Simple FET inductor circuit. DIY induction heating. Technique for removing energy from a current transformer. From a welding inverter

The induction heater is a high stage in the evolution of electrical appliances. Thanks to this device, you can significantly save energy consumption. The heat generator used in this device is completely harmless, does not emit soot during operation. For example, in terms of efficiency, a heating boiler (the diagram of an induction heater is shown below) is second only to an infrared heater. However, unlike infrared devices, which are sold only in specialized stores, induction heaters can not only be bought, but also assembled by hand.

Such devices come in several levels of complexity and purpose, for example, for water and metal. Their devices, of course, are different, but the principle of operation is identical. The photo below shows a diagram of an induction metal heater; it is quite easy to assemble this device using it.

So, in this article we will consider the process of assembling an induction heater from improvised means that can be found in the "bins" of any home master.

How does a DIY induction heater work?

The principle of operation of a homemade heater is no different from a factory device. That is, the coolant circulates in the core, heating up from its walls or contents. It heats up due to the eddy currents generated by the winding.

Important: polymer cores are stuffed with chopped wire!

In turn, the winding is wound around the core body and closed to a high-frequency current source. It is this energy that is able to generate an alternating electromagnetic field - the root cause of the appearance of eddy currents in a stationary core (or its filler).

The scheme of the induction water heater, presented below, is often used in heating boilers.

A conventional or more complex system based on a transformer and a frequency converter can act as a source of high-frequency alternating current.

It should be noted that with the right approach to choosing a source and forming a winding, you can create a really effective device that will work no worse than its factory counterpart. By the way, in its kit there is always an instruction and a diagram of the induction heater.

We assemble an induction device with our own hands: important details

To assemble such a heater you will need:

It is this device that will be a source of high-frequency alternating electric current that feeds the inductor.

After that, you need to take Wind it with a spring on the core body. This device will act as an inductor. It is very important to connect the wire contacts to the inverter terminals, avoiding soldering and twisting. Based on this, the piece of this material used to form the core must be of sufficient length. The number of turns is usually 50 and the wire diameter is usually 3 mm. The diagram of an induction heater shows the connection sequence of the individual components.

Making the core

The core is an ordinary polymer pipe made of cross-linked polyethylene or polypropylene. These grades of plastics withstand the highest possible temperatures. The throughput diameter of the core pipe should be 50 mm, and the wall thickness cannot be less than 2.5-3 mm. Then this part can be used as a caliber on which copper wire is wound, forming an inductor.

An approximate diagram of an induction heater is shown in this picture.

The heating element of such a boiler will be a polymer core filler - chopped pieces with a diameter of 7 mm. Moreover, their length cannot be less than 5 cm.

Assembly of the device using the example of a heating induction boiler

The process of assembling all these components into a single system is as follows:

First, take a piece of polymer pipe, fix it and wind 50 turns of 3 mm copper wire over the future core.
Next, cut the ends of the core, leaving 7-10 cm from the edge of the wire to the taps.

Important: Do-it-yourself induction heater circuit is carried out in several stages, the sequence of which should not be violated in any case. To avoid mistakes, you must follow the instructions exactly.

When making an induction heater with your own hands, you need to worry about the safety of the device. To do this, it is necessary to be guided by the following rules that increase the level of reliability of the overall system:

A safety valve should be inserted into the upper tee to relieve excess pressure. Otherwise, if the circulation pump fails, the core will simply burst under the influence of steam. As a rule, the scheme of a simple induction heater provides for such moments.
The inverter is connected to the network only through the RCD. This device works in critical situations and will help to avoid a short circuit.
The welding inverter must be grounded by leading the cable to a special metal circuit mounted in the ground behind the walls of the structure.
The body of the induction heater must be placed at a height of 80 cm above the floor. Moreover, the distance to the ceiling must be at least 70 cm, and to other pieces of furniture - more than 30 cm.
An induction heater generates a very strong electromagnetic field and should therefore be kept away from living quarters and pet enclosures.

Summarizing

A do-it-yourself induction heater will work no worse than a factory appliance. It is not inferior in performance, efficiency and safety, of course, if all the rules have been followed.

