Homemade asynchronous generator. Asynchronous generator - basic elements, principle of operation and calculation of basic parameters. Instructions on how to remake from the engine with your own hands! Do-it-yourself single-phase alternator

Electric generators are an additional source of energy for the home. In the case of a large distance from the main electrical networks, it may well replace them. Frequent power outages force the installation of alternators.

They are not cheap, is there any point in spending more than 10,000 tr. for the device, if you can make a generator from an electric motor yourself? Of course, some electrical engineering skills and tools will come in handy for this. The main thing is not to spend money.

You can assemble a simple generator with your own hands, it will be relevant if you need to cover a temporary shortage of electricity. For more serious cases, it is not suitable, as it does not have sufficient functionality and reliability.

Naturally, there are many difficulties in the manual assembly process. Required parts and tools may not be available. Lack of experience and skills in such work can be intimidating. But a strong desire will be the main stimulus, and will help to overcome all laborious procedures.

The implementation of the generator and the principle of its operation

Due to electromagnetic induction, an electric current is generated in the generator. This is because the winding moves in an artificially created magnetic field. This is the principle of operation of an electric generator.

The movement of the generator gives the internal combustion engine of low power. It can run on petrol, gas or diesel fuel.

The generator has a rotor and a stator. The magnetic field is created using a rotor. Magnets are attached to it. The stator is the fixed part of the generator and consists of special steel plates and a coil. There is a small gap between the rotor and the stator.

There are two types of generator. The first has a synchronous rotation of the rotor. It has a complex design, and low efficiency. In the second type, the rotor rotates asynchronously. According to the principle of action - it is simple.

Asynchronous motors lose a minimum of energy, while in synchronous generators, the loss rate reaches 11%. Therefore, electric motors with asynchronous rotation of the rotor are very popular in household appliances, and in various factories.

During operation, voltage drops may occur, they have a detrimental effect on household appliances. To do this, there is a rectifier at the output ends.

The asynchronous generator is easy to maintain. Its body is reliable and sealed. You can not be afraid for household appliances that have an ohmic load and are sensitive to voltage drops. High efficiency, and a long period of operation, make the device in demand, moreover, it can be assembled independently.

What do you need to build a generator? First, you need to choose a suitable electric motor. It can be taken from the washing machine. You should not make a stator yourself, it is better to use a ready-made solution where there are windings.

It is worth immediately stocking up with a sufficient amount of copper wires, and insulating materials. Since any generator will produce power surges, you will need a rectifier.

According to the instructions for the generator with your own hands, you need to make a power calculation. In order for the future device to produce the necessary power, it needs to be given a number of revolutions a little more than the rated power.

Let's use a tachometer and turn on the engine in the network, so you can find out the speed of rotation of the rotor. To the obtained value, you need to add 10%, this will prevent the engine from overheating.

Capacitors will help maintain the required voltage level. They are selected depending on the generator. For example, for a power of 2 kW, a capacitance of 60 microfarads is required. You need 3 such parts with the same capacity. To make the device safe, it must be grounded.

Assembly process

Everything is simple here! Capacitors are connected to the electric motor according to the "triangle" scheme. During operation, periodically check the temperature of the case. Its heating may occur due to improperly selected capacitor capacities.

A homemade generator that does not have automatics must be constantly monitored. The heating that occurs over time will reduce efficiency. Then the device needs to be given time to cool down. From time to time, voltage, speed, and current should be measured.

Incorrectly calculated characteristics are not able to give the equipment the necessary power. Therefore, before starting the assembly, you should carry out drawing work, and stock up on diagrams.

It is possible that a homemade device will be accompanied by frequent breakdowns. You should not be surprised at this, since it is almost impossible to achieve a hermetic installation of all elements of an electric generator at home.

So, now I hope it is clear how to make a generator from an electric motor. If there is a desire to design an apparatus, the power of which should be enough for the simultaneous operation of household appliances and lighting lamps, or a construction tool, then you need to add up their power and select the desired engine. It is desirable that it be with a small margin of power.

If the manual assembly of the generator failed, do not despair. There are many modern models on the market that do not need constant supervision. They can be of various capacities, and quite economical. There are photos of generators on the Internet, they will help to estimate the dimensions of the device. The only downside is their high cost.

