Converting a 5.5kW, 1455 RPM 3-Phase Motor to Generator: Capacitors, Voltage Regulator, 220V Output

Hello!
I would like to convert a 5.5Kw, 1455 rpm three-phase motor into a generator. Can you make a generator out of it? I read somewhere that you can connect 3 capacitors on the phases, I tried to connect a 12V and 220v bulb and rotated but none of it shone, I connected without capacitors because I do not know if it is for sure and I am writing for help. I will drive the generator with an internal combustion engine, I want to get 220v and I will buy a voltage regulator and is it enough? Could someone easily describe how to connect / convert it ?? Regards.

I saw a video on YT how a guy straight from the engine connected the voltage regulator and connected the light bulb and turned and shone here is the link:
http://www.youtube.com/watch?v=o8WZvF_2eks
and I just have a similar engine as it is in the video, only 5.5 kW and I would like to convert it into a generator, but when I connect directly, for example, a light bulb to the engine and turn it, it does not light and I do not know what to convert to make it work. Greetings

Hello. As far as I know, the three-phase motor is AC voltage. It doesn't have a permanent magnet, so you can't do a generator on it. And there is definitely a converted engine in the video.

someone just wrote that it is enough to connect 3 40uF 400v capacitors on the phases and swing it to a higher speed than it has on the rating plate and then it produces a normal current like a generator.

Hello
The matter is simpler than you are discussing here, please check the engine characteristics.
In fact, it is enough to drive it and connect it to the mains, it will switch to the generator itself, of course, please remember about the security features.
George

Added after 2 [minutes]:

But if you want to make a separate (separate) layout, please forget it.

pjetrekk15 wrote:

someone just wrote that it is enough to connect 3 40uF 400v capacitors on the phases and swing it to a higher speed than it has on the rating plate and then it produces a normal current like a generator.

He wrote well, but he did not write down what happens with the frequency and voltage when the load changes. And in general, how do you have associated windings in the motor, because I suspect in a triangle.

what happens with the frequency and voltage when the load changes? I don't know what, how can i check it?

And what do you want with a power supply?

for now, I have just such an idea to make such an aggregate because sometimes it is useful somewhere when there is no access to the network.

You have not written anywhere about what the motor excitation is. You cannot make a generator of a 3-phase induction motor, because there is no need to create a magnetic flux (excitation) that would cut the constant winding, which would generate voltage.

Added after 8 [minutes]:

There must be excitation to create a generator. This is the voltage that produces a constant magnetic flux in the rotor winding. And this rotor, while spinning, causes the magnetic flux to cut the stator winding in which, under this influence, a voltage is induced with an energy proportional to the energy put into the motion of the system and the excitation energy (this is the theory in short)

The pessimists themselves.
Of course you can make a generator out of an engine.
We take out the rotor and to the milling mill, there we cut the grooves for neodymium magnets.
The magnets are glued in, the whole is ground and the rotor is returned to its place.
And then it's simple, a 3-phase rectifier, a DC converter for anything and it's ready.

I was doing something like that a long time ago as my graduate work in college.
To make it more interesting, we have added a boost to get the appropriate voltage in the entire range of loads.
We got 3x220V 45-55Hz without any problems.

Regards

So you will have to convert? And after conversion what will be the power of this generator? now the engine has 5.5kw, it is the same engine as it is said in the countryside, from the circular or hay press, a belt is put on it and it is driven by the circular and it drives, now it is unnecessary and I just want to use it for a generator, as I mentioned before, I connected it to He has a bulb for 12V and 220V and I turned the drill but nothing, I also have a washing machine motor, I also connected the bulb to 220V and nothing, and the bulb for 12V at low speed did not light up and on larger ones it only flashed and burned out that is, I have to understand that there is no other way to make this 5.5kw motor on a generator some easier way, apart from the above?