Many people are attracted to electric heating by the fact that it works autonomously and does not need to be constantly looked after. The negative side of such heating boilers is the cost and technical requirements.

In some places, they simply cannot be applied. But many owners are not afraid of this, and they believe that it is the ease of operation that covers all the shortcomings.

Especially when new types appeared on the markets with inductive coils, and not TENs. They heat up the building with instantaneous speed and economically heat the building, according to the owners of the units. The new type of boilers is called induction.

The new type of heaters is convenient in operation. They are considered safe, in comparison with gas heaters, there is no soot and soot, which cannot be said about solid fuel appliances. And the most important advantage is that there is no need to procure solid fuel (coal, firewood, etc.).

And as soon as induction heaters appeared, there were immediately craftsmen who, in order to save money, are trying to create such an installation with their own hands.

In this article, we will help you design a heating device yourself.

A device where metal and similar products are heated without contact is called an induction heater. The work is controlled by an alternating induction field acting on the metal, and the currents inside form heat.

High frequency currents act on products in addition to insulation, which is why the design is extraordinary compared to other types of heating.

In today's induction heaters there are semiconductor frequency reducers. This type of heating is widely used in the heat treatment of surfaces made of steel and various compounds and alloys.

The compactness of the equipment is used in innovative technologies, while there is a huge economic effect. A variety of models help implement flexible and automated combinations, including all-round type transistor frequency reducers and connection blocks when an induction system is preferred.

Description

Heater device

The composition of a typical heating element includes the following components:

A heating element in the form of a rod or a metal tube.
Inductor- This is a copper wire framing the coil with turns. During operation, it plays the role of a generator.
Alternator. A separate structure where the standard current is converted into a value with a high frequency.

In practice, induction installations are used recently. Theoretical studies are far ahead. This can be explained by one obstacle - obtaining a high frequency of magnetic fields. The fact is that using low-frequency settings is considered inefficient. As soon as they appeared with a high frequency, the problem was resolved.

HDTV generators have passed their evolutionary period; from lamp to modern models based on IGBT. Now they are more efficient, have a small weight and dimensions. Their frequency limitation is 100 kHz due to the dynamic losses of transistors.

Principle of operation and scope

The generator increases the frequency of the current and transfers its energy to the coil. The inductor converts high-frequency current into an alternating electromagnetic field. Electromagnetic waves change with high frequency.

Heating occurs due to the heating of eddy currents, which are provoked by variable eddy vectors of the electromagnetic field. Energy with high efficiency is transmitted almost without loss and there is enough energy to heat the coolant and even more.

The battery energy is transferred to the coolant, which is located inside the pipe. The heat carrier, in turn, is the cooler of the heating element. As a result, the service life is increased.

The industry is the most active consumer of induction heaters, as many designs involve high heat treatment. With their use, the strength of products increases.

In high-frequency forges, devices with high power are installed.

Forging and pressing companies, using such units, increase labor productivity and reduce the wear of dies, reduce metal consumption. Installations with through heating can cover a certain number of workpieces at once.

In case of surface hardening of parts, the use of such heating makes it possible to increase wear resistance several times and obtain a significant economic effect.

The generally accepted field of application of devices is soldering, melting, heating before deformation, HDTV hardening. But there are still zones where single-crystal semiconductor materials are obtained, epitaxial films are built up, materials are foamed into el. field, high-frequency welding of shells and pipes.

Advantages and disadvantages

Pros:

High quality heating.
High control precision and flexibility.
Reliability. It can work autonomously with automation.
Heats any liquid.
The efficiency of the device is 90%.
Long service life(up to 30 years).
Ease of mounting.
The heater does not collect scale.
Due to automation, energy savings.

Minuses:

The high cost of models with automation.
Dependence on power supply.
Some models are noisy.

How to do it yourself?

Wiring diagram of the induction heater

Let's say you decide to make an induction heater yourself, for this we prepare a pipe, pour small pieces of steel wire (9 cm in length) into it.

The pipe can be plastic or metal, most importantly, with thick walls. Then, it is closed with special adapters from all sides.

Next, we wind copper wire on it up to 100 turns and place it in the central part of the tube. The result is an inductor. We connect the output part of the inverter to this winding. As an assistant, we resort to.

