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 a 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 using 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 strip them. If there are other green or green wires on the cooler white we cut them off, they just get in the way. Learn how to make a thermoelectric generator with your own hands.

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. Don’t forget to isolate everything from each other, 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 we make a fan from a cooler. The method is actually simple, we don’t promise strong airflow, but working at the computer will be 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 a usb, we will need more time, but this type of fan will look better. Anyone can make such a device, the main thing is to show a little desire and patience.

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

1. We make 8 identical marks on the disk and cut everything along them.
   
2. Then we heat up the disk and bend all the blades in the desired direction. To warm up the disk, just use a regular lighter, you bend the blades carefully, if you do something wrong, you will 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, wrapped in cling film.
   
4. We glue a special mount 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 and bring one out (to connect to the network).
   
7. We attach the motor to the paper tube and immediately attach it to the base.
   
8. We attach the blade to the engine.
   
9. Now we connect the wires from the motor with a USB cable, as described above.
10. This is the final result; if desired, the cardboard base can be painted over or decorated in some way.
    

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.

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 sold out and it is not always possible to find what you need on store shelves. Therefore, several practical advice about 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 you have an old one, you can take it from there. You can also borrow a switch there. More to do homemade fan, you will need some kind of battery holder. There are many of these, you can take it from some broken toy or something else in the same spirit. Of course, you will also need several batteries themselves. All that remains is 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. The stand can be made from anything. It all depends specifically on your own imagination and what you have at hand.

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

Another option on how to make a fan may be useful for enthusiasts. An excellent tool Computer disks will be used for production. What else is needed? A motor from a simple toy, a cork left over from champagne, some kind of handy switch and several batteries. We take the disk, and then make as many cuts as we need for the blades. It is necessary to leave about a centimeter to the inner edge. Then turn each blade 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 cylinder-shaped object that can accommodate batteries and wires can play its role.

You will also need to design a base for the entire unit - it can also be anything, the main thing is that it is stable and can support the structure. All that remains is to add a few additional tips - when cutting out the blades you need to make sure that each of them is approximately 45 degrees - you will end up with about 8 pieces. The plug inserted into the center of the disk will need to be secured with glue. In any case, the process should not cause you any difficulties.

If you've been thinking about how to make a fan, you now probably understand that it's 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 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 country house, where these devices will serve as cooling means. It’s hard to argue with the fact that they have tangible dignity - 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 yourself, from scrap materials, without bothering with going to the store and looking for a unit that suits you at an affordable price. Everything is much simpler.

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

1. Take spools of thread with a diameter of 5 mm and a height of 4.5 cm - from 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 the 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 it 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 hot weather, for some reason we begin to dream of coolness. How delightfully a 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 waste raw materials. The article presented to your attention describes in detail how to make a fan with your own hands and what a home craftsman will need for this.

At your disposal is a detailed description of the manufacture of options, the effects of which have been tested in practice. You can make such devices yourself 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;
• cable 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 toy car. A toilet paper roll slightly decorated with decorative finishing paper can be used as a cardboard tube.

The main advantage of this model is that almost any do-it-yourselfer will have all the materials needed for its manufacture.

The process of assembling a mini fan is quite simple.

Let's take one of the CDs and use a marker to divide its surface into eight equal sections. The easiest way to do this is to use a sheet of checkered paper.

Draw a cross on it from a horizontal and vertical line. We divide each of the four resulting right angles in half. Using cells, this is not difficult to do.

Using a very simple method using a checkered piece of paper, we can achieve the ideal layout of the disk into eight equal sectors

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

To divide the disk into blades, follow the marking lines with a soldering iron from the transparent part to the edge.

You can also use scissors for cutting, but there is a danger that the workpiece will crack during the process. If you don’t have a soldering iron, you need to use a knife preheated on the stove. When working with a soldering iron, deposited plastic is formed along the edges of the cut, which can be easily removed with a knife.

Cutting a disk with a soldering iron is the most effective method, in 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 you don't have a candle, a lighter or a soldering iron will do.