Any async can be a generator, just take a look at the meaning. You have to "catch" such an engine above zero skid and you already have a generator. The frequency is constant because the network is stiff. And the shafts are for reactive power.
As Jerzy Bartnicki wrote, it is impossible to give electricity by itself, you can also convert the engine according to Marek-Pe - you will have a great alternator.

Well, I mean that I have an internal combustion engine and it would drive this 5.5kw engine, such a combustion unit, I do not want these cheap Chinese from supermarkets and then there is satisfaction with doing it yourself The only thing I mean is if I accelerate this 5.5kw engine in this combustion engine to high revs, will it generate electricity and then connect a voltage regulator to it and can I connect, for example, a grinder to it? it will not do without reworking as Marek_Pe wrote

pjetrekk15 wrote:

Well, I mean that I have an internal combustion engine and it would drive this 5.5kw engine, such a combustion unit, I do not want these cheap Chinese from supermarkets and then there is satisfaction with doing it yourself The only thing I mean is if I accelerate this 5.5kw engine in this combustion engine to high revs, will it generate electricity and then connect a voltage regulator to it and can I connect, for example, a grinder to it? it will not do without reworking as Marek_Pe wrote

First of all, you need to accelerate the engine above the synchronous speed, i.e. - if the rating plate says 2940 rpm, then to create a generator you need to accelerate it over 3000 rpm, if 1450 you accelerate over 1500 rpm.

But - even if you had a 500 kW engine and could propel it to create a generator, you would not "get" free energy anyway. You just "pump" it into the network. The most you can do is make a deal with the EV to buy back this energy from you.
To sum up - without modifications to the motor (rotor), forget about free energy.

If you remake the rotor of a motor, the frequency of the current will depend on its rotation. Conclusion - you will not be able to connect all devices, preferably some heaters, they can handle everything.

And you thought about the costs for 1kWh, are you able to beat the ZE offer?

Now I do not understand how much my internal combustion engine will burn fuel, I will have to pay this much for fuel. I want to make an aggregate to connect a grinder, drill, saw to it, because sometimes they are needed in the workshop and the cable has to be pulled from home to the workshop.

pjetrekk15 wrote:

Now I do not understand how much my internal combustion engine will burn fuel, I will have to pay this much for fuel. I want to make an aggregate to connect a grinder, drill, saw to it, because sometimes they are needed in the workshop and the cable has to be pulled from home to the workshop.

You don't understand some things.
I wrote about it in the previous post.
WHEN WORKING AN ASYNCHRONOUS MOTOR AS A GENERATOR, IT IS NOT POSSIBLE TO OBTAIN THE ENERGY PRODUCED BY THIS MOTOR-GENERATOR SEPARATELY.
If you have a surplus of cash and want to support the Polish energy sector, I am all for it.

Let your grinder, drill, etc. draw a power of 1 kW (you have big tools), now count how much the combustion engine will burn for one hour, the revolutions must be high. I assume that you have a super extra diesel that will only burn under such conditions, I repeat only ONE LITER OF PETROLEUM.

Now compare the price of a liter of crude oil to the price of 1 kWh offered by ZE, I do not count the costly rework etc.

It would be a lucrative business for you if you had free energy to drive such an engine, an example would be water (dam, dam, lock).

Bottom line - give it a rest if you do not have free energy, in Poland electricity is so cheap that it is difficult to produce it below the ZE offer.
CHEAP - this does not apply to wages, only to production.

Well, I do not understand certain things, I want a simple answer, I will not use this aggregate day and night only occasionally. I want to get a simple answer, if I drive this 5.5kw engine with an internal combustion engine above its revolutions (1455 rpm), i.e. if I accelerate it to 1500 rpm and connect a voltage regulator, will I be able to connect a grinder to it? I mean a simple answer. If not, how do I convert the engine as described by Marek_Pe and you said that it will be busy then, you will have a great alternator, i.e. it will produce more kw? I am asking for understanding, I do not know much.

pjetrekk15 wrote:

Well, I do not understand certain things, I want a simple answer, I will not use this aggregate day and night only occasionally. I want to get a simple answer, if I drive this 5.5kw engine with an internal combustion engine above its revolutions (1455 rpm), i.e. if I accelerate it to 1500 rpm and connect a voltage regulator, will I be able to connect a grinder to it? .