DIY photo generators

Local power grids are not always able to fully provide electricity to houses, especially when it comes to country cottages and mansions. Interruptions in a constant power supply or its complete absence makes it necessary to look for electricity. One of these is the use - a device capable of converting and storing electricity, using for this the most unusual resources (energy, tides). Its principle of operation is quite simple, which makes it possible to make an electric generator with your own hands. A homemade model may not be able to compete with a factory assembled counterpart, but this is a great way to save more than 10,000 rubles. If we consider a homemade power generator as a temporary alternative source of power supply, then it is quite possible to get by with a homemade one.

How to make an electric generator, what is required for this, as well as what nuances will have to be taken into account, we will learn further.

The desire to have an electric generator in its use is overshadowed by one nuisance - this is high unit cost. Like it or not, but the most low-power models have a rather exorbitant cost - from 15,000 rubles and more. It is this fact that suggests the idea of creating a generator with his own hands. However, himself the process can be difficult, if:

no skill in working with tools and diagrams;
no experience in creating such devices;
The necessary parts and spare parts are not available.

If all this and a great desire are present, then you can try to build a generator, guided by the assembly instructions and the attached diagram.

It's no secret that a purchased power generator will have a more extended list of features and functions, while a home-made product is capable of failing and failing at the most inopportune moments. Therefore, to buy or do it yourself is a purely individual matter that requires a responsible approach.

How an electric generator works

The principle of operation of the electric generator is based on the physical phenomenon of electromagnetic induction. A conductor passing through an artificially created electromagnetic field creates an impulse that is converted into direct current.

The generator has an engine that is capable of generating electricity by burning a certain type of fuel in its compartments:, or. In turn, the fuel, entering the combustion chamber, during the combustion process produces a gas that rotates the crankshaft. The latter transmits an impulse to the driven shaft, which is already capable of providing a certain amount of energy at the output.

A power source is needed to power household appliances and industrial equipment. There are several ways to generate electricity. But the most promising and cost-effective, today, is the generation of current by electric machines. The simplest to manufacture, cheap and reliable in operation turned out to be an asynchronous generator that generates the lion's share of the electricity we consume.

The use of electric machines of this type is dictated by their advantages. Asynchronous power generators, unlike, provide:

a higher degree of reliability;
long service life;
profitability;
minimum maintenance costs.

These and other properties of asynchronous generators are inherent in their design.

Device and principle of operation

The main working parts of an asynchronous generator are the rotor (moving part) and the stator (stationary). In Figure 1, the rotor is on the right and the stator is on the left. Pay attention to the rotor device. It does not show windings of copper wire. In fact, windings exist, but they consist of aluminum rods short-circuited into rings located on both sides. In the photo, the rods are visible in the form of oblique lines.

The design of short-circuited windings forms the so-called "squirrel cage". The space inside this cage is filled with steel plates. To be precise, aluminum rods are pressed into grooves made in the rotor core.

Rice. 1. Rotor and stator of an asynchronous generator

The asynchronous machine, the device of which is described above, is called a squirrel-cage generator. Anyone who is familiar with the design of an asynchronous electric motor must have noticed the similarity in the structure of these two machines. In fact, they are no different, since the induction generator and the squirrel-cage motor are almost identical, with the exception of additional excitation capacitors used in generator mode.

The rotor is located on a shaft, which sits on bearings clamped on both sides by covers. The whole structure is protected by a metal case. Generators of medium and high power require cooling, so a fan is additionally installed on the shaft, and the case itself is made ribbed (see Fig. 2).

Rice. 2. Asynchronous generator assembly

Operating principle

By definition, a generator is a device that converts mechanical energy into electrical current. It does not matter what energy is used to rotate the rotor: wind, potential energy of water or internal energy converted by a turbine or internal combustion engine into mechanical energy.

As a result of the rotation of the rotor, the magnetic lines of force formed by the residual magnetization of the steel plates cross the stator windings. EMF is formed in the coils, which, when active loads are connected, leads to the formation of current in their circuits.

At the same time, it is important that the synchronous speed of rotation of the shaft slightly (by about 2 - 10%) exceeds the synchronous frequency of the alternating current (set by the number of stator poles). In other words, it is necessary to ensure the asynchrony (mismatch) of the rotational speed by the amount of rotor slip.

It should be noted that the current thus obtained will be small. To increase the output power, it is necessary to increase the magnetic induction. They achieve an increase in the efficiency of the device by connecting capacitors to the terminals of the stator coils.

Figure 3 shows a diagram of a welding asynchronous alternator with capacitor excitation (left side of the diagram). Please note that the excitation capacitors are connected in delta. The right side of the figure is the actual diagram of the inverter welding machine itself.

