It is difficult not to notice how stable the supply of electricity to suburban facilities differs from providing urban buildings and enterprises with electricity. Admit that you, as the owner of a private house or cottage, have repeatedly experienced interruptions, inconveniences associated with them, and damage to equipment.
These negative situations, together with the consequences, will no longer complicate the life of lovers of natural open spaces. Moreover, with minimal labor and financial costs. To do this, you just need to make a wind generator of electricity, which we describe in detail in the article.
We have described in detail the options for manufacturing a system that is useful in the economy and eliminates energy dependence. According to our advice, an inexperienced home foreman can build a wind generator with his own hands. A practical device will help to significantly reduce daily expenses.
Legality of installing a wind generator
Alternative energy sources are the dream of any summer resident or homeowner, whose site is located far from the central networks. However, receiving bills for electricity consumed in a city apartment, and looking at increased tariffs, we realize that a wind generator created for domestic needs would not be in the way.
After reading this article, perhaps you will make your dream a reality.
A wind generator is an excellent solution for providing a suburban facility with electricity. Moreover, in some cases, its installation is the only possible way out.
In order not to waste money, effort and time, let's decide: are there any external circumstances that will create obstacles for us during the operation of the wind generator?
To provide electricity to a cottage or a small cottage, a sufficiently small wind power installation, the power of which will not exceed 1 kW, is enough. Such devices in Russia are equated to household products. Their installation does not require certificates, permissions or any additional approvals.
In order to determine the appropriateness of a wind generator device, it is necessary to find out the wind energy potential of a particular area (click to enlarge)
No taxation of electricity production, which is spent on providing for their own domestic needs, is not provided. Therefore, a low-power windmill can be safely installed, generated with its help free electricity, without paying the state any taxes.
However, just in case, you should ask if there are any local regulations regarding individual energy supply that could create obstacles to the installation and operation of this device.
Wind generators, which are able to satisfy most of the needs of medium-sized farms, can not cause complaints even from the neighbors
Claims may arise with your neighbors if they experience inconvenience associated with the operation of the windmill. Do not forget that our rights end where the rights of others begin.
Therefore, when buying or making a wind generator for your home, you need to pay serious attention to the following parameters:
- Mast height. When assembling a wind generator, it is necessary to take into account the restrictions on the height of individual buildings that exist in a number of countries of the world, as well as the location of your own site. Be aware that nearby bridges, airports, and tunnels of buildings with a height exceeding 15 meters are prohibited.
- Noise from gearbox and vanes. The parameters of the generated noise can be set using a special device, and then document the results of measurements. It is important that they do not exceed established noise standards.
- Ethereal interference. Ideally, when creating a windmill, protection from creating tele-interference should be provided where your device can provide such troubles.
- Claims of environmental services. This organization may only prevent you from operating the installation if it interferes with the migration of migratory birds. But this is unlikely.
When creating and installing the device yourself, learn these points, and when buying a finished product, pay attention to the parameters that appear in his passport. It is better to protect yourself in advance than subsequently to be upset.
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Conditions for installing a wind farm
Extensive site for installing a wind generator
The location of a powerful wind generator relative to neighbors
The price of electricity as an argument for a wind generator
Installation of a windmill must be approved by local authorities
Mini power station in places with interruptions in the supply of electricity
Using a factory-made wind generator
Do-it-yourself budget option
The principle of operation of a wind turbine
A wind generator or wind turbine (wind turbine) is a device that is used to convert the kinetic energy of a wind stream into mechanical energy. The resulting mechanical energy rotates the rotor and is converted into the electrical form we need.
The principle of operation and the device of a kinetic windmill are described in detail in an article with which we recommend that you familiarize yourself.
The structure of wind turbines includes:
- propeller blades
- turbine rotating rotor
- the axis of the generator and the generator itself,
- an inverter that converts alternating current into direct current, used to charge batteries,
- battery.
The essence of wind turbines is simple. During the rotation of the rotor, a three-phase alternating current is generated, which then passes through the controller and charges the DC battery. Further, the inverter converts the current so that it can be consumed by powering the lighting, radio, TV, microwave and so on.
The detailed device of a wind generator with a horizontal axis of rotation allows you to clearly imagine which elements contribute to the conversion of kinetic energy into mechanical and then into electrical energy
In general, the principle of operation of a wind generator of any type and design is as follows: in the process of rotation there are three types of force acting on the blades: braking, impulse and lifting.
This scheme of the wind turbine allows you to understand what is happening with the electricity produced by the wind generator: part of it is accumulated, and the other is consumed
The last two forces overcome the braking force and set the flywheel in motion. On the fixed part of the generator, the rotor generates a magnetic field so that an electric current flows through the wires.