The simplest answer - a grinder, drill and whatever you want, you will be able to connect. But for the energy used for the needs of this grinder, you will still have to pay ZE. So the question is why.

Kazik Staszewski sang - "all his hard work, everything was worth it,
probably if he was in the house he would be less of a loss "


As for the second part of the question, it does not pay off at all. Unless such art is for art.

Understand such a generator produces energy, but no one in this world can separate it from the supplied one.

But if I do as described by Marek_Pe, the generator from this engine will be ok? I will do nothing more, but I will remake it and drive it with an internal combustion engine and connect the cables from it straight to the voltage regulator and connect, for example, a grinder and everything will be ok?

pjetrekk15 wrote:

But if I do as described by Marek_Pe, the generator from this engine will be ok? I will do nothing more, but I will remake it and drive it with an internal combustion engine and connect the cables from it straight to the voltage regulator and connect, for example, a grinder and everything will be ok?

If the voltage is around 230V and the frequency is around 50Hz, you'll be fine.
Only the costs of this oil - after all, it will be very unprofitable, and keeping the quality of electricity in check is also quite a challenge.

In my opinion - buy a decent cable, let it go with earth, install 400 V and 230 V sockets in the workshop, it will be cheaper, more reliable and forever.

I have no idea how much today is 1 kWh of electricity offered by ZE, but I am sure that you will not even come close to twice its value, so from the economic point of view it is completely unprofitable.

The frequency and voltage depend on the inverter. It is important what power is drawn from the system, i.e. indirectly like strong magnets.

But this is unfortunately the method of trial and error.
A car alternator gives 200-500W, so a larger motor / alternator should give 1000-2000W. Or maybe more ??

Regards

ECH! People, you just need to connect a capacitor to each phase of the motor. As long as it has the right voltage and capacity. Spin it and it will wake you up. Even before the nominal speed is reached. And you set the voltage with the engine speed. Try with a few capacitors - e.g. from a washing machine or similar. This has one drawback - the capacity should increase with the power consumption. Many aggregates have just such an excitation. And no regulators.

Please contact Mr. Kamieński, in my opinion, he has sufficient knowledge on this subject.
George

It is possible to get energy - we connect to each phase after a capacitor and it works.
Residual magnetism will do the rest. Proven experimental. Find practical descriptions from our eastern neighbors. I did not check how efficient it is, but 3 100W bulbs were on.

Oh people, what do you guys say here, that it is impossible to make a generator. Connect 3 capacitors to the motor (for 5.5 KW it is about 137 ~ 187 uF), accelerate the motor to over-synchronous revolutions and load it with some light bulbs. And residual magnetism can be dealt with by applying a voltage of 12V from the battery for a moment between 2 phases and it should excite.

Some forum users say that it is possible to make an asynchron generator, you only need to use the appropriate capacitors, turn it off properly, and it should work. Tested experimentally by a friend whose friend saw somewhere that something was working there.

After all, this is a technical forum, not about romance, so those who say they can show some proof of their theory, connect these three capacitors and spin the engine.

With this way of thinking, I am able to throw a stone on the moon, I just have to use the right force and throw at the right angle (but what force and at what angle nobody knows).

I will not explain again why an ordinary asynchron cannot be made into a generator (separate). For those who know the structure and principle of operation of an asynchronous motor, there is no need to explain anything, and for those who do not know, let them learn.

I have seen and believed.
And there have been so many times.
Link

My friends got confused with the generator work of the asynchronous motor to brake the elevator. If we accelerate the motor connected to the phases to a speed higher than its rated speed, it will switch to generator operation and give energy to the network, but the efficiency of such a system is very low. There is no generator operation without the mains. If we want to make a generator out of it, we should make a rotor instead of a squirrel-cage rotor, which will generate a constant magnetic field.