The pipe acts as a heater.

We prepare the generator and assemble the entire structure.

Required materials and tools:

stainless steel wire or wire rod (diameter 7 mm);
water;
enameled copper wire;
metal mesh with small holes;
adapters;
thick-walled plastic pipe;

Walkthrough:

Mode wire into pieces, 50 mm long.
We prepare the shell for the heater. We use a thick-walled pipe (diameter 50 mm).
We close the bottom and top of the case with a net.
Preparing the induction coil. With a copper wire, we wind 90 turns on the body and place them in the center of the shell.
Cut out part of the pipe from the pipeline and install an induction boiler.
We connect the coil to the inverter and fill the pot with water.
We ground the resulting structure.
We check the system in operation. Do not use without water, as the plastic pipe may melt.

From a welding inverter

The simplest budget option is to manufacture an induction heater using a welding inverter:

To do this, take a polymer pipe, its walls should be thick. From the ends we mount 2 valves and connect the wiring.
Pour the pieces into the pipe(diameter 5 mm) metal wire and mount the top valve.
Next, we make 90 turns around the pipe with copper wire, we get an inductor. The heating element is a pipe, we use a welding machine as a generator.
The device must be in AC mode. with high frequency.
We connect the copper wire to the poles of the welding machine and check the work.

Working as an inductor, a magnetic field will be radiated, while eddy currents will heat up the chopped wire, which will lead to boiling water in the polymer pipe

Open sections of the structure, for safety reasons, should be isolated.
The use of an induction heater is recommended only in closed heating systems, where a pump is equipped to circulate the coolant.
The design with an induction heater is placed 800 mm from the ceiling, 300 from furniture and walls.
Installing a pressure gauge will secure your design.
It is desirable to equip the heating device with an automatic control system.
The heater must be connected to the mains with special adapters.

The principle of operation of an induction heater is based on two physical effects: the first is that when a conducting circuit moves in a magnetic field, an induced current appears in the conductor, and the second is based on the release of heat by the metals through which the current is passed. The first induction heater was implemented in 1900, when a method of non-contact heating of a conductor was found - for this, high-frequency currents were used, which were induced using an alternating magnetic field.

Induction heating has found application in various fields of human activity due to:

fast heating;
the ability to work in media of various physical properties (gas, liquid, vacuum);
no pollution by combustion products;
selective heating options;
shapes and sizes of the inductor - they can be any;
the possibility of process automation;
high percentage of efficiency - up to 99%;
environmental friendliness - no harmful emissions into the atmosphere;
long service life.

Scope of application: space heating

In everyday life, the induction heater circuit was implemented for and stoves. The former have gained especially great popularity and recognition among users due to the absence of heating elements, which reduce performance in boilers with a different operating principle, and detachable connections, which saves on maintenance of induction heating systems.

Note: The scheme of the device is so simple that it can be created at home, and you can create a home-made heater with your own hands.

In practice, several options are used, where different types of inductors are used:

electronically controlled heaters to create currents of the desired type in the coil;
vortex induction heaters.

Operating principle

The latter option, most commonly used in heating boilers, has become in demand due to the simplicity of its implementation. The principle of operation of the induction heating unit is based on the transfer of magnetic field energy to the coolant (water). The magnetic field is formed in the inductor. Alternating current, passing through the coil, creates eddy currents that transform energy into heat.

The water supplied through the lower pipe to the boiler is heated by energy transfer, and exits through the upper pipe, getting further into the heating system. A built-in pump is used to create pressure. Constantly circulating water in the boiler does not allow the elements to overheat. In addition, during operation, the heat carrier vibrates (at a low noise level), due to which scale deposits on the inner walls of the boiler are impossible.

Induction heaters can be implemented in various ways.

Implementation at home

Induction heating has not yet sufficiently conquered the market due to the high cost of the heating system itself. So, for example, for industrial enterprises, such a system will cost 100,000 rubles, for domestic use - from 25,000 rubles. and higher. Therefore, the interest in circuits that allow you to create a home-made induction heater with your own hands is quite understandable.

