jar from Polysorb, a jar of gouache.
6. Impeller from the cooler of the power supply.
7. Soldering iron.
8. Thermal gun.
9. Self-tapping screws 11 pcs. 2 cm long.

1. Take bobbins from threads with a diameter of 5 mm and a height of 4.5 cm - from a fishing line or cord.
We mark a hole for the switch with a marker and cut a hole slightly smaller than the size of the switch with nail scissors and insert the switch into the reel:

2. Now we form the fan frame: let's make 3 reels together and mark four holes for bolts or self-tapping screws with a marker on the bottom of the upper reels. We burn holes through the edges of two bobbins:

3. Using a lighter, we melt and clean the red wire from the section with batteries and attach it to one switch terminal, and to the other - the second red wire. To isolate the terminals from contact with each other, fill them with hot glue:

4. We fasten the red wire to the plus + of the engine, and the black one, respectively, to the minus - of the engine:

5. The top can be made from a box of gouache: on the lid with a soldering iron we form a hole for wires and 3 holes for self-tapping screws. And on the box itself we cut a hole with nail scissors a little less than the diameter of the engine and place it inside. As in the case of a switch, you can pour hot glue on the outside for reliability.

6. We put the impeller from the cooler on the cork, fill the voids with plasticine or fill it with paraffin, make a hole in the cork with a self-tapping screw or an awl, fill it with epoxy glue or hot melt adhesive, and put it on the engine. If this epoxy resin- leave to dry for a day and only then turn it on!

Throughout the long winter, we look forward to pleasant summer days, and with the onset of a hot season, for some reason, we begin to dream of coolness. How deliciously the light breeze created by a small homemade fan will help restore strength and relieve fatigue. Plus, making it is incredibly fun, right?

We invite you to familiarize yourself with step by step instructions on assembling the simplest effective devices from literally junk raw materials. The article presented to your attention details how to make a fan with your own hands and what a home master will need for this.

At your disposal is a detailed description of the manufacture of options, the effect of which has been tested in practice. You can make such devices with your own hands, without having any experience at all. For a complete understanding of the information attached step by step photos and video instructions.

The simplest fan can be made from CDs. It can be used, for example, for local impact on a user who spends a long time at the computer.

Let's prepare the source materials for the work:

• CD discs - 2 pcs.;
• low power motor;
• cork from a wine bottle;
• wire with USB plug;
• a tube or rectangle made of thick cardboard;
• soldering iron;
• candle or lighter, hot glue;
• pencil, ruler, checkered paper.

For our purposes, you can use a motor from an old toy, for example, from a typewriter. As a cardboard tube, a sleeve from a roll of toilet paper slightly ennobled with decorative finishing paper is suitable.

The main advantage of this model is that almost any do-it-yourself lover can find all the materials that are necessary for its manufacture.

The process of assembling a mini fan is quite simple.

Let's take one of the CD disks and use a marker to divide its surface into eight identical sections. The easiest way to do this is to use a piece of squared paper.

Let's draw a cross on it from a horizontal and vertical line. Each of the four resulting right angles is divided in half. Using cells, this is quite easy to do.

Using a very simple method using a checkered leaflet, we can achieve a perfect layout of the disk into eight equal sectors.

We impose a disk on our drawing so that the intersecting lines are in the very center of its hole. Alternately applying the ruler to the lines diverging from the center, we make markings on the disk. So the sections will be the same.

To divide the disk into blades, you should draw a soldering iron along the marking lines from the transparent part to the edge.

Scissors can also be used for cutting, but there is a danger that the workpiece will crack during operation. If there is no soldering iron, you need to use a knife preheated on the stove. When working with a soldering iron, welded plastic is formed along the edges of the cut, which is easily removed with a knife.

Cutting the disk with a soldering iron is the most effective method, at which the workpiece will not crack or deform, and the remnants of the deposited plastic can be easily removed with a knife

We heat the surface of the disk over the flame of a burning candle so that the blades can be slightly expanded. If there is no candle, a lighter or blow dryer will do.

The central part of the disk should be heated, and all the blades should be turned in the same direction. Placed in the opening of the disk wine cork. To better fix it, you need to pre-treat the edges of the hole with hot glue.

The USB cable must be connected to the motor. If we do not guess with the direction of rotation of the propeller, it will be possible to swap the occasions, that is, change the polarity.

The motor must be glued to the cardboard tube, and the tube itself to the second CD, which will act as the base of the stand.

When the plug is installed in the hole, the support of the second CD and cardboard tube, as well as the connecting device are already assembled, it is very important to correctly fit the propeller on the motor shaft

Now the propeller needs to be “landed” on the stem of the future fan. We will try to make sure that it is installed strictly in the center. You can fix it in this position with hot glue.

