Converting Single-Phase to Three-Phase: Inverter, V-Belt Method & Possible Solutions

Hello.
Is it possible, for example, to make a three-phase inverter? I have a single-phase socket in the basement. I would like to connect three-phase. Is there a device that can do three phases from one?
I was thinking about connecting a single-phase motor and connecting it with a V-belt to a three-phase motor that would act as a generator. Will it work?

Of course it is possible.

The inverter will rectify the single-phase voltage and create a three-phase alternating voltage.
In the case of the motor, you can also use a capacitor that will generate a phase shift that is needed for operation.

There are also methods to shift phases with a transformer.

A three-phase motor will also work as a generator, but it will have worse efficiency.

It all depends on the application.

MiloszX12 wrote:

I would like to connect three-phase. Is there a device that can do three phases from one?

Yes, but you will still have 3x230V.

Strumien swiadomosci swia wrote:

Yes, but you will still have 3x230V.

So what the author needs.

pawelr98 wrote:

In the case of the motor, you can also use a capacitor that will generate a phase shift that is needed for operation.

Yes, but if he connects a 3KW motor in this way, how much will he get on the shaft?
You have to take into account a decrease in power.

Added after 2 [minutes]:

maurycy123 wrote:

Strumien swiadomosci swia wrote:

Yes, but you will still have 3x230V.

So what the author needs.

You have to learn a lot to express yourself on these types of topics.

The author would like to get 400V phase-to-phase. Just like in a normal network.

Rezystor240 wrote:

maurycy123 wrote:
Swia's Awareness Stream wrote:
Yes, but you will still have 3x230V.
So what the author needs.


You have to learn a lot to express yourself on these types of topics.

The author would like to get 400V phase-to-phase. Just like in a normal network.

My hands dropped. Do you know how 1F to 3F inverter works?

And it will be 3x230V.

A three-phase inverter looks like this.


Now my colleague will calculate what will happen if we have a 325V power supply (230V straightened) and the resistors are connected in a triangle.

The maximum voltage across the resistor will be 325V.
For PWM keying, the effective value will be just 230V.

If you want 3x400V, you need to add a transformer (or autotransformer) that will increase the voltage.
You can still combine it in this way that we give a transformer with a secondary 170V which we then put in series with the voltage of the network.

The choice is up to the designer.

There is also a two-way voltage multiplier from poverty.
This solution is cheaper (no transformer) but requires larger capacitors.

Diagram on the left, but no luck.

MiloszX12 wrote:

I have a single-phase socket in the basement. I would like to connect three-phase.

The function of "converting" 1-phase to 3f will be performed by the inverter, but the power you will be able to take from this 3-phase socket will be less than that allowed by the 1-phase socket (loss of inverter efficiency).
If your socket is "hanging" on the 10A protection, then the power of 2.3kW is to be "reworked", which will allow you to receive approx. 2kW.
But NOTE! If you want to use this inverter to power a motor that consumes more than 2kW at the start (induction motors can "jerk" even 10 times more than the nominal power), it will not be possible!

Rzuuf wrote:

But NOTE! If you want to use this inverter to power a motor that consumes more than 2kW at the start (induction motors can "jerk" even 10 times more than the nominal power), it will not be possible!

If the connection is made as it should be, i.e. the motor to the inverter terminals and switching from the panel or control terminals, then it can be started gradually from the lowest possible frequency.

First, what 3-phase do you want to connect?

A colleague wants to set up a three-phase socket, so implicitly connect such devices. No inverter can directly help here, especially since most of them cannot work without load. So it gets a bit complicated connection procedure. A socket is a socket, so that every conscious or unaware user can use it, safely for himself and the connected device. I propose to consider the possibility of routing the appropriate cable to a place where three-phase power is available. This is the cheapest option.

This "cheapest option" may not be that cheap, read on:
https://www.elektroda.pl/rtvforum/topic1959421.html.
Prices of inverters in the store start from around PLN 300 ...

kortyleski wrote:

A colleague wants to set up a three-phase socket, so implicitly connect such devices. No

Don't say anything to the author, maybe he only needs 400V, or maybe only 3x230V 50Hz.

I am still waiting for a response.

Maybe I will answer for the author who went to the Facebook group for advice. I'm in the same group.



So we have a power requirement of min. 500W.

But we are waiting for an answer regarding the requirement of 3x400 or 3x230.

I don't know if 230 or 400. I need a WS15 for the lathe, sharpener and drill

Do you have 3 phases at home at all? And you don't have a basement in the basement, or it's a basement in a block of flats.

MiloszX12 wrote:

I don't know if 230 or 400. I need a WS15 for the lathe, sharpener and drill

What is written on the nameplate of motors for a lathe, sharpener and drill?

I am transferring it to the amateurs section, because I am ashamed of reading.


Edit: And now I appeal to the moderators to analyze the granted pluses. Because I don't know what some people have them for

https://youtu.be/uGKZ51zg0X8

patryklo wrote:

https://youtu.be/uGKZ51zg0X8

It's like paying in Polish zlotys in Polish zlotys during the times of the People's Republic of Poland. Or grandfather about a pear and grandmother about parsley.

Although I found out how to weld a roll cabinet, make a hinged door, and fix an induction motor idling ...
That's good, too.

patryklo wrote:

https://youtu.be/uGKZ51zg0X8

I wonder what is the efficiency of such a system? And the quality of the 3 phases?

But what did this guy really do? Somehow I did not see the diagram ... for the price of the work and material costs, he would buy a motor and an inverter. Have you seen the vice? Made in england. They do everything differently ...

There is something more here 3 phase converter

I don't know too much what this movie is about. No diagram of any kind. Any explanation.

Only what I found out was how to weld a cabinet and how to make a motor mount.

It is worth remembering that when using an inverter, the rectified three-phase current is essentially a direct current with some ripple, whereas the rectified single-phase current is in fact a pulsating voltage, with the current drawn through the peak of the sine wave. This results in a very high inrush current, which further reduces the available power.

It may also be necessary to provide additional capacitance to the original converter.

It will be much better to use a modified active PFC to increase the voltage to around 500 V. The inverter can then operate directly from this and a maximum of 16 A can be drawn from a single-phase socket. Many server power supplies have PFC stages of 2 to 3 kW, which can be modified and fed into a simple motor inverter. Components are designed for 600 V, so in most cases you only need to replace electrolytic capacitors, for example - two in series and change the voltage feedback circuit. Many also have a built-in pre-charge relay.

Added after 6 [minutes]: .

Rzuuf wrote:

MiloszX12 wrote:

I have a single phase outlet in my basement. I would like to connect a 3-phase one.

The function of "converting" 1-phase to 3-phase will be fulfilled by the inverter, but the power you will be able to draw from this 3-phase socket will be less than that allowed by the 1-phase socket (loss on inverter efficiency).
If your socket "hangs" on 10A protection, there is 2.3kW of power to "convert", which will allow you to take about 2kW.
But ATTENTION: if from this inverter you want to power a motor that draws more power than 2kW at start-up (induction motors can "jerk" up to 10 times their nominal power) this will not be possible!

.

You are thinking of this 10x inrush, this is only valid for mains connected motors. The inverter has a controlled inrush. It "gently starts" the motor.

Moderated By krzysiek7:

3.1.19. Publish entries in archive discussions. Archived discussions are defined as discussions marked by the Service Provider as: Archive Topic or Archive Thread.

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cdtdsilva wrote:

It's worth remembering,

It's also worth looking at post dates and not digging up archives.