Rice. 3. Scheme of welding asynchronous generator

There are other, more complex excitation schemes, for example, using inductors and a capacitor bank. An example of such a circuit is shown in Figure 4.

Figure 4. Diagram of a device with inductors

Difference from synchronous generator

The main difference between a synchronous alternator and an asynchronous generator is in the design of the rotor. In a synchronous machine, the rotor consists of wire windings. To create magnetic induction, an autonomous power source is used (often an additional low-power DC generator located on the same axis as the rotor).

The advantage of a synchronous generator is that it generates a higher quality current and is easily synchronized with other alternators of this type. However, synchronous alternators are more sensitive to overloads and short circuits. They are more expensive than their asynchronous counterparts and more demanding to maintain - you need to monitor the condition of the brushes.

The harmonic distortion or clear factor of induction generators is lower than that of synchronous alternators. That is, they generate almost clean electricity. On such currents they work more stable:

adjustable chargers;
modern television receivers.

Asynchronous generators provide reliable start of electric motors that require high starting currents. According to this indicator, they are, in fact, not inferior to synchronous machines. They have less reactive loads, which has a positive effect on the thermal regime, since less energy is spent on reactive power. The asynchronous alternator has better output frequency stability at different rotor speeds.

Classification

Squirrel-cage generators are most widely used due to the simplicity of their design. However, there are other types of asynchronous machines: alternators with a phase rotor and devices using permanent magnets that form an excitation circuit.

In Figure 5, for comparison, two types of generators are shown: on the left, on the base, and on the right, an asynchronous machine based on IM with a phase rotor. Even a cursory glance at the schematic images shows the complicated design of the phase rotor. Attention is drawn to the presence of slip rings (4) and the brush holder mechanism (5). The number 3 indicates the grooves for the wire winding, to which it is necessary to apply current to excite it.

Rice. 5. Types of asynchronous generators

The presence of excitation windings in the rotor of an asynchronous generator improves the quality of the generated electric current, but at the same time such advantages as simplicity and reliability are lost. Therefore, such devices are used as an autonomous power source only in those areas where it is difficult to do without them. Permanent magnets in rotors are used mainly for the production of low-power generators.

Application area

The most common use of generator sets with a squirrel-cage rotor. They are inexpensive and require virtually no maintenance. Devices equipped with starting capacitors have decent efficiency indicators.

Asynchronous alternators are often used as an independent or backup power source. They work with them, they are used for powerful mobile and.

Alternators with a three-phase winding confidently start a three-phase electric motor, therefore they are often used in industrial power plants. They can also power equipment in single-phase networks. The two-phase mode allows you to save ICE fuel, since the unused windings are in idle mode.

The scope of application is quite extensive:

transport industry;
Agriculture;
domestic sphere;
medical institutions;

Asynchronous alternators are convenient for the construction of local wind and hydraulic power plants.

DIY asynchronous generator

Let's make a reservation right away: we are not talking about making a generator from scratch, but about converting an asynchronous motor into an alternator. Some craftsmen use a ready-made stator from a motor and experiment with a rotor. The idea is to use neodymium magnets to make the rotor poles. A blank with glued magnets may look something like this (see Fig. 6):

Rice. 6. Blank with glued magnets

You stick magnets on a specially machined workpiece, planted on the motor shaft, observing their polarity and shift angle. This will require at least 128 magnets.

The finished structure must be adjusted to the stator and at the same time ensure a minimum gap between the teeth and the magnetic poles of the manufactured rotor. Since the magnets are flat, they will have to be ground or turned, while constantly cooling the structure, since neodymium loses its magnetic properties at high temperatures. If you do everything right, the generator will work.

The problem is that in artisanal conditions it is very difficult to make an ideal rotor. But if you have a lathe and are willing to spend a few weeks tweaking and tweaking, you can experiment.

I propose a more practical option - turning an induction motor into a generator (see the video below). To do this, you need an electric motor with suitable power and an acceptable rotor speed. Engine power must be at least 50% higher than the required alternator power. If such an electric motor is at your disposal, proceed to processing. Otherwise, it is better to buy a ready-made generator.

For processing, you will need 3 capacitors of the brand KBG-MN, MBGO, MBGT (you can take other brands, but not electrolytic). Select capacitors for a voltage of at least 600 V (for a three-phase motor). The reactive power of the generator Q is related to the capacitance of the capacitor by the following relationship: Q = 0.314·U 2 ·C·10 -6 .

