Three-phase voltage from single-phase in 5 minutes

I agree, did it before.

It seems to me that the author of the article, speaking about the simplicity of the technical solution he proposes, is a little disingenuous.
If you follow his recommendations, then to start a three-phase electric motor, you need another electric motor, and even more powerful! And this, according to the designer, is simple! In my opinion, this is called - at all costs!
Thank.
Peter.

a good idea before did

power losses will be, as well as phase imbalance, and the mat will rewind neighbors due to subsidence.

The idea is very interesting, but it is doubtful due to the technical illiteracy of the author who called the circuit breaker (automatic) bag. For information, these are completely different devices

Where does 380V come from between phase and N (220V)?

Something I did not understand .... For a more powerful motor, an even larger capacitance of capacitors is needed and it is also difficult to start it. What's the catch?

What to do, I have the same compressor with the same motor through the capacitors of a conventional network, it starts from 6 bar pressure. although the working pressure is 3 = 4 atm. maximally pumped 9 atm and at this pressure started.

It remains only to find line 220 which can withstand 7 kilowatts. It has long been come up with chastotniki.

Maybe this works, but the garbage is complete.

Illiterate scheme. The output will be not 380v between phases, but 220v.
In fact, these are two motors connected in parallel with one phase-shifting capacitor.
Engines in such cases switch from star to triangle.

Firstly, the consumer must be switched on by delta, since the removed line voltage is ~ 220 V.
Secondly, the ideal three-phase voltage will not work, in the opposite phases will not be 120 degrees.

How does the voltage increase from 220v to 380v?

Oil-oil, why such bells and whistles? Well, make the usual capacitor circuit.

If you measure the voltage on the machine, will it be exactly 380V?

It is not clear how 380 volts are obtained from 220 volts. What makes the voltage increase.

and instead of 3 kW load you get 8 kW. The counter will start to take off)
It’s easier and more profitable to choose the right capacitor. Or, if you need a powerful motor all the time, contact your network organization for a transfer to a three-phase voltage. They now have such an opportunity ...

Thanks to the author for the information as an option, I think it’s useful to know about it, but in practice the usual capacitor triggering circuits work no worse. Yes, 50% of the power is lost, but this shortcoming can be overcome or corrected mechanically, for example, a belt or other transmission, but imagine in your workshop a useless engine just to work the second engine, like that .... True, if from it make a fan unless.

380 is not there, a "three-phase" 220 is assumed. The circuit is better of course just a capacitor, but not by much. Nowadays, if you need a truly three-phase, it is better to take an inverter. Offers the sea! From 50-60 dollars for 0.75 kW.

why remember such a balcony in the age of frequency converters ...

For the scheme to the author a deuce. It can not 220 and 380 on the same wires at the same time.

The first engine in steady state does not consume 5.5 kW, but not more than 15% of this value since there is no load on the shaft. Energy losses only on magnetostriction and heating of the windings. It is unlikely that electronic circuits will have a higher efficiency. In addition, electronic converters have problems with the shape of a sinusoid.

I launched such a scheme before! And all who cluck about the form of the sine - have no idea about it

Take a chastotnik and do not suffer

Firstly.380V will not be output! Only 3x220. This is even visible from the diagram.
Secondly. These three phases will not be the same. Skew, anyway, will be, especially under load.
Well, and thirdly. Sculpting two engines in order to rotate one shaft with the modern development of electronics is an anarchy! To power a three-phase motor from a single-phase network, frequency converters should be used. Moreover, they can be bought cheaply from the Chinese on aliexpress. And no distortions and power losses. It is only necessary to connect the motor windings with a triangle. In addition, the rotation speed can also be adjusted.

380 will not be, but there will be only 220 in three-phase. And therefore, the electric motor must be connected with a triangle, not a star. And there should be two capacitors, connected in parallel, working and starting, disconnected after starting. The launcher should be twice as large as the working capacitor. The working capacitor is calculated by the formula: Cp = 2800 * I / U, where I is the current consumption, U is the rated voltage of the electric motor. For convenience and simplification of the selection, the following values ​​can be taken as a basis:

M = 0.4 kW Cp = 40 μF, Cn = 80 μF;
M = 0.8 kW Cf = 80 μF, Cn = 160 μF;
M = 1.1 kW Cf = 100 μF, Cn = 200 μF;
M = 1.5 kW Cf = 150 μF, Cn = 250 μF;
M = 2.2 kW Cp = 230 μF, Cn = 300 μF. Where M is the rated power of the electric motors used, Cp and Cn are the working and starting capacitors.

Electric machines and the theory of electric drive to help you ... With a reduced voltage, the electric motor will consume more current and start to warm up. The national fun is running on a rake. Everything has long been expressed in formulas, you see who needed personal experience.

With this scheme, you will not get 3 phases 380v. You will have 3 phases 220v. :-))))

Maybe I'm bending, but at the output of the circuit I see two phases and a neutral.