Transformer based

The main element of the induction heating system with a transformer will be the device itself, which has a primary and secondary windings. Vortex flows will form in the primary winding and create an electromagnetic induction field. This field will affect the secondary, which is, in fact, an induction heater, physically implemented in the form of a heating boiler body. It is the secondary short-circuited winding that transfers energy to the coolant.

The main elements of the induction heating installation are:

core;
winding;
two types of insulation - thermal and electrical insulation.

The core is two ferrimagnetic tubes of different diameters with a wall thickness of at least 10 mm, welded into each other. A toroidal winding of copper wire is made along the outer tube. It is necessary to impose from 85 to 100 turns with an equal distance between the turns. Alternating current, changing in time, creates vortex flows in a closed circuit, which heat the core, and hence the coolant, by induction heating.

Using high frequency welding inverter

An induction heater can be created using a welding inverter, where the main components of the circuit are an alternator, an inductor and a heating element.

The generator is used to convert the standard 50 Hz mains frequency into a higher frequency current. This modulated current is applied to a cylindrical inductor, where copper wire is used as a winding.

The coil creates an alternating magnetic field, the vector of which changes with the frequency set by the generator. The created eddy currents, induced by the magnetic field, heat the metal element, which transfers energy to the coolant. Thus, another do-it-yourself induction heating scheme is implemented.

A heating element can also be created with your own hands from a cut metal wire about 5 mm long and a piece of a polymer pipe into which the metal is placed. When installing valves at the top and bottom of the pipe, check the filling density - there should be no free space. According to the scheme, about 100 turns of copper wiring are superimposed on top of the pipe, which is the inductor connected to the generator terminals. Induction heating of copper wire occurs due to eddy currents generated by an alternating magnetic field.

Note: Do-it-yourself induction heaters can be made according to any scheme, the main thing to remember is that it is important to carry out reliable thermal insulation, otherwise the efficiency of the heating system will drop significantly.

Safety regulations

For heating systems that use induction heating, it is important to follow a few rules to avoid leaks, loss of efficiency, energy consumption, and accidents.

Induction heating systems require a safety valve to release water and steam in case the pump fails.
A manometer and an RCD are required for the safe operation of a do-it-yourself heating system.
The presence of grounding and electrical insulation of the entire induction heating system will prevent electric shock.
In order to avoid the harmful effects of the electromagnetic field on the human body, it is better to take such systems outside the residential area, where installation rules should be observed, according to which the induction heating device should be placed at a distance of 80 cm from horizontal (floor and ceiling) and 30 cm from vertical surfaces.
Before turning on the system, be sure to check the presence of the coolant.
To prevent malfunctions in the electrical network, it is recommended to connect a do-it-yourself induction heating boiler according to the proposed schemes to a separate supply line, the cable cross section of which will be at least 5 mm2. Ordinary wiring may not be able to withstand the required power consumption.

Before we talk about how to assemble a homemade induction heater, you need to find out what it is and how it works.

History of induction heaters

In the period from 1822 to 1831, the famous English scientist Faraday conducted a series of experiments, the purpose of which was to achieve the conversion of magnetism into electrical energy. He spent a lot of time in his laboratory. Until one day, in 1831, Michael Faraday finally got his way. The scientist finally managed to get an electric current in the primary winding from a wire that was wound on an iron core. This is how electromagnetic induction was discovered.

Power of induction

This discovery began to be used in industry, in transformers, various motors and generators.

However, this discovery really became popular and necessary only after 70 years. During the rise and development of the metallurgical industry, new, modern methods of melting metals were required in the conditions of metallurgical production. By the way, the first foundry, which used a vortex induction heater, was launched in 1927. The plant was located in the small English town of Sheffield.

And in the tail and in the mane

In the 80s, the principle of induction was already being applied in full. Engineers were able to create heaters that worked on the same principle of induction as a metallurgical furnace for melting metals. Such devices heated the workshops of factories. A little later, household appliances began to be produced. And some craftsmen did not buy them, but assembled induction heaters with their own hands.

Operating principle

If you disassemble an induction type boiler, then there you will find a core, electrical and thermal insulation, then a body. The difference between this heater and those used in industry is the toroidal winding with copper conductors. It is located between two pipes welded together. These pipes are made of ferromagnetic steel. The wall of such a pipe is more than 10 mm. As a result of this design, the heater has a much lower weight, higher efficiency, as well as small dimensions. A pipe with a winding works here as a core. And the other serves directly to heat the coolant.