With an increase in load, reactive power increases, which means that in order to maintain a stable voltage U, it is necessary to increase the capacitance of the capacitors by adding new capacitances by switching.

Video: making an asynchronous generator from a single-phase motor - Part 1

Part 2

In practice, the average value is usually chosen, assuming that the load will not be maximum.

Having selected the parameters of the capacitors, connect them to the terminals of the stator windings as shown in the diagram (Fig. 7). The generator is ready.

Rice. 7. Capacitor connection diagram

Asynchronous generator does not require special care. Its maintenance consists in monitoring the condition of the bearings. At nominal modes, the device is able to work for years without operator intervention.

The weak link is the capacitors. They can fail, especially when their ratings are incorrectly selected.

The generator heats up during operation. If you often connect high loads, monitor the temperature of the device or take care of additional cooling.

For the needs of building a private residential building or a summer house, a home master may need an autonomous source of electrical energy, which can be bought in a store or assembled with your own hands from available parts.

Homemade generator is able to run on the energy of gasoline, gas or diesel fuel. To do this, it must be connected to the engine through a shock-absorbing clutch that ensures smooth rotation of the rotor.

If local environmental conditions allow, for example, frequent winds blow or a source of running water is nearby, then you can create a wind or hydraulic turbine and connect it to an asynchronous three-phase motor to generate electricity.

Due to such a device, you will have a constantly working alternative source of electricity. It will reduce energy consumption from public networks and allow savings on its payment.

In some cases, it is permissible to use a single-phase voltage to rotate an electric motor and transmit torque to a home-made generator to create its own three-phase symmetrical network.

How to choose an asynchronous motor for a generator by design and characteristics

Technological features

The basis of a homemade generator is a three-phase asynchronous electric motor with:

phase;
or squirrel-cage rotor.

Stator device

The magnetic circuits of the stator and rotor are made of insulated plates of electrical steel, in which grooves are created to accommodate the winding wires.

The three individual stator windings can be wired in the factory as follows:

stars;
or a triangle.

Their conclusions are connected inside the terminal box and connected by jumpers. The power cable is also installed here.

In some cases, wires and cables can be connected in other ways.

Symmetrical voltages are supplied to each phase of the induction motor, shifted in angle by a third of the circle. They form currents in the windings.

These quantities are conveniently expressed in vector form.

Design features of the rotors

Wound rotor motors

They are provided with a winding modeled on the stator, and the leads from each are connected to slip rings, which provide electrical contact with the start-up and adjustment circuit through pressure brushes.

This design is quite difficult to manufacture, expensive in cost. It requires periodic monitoring of work and qualified maintenance. For these reasons, it makes no sense to use it in this design for a home-made generator.

However, if there is a similar motor and it has no other application, then the conclusions of each winding (those ends that are connected to the rings) can be shorted to each other. In this way, the phase rotor will turn into a short-circuited one. It can be connected according to any scheme considered below.

Squirrel cage motors

Aluminum is poured inside the grooves of the rotor magnetic circuit. The winding is made in the form of a rotating squirrel cage (for which it received such an additional name) with jumper rings short-circuited at the ends.

This is the simplest motor circuit, which is devoid of moving contacts. Due to this, it works for a long time without the intervention of electricians, it is characterized by increased reliability. It is recommended to use it to create a homemade generator.

Designations on the motor housing

In order for a homemade generator to work reliably, you need to pay attention to:

, which characterizes the quality of protection of the body from the effects of the external environment;
power consumption;
speed;
winding connection diagram;
permissible load currents;
Efficiency and cosine φ.

The principle of operation of an induction motor as a generator

Its implementation is based on the method of electric machine reversibility. If the motor is disconnected from the mains voltage, the rotor is forced to rotate at the calculated speed, then EMF will be induced in the stator winding due to the presence of residual energy of the magnetic field.

It remains only to connect a capacitor bank of the appropriate rating to the windings and a capacitive leading current will flow through them, which has the character of a magnetizing one.

In order for the generator to self-excite, and a symmetrical system of three-phase voltages to form on the windings, it is necessary to select the capacitance of the capacitors, which is greater than a certain, critical value. In addition to its value, the design of the engine naturally affects the output power.

For the normal generation of three-phase energy with a frequency of 50 Hz, it is necessary to maintain the rotor speed exceeding the asynchronous component by the amount of slip S, which lies within S=2÷10%. It needs to be kept at the synchronous frequency level.

