Constructing Affordable Low-Speed Generators: Types, Data & Guidelines without Capitals

I mean various types of generators, really low-speed. In order to make it as cheap as possible. Please provide all possible data. Thanks for the information.

Do not use capital letters in the title -- > RULES. [hefid]

Hello.
What power, voltage etc?

Hello buddy, a slow-speed generator, power of about 2KW can be more, [about 60 turns] the voltage as much as possible [preferably 220V 50Herc] can be 3-phase.

I recommend the topic of building a wind farm there is a lot about building such a device. I don't recommend building a single-phase generator. there is a reason why AC circuits are 3ph

The rotational speed of electric machines depends on the number of pairs of poles.
Synchronous speed of a machine with one pair of poles = 3000 rpm
with 2 1500 with 3 pairs 1000 with 4 pairs of poles 750 etc. Depending on what speed you want the machine must have the right number of pole pairs. If you want 3 phases, windings x3. I think it is possible to rewind a standard motor to more pairs of poles. You'd have to look at the literature. I don't remember the author or the title. "The Rewinder's Guide"? something like that.

It's for the stator winding. As for the rotor... The generator must be a synchronous machine. Otherwise it doesn't make sense. It is necessary to make the rotor poles on the rotor appropriate to the number of pairs of poles in the stator. Ride all the way. Windings, of course, although I think permanent magnets are better as in factory low-power generators.

I think it's better to give up and do the transmission. Even 2 steps.

60 rpm gives 50 pairs of poles. Unreal. forget it.
375 rpm (8 pairs of poles) are the slowest generators I've ever heard of.

In addition, to obtain a mechanical power of 2 kW to drive the generator at this speed, you need torque = 318 Nm. To my eye, the dynamo shaft should be quite solid Not to mention the bearings.

voltage as much as possible [preferably 220V 50Hertz] can be 3-phase.[/quote] I emphasize the voltage as much as possible can be even 12V [American generator].

Well, then make this American, some buffer and an inverter. It can be done. Because making a generator that gives a current of=50Hz at this rotational speed is not-re-al-ne.

Quote:

is not-re-al-ne.

- is real. Only unprofitable in this power (2kW). But my question is about:

Quote:

there is a reason why AC circuits are 3ph

- I'm in the process of "creating" the "American" type PMG (i.e. brake discs). The first one I made, by "mistake" it was biphasic (which had its advantages and disadvantages). Now it will be three-phase. Sheriff: Can you describe the reason?

I just came across this topic recently and it intrigued me.
I am also thinking about making a generator, but in the range of 750-1000 rpm, I also thought about an original generator made of small aggregates, only that there is a problem with the speed, because as much as 3,000, there is no chance to get such from the windmill, too much gear and resistance. with a request if any of you could sketch generators with 4 pairs of poles, because in the books they have only those for 3000 rpm.
thanks in advance for the tips

hello first time on the forum
I'm thinking how to save something and I came up with 2 solar collectors, but the water is warm when the sun is shining - so a windmill, Pawlak's turbine 18cm by 35cm. I wanted to use a mosquito magneto for this 6V battery and I would have lighting in the yard, but it didn't work, only problems. I removed the generator and the turbine itself spins. \
Maybe someone has documentation for a 6V volute generator, e.g. American, if it can be made 6V and 18cm in diameter.

Hello.
I was also looking for something about low-speed generators. It turns out that the Chinese are doing something very interesting. On page www.ginlong.com there are several shown, including photos, cross-sections, graphs of power and voltage vs. RPM. Unfortunately, there are no prices, but I suppose that taking into account the place of production, the construction of such a building may be unprofitable.
Here is a link directly to these generators:

http://www.ginlong.com/wind-turbine-pmg-pma-permanent-magnet-generator-alternator.htm

Here is an example Polish page - experiments with a converted washing machine motor,
parameters rather bad:
http://www.elektrownie.tanio.net/motor_pralka.html
(achieved power of 40 W)

And here is a page from the USA about wind farms - there they already show how to achieve several hundred W:
http://www.otherpower.com/trips1.html
The generator is on neodymium magnets - 24 pieces, dimensions 2x0.5 inches.
As it was a few posts above, there is a lot of information on Elektroda in the thread about wind farms:
https://www.elektroda.pl/rtvforum/topic277125-0.html

It's a simple job - they should require these skills in elementary school:
wrap on sticks

and pour into the mangers

stick neodymium

And just spin

Hello, can you tell me how you wound the stator (wire thickness, number of turns, how to connect these coils), what neodyms you gave, what gap between the rotor and the stator and what power you pulled out at what speed, greetings

nanadomi wrote:

Hello, can you tell me how you wound the stator (wire thickness, number of turns, how to connect these coils), what neodyms you gave, what gap between the rotor and the stator and what power you pulled out at what speed, greetings

Wire frames are poured into the stator (first, they must be prepared, divided and arranged on the winder).

Any thickness of the wire can be poured into the grooves - to make it fully and evenly (comb) by pressing.
The coils do not need to be connected, only the entire stator with one wire without cutting and soldering - it pours in.
Neodymium - the bigger the better in the rhythm of frames of one phase, so that N and S alternate.
Power and speed are provided by the wind turbine as long as the wind allows, and the generator is very resistant to the mast.
In order to burn this winding, more than 10 A must flow through the Φ 1 mm wire and for a long period of time without cooling.
Calculating 3 phases x 10 A = 30 A. The voltage to withstand the wire insulation (lacquer) is 500 V. For this generator to burn, at least one condition must be met: 30 A without intensive cooling or 500 V.
In order to meet the limit requirements for combustion at the same time, the power of 30 A x 500 V = 15 kW is required.
I invite you to build generators at:
https://www.elektroda.pl/rtvforum/topic277125-8850.html
Regards

Maybe you know where slow-speed generators can be used (in what machines, industries) because new ones are far too expensive, and you could figure something out. Regards

To col. JESIOTR1 thanks for the hint and diagram, at the moment he is not dealing with the topic due to lack of time.
Until kol.bolo2703, low-speed generators used to be mounted in wagons [today maybe also], but they are very heavy. Regards

Hello
I wonder why everyone wants to build low-speed AC generators. Practically, the frequency of 50 Hz is not achievable with amateur windmills. Isn't it better to use, for example, a DC motor as generators, buffer, and finally converters?

The low-speed dynamo just has a lot of wire. The more wire, the more power at slower speeds. You won't reach 50 Hz and it will be difficult with the voltage as well. Make a 12V/24V/48V generator and rectify the voltage and then use an inverter because otherwise if you change the speed even a little everything you power this generator will burn because the frequency will change. Don't look at the voltage, just how much A you can get out of it. If I had, for example, a battery with a huge capacity and efficiency, but the voltage was, for example, 2V, I could still raise it to 220V and power, for example, a TV or computer. It's the same with the generator.