Author Topic: Active Pitchcontrol  (Read 225043 times)

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mbouwer

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Re: Active Pitchcontrol
« Reply #675 on: May 14, 2017, 01:33:19 PM »
Determining the shape of my new coil winder.

So the starting point is 64 magnets and 48 coils. This means 192 coil legs?

mbouwer

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Re: Active Pitchcontrol
« Reply #676 on: May 15, 2017, 07:35:25 AM »
The coil heads must be bended out to cross each other.

mbouwer

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Re: Active Pitchcontrol
« Reply #677 on: May 16, 2017, 06:50:18 AM »
Modified coil winder.

SparWeb

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Re: Active Pitchcontrol
« Reply #678 on: May 16, 2017, 12:45:14 PM »
Make sure not to pull the wire too tightly.  If the coils are very tight, they will also be stiff and hard to lay on top of each other.
They also change shape as you bend them, of course, so keeping the straight sides to stay straight also requires "persuasion".
It will help a lot to leave some space between the coil legs so that they can be massaged as needed, to make them lie flat.
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

System spec: 135w BP multicrystalline panels, regulated by Xantrex C40, DIY 8ft diameter wind turbine, regulated by Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024

mbouwer

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Re: Active Pitchcontrol
« Reply #679 on: May 17, 2017, 03:22:28 AM »
A few test coils on the mould. To give the coilheads more space to bend they should be shaped a little longer.

hiker

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Re: Active Pitchcontrol
« Reply #680 on: May 17, 2017, 10:20:26 PM »
should be fine as long as the hole is the size of the mag...more dead wire will just add more resistance
WILD in ALASKA

mbouwer

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Re: Active Pitchcontrol
« Reply #681 on: May 18, 2017, 04:01:06 AM »
New inside measurements of the coils 46 mm / 10 mm / 8 mm
Coil legs: wide 4 mm / thickness 5 mm

Added a brake to hold the coil in position if neaded.

Adriaan Kragten

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Re: Active Pitchcontrol
« Reply #682 on: May 18, 2017, 08:37:06 AM »
Determining the shape of my new coil winder.

So the starting point is 64 magnets and 48 coils. This means 192 coil legs?

I don't understand this sentence and the following pictures. If you have 64 magnets, I suppose that you have 64 armature poles. If you make a 3-phase, 1-layer winding, you will have 3/4 * 64 = 48 coils. But in this case there are no crossing coil heads. The sequence of the coils is U1, V1, W1, U2, V2, W2 and so on. You only get crossing coil heads if you use 96 coils and a 2-layers winding.

This option for doubling the number of coils is explained in chapter 11 of my report KD 596 for a 12-pole axial flux PM-generator. Figure 8 out of KD 596 gives a picture of the winding. The first winding is lying at the bottom and the second winding is lying at the top. For a 1-layer winding, you only have the bottom layer. For an axial flux generator, one coil has two legs with radial positioning, one short inner coil head and one long outer coil head. For a radial flux generator, the coil pattern is identical but the coils heads have the same length. The coil heads of the first layer are bent to the outside to make the grooves free for the coils of the second layer.

mbouwer

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Re: Active Pitchcontrol
« Reply #683 on: May 18, 2017, 10:08:17 AM »
Correct me if I am wrong but it seemes to me that I am now using the method like it is also in chapter 11 fig. 8
96 coils / 2-layers winding / 192 coil legs.

mbouwer

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Re: Active Pitchcontrol
« Reply #684 on: May 19, 2017, 04:25:40 AM »
SparWeb,

A little persuasion will do now.

SparWeb

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Re: Active Pitchcontrol
« Reply #685 on: May 19, 2017, 05:50:16 PM »
Persuasion indeed!
Might want a system to keep track of all the wires.  More than just "in and out"...
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

System spec: 135w BP multicrystalline panels, regulated by Xantrex C40, DIY 8ft diameter wind turbine, regulated by Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024

mbouwer

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Re: Active Pitchcontrol
« Reply #686 on: May 20, 2017, 02:07:04 AM »
4 test coils out of the mould.
« Last Edit: May 20, 2017, 02:18:06 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #687 on: May 21, 2017, 02:40:16 AM »
At a 100 r.p.m. with 2 mm magnets one coil shows 0,1 volt.
Now trying coils with 0,3 mm wire.

SparWeb

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Re: Active Pitchcontrol
« Reply #688 on: May 21, 2017, 05:46:43 PM »
2mm magnets?

I must have missed something earlier. Why are your magnets so small?
I was guessing your magnets should be at least 10mm thick...
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

System spec: 135w BP multicrystalline panels, regulated by Xantrex C40, DIY 8ft diameter wind turbine, regulated by Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024

mbouwer

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Re: Active Pitchcontrol
« Reply #689 on: May 22, 2017, 02:59:59 AM »
The thougt is: first make a properly functioning design, and then scale up.