The deviation of the sinusoid from the standard frequency value will adversely affect the operation of equipment with electric motors: saws, planers, various machine tools and transformers. This has practically no effect on resistive loads with heating elements and incandescent lamps.

Wiring diagrams

In practice, all common methods of connecting the stator windings of an induction motor are used. Choosing one of them creates different conditions for the operation of the equipment and generates a voltage of certain values.

Star schemes

A popular option for connecting capacitors

The connection diagram of an asynchronous motor with star-connected windings for operation as a three-phase network generator has a standard form.

Scheme of an asynchronous generator with connection of capacitors to two windings

This option is quite popular. It allows you to power three groups of consumers from two windings:

two voltage 220 volts;
one - 380.

The working and starting capacitors are connected to the circuit by separate switches.

Based on the same circuit, you can create a home-made generator with capacitors connected to one winding of an induction motor.

triangle diagram

When assembling the stator windings according to the star circuit, the generator will produce a three-phase voltage of 380 volts. If you switch them to a triangle, then - 220.

The three schemes shown above in the pictures are basic, but not the only ones. Based on them, other connection methods can be created.

How to calculate the characteristics of the generator by engine power and capacitor capacitance

To create normal operating conditions for an electric machine, it is necessary to observe the equality of its rated voltage and power in the generator and electric motor modes.

For this purpose, the capacitance of the capacitors is selected taking into account the reactive power Q generated by them at various loads. Its value is calculated by the expression:

Q=2π∙f∙C∙U 2

From this formula, knowing the power of the engine, to ensure full load, you can calculate the capacity of the capacitor bank:

C \u003d Q / 2π ∙ f ∙ U 2

However, the mode of operation of the generator should be taken into account. At idle, the capacitors will unnecessarily load the windings and heat them up. This leads to large energy losses, overheating of the structure.

To eliminate this phenomenon, capacitors are connected in steps, determining their number depending on the applied load. To simplify the selection of capacitors for starting an asynchronous motor in generator mode, a special table has been created.

Generator power (kVA)	Full load mode				Idle mode
	cos φ=0.8		cos φ=1		Q (kvar)	C (uF)
	Q (kvar)	C (uF)	Q (kvar)	C (uF)	Q (kvar)	C (uF)
15	15,5	342	7,8	172	5,44	120
10	11,1	245	5,9	130	4,18	92
7	8,25	182	4,44	98	3,36	74
5	6,25	138	3,4	75	2,72	60
3,5	4,53	100	2,54	56	2,04	45
2	2,72	60	1,63	36	1,27	28

Starting capacitors of the K78-17 series and the like with an operating voltage of 400 volts or more are well suited for use as part of a capacitive battery. It is quite acceptable to replace them with metal-paper counterparts with the corresponding denominations. They will have to be connected in parallel.

It is not worth using models of electrolytic capacitors to work in the circuits of an asynchronous home-made generator. They are designed for DC circuits, and when passing a sinusoid that changes in direction, they quickly fail.

There is a special scheme for connecting them for such purposes, when each half-wave is directed by diodes to its assembly. But it's pretty complicated.

Design

The autonomous device of the power plant must fully provide the operating equipment and be carried out by a single module, including a hinged electrical panel with devices:

measurements - with a voltmeter up to 500 volts and a frequency meter;
switching loads - three switches (one general supplies voltage from the generator to the consumer circuit, and the other two connect capacitors);
protection - eliminating the consequences of short circuits or overloads and), saving workers from insulation breakdown and phase potential entering the case.

Main power redundancy

When creating a home-made generator, it is necessary to provide for its compatibility with the grounding circuit of the working equipment, and for autonomous operation, it must be securely connected to.

If the power plant is created for backup power supply of devices operating from the state network, then it should be used when the voltage is turned off from the line, and when it is restored, it should be stopped. To this end, it is enough to install a switch that controls all phases simultaneously or connect a complex automatic system for switching on backup power.

Voltage selection

The 380 volt circuit has an increased risk of human injury. It is used in extreme cases, when it is not possible to get by with a phase value of 220.

Generator overload

Such modes create excessive heating of the windings with subsequent destruction of the insulation. They occur when the currents passing through the windings are exceeded due to:

improper selection of capacitor capacitance;
connection of high power consumers.

In the first case, it is necessary to carefully monitor the thermal regime during idling. With excessive heating, it is necessary to adjust the capacitance of the capacitors.