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

The USB cable must be connected to the motor. If we don’t guess the direction of rotation of the propeller, we can swap the reins, that is, change the polarity.

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

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

Now the propeller needs to be “planted” on the rod of the future fan. We will try to make sure that it is installed strictly in the center. You can secure it in this position using hot glue.

After all work is completed, the fan is ready for use.

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

How to make something similar, but a little more complex design Having included a regulator in the circuit, look at the video posted at the end of this article.

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

Fan based on a plastic bottle

What our craftsmen don’t do from plastic bottles! The time has come to say that they also make a very good fan. It may not ventilate your entire room, but it will definitely help those who have to work at a computer.

We offer two options for creating such a fan model.

Option #1 – hard plastic model

To complete the work we will need:

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

So, let's take the ordinary one plastic bottle 1.5 liters with plug. At the level of the label line, cut off its upper part. This is exactly what we need to make the propeller. We divide the surface of the plastic blank into six parts.

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

We cut the workpiece along the markings 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 blade must be rounded. We do this 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. Let's light it up. We heat each blade at the base on it to turn it in the direction we need. All blades must be turned in the same direction. Remove the lid from the workpiece and punch a hole in the very center using a nail and hammer.

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

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

Our motor, to which the propeller is attached, will be fixed on the upper surface of this rectangle. To do this, you need to make a recess in the foam that corresponds to the parameters of the motor.

Hot melt adhesive is used to secure the elements of the product. If it is unavailable, other adhesives can be used. It is important that the fastening itself is as reliable as possible.

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

Now you need to make the basis for fixing them:

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

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Stylish product without blades

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

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

The finished bladeless fan is completely different from the device we are used to seeing, however, it works great

Like most other things that serve a person, a bladeless fan can also be made with your own hands.

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

For work we will need:

• computer cooler;
• power supply unit and 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 make a mistake in the dimensions of the product. If it is not available, then you can get by with a regular ruler, tape measure or measuring tape.

Let's get to work.

First, let's 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, measure the width of the cooler. The resulting size will match the width of the rectangles.

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

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

The holes in the housing must correspond to the obtained values. You need to make holes until the rectangles become part of the body: cutting them out in flat objects is always easier.

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, let's 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. We received rings A and B.

The resulting rings will be attached to the body of the product. In order for them to better adhere to the surface of the body, we will apply 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 reliably glue the rings to the base on which they will be installed, it is necessary to ensure the maximum contact area: for this purpose, a 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 - 12x74cm, the second - 12x82cm, the third -15x86cm. During the assembly process it will become clear what to do with each of these three strips.

Before assembling the body, cut a notch in the bottom of each rectangle. This way 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 be made in a rectangular shape, but it is better to add an arc to the original rectangle, drawing it using a CD disk

We will assemble the body using hot melt 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.

Don't forget that the notches in the walls that we just cut should be at the bottom of the case.

The wires from the cooler can be tucked into a corner of the structure, securing 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 split one of the wires and form a circuit.

The wires should be connected to the power connector (red - positive, black - negative). If we get the polarity wrong, we just need to swap the wires. Using hot glue, we secure the connector and 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 assembling our bladeless model.

We take ring A, which will be located in the front of the device, and the first strip (12x74cm). We close the strip into a circle and glue it into the inner circumference of ring A. The result is something like a cylinder hat without a top, but with a brim. The same must be done with ring B and the second strip (12x82cm).

This kind of hat came out of ring A and the first strip that we glued along the inner circumference of the ring

We glue the first “cylinder” to the front side of the body in the place where we cut off the segment. We also glue the second “cylinder” to the back side of the body with a cut surface. In this case, the smaller “cylinder” ends up inside the larger one.

The stability of the structure can be imparted using 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 lateral surface the main structure should be covered with the remaining third strip of cardboard (15x86cm).

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

In principle, the fan is ready. All that remains is 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 the information provided in our other article useful.

So that you can see how correctly you understood and did everything, watch the video on how to create a bladeless fan yourself, which we placed at the end of this article.