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The engine for the simplest windmill
The specifics of connecting the motor with the blades
The balance of the tail and frontal part
Rules for installing a wind generator
Classification of types of energy generators
There are several signs by which wind power installations are classified. How to choose the best version of the device for suburban ownership is described in detail in one of the most popular articles on our website.
So, windmills differ in:
- the number of blades in the propeller;
- blade materials;
- the location of the axis of rotation relative to the surface of the earth;
- step sign of screw.
There are models with one, two, three blades and multi-blade.
Products with a large number of blades begin to rotate even with a small wind. Usually they are used in such works when the rotation process itself is more important than generating electricity. For example, to extract water from deep wellbores.
It turns out that the blades of a wind generator can be made not only from solid materials, but also from affordable fabric
The blades can be sailing or rigid. Sailing products are much cheaper than rigid ones, the manufacture of which is metal or fiberglass. But they have to be repaired very often: they are fragile.
As for the location of the axis of rotation relative to the earth's surface, there are vertical windmills and horizontal models. And in this case, each variety has its own advantages: vertical ones respond more sensitively to every blow of the wind, but horizontal ones are more powerful.
Wind generators are divided by step signs into models with fixed and variable steps. Variable pitch allows you to significantly increase the speed of rotation, but this installation has a complex and massive design. Fixed-pitch wind turbines are simpler and more reliable.
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From disassembling a damaged generator after disassembling, only the stator remained, for which the housing was separately welded
In order to restore the technical characteristics of the engine, it is necessary to rewind 36 stator coils. In rewinding, a wire with a diameter of 0.56 mm is required. 35 turns need to be made
Before mounting the blades, the repaired engine must be assembled, varnished or at least epoxy, the surface must be painted
The wires are connected in parallel, three wires are output for connection to a power source
The axis, designed to ensure rotation, is made from the pipe outlet 15. Bearings are welded to the axis, which are rolled through a pipe segment 52
In the manufacture of the tail, 4 mm thick galvanized sheet steel was used, bent around the edges and installed in a groove selected in the rail
The blades are cut from a polymer sewer pipe, attached to a triangle connected to the motor with screws
A practically free wind generator can be made from waste parts: an engine from an old car and a sewer pipe cut
Step 1: Dismantling a used generator
Step 2: Restore Engine Capabilities
Step 3: Assembling a rebuilt engine for a wind turbine
Step 4: Connect the motor wires and output them to the power line
Step 5: Specific Features of the Rotary Assembly
Step 6: Making the tail to respond to the wind
Step 7: Attaching the blades of a mini wind farm
Step 8: Build a practically free power generator
Rotor type wind turbine
We will figure out how to make a simple windmill with a vertical axis of rotation of the rotor type with your own hands. Such a model may well provide for the electricity needs of a garden house, various outbuildings, as well as illuminate the house area and garden paths in the dark.
The blades of this rotor-type installation with a vertical axis of rotation are clearly made of elements cut from a metal barrel
Our goal is to manufacture a windmill with a maximum power of 1.5 kW.
To do this, we need the following elements and materials:
- 12V car generator;
- 12 V helium or acid battery;
- semi-sealed switch of the “button” type at 12 V;
- converter 700 W - 1500 W and 12V - 220V;
- a bucket, a large-capacity pan or other capacious container made of stainless steel or aluminum;
- car relay control lamp charge or charge the battery;
- automobile voltmeter (any one is possible);
- bolts with nuts and washers;
- wires with a cross section of 4 square mm and 2.5 square mm;
- two clamps to secure the generator to the mast.
In the process of doing the work, we will need a grinder or scissors for metal, a construction pencil or marker, a tape measure, wire cutters, a drill, a drill, keys and a screwdriver.
The controller for the power generating system can also be assembled by yourself. The article, the contents of which we advise you to familiarize yourself with the rules and patterns of manufacturing a controller for a windmill,
The initial stage of the installation
Making a homemade windmill we begin by taking a large metal tank of cylindrical shape. Usually, an old boil-down, bucket or pan is used for this purpose. It will be the basis for our future wind turbine.
Using a tape measure and a construction pencil (marker), we mark up: divide our capacity into four identical parts.
When making cuts in accordance with the instructions contained in the text, in no case cut the metal to the end
The metal will have to be cut. You can use a grinder for this. It is not used for cutting containers made of galvanized steel or painted tin, because this kind of metal will necessarily overheat. For such cases, it is better to use scissors. We cut the blades, but do not cut them to the very end.
Options, schemes and recommendations for the manufacture of various models of blades for a wind generator can be found in our recommended article.
Along with the continuation of work on the tank, we will redo the generator pulley. In the bottom of the former pan and in the pulley, you need to outline and drill holes for the bolts. The work at this stage should be taken as carefully as possible: all openings should be located symmetrically so that no imbalance occurs during rotation of the installation.