Features of connecting consumers

The total power of a three-phase generator consists of three parts generated in each phase, which is 1/3 of the total. The current passing through one winding must not exceed the rated value. This must be taken into account when connecting consumers, distribute them evenly over the phases.

When a homemade generator is designed to operate on two phases, it cannot safely generate electricity more than 2/3 of the total value, and if only one phase is involved, then only 1/3.

Frequency control

The frequency meter allows you to monitor this indicator. When it was not installed in the design of a home-made generator, then you can use the indirect method: at idle, the output voltage exceeds the nominal 380/220 by 4 ÷ 6% at a frequency of 50 Hz.

One of the options for making a home-made generator from an asynchronous motor and its capabilities are shown in their video by the owners of the Maria channel with Alexander Kostenko.

(13 votes, average: 4.5 out of 5)

An asynchronous (induction) generator is an electrical product that runs on alternating current and has the ability to reproduce electrical energy. A distinctive feature is the high frequency of rotation of the rotor.

This parameter is much higher than that of the synchronous counterpart. The operation of an asynchronous machine is based on its ability to convert mechanical energy into electrical energy. Permissible voltage - 220V or 380V.

Areas of use

Today, the scope of asynchronous devices is quite wide. They are used:

in the transport industry (braking system);
in agricultural work (aggregates that do not require power compensation);
in everyday life (motors of autonomous water or wind power plants);
for welding work;
to ensure uninterrupted power supply to the most important equipment, such as medical refrigerators.

In theory, it is quite acceptable to convert an asynchronous motor into an asynchronous type generator. To do this, you need:

have a clear understanding of the electric current;
carefully study the physics of obtaining electricity from mechanical energy;
provide the required conditions for the occurrence of current in the stator winding.

Device specifics and principle of operation

The main elements of the device of asynchronous generators are the rotor and the stator. The rotor is a short-circuited part, during the rotation of which an electromotive force is generated. Aluminum is used to make conductive surfaces. The stator is equipped with a three-phase or single-phase winding arranged in a star shape.

As shown in the photo of the asynchronous type generator, the other components are:

cable entry (electric current is output through it);
temperature sensor (needed to track the heating of the winding);
flanges (appointment - a tighter connection of elements);
slip rings (not connected to each other);
regulating brushes (they run a rheostat that allows you to adjust the rotor resistance);
short-circuiting device (used if it is necessary to stop the rheostat forcibly).

The principle of operation of asynchronous generators is based on the processing of mechanical energy into electrical energy. The movement of the rotor blades leads to the appearance of an electric current on its surface.

As a result, a magnetic field is formed, inducing a single- and three-phase voltage on the stator. It is possible to regulate the generated energy by changing the load on the stator windings.

Circuit Features

The generator circuit from an induction motor is quite simple. It does not require special skills. When you start development without connecting to the mains, rotation will begin. Having reached the appropriate frequency, the stator winding will begin to generate current.

If you install a separate battery of several capacitors, then the result of such manipulation will be a leading capacitive current.

The parameters of the generated energy are influenced by the technical characteristics of the generator and the capacitance of the capacitors used.

Types of asynchronous motors

It is customary to distinguish the following types of asynchronous generators:

With squirrel-cage rotor. A device of this type consists of a stationary stator and a rotating rotor. The cores are steel. An insulated wire is placed in the grooves of the stator core. A rod winding is installed in the grooves of the rotor core. The rotor winding is closed by special jumper rings.

With phase rotor. Such a product has a rather high cost. Requires specialized service. The design is similar to that of a generator with a squirrel-cage rotor. The difference lies in the use of insulated wire as windings.

The ends of the winding are attached to special rings placed on the shaft. Brushes pass through them, connecting the wire with the rheostat. An asynchronous type generator with a phase rotor is less reliable.

Converting an engine to a generator

As mentioned earlier, it is permissible to use an induction motor as a generator. Consider a small master class.

You will need an engine from a conventional washing machine.

Let's make the thickness of the core smaller and make a few non-through holes.
We cut out a strip from sheet steel, the size of which is equal to the size of the rotor.
Let's take care of the installation of neodymium magnets (at least 8 pcs.). We fix them with glue.
We close the rotor with a sheet of thick paper and fix the edges with adhesive tape.
We will smear the rotor end with a mastic composition in order to seal.
Fill the free space between the magnets with resin.
After the epoxy hardens, remove the paper layer.
Sand the rotor with sandpaper.
Using two wires, we connect the device to the working winding, remove unnecessary conductors.
If desired, replace the bearings.