The capacitor (Capacitance) and inductance (winding of the 1st ed.) Will shift the phase by 120 degrees in different directions and as a result we will get 380 volts ... with one big minus ... all this economy (two electric motors will hang on ONE phase 220 volt network

Hmm, the scam is still one. When the capacitor is turned off, as shown in the video, the 3-phase motor will immediately stop and, if not turned off, will burn.
The author uses a 5.5 kW engine to connect a 4 kW engine, and that draws 7 kW from the network. Well, that is, it does not pull, because this is not possible, but offers to deceive physics.

The capacitance (capacitor) shifts the phase by 120 degrees in one direction, and the inductance (winding of the 1st ed) to the same 120 grams in the other direction. The output will be 380 volts BUT not everything is as simple as we would like. These are two electric motors in as a result, they will sit on phase 1 of a 220 volt network. As a result, we obtain phase overload-asymmetry ... up to a fire. Educated people will not connect a load of more than 8kW to a single-phase network

8 kW will not be, since the first engine is spinning at idle, and this is 5-10 percent of the nominal, there will also be no increase in voltage, the engine is connected in parallel. According to the counters, the 63 amp meter pulls 10 kW, if the input is made with a wire of the appropriate section, then everything is in order. By the phase shift of the capacitor, it is selected individually for the load. The voltage can be increased by a step-up transformer, in order to save on the power of the transformer, you need to turn it on according to the autotransformer circuit.

I have been using such a scheme for more than 30 years and it doesn’t work out badly. 5.5 kW asynchronous, 1500 rpm. In the star I start with a cord, and then I take 3 phases of 220V from it and feed asynchronous less power in the triangle. I am very pleased with this scheme, it does not give a voltage drawdown, since starting with a cord is very easy, and then a weak drawdown when connecting a load.

The only option is to get 3x380 / 220 V from 220 V
it is to connect them together in a motor-generator pair. The "Generator" will also have to be excited ...
Well, do not forget about the law of energy conservation - the power consumed from a single-phase network will be equal to the power generated by three-phase.

SOMETHING is complete nonsense. Put a capacitor between the phases and everything will work.

complete nonsense, this is an old scheme for raising the voltage in a phase network in remote areas of Siberia (electrician reference book somewhere 60s Godos)

You won’t win anything. The same losses. For a quality loss-free transition, you need a frequency converter to the appropriate power. And then indeed, the connection will take 5 to 10 minutes.

Never from 1 phase email. current does not get 3 phase current. This is utopia. 3 phase electric the current is obtained with the help of a synchronous generator (the rotor speed coincides with the rotation of the stator magnetic field) - having unscrewed the stator by some kind of drive, we get a linear 3-phase voltage of 380 volts. And with an asynchronous motor, the circuit that is drawn does not get a 3-phase voltage. This is the same phase. And where did you go to zero? When connected, phase - zero = 220 V

I remember that in 1974, we studied TOE (Theoretical Foundations of Electrical Engineering) and collected similar schemes in laboratory studies. At the same time, we studied currents, power (which was small), etc. There is nothing new in the publication.

Hello. Everything is great. But the question is, where does 380 volt appear in your circuit? I used this scheme about 15 years ago. And I got 3 phases of 220 volts.

I want to cry. Okay, the author, he confuses the terminology somewhere, but the article is an example of the fact that, if necessary, the trough will take off. And our man is capable of anything.
BUT who told you, gentlemen, that the chastotnik is capable of making three from one phase? You have been deceived. It is mean and disgusting. Or the instructions are not so translated. A device that makes one of three phases is correctly said to be an inverter. Now imagine how much the inverter will cost for a 2-quatt engine? And how much more will he eat? Is it necessary? Isn't it easier to buy a new motor in one phase?
Good luck, and confuse for less phase, otherwise people have household appliances in their homes burning.

Illiteracy is complete, but it’s okay. This was necessary in Soviet times, when it was impossible to get machines, single-phase pumps. It was only possible to steal at the enterprise, and there everything was three-phase. Now this good in bulk. Why all this fuss? Nobody canceled the law of conservation of energy, nothing happens out of nothing. 220 is the average value of a sinusoid, and its amplitude is 220x1.41 = 310V. This is the only thing that can be more than 300 volts in this circuit. We still need to imagine the volume of capacitors capable of starting a 5.5 kW engine, not the capacity, but the volume! They also need to be collected somewhere and placed somewhere. In short, it’s easier to buy a machine, it will be cheaper

The network is full of electronic phase splitters, as well as

220v voltage is applied. Ie. phase and zero. Zero the same phase is only grounded when connected by a star. How to convert this grounded phase (zero) by a shift into a phase with 380 v? Where does the land (zero) go? The second engine will really rotate, because it is connected according to the classical scheme with a capacitor and to the first one in parallel. But not about any 380 and there is no question. Power increase and do not wait, and consumption will increase accordingly.