The induction current, which is generated by a high-frequency magnetic field from the external winding to the pipe, heats the coolant. This process causes the walls to vibrate. Due to this, scale is not deposited on them.

Heating occurs due to the fact that the core is heated during operation. Its temperature rises due to eddy currents. The latter are formed due to the magnetic field, which, in turn, is generated by high voltage currents. This is how an induction water heater and many modern boilers work.

DIY induction power

Heating appliances that use electricity as energy are as convenient and comfortable to use as possible. They are much safer than gas powered equipment. In addition, in this case there is neither soot nor soot.

One of the disadvantages of such a heater is the high consumption of electricity. In order to somehow save money, craftsmen learned how to assemble induction heaters with their own hands. The result is an excellent device that requires much less electrical energy to operate.

Manufacturing process

To make such a device yourself, you do not need to have serious knowledge in electrical engineering, and anyone can handle the assembly of the structure.

To do this, we need a piece of thick-walled plastic pipe. It will work as the body of our unit. Next, you need a steel wire with a diameter of not more than 7 mm. Also, if you need to connect the heater to the heating in the house or apartment, it is advisable to purchase adapters. You also need a metal mesh that should hold the steel wire inside the case. Naturally, copper wire is needed to create an inductor. Also, almost everyone in the garage has a high-frequency inverter. Well, in the private sector, such equipment can be found without difficulty. Surprisingly, you can make induction heaters with your own hands from improvised means at no special cost.

First you need to carry out preparatory work for the wire. We cut it into pieces 5-6 cm long. The bottom of the part of the pipe must be closed with a net, and pieces of cut wire should be poured inside. From above, the pipe must also be closed with a net. It is necessary to pour so much wire to fill the pipe from top to bottom.

When the part is ready, you need to install it in the heating system. Then you can connect the coil to electricity through the inverter. It is believed that an induction heater from an inverter is a very simple and most budgetary device.

Do not test the apparatus if there is no water or antifreeze supply. You just melt the pipe. Before starting this system, it is advisable to make a ground for the inverter.

Modern heater

This is the second option. It involves the use of products of modern electronic devices. Such an induction heater, the diagram of which is presented below, does not need to be adjusted.

This circuit implies the principle of series resonance and can develop decent power. If you use more powerful diodes and larger capacitors, you can increase the performance of the unit to a serious level.

Assembling the vortex induction heater

In order to assemble this device, you need a choke. It can be found if you open the power supply of a regular computer. Next, you need to wind a wire made of ferromagnetic steel, copper wire 1.5 mm. Depending on the required parameters, it may take from 10 to 30 turns. Then you need to pick up field effect transistors. They are selected based on the maximum open junction resistance. As for the diodes, they need to be taken under a reverse voltage of at least 500 V, while the current will be somewhere around 3-4 A. You will also need zener diodes rated for 15-18 V. And their power should be about 2-3 Tue Resistors - up to 0.5 W.

Next, you need to assemble the circuit and make a coil. This is the basis on which the entire VIN induction heater is based. The coil will consist of 6-7 turns of 1.5 mm copper wire. Then the part must be included in the circuit and connected to electricity.

The device is able to heat the bolts to yellow. The circuit is extremely simple, however, the system generates a lot of heat in operation, so it is better to install radiators on transistors.

More complex design

In order to assemble this unit, you need to be able to work with welding, and a three-phase transformer is also useful. The design is presented in the form of two pipes that must be welded into each other. At the same time, they will play the role of a core and a heater. The winding is wound on the body. Thus, you can significantly increase productivity while achieving small overall dimensions and low weight.

To perform the supply and removal of the coolant, it is necessary to weld two pipes into the device body.

It is recommended that in order to eliminate possible heat losses as much as possible, as well as to protect yourself from possible current leaks, make insulation for the boiler. It will eliminate the occurrence of excessive noise, especially during intensive work.