If you are interested in assembling interesting and useful devices, then you may be interested in information about 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 for your workplace:

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

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

We have presented you with the best homemade fan models. And they are the best because their construction does not require special mechanisms, complex instruments, expensive materials and special skills. Absolutely 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 scrap materials? Or did you use one of the instructions given in our article when assembling the device? Perhaps you have improved the equipment you have in your home? Tell us about your experience - leave your comments.

The question is trivial. First, we recommend determining where to install your homemade fan. Two types of engines dominate in technology: commutator (historically the first), asynchronous (invented by Nikola Tesla). The first ones make a lot of noise, switching sections causes a spark, the brushes rub, causing noise. An asynchronous motor with a squirrel-cage rotor is quieter and generates less interference. You will find the start-up protection 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 without scaring your family. Let's try to answer.

Aspects of designing a homemade fan

The design of the fan is so simple that there is no point in telling or describing the insides. What to consider when designing? Remember the growl cyclone vacuum cleaner, volume above 70 dB. Inside brushed motor. Often deprived of the ability to regulate speed. Decide, is a similar sound pressure level acceptable at the installation site of a homemade 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 conductors along the generatrix, at an angle to the axis. The direction of the slope determines the direction of rotation of the engine rotor. Copper conductors are not insulated from the drum material, 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, the spark has nowhere to come from (the wire is covered with varnish insulation).

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

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

By properly setting up and servicing an asynchronous motor, you can achieve almost complete noiselessness. We recommend considering whether sound pressure level is important. The case concerns a duct fan - it is allowed to use a commutator motor, the requirements will be determined by the location of the section.

The duct fan is placed inside the air duct section and mounted, breaking the duct. The section is removed for maintenance.

Noise loses its dominant role. The sound wave, passing through the air duct, attenuates. Particularly fast is the part of the spectrum that has inconsistent dimensions relative to the width/length of the path section. Read more textbooks on acoustic lines. The brushed motor can be used in a basement, garage, or unoccupied areas. The neighbors of the cooperative will hear, but will rather be too lazy to pay attention.

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

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

Finding a motor for a fan

One YouTube video suggested using an engine direct current 3 volt from a hardware store. Tops a USB cord, works by rotating the laser disc blade. Useful invention? If you're tired of the extra port, this will help you survive the heat. It’s easier to take a processor cooler and power it from the system unit. It runs at 12 volts yellow wire(red for 5). The black pair is earth. You can assemble it from an old computer. Citizens of the Russian Federation are simply too lazy to invent, so we throw interesting equipment into a landfill.

Asynchronous fan motors operate without a starting capacitor... The peculiarity of fan motors is that they come directly with a winding. A couple of tips to help you get an engine:

Make a fan impeller

The question of what to make a fan from has not been resolved; the authors kept silent about the impeller. First things first, the refrigerator! The compressor is blown by an impeller. When you get the motor out, remove it. It will come in handy. Concerning washing machine, launch the drum onto an aircraft propeller. Plastic tank It's good to make a body. Heat the bend areas with a hair dryer.

Inspect the blender and equip it with an unnecessary laser disk shaped like an impeller. You can make a fan yourself using available materials. You don't need a lot of power, and there's no point in trying too hard to fine-tune the details. We believe that readers know how to make a fan with their own hands.

Eternal CPU cooler fan

We decided to please our readers by telling you how to make a fan. This is not the first review, I had to dig around to find something worthwhile. The idea of ​​​​creating an eternal fan that spins forever looks great. User mail.ru posted a design that looks attractive. Let's take a closer look, while thinking about 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 is out of alignment, or it's time to lubricate the old fan. They work for hours, days add up to weeks, the system unit will last for years. It became possible thanks to well-thought-out technology. Think about it, noise depends on the magnitude of the friction force. Mechanical energy becomes thermal and acoustic due to the presence of roughness. CPU coolers rotate easily, just blow on them.

