Author Topic: Active Pitchcontrol  (Read 331822 times)

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mbouwer

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Re: Active Pitchcontrol
« Reply #660 on: April 26, 2017, 04:54:08 AM »
If you think the laminated magnetrings are a problem I can make new ones.

The hub with the two bearings. I tried to shape it light and robust.

joestue

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Re: Active Pitchcontrol
« Reply #661 on: April 26, 2017, 06:29:04 PM »
laminated or not, no problem
My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

mbouwer

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Re: Active Pitchcontrol
« Reply #662 on: April 27, 2017, 05:42:45 AM »
New magnet backing rings.

mbouwer

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Re: Active Pitchcontrol
« Reply #663 on: April 27, 2017, 05:09:43 PM »
Fastening.
More space now for the overhanging coils.

mbouwer

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Re: Active Pitchcontrol
« Reply #664 on: April 28, 2017, 06:31:02 AM »
Rear magnet backing ring on the hub. It is possible to also ajust this ring on behalf of the air gap.

mbouwer

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Re: Active Pitchcontrol
« Reply #665 on: April 28, 2017, 07:04:35 AM »
Ajustment. For the final assembly I think it's better to use lock nuts.

mbouwer

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Re: Active Pitchcontrol
« Reply #666 on: April 29, 2017, 09:06:06 AM »
Now to go on with the generator at eye level I need a tripod and a yaw bearing.
« Last Edit: April 29, 2017, 09:25:28 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #667 on: April 30, 2017, 04:41:17 AM »
There is another reason why a 3-phase winding is more favourable than a 1-phase winding and that's that you can get more power out of the generator at a certain rpm for the same armature.

This really appeals to me.
Now I have to decide about the number of magnets and coils.
« Last Edit: April 30, 2017, 04:53:49 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #668 on: April 30, 2017, 11:43:49 AM »
This yaw bearing is easier to make than the one of Reply #590
Also, in the event that I could make one for a windmillfriend.

mbouwer

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Re: Active Pitchcontrol
« Reply #669 on: May 01, 2017, 05:33:37 AM »
The stuff is on the test stand and now I can shape the wooden mould for the stator.

The magnet backing rings are diam. 300/256 and 4 mm thick.
How to determine the optimal number of magnets and coils?


joestue

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Re: Active Pitchcontrol
« Reply #670 on: May 02, 2017, 03:42:03 AM »
were the magnets you have 10mm wide? if so if you place 64 magnets on each disk you have 14mm for each magnet on the outer diameter for each magnet, on the inside diameter you have 12.56mm available.

this is fairly reasonable.

as far as the number of coils you have a lot of options. did you intend to move to wider magnets?
My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

mbouwer

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Re: Active Pitchcontrol
« Reply #671 on: May 02, 2017, 05:09:23 AM »
The backing rings are 4 mm so I think I have to buy new magnets thickness 4 mm.

A suggestion for my setup:

mbouwer

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Re: Active Pitchcontrol
« Reply #672 on: May 04, 2017, 09:24:09 AM »
Lots of great information on this forum about designing a generator.

My rough cut moulds.

midwoud1

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Re: Active Pitchcontrol
« Reply #673 on: May 04, 2017, 02:54:41 PM »


       https://www.windgenkits.com/pages/test-page-with-tech-stuff

 One of the best videos to make an Axial Flux  PMA  for HAWT  and VAWT

mbouwer

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Re: Active Pitchcontrol
« Reply #674 on: May 05, 2017, 08:30:45 AM »
Much knowledge and great craftsmanship over there.
Maybe it's a good idea to ask them to put together my  3-layer stator.

mbouwer

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Re: Active Pitchcontrol
« Reply #675 on: May 14, 2017, 03:33:19 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, 09:35:25 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, 08:50:18 AM »
Modified coil winder.

SparWeb

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Re: Active Pitchcontrol
« Reply #678 on: May 16, 2017, 02:45:14 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, Xantrex C40, DIY 10ft (3m) diameter wind turbine, Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024
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mbouwer

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Re: Active Pitchcontrol
« Reply #679 on: May 17, 2017, 05:22:28 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 18, 2017, 12:20:26 AM »
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, 06:01:06 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, 10:37:06 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, 12:08:17 PM »
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, 06:25:40 AM »
SparWeb,

A little persuasion will do now.

SparWeb

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Re: Active Pitchcontrol
« Reply #685 on: May 19, 2017, 07:50:16 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, Xantrex C40, DIY 10ft (3m) diameter wind turbine, Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024
www.sparweb.ca

mbouwer

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

mbouwer

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Re: Active Pitchcontrol
« Reply #687 on: May 21, 2017, 04:40:16 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, 07:46:43 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, Xantrex C40, DIY 10ft (3m) diameter wind turbine, Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024
www.sparweb.ca

mbouwer

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Re: Active Pitchcontrol
« Reply #689 on: May 22, 2017, 04:59:59 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, 07:23:24 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, 10:47:20 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, 04:27:14 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.