This is how the blades of another design with a vertical axis of rotation look. Each blade is made separately, and then mounted in a common device
Bend the blades so that they do not stick out too much. When we do this part of the work, be sure to consider in which direction the generator will rotate.
Usually the direction of its rotation is oriented clockwise. The bending angle of the blades affects the area of impact of air currents and the speed of rotation of the propeller.
Now you need to fix the bucket with the blades prepared for work on the pulley. We install the generator on the mast, fixing it with clamps. It remains to connect the wires and assemble the circuit. Prepare to record the wiring diagram, wire colors, and pin markings. Later it will certainly come in handy. We fix the wires on the mast of the device.
This figure contains detailed recommendations for the assembly of the overall structure and the general view of the device already assembled and ready for use
To connect the battery, you need to use wires with a cross section of 4 mm². It is enough to take a length of 1 meter. That’s enough.
And in order to connect the load to the network, which includes, for example, lighting and electrical devices, enough wires with a cross section of 2.5 mm² are enough. Install the inverter (converter). For this, a 4 mm² wire will also be needed.
Advantages and disadvantages of a rotor model of a windmill
If you did everything neatly and consistently, then this wind generator will work successfully. In this case, no problems during its operation will arise.
If you use a 1000 W converter and a 75A battery, this installation will provide electricity and video surveillance devices, and burglar alarms and even street lighting.
The advantages of this model are as follows:
- economical;
- elements can easily be replaced with new ones or repaired;
- special conditions for functioning are not needed;
- reliable in operation;
- provides complete acoustic comfort.
There are also disadvantages, but not so many: the performance of this device is not too high, and it has a significant dependence on sudden gusts of wind.Air flows can simply disrupt an improvised propeller.
In order to accurately select the model of the wind generator of the required power before starting work, we recommend that you make the calculation according to the formulas given in the recommended article.
Assembly of axial wind turbines on neodymium magnets
Since neodymium magnets appeared in Russia relatively recently, axial wind generators with ironless stators began to be made not so long ago.
The appearance of magnets caused a rush of demand, but gradually the market was saturated, and the cost of this product began to decline. It became available to craftsmen who immediately adapted it for their various needs.
Axial wind turbines with neodymium magnets with a horizontal axis of rotation - a more complex design that requires not only skill but also certain knowledge
If you have a hub from an old car with brake discs, then we will take it as the basis for the future axial generator.
It is assumed that this part is not new, but already in operation. In this case, it is necessary to disassemble, check and lubricate the bearings, carefully clean away sedimentary deposits and all rust. Ready generator do not forget to paint.
A hub with brake discs, as a rule, goes to craftsmen as one of the components of an old car that has been scrapped, therefore it needs to be thoroughly cleaned
Magnet distribution and fixing
Neodymium magnets must be glued to the rotor discs. For our work, we take 20 magnets 25x8mm.
Of course, you can use a different number of poles, but the following rules must be observed: the number of magnets and poles in a single-phase generator must be the same, but if we are talking about a three-phase model, the ratio of poles to coils should be 2/3 or 4/3 .
When placing magnets, the poles alternate. It is important not to make a mistake. If you are not sure that you will arrange the elements correctly, make a hint template or apply sectors directly to the disk itself.
If you have a choice, it is better to buy not round, but rectangular magnets. In rectangular models, the magnetic field is concentrated along the entire length, and in round ones, in the center.
Opposing magnets must have different poles. You will not confuse anything if you use a marker to mark them with minus or plus signs. To identify the poles, take the magnets and hold them to each other.
If surfaces are attracted, put a plus on them; if they repel, then mark them with minuses. When placing magnets on disks, alternate the poles.
Magnets are installed in compliance with the policy of alternating policies; plasticine borders are located along the outer and inner perimeters: the product is ready for epoxy resin casting
For reliability of magnet fixing it is necessary to apply high-quality and maximally strong glue.
To enhance the reliability of fixation, you can use epoxy resin. It should be diluted as indicated in the instructions, and fill it with a disk. The resin should cover the entire disc, but not drain from it. It is possible to prevent the possibility of runoff if you wrap the disk with tape or make temporary plasticine protections from a polymer strip around its perimeter.
Single-phase and three-phase generators
If we compare single-phase and three-phase stators, then the latter will be better. The single-phase generator vibrates when loaded. The cause of the vibration is the difference in the amplitude of the current, arising due to its non-constant return for a point in time.
The three-phase model has no such drawback. It is distinguished by constant power due to phases compensating each other: when an increase in current occurs in one, it falls in the other.
According to the results of testing, the return of the three-phase model is almost 50% more than the same indicator of the single-phase.Another advantage of this model is that in the absence of unnecessary vibration, acoustic comfort increases when the device is functioning under load.
That is, a three-phase generator practically does not buzz during its operation. When vibration decreases, the life of the device logically increases.