After completion of all work, the fan is ready for use.

Although the construction of this device will not take you much time, but the result of the work done will undoubtedly please you.

How to do the same, but a little more complex structure, including a regulator in the circuit, look at the video posted at the end of this article.

Do you find this homemade instructions complicated? Then you may be interested in information about and the rules for choosing them in order to purchase a ready-made appliance offered by manufacturers of household appliances.

Plastic bottle fan

What our craftsmen do from plastic bottles! It is time to say that the fan from them also turns out to be very good. It may not ventilate your entire room, but it will definitely help someone who is forced to work at a computer.

We offer two options for creating such a fan model.

Option #1 - hard plastic model

To do the job, we need:

• plastic bottle with a capacity of 1.5 liters;
• motor from an old toy;
• small switch;
• Duracell battery;
• marker;
• scissors;
• candle;
• hammer and nail;
• Styrofoam;
• hot glue gun.

So let's take an ordinary plastic bottle 1.5 liters with stopper. At the level of the label line, cut off its upper part. It is she who we will need to make the propeller. We divide the surface of the plastic blank into six parts.

We try to mark it so that we get equal sectors: the quality of the future device depends on this.

We cut the workpiece according to the markup almost to the neck. We bend the blades of the future propeller and cut off every second of them. We are left with a blank with three blades equidistant from each other. The edges of each of the blades must be rounded. We do it carefully.

To remove those parts of the blades that are closer to the neck of the workpiece, it is better to use a utility knife; do not forget to round the edges of the blades

Now we will need a small candle. We light it up. We heat each blade on it at the base in order to turn it in the direction we need. All blades must be turned in the same direction. We remove the cover from the workpiece and in its very center we punch a hole with a nail and a hammer.

We put the cork on the rod of a small motor. Such motors can remain from old children's toys. As a rule, getting them is not difficult. We fix the cork with glue.

Now you need to make a base on which the motor will hold. For this purpose, we take, for example, a piece of foam. We fix a rectangle on it, which can also be cut out of the foam packaging.

On the upper surface of this rectangle, our motor will be fixed, to which the propeller is attached. To do this, in the foam, you need to make a recess corresponding to the parameters of the motor.

Hot glue is used to fix the elements of the product. In its absence, other adhesives can be used. It is important that the mount itself is as reliable as possible.

We have made parts designed to enhance the airflow. They will provide accelerated cooling of the space around.

Now you need to make the basis for fixing them:

Image Gallery

After preparing the device, designed to enhance the performance of the fan, we proceed to the assembly and commissioning:

Image Gallery

Stylish product without blades

We are used to the fact that the main part of the fan is the propeller. This part of the structure rotates, creating the necessary air flow.

But there are also. They have firmly become fashionable, first of all, due to their safety for younger family members and for pets. In addition, these products look stylish: they are able to fit into any interior and decorate it.

The finished bladeless fan is not at all like the device that we are used to seeing, however, it works great.

Like most other things that are in the service of a person, a bladeless fan can also be made by hand.

The principle of its operation is simple: a small turbine is located at the base of the device, which allows you to create air flows passing through the side holes.

For work we need:

• computer cooler;
• block and power connector;
• small switch;
• hot glue gun;
• cardboard or thick paper;
• scissors, pencil, ruler, compass and caliper.

In principle, we need a caliper solely in order not to be mistaken in the size of the product. If it is not available, then it is quite possible to get by with an ordinary ruler, tape measure or centimeter tape.

Let's get to work.

To begin with, we will make the body - the base of the product. To do this, cut out four rectangular pieces of cardboard. To determine the parameters of the base, we measure the width of the cooler. The resulting size will match the width of the rectangles.

For convenience, we will operate with specific dimensions. The width of our cooler is 120 mm. And this means that the width of the rectangle is also 120 mm.

A small switch and a power connector will be built into the body of our product. In order for them to keep tight enough in the future, you need to remove the sizes from them.

The holes in the housing must correspond to the values ​​obtained. You need to make holes before the moment when the rectangles become part of the case: it is always easier to cut them in flat objects.

We need a twelve-volt power supply and a corresponding cooler that consumes only 0.25A. Taking into account the fact that we have a 2A unit, we can assume that we are quite well prepared for the further operation of the future device.

Now we take sheets of cardboard, from which we have to cut out the elements of the main part of the fan. First, draw two circles. The radius of each of them is 15 cm. Cut out both circles.

In one of them, let's call it A, we will draw an inner circle with a radius of 11 cm. In the second, which we will call B, the radius of the inner circle will be 12 cm. Carefully cut out the inner circles. Got rings A and B.

