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.
Mark a hole for the switch with a marker and cut it nail scissors hole a little smaller size switch and insert the switch into the reel:
2. Now we form the fan frame: put 3 bobbins together and mark four holes for bolts or screws with a marker on the bottom of the upper bobbins. We burn holes through the edges of two bobbins:
3. Using a lighter, melt and clear the red wire from the section with batteries and attach it to one terminal of the switch, and to the other - the second red wire. To isolate the terminals from contact with each other, fill them with hot glue:
4. We attach the red wire to the plus + of the engine, and the black wire, respectively, to the minus - of the engine:
5. The top can be made from a gouache box: on the lid with a soldering iron we form a hole for the wires and 3 holes for the screws. And on the box itself we cut a hole with nail scissors slightly smaller 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 place the impeller from the cooler on the plug, fill the voids with plasticine or fill it with paraffin, use a screw or an awl to make a hole in the plug, fill it with epoxy glue or hot melt glue, and place it on the engine. If this epoxy resin- leave it to dry for a day and only then turn it on!
August 6, 2018
Sitting at the computer in summer time 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 you the manufacturing process and step by step instructions, we will highlight two of the simplest and most effective methods. 
Making a fan using a computer cooler
To make a fan at home and not have to strain at all, we found this method on the Internet. 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 pittance.
First we begin to prepare the cooler, it has two wires: red and black. We remove 10 mm of insulation from each wire; there is even an insulation stripper. The size of the cooler does not play a special role, of course, it is better if it is large, the wind flow will ultimately be stronger. 
We begin preparing the USB wire; to do this, cut off one half at 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 may be several ways, the main thing is to remember the 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 an interesting article where we make a laser level.
- We make 8 identical marks on the disk and cut everything along them.
- Then we heat up the disk and bend all the blades in the desired direction. To heat up the disc, just use a regular lighter, bend the blades carefully, if you do something wrong, you will have to buy a new disc.
- 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.
- We glue a special mount to the disk.
- We make the base of the case more stable; you can attach a regular disk.
- We hide all the wires and bring one out (to connect to the network).
- We attach the motor to the paper tube and immediately attach it to the base.
- We attach the blade to the engine.
- Now we connect the wires from the motor with a USB cable, as described above.
- This is the final result; if desired, the cardboard base can be painted over or decorated in some way.
Here are the guys with the video showing a really cool method. In a similar way You can make a fan out of paper, but remember, the paper must be thick; it’s best to use cardboard.
From time to time the need for a kind of fan arises, but small models are relatively expensive. There is no need to rush to shell out money, because a small fan can be easily made with my own hands. In terms of efficiency, it is not inferior to purchased analogues, and its creation will require a minimum amount of materials.
Making a fan from a cooler
The simplest way to make a fan yourself is to use an unnecessary cooler (these are used in computers as a cooling system for components).
It is not surprising that this method is the simplest, because a cooler is a small fan. There are only a few things left to do simple steps to give it its final shape and performance.
The cooler itself is quite functional, but you need to prepare it for non-standard way uses:
- Wires.
If the fan is located next to the computer, a regular unnecessary USB cable will do. It needs to be cut and the insulation removed (the same with the cooler wires):
We are only interested in two wires: red (plus) and black (minus). If there are other colors in the cooler or USB cable, feel free to cut them off and isolate them, since they are absolutely unnecessary and will only get in the way.
- Compound.
After cleaning, the wires need to be connected to each other (it is enough to twist them tightly together). Don't mix up the colors. This threatens serious complications in the process of creating a ventilator.
A length of 10 mm is sufficient for twisting. If necessary, you can clean most of the wire, this is not scary, but you will have to insulate much more.
- 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 covered with electrical tape (exclusively 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 while transmitting electricity, not only the USB cable/port, but also the computer components may burn out.
In principle, computers are not afraid of such moments if they are equipped with protection against voltage surges. But when a wall outlet is used, repairing the wiring in the apartment will be much more difficult than creating a small fan.
Therefore, take serious care to insulate the exposed parts of the wires. Rarely does anyone need unnecessary complications.
- The finishing touches.
Do not forget that computer cooler 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 do its job perfectly, and the operation will be as silent as possible.
Due to the small size of the device, it may fall due to vibrations. This should not be allowed for the following reasons:
- Such a cooler cannot cause lethal cuts even during operation, but there is no guarantee that the device will not jump up and fly off, for example, into the face;
- if it falls on a non-flat surface (on a pencil, pen, lighter), its blades can be damaged: fragments breaking off at such a rotation speed can cause irreparable damage;
- other unforeseen circumstances.
Therefore, it is important to secure the cooler (with tape, glue) to some more stable surface: a box, a wooden block, a table.
- Additional functions.
If desired, the finished fan can be updated externally, a switch can be added (so as not to pull out the cord every time), etc. But attention is also paid to a method that increases the efficiency of the device relatively well.
Simply cut off the top plastic bottle and glue it (with a wide hole) to the cooler frame. Thus, the air flow will be more accurate and directed: the force of air movement will become approximately 20% stronger, which is a pretty good indicator.
This completes the creation of the fan, and it is ready for full-time work.
Disc fan
If the previous option does not suit you, and you want something more complex, then consider self-creation fan from computer disks:
- Engine.
Since we don’t use a cooler, we need to get some kind of motor that drives the blades of our future device. In fact, you can also 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 specific part that moves (for example, a protruding iron rod). Since we are making a fan from disks, then the presence of such a rod will the best option. Motors from an old VCR or player are also perfect, because they spin discs and cassettes - just what we need for the spinning propeller in our fan.
You should not use an engine made from washing machine or even a past fan - they are extremely powerful. Due to the self-assembly of the structure, it will be very flimsy. In the very first seconds, a strong motor will scatter fragments of blades throughout the room and fly off the base.