The author of the video - we apologize for the lack of a name, we justify: the video is in English - suggests assembling an eternal fan from an accessory. The fitting accuracy of the parts is high, the blade rotates 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. I climbed inside and 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 induction 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. You could say: inside the rotor sets in motion a commutator that creates the desired distribution. This is not true, and is confirmed by the author’s further train of thought and the result of experience. Western innovator decides to replace the coil permanent magnet. Indeed, there is no alternating field - why electric current?

The author demonstratively cuts off the power cord and places the neodymium (hard drive) magnets around the perimeter of the frame. Each is on the continuation of the coil axis. The work is completed, the blades begin to rotate vigorously. We believe that a principle is simply used that is hushed up in orthodox literature. Trade secret of the patent holder.

The initial movement of the blade is obtained by random air fluctuations. Reminiscent of a magnetron, the vibrations are 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 look into it and express our observations:

Agree, it’s more convenient than messing up USB ports and constantly wasting batteries. The eternal fan operates from an arbitrary position and is devoid of wires. We believe that the strength of the magnets plays a decisive role. The simple rule no longer works: more is better. A golden mean is emerging. When the blades spin from a random air flow, overcoming a field of neodymium pieces. Weak magnets are probably powerless to maintain stable rotation. The field strength must be exactly that created by the coils under the influence of +5 or +12 volts.

Correctly create an eternal fan

We discussed how to make a fan, measure the direction, force magnetic field coils They use special devices. A magnetometer, Teslameter, is formed by a magnetic induction converter, a measuring module. When fields interact, the resulting pattern is called coupling. The converter generates EMF. The size is determined by the measured strength of the magnetic field. Like two fingers! 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 decreases in inverse proportion to the square of the distance, which is true for single charges of arbitrary sign. Separate magnetic poles have not yet been found in nature (it is not possible to create them); the cube of distance is included in 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.

Nobody obliges to place neodymium magnets around the fan perimeter on diagonals. The poles lie crosswise. Adjust the force of influence 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 equal to 10 / √2 = 7 cm. You see, the ratio drops from 1000, reaching 7 x 7 x 7 = 343. We are desperate to find strong neodymium magnets to create an eternal fan.

Let's measure the strength! A compass is suitable (there are custom designs that you can assemble yourself, 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 arrow brought up will deviate by about 45 degrees (if you don’t like it, take any other azimuth). Then start experimenting with neodymium. Place the piece on different removals, ensuring that the arrow deflection coincides with that obtained when using the processor fan coil. Surely the distance is not equal to the diagonal, half the side, the neodymium will have to be broken and cut.

By sawing one edge along the length, we carefully break the parts on a nail, obtaining the required field strength to create an eternal fan. We assume that the induction is distributed proportionally to the volume. Today we explained clearly how to make a fan with your own hands!

Power supply

Anyone who wants to make a fan with their own hands sees 3 problems: getting a motor, power supply, and making a propeller. The parts must fit together. Three problems solved, you can start making a fan with your own hands. Today there are an abundance of switching power supplies at home. Think about it, it started in the 90s. Gaming consoles, Cell phones, other equipment. Equipment breaks down, switching power supplies remain. The voltage is sometimes non-standard; most motors operate on any voltage. The revolutions will simply change according to the voltage. There's a broken one lying around at home Appliances- Make a fan yourself immediately.

Homemade fan power supplies

People are constantly trying to make a special fan with their own hands. One issue is often beyond the scope of discussion: the power source. The design of the fan itself is so obvious that there is no point in going into more detail. So, it’s clear that there are an unimaginable number of batteries today. Will they be able to work for a long time? The answer is no. IN as a last resort take the “krona”, in Soviet times it was considered a reliable source of energy. The power supply is bad, the power will gradually drop, the speed will decrease, and it will irritate people. 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 screw up the computer. It is known that miniature devices are powered by a USB port. Gadgets are recharging. The USB port is a source of inexhaustible energy. The voltage is low, you will need a low voltage DC motor. We believe you can find it at home or buy it at a hardware store. How much port power will be: according to old standards, 2–3 W. Another thing is to find a host device with an updated version of the interface (2014 was considered a rarity). The developers promised to deliver 50 W (it’s hard to believe even more). True, there will be more wires, the rated voltages will increase. We remind you that according to tradition, power is supplied to the red (+), black (-) wires. White, green - signal.