The resulting rings will be attached to the body of the product. In order for them to better adjoin the surface of the case, we will attach one of the rectangular blanks to each of the rings and cut off a segment, the flat side of which corresponds to the width of the rectangle.

In order to be able to reliably glue the rings to the base on which they will be installed, it is necessary to ensure the maximum contact area: for this, the sector is cut off at the bottom of the product

Main part bladeless fan It has cylindrical shape. To make it, we need strips of cardboard with the following parameters: the first is 12x74cm, the second is 12x82cm, the third is 15x86cm. During the assembly process, it will become clear what to do with each of these three strips.

Before assembling the case, we cut out a notch at the bottom of each of the rectangles. So we not only make legs for the future fan, but also create channels for incoming air.

The recesses in the lower part of the base can also be made rectangular, but it is better to add an arc to the original rectangle by drawing it with a CD.

We will assemble the body using hot glue. The cooler should be located approximately in the central part of the case, surrounded by four rectangles that form the walls of the structure. Lubricate the cooler around the perimeter with glue and surround it with walls.

Do not forget that the notches in the walls that we just cut out should be at the bottom of the case.

The wires from the cooler can be removed to the corner of the structure, fixing them in this position with glue.

At this stage, it is best to mount and connect. Since we are using a switch, we need to separate one of the wires and form a circuit.

The wires should be connected to the power connector (red - plus, black - minus). If we make a mistake in polarity, we just need to swap the wires. Using hot glue, we fix the connector and the switch in the places intended for them.

We connect the power and check if the turbine is working. If everything is in order, we continue to assemble our bladeless model.

We take ring A, which will be located in front of the device, and the first strip (12x74cm). We close the strip in a circle and paste it into the inner circumference of the ring A. It turned out to be a kind of cylinder hat without a top, but with fields. The same must be done with ring B and the second strip (12x82cm).

Here is a semblance of a hat turned out from ring A and the first strip, which we pasted along the inner circumference of the ring

We glue the first "cylinder" to the front side of the case in the place where we cut off the segment. The second "cylinder" is also glued to the back side of the case with a cut surface. In this case, the smaller "cylinder" is inside the larger one.

Structural stability can be given with the help of five strength partitions fixed between the rings using the same glue. They need to be cut out of cardboard. The length of the partitions should be slightly less than 12cm.

Now side surface the main structure should be closed with the remaining third strip of cardboard (15x86cm).

This photo clearly shows the internal design of the fan, which will be hidden from us by the last (third) strip

In principle, the fan is ready. It remains to give it an external gloss. To do this, remove excess glue and cover with paint or paste over decorative paper its outer surfaces.

You may also find it useful information about, set out in our other article.

To make sure you understand and do everything correctly, watch the video on creating a bladeless fan on your own, which we posted at the end of this article.

If you are fond of assembling interesting and useful appliances, then you may be interested in information on making an air conditioner at home, discussed in our other article.

Green plastic fan, to which the video is dedicated, not only works well, but also looks great.

It will become a real desktop decoration of your workplace:

A feature of the bladeless fan, which you can easily assemble by following the instructions and video, is that the airflow appears as if from nowhere. The model attracts with its originality.

Spend some time on it decoration, and you will see how flawlessly it will fit into your interior:

We have presented you the best of homemade fan models. And they are the best because they do not require special mechanisms for their construction, complex tools, expensive materials and special skills. Anyone can create them House master, even a beginner.

We hope that the success that you will definitely achieve by making a fan will awaken your taste for independent creativity.

Do you use a homemade fan made from improvised materials? Or did you use one of the instructions given in our article when assembling the device? Perhaps you have improved the equipment available in the house? Tell us about your experience - leave your comments.

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 cyclone vacuum cleaner, the volume is above 70 dB. Inside 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 induction 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. Especially 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 asynchronous motor does not develop a large torque, a number of special design measures are taken. The fan doesn't matter. Majority household models equipped with asynchronous motors. In production, the number of phases is increased to three.

Search fan motor

One YouTube video suggested using the engine direct current 3 volts 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. Goes to 12 volts yellow wire(red at 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. Concerning washing machine, put the drum on the aircraft propeller. plastic tank fit to make a body. 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. Western innovator decides to replace the coil 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, strength magnetic field 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. Position the piece different deletions, achieving the coincidence of the deflection of the arrow with 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!

Power supply

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. Gaming consoles, Cell 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. The broken house was lying around Appliances- 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. IN 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's clear, high power it is difficult to expect - even if the port supports, 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 homemade fan with your own hands

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, let's 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, the effective voltage will help alternating current. Voltage, on the active resistance creating a thermal effect equal to constant voltage operating 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 ancient egypt. The clip 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...