If there is a running motor, it must be secured with wires in the previously mentioned form.
Having a running engine in hand, you need to concentrate on the disks, which are the main components of our fan. First of all, cut one into 8 equal parts:
To avoid mistakes during the procedure, you can first mark the disc with a pencil. It is best to use a soldering iron (there will be no sharp edges, it is safer), but ordinary scissors will also work.
Afterwards, the disk should be slightly heated with a lighter so that the material becomes more pliable, and the wings should be bent in the manner of blades, like conventional fans:
You can do the same with regular plastic bottle:
You need to insert a wooden bottle cap into the center of our propeller. If the size is too big, it can be planed.
- The remaining parts.
As a center holding the entire structure, you can use a regular roll sleeve toilet paper:
It should be secured in the center of the second disk, which will act as a foundation for the fan. You can place half of the second bushing on top, as seen in the photo, so that the motor is inside it. You need to hang the blades from the disk/bottle on it.
The fan is ready for operation. If desired, you can add decorative elements to make the device look more presentable.
You can see clearly how such a fan is made from a bottle in this video.
Additionally, it should be recalled that important points when creating a homemade fan:
- To fasten the parts together, you need to use high-quality “superglue”.
Exactly the one that you can’t peel off even if you want to. The entire structure must be as stable as possible and not succumb to vibrations and fluctuations. Be responsible and fill everything you see with glue except the blades and internal parts engine.
- Take your time.
You risk missing out important detail, and this significantly increases the chances that something will go wrong during the operation of the finished fan. The consequences can be quite serious.
- Do not use inferior components.
If you don’t need the motor that is used to create the engine, its performance may be in doubt. Make sure it will last for some time and be effective.
Building an engine from scratch is a highly specialized process and requires a lot of knowledge. Make sure that the motherboards are in order, that all necessary connections are sealed well, etc. It is better to check again than to make another fan later.
- Insulation.
We remind you once again: do not forget about high-quality winding of wires with electrical tape. You shouldn't save it, because short circuits and repairing them will force you to sacrifice a lot of expenses. Perhaps even in a monetary sense.
The hand-held fan is quite compact, efficient and does its job well. It is not difficult to do if you take the procedure responsibly and follow the instructions. There are no restrictions on dimensions: if you feel strong, feel free to start assembling the fan bigger size.
In contact with
Summer has arrived, which means heat, heat and an eternal lack of coolness. But this problem can be fixed, and quite easily. You only need a few details and a little free time to make your life easier with your own hands, to fill it with the slight coolness that you will certainly get by making a USB fan at home. Of course, you can go and buy a fan in a store, but how nice it will be to sit next to the same computer, and a light breeze from the USB fan you created will blow on you. And a thing created with your own hands always pleases not only the eye, but also develops self-love.
We invite you to watch a video of a homemade USB fan:
Tools for usb fan:
- A regular CD (not necessarily new);
- The tube of silicone glue is empty;
- Wooden block;
- Mini disk;
- USB cord;
- Motor;
- Holder;
- Adapter;
- Silicone glue gun.
You need to make three holes in the tube, one in the lid and two on the sides. Holes can be easily made using a regular nail, which must first be heated.
IN wooden block it is also necessary to make a slot or recess. This can be easily done using sandpaper.
The mini disk easily turns into a propeller. To do this, it must be drawn into uniform blades, then heated stationery knife and cut along the pre-drawn lines. And after that, we heat the base of each blade with a lighter and, using our hands, 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 seated on this glue. Press on all sides. Then, on the other side of the holder, add a drop of glue and glue the adapter. We wait until the glue dries well. This usually only takes a couple of minutes.
Now take a tube of silicone glue, remove the lid and coat the inside with silicone glue. And we insert the motor inside so that the part that we will connect sticks out of the hole that we originally made.
Then we insert the USB cord into the side hole of the glue tube and connect the ends of the wires to the motor.
You need to pour silicone glue into the recess in the wooden block, and place the wire from the USB cord tightly there, and glue the tube itself with the motor inside to the base of the block. And on the other side of the block we glue the CD with silicone glue.
Now the propeller needs to be placed on the side of the adapter glued to it onto the sharp edge of the motor, which sticks out of the hole in the tube from under the glue.
And finally, our USB fan can be plugged into the network and get that long-awaited coolness.
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 is a commutator motor. Often deprived of the ability to regulate speed. Decide whether a similar level is acceptable at the installation site for a homemade fan. sound pressure? 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:
- Alignment of stator and rotor.
- 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. Most household models are 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. The yellow wire goes to 12 volts (red to 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. As for the washing machine, put the drum on 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. A Western innovator decides to replace the coil with a permanent magnet. Indeed, there is no alternating field - why electric current?
The author demonstratively cuts off the power cord and places neodymium magnets ( hard drive) frame perimeter. 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 patent holder.
The initial movement of the blade is obtained by random air fluctuations. Reminiscent of a magnetron, the oscillations are caused by natural chaotic movement 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 stirring things up USB ports, 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, we measured the direction and strength of the magnetic field of the 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. As a last resort, take the “crown”; 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. 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 that it’s difficult to expect much power - even if the port supports it, the motor won’t pull it. 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 not collecting pulse block food, do it yourself 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, grab the reader and 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. Therefore, we always find out “plus”, guided by graphic symbols shown 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 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 training course physics. 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. Voltage at the active resistance creating a thermal effect equal to the constant voltage of the effective amplitude. To obtain the required voltage on the secondary winding, you need to divide 12 volts by 0.707 (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. Will required parameter, put 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:
- The cross-section of the magnetic core for winding is 25 x 32 mm.
- Window in the magnetic circuit 25 x 40 mm.
- 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.
- 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...