It is desirable to use such systems in closed heating circuits in which there is a forced circulation of the coolant. It is allowed to use such units for plastic pipelines. The boiler must be installed in such a way that the distance between it and walls and other electrical appliances is at least 30 cm. It is also desirable to keep a distance of 80 cm from the floor and ceiling. It is also recommended to install a security system behind the outlet pipe. For this, a pressure gauge, an air release device, as well as a blast valve are suitable.

This is how easy and inexpensive you can assemble induction heaters with your own hands. This equipment may well serve you for many years and heat your home.

So, we found out how an induction heater is made with our own hands. The assembly scheme is not very complicated, so you can handle it in a matter of hours.

Content

Today, electricity is quite expensive for consumers, but heating devices operating on such a resource are quite popular among the population. Of great interest are devices operating on the principle of electromagnetic induction. The article describes how such a device works, where it is used, and how to make an induction heater with your own hands. But first, a little history.

Vortex induction heater

In the early nineteenth century, the English scientist Faraday was experimenting with the goal of converting magnetism into electrical energy. He managed to get a flow of energy in the primary winding, consisting of a wire wound on a core made of iron. Thus, electromagnetic induction was discovered. It happened in 1831.

The first foundry using a powerful induction water heater was opened in England in the thirties of the last century. In the 1980s, the principle of induction was applied more actively. Specialists have developed vortex heaters. They heated factory shops and various industrial premises. After some time, household appliances began to be produced.

The principle of operation of the inductor

Vortex heaters are commonly used for heating boilers. They are in great demand among the population due to their power and simple design. Their functioning is based on the transfer of magnetic field energy to the coolant. The water supplied to the apparatus is heated by the supply of energy. Then it is fed into the heating system. To create pressure, a pump is used. The water circulates and protects the elements from overheating. The coolant vibrates, which prevents the appearance of scale on the walls of the equipment.

If you examine the inside of an induction heater, you can find a metal case, insulation and core. The main difference between such a heater and industrial heaters is the winding with copper conductors. The latter is located between 2 welded steel pipes.

Principle of electromagnetic induction

Homemade induction heater is lightweight, has good efficiency and compact size. As a core, a pipe with a winding is used here. The second pipe is needed for heating. The current generated by the magnetic field heats the water. According to this principle, home-made devices and part of modern heaters function.

Heating device device

The device consists of such elements:

Plastic tube.
Stainless steel mesh.
Steel wire.
Copper wire.
Welding inverter.

One of the main advantages of this device is a simple design. The scheme of the induction heater is approximately as follows. In a round case is a coil - an inductor. Inside the latter is a piece of steel pipe with 2 branch pipes at the ends. They are needed to connect the device to the heating system. After connection, water will flow through the pipe. The pipe will get hot. From contact with it, the coolant is heated.

Scheme of the device of the induction heater

For other types of device, the coil is attached to the electrical network, but there is another connection scheme. It differs in a converter that increases the frequency of oscillations of the current supplied to the coil. This converter is called an inverter and consists of 3 modules:

Rectifier.
Inverter with 2 transistors.
Transistor control circuit.

The processes taking place in the device are similar to the operation of a transformer. The difference is in the secondary winding, which is short-circuited here and located inside the primary. Another difference is that in the case of a transformer, heating is a side effect, they try to avoid it.

An interesting fact: the maintenance of an induction heater will be much cheaper than if you use a gas boiler or boiler. The device consists of a minimum of parts that practically do not fail. There is nothing to break in the heater. The water is heated by an ordinary tube, which, unlike the same heating element, cannot burn out or deteriorate.

Scope of application

Today, the application of induction heating is used very often. Main Applications:

metal smelting, obtaining new alloys;
production of metal wire;
jewelry business;
production of heating boilers;
heat treatment of spare parts for vehicles;
medical industry (disinfection of instruments, medical equipment);
mechanical engineering, car service heating;
industrial ovens.

Disadvantages and advantages

Consider the positive characteristics and advantages of induction equipment:

Heating is produced in any environment.
Possibility of production of superpure alloys.
Rapid heating and melting of any material that conducts current.
Elements of the device are mounted outside, there are no inserts. This guarantees the elimination of leaks.
The induction water heater does not pollute the environment.
It is convenient when it is necessary to heat a certain area of the surface.
The contact area of the coolant with the heater surface is many times larger than in devices with tubular electric heaters. Due to this, the environment heats up very quickly.
Compact dimensions of the device.
The equipment is easily adjusted to the desired mode of operation and can be easily adjusted.
It is possible to manufacture a device of any shape (including independently). This prevents local heating and promotes even heat distribution.

