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diy solar

diy solar

Building the sickest ® VAWT ever. Brilliant minds unite please!!

I'll bet you an adult beverage that your modern scopes have isolated shields and differential inputs. Haven't you been annoyed when the shield clip falls off and you start getting wonky traces? That's because it is actually the signal return, not just a shield ground.

Of course it is the return signal. At low frequency, about the same as ground, but at high frequency there will be ringing if not connected.
And of course our DUT is often isolated, so ground isn't there as a return.

Here is one with isolated inputs:



"All inputs are floating and fully isolated in line with CAT IV 600 V, CAT III 1000 V safety rating. See figure regarding isolation rating on page 14."

One thing to look for is insulated knobs on BNC connectors.
Wouldn't want to connect shield to line voltage without that!

I'll leave the LeCroy off that bet since it probably runs Windows as an OS. No telling what they do. I had to use one once and was not impressed with it.

Sure does. Gotta navigate pull-down menus to get anything done. Like finding function "Integral".
I wish the PC/interface was a replaceable single board computer, and the real-time guts weren't something getting Microsoft updates.

But 3-window display was handy to directly display BH curves on the right, time domain waveforms on the left.


as for the oscope. here is a link to the manufactures shop.

OK, use DMM to measure continuity between two BNC.
If zero ohms, then I suggest you deposit Gary's schematic in the circular file.
If open or very high impedance, I owe him an adult beverage.
 
OK, use DMM to measure continuity between two BNC.
If zero ohms, then I suggest you deposit Gary's schematic in the circular file.
If open or very high impedance, I owe him an adult beverage.
That's a great idea. I'll test mine tomorrow as well. The adult beverage is a good idea either way!
 
I tried Gary's schematic and that seems to short the PMA. So i stopped pursuing that :( Thanks non the less for thinking along and trying out stuff.

But once I confirmed line to line readings with a multi meter I hooked the PMA up to the battery bank and am now able to reach, with a base line voltage in the bank of 48.7;
Vdc(in): 49.6
Amps: 4.6
W: 228
1728547353486.png
Trying to go any faster makes the VFD trip the circuit breaker it is on.

At least this is a small success finally. Something to calculate with a bit better for the gear ratios before the PMA will be hooked up to the turbine.

The PMA itself will also need a mayor upgrade as it is now just a proof of concept that is horribly unstable and looking horendously
 
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@Hedges , I owe you an adult beverage. I tested my scope and found that all four shield clips are bonded together. I'm not sure they are actually grounded, but they are definitely tied to the same reference.
 
Yeah, something along these lines is how I like to probe line voltages.
But I've only got one, and at work one of the 600V models.


I often use a step-down transformer, at least around 60 Hz. Like if I want to compare voltage to what current probes show.
 
In the meantime I think I invalidated my hypotheses in where I was thinking that density as opposed to empty space in coils is important.

Please consider this image
1729247726466.png
we have here the dead space between 4 wires with a radius of 30mm. The radius is really not important now as we will be using relatives. a 60mm diam wire in real life is going to be problematic to say the least :)

The area of the big wire is ≈ 2827.43mm2

the smaller wire has half the radius yet the area is smaller than half of the big wire at ≈706.86mm2

To get the same area of big wire we need 3.9997170345217883418222976796831 times the smaller wire.

Now the dead space between the big wire is 774.584817 mm² / the dead space at the smaller wire (193.646204 mm²)
= 4.0000000051640568177623559303027

there you have it. there is more dead space.

granted it is miniscule.

Now I am going to make new coils with the same coil wire size of 0.71mm diam. Because then they are still malleable. (Going any larger like the 1mm wire I have is just too much of a fight if we want to keep using this serpentine like coil configuration.)
So 2 x wires in parallel at half the winds and double the PMA RPM. that should provide us with around 9 amps I am hoping.

I will share some results later next week.
 
@Hedges , I owe you an adult beverage. I tested my scope and found that all four shield clips are bonded together. I'm not sure they are actually grounded, but they are definitely tied to the same reference.
is it worth a try then to clamp all 3 black clips together? Hedges stated as much earlier but now we have additional information.

I mean I can try with hand spinning the PMA first as to not overload the oscope.
 
btw. the making the disks a perfect circle in order to get to a balanced situation is not al all difficult.

Just hold something abrasive at a set point and there you go.

Now of course we have to deal with all those magnets attracting the debris.
 
Bro double or triple helix is best and vibration is the enemy
Ease of service is important
In the winter leaves fall of and wind chanel close to the ground
I also think wind wind is energy dense and energetic in cold temps
We just just need power during winter months to counter effect of wind chill
This is what I'm proposing and we should team up. We can build 3 walls 60 degree apart to channel winds
 
here is what I have for the coil holder.

1729266175958.png

it will shorten the mission by 5 years and save millions of lives.


It will enable us to easily try different coils without the endless headaches.

aiii!!!
 
Sweet. Although not balanced yet we now are woble free. Laser line level precision.

Also this beast now rotates freely for like 5 minutes, on inertia alone, so mechanical resistance has been reduced considerable since we have no more need for a wheel to prevent woble.

1729346936722.jpeg

I am looking forward to high rpms after removing that before mentioned wheel. It has lost it's need and will be retired with honors.
 
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Sweet. Although not balanced yet we now are woble free. Laser line level precision.

Also this beast now rotates freely for like 5 minutes, on inertia alone, so mechanical resistance has been reduced considerable since we have no more need for a wheel to prevent woble.

View attachment 250869

I am looking forward to high rpms after removing that before mentioned wheel. It has lost it's need and will be retired with honors.

Hey, I told you to use guy wires to stabilize the turbine ... not the armature!
 
@justgary Please let us forget about plants for the time being. let us zero in on what you meant with getting 300 watts+ and then I'd be on to something.

Concerning that I am sad to have to report that I made another brain fart.

I can never have a 14m diam turbine as that would mean clipping palm leaves. Again something I missed in my optimistic way of thinking :(
1729874152329.png
However. Please all let us just get this out of the way. This elephant in the room.

300 watts and then I win or are there others that need more information and/or wattage?
 
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Oscilloscope typically has BNC shells grounded.
Can't put 3 channels across delta windings. Could measure the 3 corners of delta with 3 probes, but ungrounded delta isn't referenced except the 3 corners to each other.

Wire as Wye.

View attachment 248891
Connect three scope channels to A, B, C.
Connect ground clips of all channels to N.

Or mount BNC sockets wired to stator and use BNC cables to connect scope.

If voltages will exceed max allowed voltage you can make dividers.
For low frequency just resistive dividers should do. Low impedance overpowers scope input impedance.
Higher frequency, capacitors in parallel with resistors flattens the response. Include scope input impedance in calculation of values.

I assemble 2x panel mount BNC back to back with standoffs between their mounting holes and wire parts between them for attenuator, surge arrestor, etc.

View attachment 248892

View attachment 248893
Star you meant?

Anyway I will gather "scientifically" data like that and also delta.

Make us a nice spreadsheet and then all can have a go at the data.

All in all Hedges? have you been preparing for this off grid utopia non sense I am aiming for?
 
"Star" is commonly used to refer to grounding schemes and network topology, no phase angle involved.

Power generation uses "Wye" or "Delta", typically 120 degree angles.
 
"Star" is commonly used to refer to grounding schemes and network topology, no phase angle involved.

Power generation uses "Wye" or "Delta", typically 120 degree angles.
thank you brother. now we get to choose where we start to test.

I think like this;
star like;
serial
star like
para

detla
conntected
or
in para?
 

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