I would call it a devil and a tail on the side. But there is a rational kernel. In this embodiment, the rotor from the first engine is not needed. So the stator will become a transformer. Then you can replace the stator with a low voltage transformer. With two windings of a thick wire, and a sufficient mass of iron. The windings must be connected to each other so that there would be no countercurrent. Two capacitors are needed. They must be connected from the middle terminal from one point to the extreme. And let's say 20MF capacitance, the output voltage will depend. There are practically no restrictions. You can raise up to several thousand volts. But if you look closely, it’s not difficult to understand that we got two chokes. And when starting the engine into an external network, a powerful voltage pulse will be squeezed out. Clearly, in the adjacent phase.And your neighbors can burn out not only light bulbs. And if you give a load on the engine, refrigerators can burn out. Now decide for yourself.

The implementation of the idea - “getting 3 phases from one” is not bad. In the years until the 97th, when 3 phases in private homes were a rarity, it was necessary to install such a powerful buffer engine. And even more so - there were no inverters in the post-Soviet space.
The phase shift was checked with a phase meter and the voltage shape with an oscilloscope. If the secondary motor at rated load consumes no more than 35% - 40% (the lower the better) of the nameplate power of the buffer (depends on the types of electric motors. AO or AOL, etc.), then the sinusoid is not bad and the shift in the region 120 degrees (It does not depend on the nameplate capacity of the secondary. Nameplate and power consumption are different concepts).
But anyway; when connecting the actuator to the buffer, you have to re-select the capacity of the phase-shifting capacitor. Because the total inductive resistance of the whole system as a whole changes and the complex resistance (impedance) changes. Moreover, when changing the mechanical load, all parameters change. And the angle between the phases and the shape of the voltage and the shape of the current (resistors of low resistance were installed in each phase and the probes of the oscilloscope were connected to them). At first glance, the phase angle in such a system "has no right to change." Since it is determined by the design of the prime mover. But the whole point is the capacitance of the capacitor - it is unchanged. Now, if it (capacity), depending on the shift, “itself” would adjust within tens of microfarads! But this is only a dream.
But what’s best this electromechanical system has is a large inertial component. And this is due to the built-in mechanical element - the flywheel. This is a massive rotor of a buffer electric motor. It reduces the starting current of the secondary electric motor at start-up (when the primary is accelerated) and smooths out instantaneous fluctuations in the phase shift and current consumption. This is an inertial electro-mechanical stabilizer.
The option was investigated when the passport “power is vice versa”. That is, the primary 1 kW., And the secondary 3 kW. Everything works perfectly and the inrush current when starting the secondary is accepted for household networks. Because by the time the secondary is launched, the primary has already been dispersed. But the power consumption of the secondary, of course, should be no more than 35% -40% of the primary. That is, the load moment must correspond to this value. But how to "by eye" at home determine this? But that is another question.
Therefore, of course, if there is a need for three-phase voltage, if there is a “free” electric motor with a power of 3-6 kW, and there is a place in the workshop or garage, then do not turn it in “copper” due to the inappropriateness of its use. He will still serve you not a small service. Moreover, the price of the inverter is many times higher than the price of the described method.
But I will draw your attention to another important factor in the question of the use of electric machines in general. These are short-circuited windings. The presence of at least one turn so badly worsens the parameters, the work that talking about acceptable results is not legitimate. Although the people enjoy! And it grinds, grinds, drills, grinds, cuts, cuts ... They even cook it by feeding home-made three-phase welding machines with diode rectifiers. And I saw it! So the question of short-circuited turns is more likely for fans to achieve the ideal. Apparently their number should not exceed a certain limit for specific types of electric motors. But how to determine short-circuited turns? This is a question of another topic.
By the way. Having bought an expensive inverter and connecting an email to it.a motor with squirrel cages, you run the risk of receiving a message on the inverter board - ERROR, DANGER, ANXIETY and more (depends on the imagination of the programmer who wrote the program for the inverter controller). Because even in the simplest (except for home-made) inverter there is a scheme for determining the imbalance of phase currents. This shemka, during the initialization of email. motor, forbids the inverter to supply a full pulse to its windings. And you will not see any rotation of the shaft.

All of these circuits with the start of a 3 phasic from a single-phase network are not quite operational either the engine does not gain momentum or rotates but terribly buzzes and heats up and at the same time loses significantly power. The best option for our day is a frequency converter, they are full in the electronics market of various types with it and the power is not lost and from a single-phase a normal 3-phase is made and the speed can be adjusted

Joke..
The electrician has died .. Grandmothers near the porch on the bench are wailing - oh, how young .. how much did he hit .. ??
From the crowd they answer - 380.

Instead of a powerful motor, I use a three-phase transformer, which does not allow phase imbalance. And does not load the network.