Simple induction type heater

A flow heater of this type has practically no disadvantages when compared with devices operating on other principles. The only difficulty in operation is that it is necessary to match the inductor with the workpiece. Otherwise, the heating will be insufficient and low-power.

DIY manufacturing process

The following tools will be useful for work:

welding inverter;
welding generating current with a power of 15 amperes.

You will also need copper wire, which is wound around the core body. The device will act as an inductor. The wire contacts are connected to the inverter terminals so that no twists are formed. The piece of material needed to assemble the core must be the correct length. On average, the number of turns is 50, the diameter of the wire is 3 millimeters.

Copper wire of different diameters for winding

Now let's move on to the core. In his role will be a polymer pipe made of polyethylene. This type of plastic can withstand quite high temperatures. Core diameter - 50 millimeters, wall thickness - at least 3 mm. This part is used as a gauge on which a copper wire is wound, forming an inductor. Almost anyone can assemble the simplest induction water heater.

On the video you will see a way - how to independently organize induction heating of water for heating:

First option

The wire is cut into 50 mm segments, a plastic tube is filled with it. To prevent it from spilling out of the pipe, plug the ends with wire mesh. At the ends, adapters are placed from the pipe, in the place where the heater is connected.

A winding is wound on the body of the latter with copper wire. For this purpose, you need about 17 meters of wire: you need to make 90 turns, the pipe diameter is 60 millimeters. 3.14×60×90=17 m.

It is important to know! When checking the operation of the device, make sure that there is water (coolant) in it. Otherwise, the body of the device will quickly melt.

The pipe crashes into the pipeline. The heater is connected to the inverter. It remains to fill the device with water and turn it on. Everything is ready!

Second option

This option is much easier. A straight section of a meter size is selected on the vertical part of the pipe. It should be carefully cleaned of paint using sandpaper. Further, this section of the pipe is covered with three layers of electrical fabric. An induction coil is wound with copper wire. The entire connection system is well insulated. Now you can connect the welding inverter and the assembly process is complete.

Induction coil wrapped with copper wire

Before you start making a water heater with your own hands, it is advisable to familiarize yourself with the characteristics of factory products and study their drawings. This will help to understand the initial data of home-made equipment and avoid possible errors.

Third option

To make the heater in this more complicated way, you need to use welding. To work, you still need a three-phase transformer. Two pipes must be welded into each other, which will act as a heater and a core. A winding is wound onto the body of the inductor. This increases the performance of the device, which has a compact size, which is very convenient for its use at home.

Winding on the body of the inductor

For water supply and drainage, 2 branch pipes are welded into the body of the inductor. In order not to lose heat and prevent possible current leakage, insulation must be made. It will eliminate the problems described above, and completely eliminate the appearance of noise during the operation of the boiler.

Safety precautions must always be followed. Especially when they make something on their own. Here, heaters are used for systems with forced circulation. Heat energy is generated very quickly and overheating of the coolant can occur.

Don't forget the safety valve. It is attached to the heater. In the event that the circular pump stops working, the coolant will overheat completely. If the valve is not installed in advance, the system will break. The latter should, as a precaution, be equipped with a thermostat. If the heater is enclosed in a metal case, then it must be grounded.

Heater in a metal case

Since the home-made design does not have normal shielding, the inductor is installed at least 80 centimeters from horizontal surfaces. The distance to the wall is from 30 centimeters.

Tip: the power of homemade heaters can contribute to the spread of electromagnetic radiation. It is advisable to shield the device with galvanized steel and not install it in a residential area! There is an electromagnetic alternating field inside and outside the coil. It will heat all metal surfaces nearby.

So, without global financial expenses, it is easy to make this simple device with your own hands. The assembly scheme is simple, and almost everyone can handle the work of assembling the heater with their own hands. It does not require specialized technical knowledge. You can complete the job in just a few hours.

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