In the struggle between three-phase and single-phase devices, three-phase always wins, because it does not buzz so much during operation and lasts longer than single-phase
Coil Winding Rules
If you ask a specialist, he will say that before you reel the coils, you need to perform a thorough calculation. The practitioner in this matter will rely on his intuition.
We chose a not too fast option generator. We have a procedure for charging a twelve-volt battery should begin at 100-150 rpm. Such initial data require that the total number of turns of all coils be 1000-1200 pieces. We still have to divide this figure between all the coils and determine how many turns will be on each.
A low-speed windmill can be more powerful if the number of poles increases. The frequency of the current oscillations in the coils will increase. If a larger cross-section wire is used for winding coils, the resistance will decrease, and the current strength will increase. Do not lose sight of the fact that a higher voltage can “eat up” the current due to the resistance of the winding.
The winding process can be facilitated and made more efficient if you use a special machine for this purpose.
It is not necessary to do such a routine process as winding coils manually. A bit of ingenuity and an excellent machine that can easily cope with winding are already there
The performance and performance of homemade generators are greatly influenced by the thickness and number of magnets that are located on the discs. The total final power can be calculated if you wind one coil, and then scroll it in the generator. The future power of the generator is determined by measuring the voltage at specific speeds without load.
We give an example. With a resistance of 3 ohms and 200 rpm, 30 volts comes out. If we subtract 12 volts of battery voltage from this result, we get 18 volts. Divide this result by 3 ohms and get 6 amperes. The volume is 6 amperes and will go to the battery. Of course, in the calculation we did not take into account losses in the wires and on the diode bridge: the actual result will be less than the calculated one.
Usually the coils are made round. But, if you pull them out a little, you will get more copper in the sector and the turns will be straighter. If we compare the size of the magnet and the diameter of the inner hole of the coils, then they must correspond to each other or the size of the magnet may be slightly smaller.
Ready-made coils should correspond to their magnets in size: they should be slightly larger than magnets or equal to their magnitude
The thickness of the stator, which we do, should correctly correlate with the thickness of the magnets. If the stator is done more by increasing the number of turns in the coils, the inter-disk space will increase, and the magnetic flux will decrease. The result may turn out to be this: the same voltage is generated, but, due to the increased resistance of the coils, we get a lower current.
Plywood is used to make the stator mold. However, sectors for coils can be marked out on paper using plasticine as borders.
If fiberglass is placed on top of the coils at the bottom of the mold, the strength of the product will increase. Before applying the epoxy resin, you need to grease the mold with Vaseline or wax, then the resin will not stick to the mold. Some use tape or tape instead of grease.
Between themselves, the coils are fixed motionless. In this case, the ends of the phases are brought out. Six outward wires should be connected with a star or a triangle. Rotating the assembled generator by hand, test it.If the voltage is 40 V, then the current will be approximately 10 amperes.
Final assembly of the device
The length of the finished mast should be approximately 6-12 meters. With such parameters, its base should be concreted. The windmill itself will be mounted on the top of the mast.
So that it can be reached in the event of a breakdown, it is necessary to provide a special mount at the base of the mast, which will allow the pipe to be raised and lowered using a hand winch.
The mast rises high with a wind generator attached to it, but the prudent foreman made a special device that allows, if necessary, lower the structure to the ground
To make a screw, you can use a PVC pipe with a diameter of 160 mm. It will be used to cut a two-meter screw consisting of six blades from its surface. The shape of the blades is best developed independently by experience. The goal is to increase torque at low revs.
The propeller should be protected from excessive wind. To solve this problem, use a folding tail. The generated energy is stored in batteries.
For the attention of our readers, we have provided two versions of 220-do-it-yourself wind generators that enjoy the increased attention not only of owners of suburban real estate, but also ordinary summer residents.
Both wind turbine models are effective in their own way. These devices can demonstrate particularly good results in the steppe area with frequent and strong winds. They are effective enough to be used in the organization of alternative home heating and in the supply of electricity. And they are not so difficult to build with their own hands.
This video shows an example of a wind turbine with a horizontal axis of rotation. The author of the device explains in detail the nuances of the do-it-yourself installation design, draws the attention of viewers to errors that can be made in the process of self-manufacturing a wind generator, gives practical advice.
Please note that getting to a device elevated to a decent height is not so easy. Reinstalling such a wind turbine will most likely be problematic. Therefore, the folding mast design in this case will not be superfluous.
This video shows a rotary wind turbine with a vertical axis of rotation. This installation is not high, it was made originally and is highly sensitive: even a slight wind drives the blades of the device.
If you live in an area where winds are not considered a rare occurrence, the use of this particular source of alternative energy may be most effective for you. The above examples of self-made windmills prove that making them yourself is not so difficult. Wind energy is a publicly available and renewable resource that can and should be used.
Those who are interested in the topic of the article are invited to express their opinion in the comments and ask questions that arose during the familiarization with the material.