axial generator with lamination core

[mbouwer]

People are sometimes really driven to build a savonius.

[Bruce S]

The "mill" in that picture is not a true Savonius as it is set up.
Typical "S" types have the "buckets" overlapping.

Not sure that the one pictured would even stay up in a decant wind.

However, I do agree, some will go to strange lengths :-)

Cheers
Bruce S

[mbouwer]

What to think of Mingyang's new 22 MW concept?
Which transmission and generator will be used there?

[mbouwer]

What I read is that they use a medium speed gearbox and a permanent magnet generator.
Should we for diy also go in that direction with a small axial generator driven via an acceleration stage?

[Mary B]

What I read is that they use a medium speed gearbox and a permanent magnet generator.
Should we for diy also go in that direction with a small axial generator driven via an acceleration stage?

Would only be viable in larger machines... a 2 meter rotor would lose to much power in the gearing... have to balance tower needs(larger the rotor the more robust the tower needs to be!) against rotor size, and cost of both... sure step up to a 2 1/2 or 3 meter rotor, but then step up your tower design...

[mbouwer]

For example this small generator with a 2- stage gear chain drive mounted in front of it.

[Bruce S]

Very nice windings! What size is the wire?

Cheers
Bruce S

[mbouwer]

@ Bruce,
It's one of those small axial generators that you can buy on the internet for a price for which you can't make it yourself for.

[MattM]

Looks like Aliexpress.  Scammers.

[Bruce S]

@mbower
IF you still have the link, would PM me with it please?
I'm curious about the wire as it looks like it's either very thin wire, or flat wire.
IF it is flat wire, then it is not worth the time due to the same issues using flat wire that even the guru's from years past on here have had.
IF it is very thin wire, then the voltage will be interesting.
I'm also betting the 2-stage is an external step not internal to this built unit.

@MattM  I've ordered from Ali--express for years now and have always gotten what I ordered.
However, I always read and copy the description of the stuff I'm ordering and expect an answer from the seller long before I place an order.


Cheers
Bruce S

[mbouwer]

@Bruce,
Search for: 100 Watt DIY Micro Generator.



Should the iron core and the backplate consist of laminations?

[MattM]

Why go this route when they sell more similar to Piggott for either 9 coils at $100 or 12 coils at $110?  These tall coils look too deep relative to the DIY versions.

[mbouwer]

These coils have the great advantage that they have an iron core.
But I don't know what material the core is made of.

[MattM]

Sure looks like steel rather than simple iron.  They do leave the steel core open in their set ups.  Eddy currents need 2 dimensions to form.  The open cores removes depth to the steel.  You may get some eddies forming vertically but those should have minimal impact on cogging.  Metal under a moving magnetic field will still heat.  Is the open steel core able to cool off relative to the copper is the real question.  They have different expansion rates and the steel will expand 10x faster than the copper.

[mbouwer]

Isn't this just an axial version just like a radial version where there is a stator with teeth built up from stator sheet laminations.
The iron of the stator and the cores of the coils must be able to change polarity very quickly and must not become permanently magnetic.

[MattM]

It would be interesting to see if that was the case by mounting freely rotating magnets under each coil.  If a north magnet was above the coil then the magnet under the coil should rotate its south pole towards the coil.  But I believe that all the magnets interact simultaneously.  The magnetic fields and coils do not match in numbers, so in reality only one coil at a time should truly be under polarization.  The others are all in a state of transition.

[mbouwer]

Small axial generator to build a working model of a windmill.

[mbouwer]

9 coils / 12 magnets.
According to the Bavaria Winding Diagram Table, 9 coils / 10 magnets would be a better combination.

[mbouwer]

This mini wind generator with planetary gearbox is a great starting point for a model of a Nordex windturbine.

[mbouwer]

Starting with the top part of the mast as a tripod.

[mbouwer]

The lattice mast is covered with polyester and has 2 sliding bearing rings in the top.
The pivot of the yaw-bearing fits into these rings.

[mbouwer]

Base of the nacelle with the main bearing housing is mounted on the yaw bearing.
I now need to make the main axis.

[brandnewb]

Yes brother,

I am thrilled that you also just keep informing us over on this site.

Look, I hold you int he highest of esteem of course. And thus please keep hanging out here.

Yet do know that I read between the lines.

Anyway back on track. I would still like you on board on how to quantify this power generation aspect of our builds.

I sure am still failing at it. I just so hope that a new insight might just get the show on the road.

Kind regards

[mbouwer]

Assembling the main shaft with slotted holes for blade adjustment.

[mbouwer]

The main shaft directly drives the planetary gearbox.

[mbouwer]

To shape the spinner with the blade suspension I want to continue with parts I made earlier.

[mbouwer]

Main axle with blade suspension.
1 mm sheet steel with a first layer of polyester.

[mbouwer]

Now 3 new blades like this one. A foam core covered with polyester.

[MattM]

You must be getting close to assembly.

[mbouwer]

Blades 2 meters diameter. Like the Nordex they have to run about 20 revolutions/min.
I now need a blade adjustment mechanism.

[brandnewb]

OHH WOW!!

if it is 2m diam then my municipality (or is it province?) can not not allow for it!! based on diam alone.

Is it the same where you are operating from?

Anyway I fear that with a 2m diam, things will pretty much be rendered useless.

I soo hope I am mistaken as that will open a whole new window of opportunity once I get my skills together as to make no noticeable sound and be sure things do not become lawn darts. Especially at the RPM I think one needs to be able to extract some useful power out of the wind whilst not potentially killing anything in a 40 meter radius when s*&t hit the fan.

I am soo open for polite discussion. I mean now we know my fears.

{1}
I get 0.05195Kw of available wind power at 3m/s when using a 2m diam HAWT. according to
https://www.omnicalculator.com/ecology/wind-turbine
that is.
at 5m/s that would be 0.24053KW

I am not sure if this all makes sense so please let us try and figure this out together ok?
{/1}

[mbouwer]

@ Brandnewb,

Our government is increasingly positive about wind energy.

[mbouwer]

Parts of the blade adjustment.