At a 100 r.p.m. the coil with the 0,3 mm wire gives 0,2 volt.
What about thinner wire?

midwoud1

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Re: Active Pitchcontrol
« Reply #690 on: May 22, 2017, 05:23:24 AM »
100 Rpm  and 0,3 mm  coil-wire  there is no power.
With extra windings and extra Rpm you can increase voltage.
0,3 mm wire  is no amps . Stator overheat.
Better make a Piggott generator with a gearbox  and  large pitch controlled blades .

electrondady1

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Re: Active Pitchcontrol
« Reply #691 on: May 22, 2017, 08:47:20 AM »
on posting #650 you will see the proper ratio between the thickness of the magnets and the thickness of the stator coils.
with thicker magnets the magnetic flux is projected a greater distance from the surface

mbouwer

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Re: Active Pitchcontrol
« Reply #692 on: May 23, 2017, 02:27:14 AM »
Midwoud,

It's my striving to use less heavy magnets.
But if I would meet someone who wants to build a Piggott design like yours I would ask for cooperation.

SparWeb

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Re: Active Pitchcontrol
« Reply #693 on: May 23, 2017, 08:19:15 PM »
Going right down to basics...  very basic...

You need to maximize "Electromotive force" and minimize the resistance.  I think the need to reduce resistance in the coils of wire is obvious, but there's a trade-off when going to larger wire, which you're aware of.  There are things you can do to make it work out.  It is a balancing act. 

If you haven't dealt with the expression EMF, Electromotive force (or its equivalent in Dutch "Elektromotorische kracht" ) then take a moment to read up on it, because it will help you balance the need for a strong magnetic field with your budget to spend on magnets.  I'm really not the best person to explain it, but I was exposed to the concept in college, and it has helped me a lot when I was building my own generators.

I think I can also point you to some online calculator webpages that will help you try various combinations of magnet size.  That may help you see what thickness of magnet you really need.  I stated my guess earlier (about 10 mm) but you could find a combination of 8mm magnets or maybe thinner, depending on what you want to do.

Gearing a turbine adds cost and complexity, so the money saved on magnets at the cost of gearing can easily be penny-wise-and-pound-foolish.
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

System spec: 135w BP multicrystalline panels, regulated by Xantrex C40, DIY 8ft diameter wind turbine, regulated by Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024

joestue

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Re: Active Pitchcontrol
« Reply #694 on: May 23, 2017, 11:44:42 PM »
In this case the magnet width is greater than the gap so the situation is reasonable.

In this particular case i would configure the magnets for 32 poles so that the cross sectional area of the magnet appears to be a 1:1 ratio, but this could be argued later.

mbouwer

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Re: Active Pitchcontrol
« Reply #695 on: May 24, 2017, 02:45:36 AM »
At professional wind turbine manufacturiers many disciplines work together. There is a continuous development.
That's also what homebuilders need. We can make it happen on a forum like this.


hiker

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Re: Active Pitchcontrol
« Reply #696 on: May 24, 2017, 07:00:47 PM »
missed out...back in 04  it was a everyday new build dam near...tons of picts and talk of builds.....guess i better hit the shop !!
WILD in ALASKA

SparWeb

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Re: Active Pitchcontrol
« Reply #697 on: May 24, 2017, 09:25:10 PM »
Hiker,
Many of us have noticed.
Popularity and dropping cost of solar is one factor, but I am not sure what is really behind it.
Maybe it is just that Facebook sucked most of our supply of new members away.
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

System spec: 135w BP multicrystalline panels, regulated by Xantrex C40, DIY 8ft diameter wind turbine, regulated by Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024

mbouwer

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Re: Active Pitchcontrol
« Reply #698 on: May 25, 2017, 02:46:36 AM »
We are talking about generating energy. A big advantage is that solar and wind energy can complement each other.
But it is not that easy to get a good and safe and reliable device on your yard.
« Last Edit: May 25, 2017, 02:54:05 AM by mbouwer »

electrondady1

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Re: Active Pitchcontrol
« Reply #699 on: May 25, 2017, 05:30:58 AM »
but now, at least you can talk about a vertical mill without being insulted called a Charlatan  or insane.
 

mbouwer

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Re: Active Pitchcontrol
« Reply #700 on: May 28, 2017, 12:42:44 PM »
After rereading lots of information on this and other topics it seems to me it's better to focus on radial+lamination core.

Found: Outer diam. 364 mm / inner diam. 234 mm / 48 slots

hiker

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Re: Active Pitchcontrol
« Reply #701 on: May 28, 2017, 04:40:24 PM »
Nice find....
WILD in ALASKA