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

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

12 volt power supply for a homemade do-it-yourself fan

We suggest that you do not assemble a switching power supply, but make a regular one with your own hands. Let us remember that the former are distinguished by small-sized transformers. Therefore, the power supply will be relatively large in size. Will consist of the following parts:

• A step-down transformer. We will not name the number of turns in advance, the voltage is unknown, rectifying it with diodes, we get 12 volts. Of course, you can experiment, like the YouTube video about homemade radios Having captured the reader, we will look for a ready-made solution.
• The bridge is full-wave; by adding three to one diode, we increase the efficiency. Radio components are not very expensive.
• The backbone of the power supply is ready so that the homemade fan can serve for a long time, let’s straighten out the network ripples. After the bridge, we will turn on the low-pass filter and redraw the circuit from the Internet.

The output is a constant voltage with an amplitude of 12 volts. Be careful not to mix up the terminals. Where the “plus” comes out and where the “minus” comes out can be understood by studying the diagram. Below is a drawing of the bridge, look and read the explanations. In radio electronics, the direction of current is indicated opposite to the true one. Charges flow, according to popular belief, in the direction from plus to minus (towards electrons). Reading the diagram, you will see: the emitter of the diode, transistor, marked with an arrow, looks incorrectly. In the direction of movement of positive charges. Each one has marks and is indicated on the diagram by a huge triangle arrow. Consequently, we always find out “plus”, guided by the graphic symbols given in the drawing.

The figure shows: the plus will be on the right, transmitted according to the diode arrow to the lower output terminal. The minus will go up. With an alternating voltage (roughly speaking), plus and 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. Take power, low-frequency diodes. Solid size, power dissipation is relatively high. You can calculate using a simple formula taken from a physics course. We multiply the resistance of the open p-n junction (we leaf through the reference book) by the current consumed by the motor, taking a margin of at least 2 times. The motor housing contains an inscription indicating the power, which can be divided by the voltage of 12 volts, simply multiplied by 2 - 3, and taken a diode with equivalent power dissipation (see reference book).

Now let's calculate the transformer... We went here http://radiolodka.ru/programmy/radiolyubitelskie/kalkulyatory-radiolyubitelya/, chose the Trans50 program, we will master it. Please note that there is software that allows you to calculate filter parameters. Do you regret that you decided to make a fan yourself? They offer to choose one of 5 windings. Steel is involved everywhere. You can make do, the losses will be great. The steel forms a magnetic circuit, the energy goes to the secondary winding. It's better to find an old rusty transformer. Times are bad; in the hungry 90s, landfills were littered with plates of scrapped windings. There were no problems with winding the transformers.

It's time to understand what voltage is required for the correct operation of the circuit. A term borrowed from electronics will help: effective voltage alternating current. The voltage across the active resistance creating a thermal effect is equal to constant voltage effective amplitude. To obtain the required voltage 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. The engineering calculation has 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” into a search engine. Let's do it together with the readers. Smart articles write: the current consumption of the cooler is indicated on the case. Once you have the required parameter, we’ll plug it into the calculator. The author took the voltage of the secondary winding to be 19 volts. The voltage drop across p-n junctions of powerful silicon diodes is 0.5 - 0.7 volts. Therefore, an appropriate reserve is needed. Smart heads searched and concluded that the processor cooler does not consume more than 5 W, therefore, the current is 5 divided by 12 = 0.417 A. We substitute the numbers into the downloaded calculator, and for the strip core we get the transformer design parameters:

1. The cross-section of the magnetic core for winding is 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 wire with a thickness of 1 mm and 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, for 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 core 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 from begins to be decided by the core...

How effective are the proposed technical solutions? Fans are known Ancient Egypt. Evidenced by a Michael Jackson video recommending “Remember the time.” The plot was hardly prepared without the consultation 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 about it...