Author Topic: Active Pitchcontrol  (Read 240053 times)

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mbouwer

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Re: Active Pitchcontrol
« Reply #864 on: September 30, 2017, 04:39:17 AM »
You're right. I have adjusted reply #862
I will buy 34 magnets. How would you connect the coils?

mbouwer

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Re: Active Pitchcontrol
« Reply #865 on: October 01, 2017, 04:40:11 AM »
Ready for packing the coils.
I want to have the start-and end wires outside of the mould.
Different circuits are possible than.
« Last Edit: October 01, 2017, 04:59:23 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #866 on: October 02, 2017, 04:02:09 AM »
Capturing the wires is depending on the way of connecting.

mbouwer

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Re: Active Pitchcontrol
« Reply #867 on: October 03, 2017, 08:34:23 AM »
Some measurements first.

SparWeb

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Re: Active Pitchcontrol
« Reply #868 on: October 03, 2017, 12:54:21 PM »
Looking good.
The oscilloscope finally give me some scale to judge the size!
How have they turned out?
May I ask if you are only testing resistance and continuity, or other parameters, too?
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 #869 on: October 04, 2017, 03:23:36 AM »
Once this test set up is working properly I can scale up.
With the scope it is possible to measure characteristics like volts when I move a magnet over a coil.
Now organizing the wiring.

mbouwer

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Re: Active Pitchcontrol
« Reply #870 on: October 05, 2017, 04:51:52 AM »
Plan for connecting the coils and shaping a terminal block.

mbouwer

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Re: Active Pitchcontrol
« Reply #871 on: October 06, 2017, 02:22:36 AM »
Got 68 magnets + glue.

mbouwer

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Re: Active Pitchcontrol
« Reply #872 on: October 07, 2017, 04:30:33 AM »
The magnets glued to their backing rings.

mbouwer

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Re: Active Pitchcontrol
« Reply #873 on: October 08, 2017, 03:32:53 AM »
Stator terminal block in polyester.

mbouwer

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Re: Active Pitchcontrol
« Reply #874 on: October 12, 2017, 02:37:44 AM »
The thickness of the lamination core is 11 mm.
Now stacking magnets.

mbouwer

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Re: Active Pitchcontrol
« Reply #875 on: October 15, 2017, 04:03:06 AM »
When ordering extra magnets I can make stacks of 3, 4 or 5 pieces.
 

mbouwer

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Re: Active Pitchcontrol
« Reply #876 on: October 18, 2017, 02:55:37 AM »
Is this real state of the art axial flux technology?

https://www.youtube.com/watch?v=rGu7XDapR58&t=
« Last Edit: October 18, 2017, 03:03:00 AM by mbouwer »

Mary B

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Re: Active Pitchcontrol
« Reply #877 on: October 18, 2017, 04:52:06 PM »
No design breakdown of how it is built... I smell snake oil...

Is this real state of the art axial flux technology?

https://www.youtube.com/watch?v=rGu7XDapR58&t=

joestue

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Re: Active Pitchcontrol
« Reply #878 on: October 18, 2017, 05:26:46 PM »
its been known for a very long time that axial flux machines have a higher torque density at the cost of efficiency.

the largest 5,7,10MW wind turbines are all radial flux, neodymium magnet machines. they also have generators in them that are larger than the 100MW hydro power generators. (which don't need any magnets to get the same "efficiency" )

mbouwer

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Re: Active Pitchcontrol
« Reply #879 on: October 19, 2017, 07:18:54 AM »
It is about whether this axial implementation on youtube, scaled down, can be a guidance for homebuilders.
« Last Edit: October 19, 2017, 07:27:21 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #880 on: October 22, 2017, 04:03:46 AM »
Turning at about 60 rpm it shows 1,5 volts.
Before scaling up what to do to improve this test set up?
Make a new thinner lamination core and thus less stacked magnets?

SparWeb

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Re: Active Pitchcontrol
« Reply #881 on: October 22, 2017, 12:59:02 PM »
My instinctive suggestion is to make each pole 4 magnets, two wide, instead of a stack of 5.  To illustrate:

You have shown:
Code: [Select]
------------- (ROTOR)
  N    S
  N    S
  N    S
  N    S
  N    S
             gap
~~~~~~~~~~ (STATOR)
             gap
  S    N
  S    N
  S    N
  S    N
  S    N
------------- (ROTOR)

My recommendation:

Code: [Select]
------------- (ROTOR)
 NN   SS
 NN   SS
             gap
~~~~~~~~~~ (STATOR)
             gap
 SS   NN
 SS   NN
------------- (ROTOR)

This arrangement allows the flux path to be much shorter for all magnets, and is both thermally and structurally more stable.
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 #882 on: October 23, 2017, 07:49:36 AM »
For your recommendation I need to buy extra magnets 10 x 4 x 2
To be able to apply your rated remarks I believe it's better to restart this test set up with a larger diameter.
Starting with new backing rings and magnets and new lamination core and coils.

XeonPony

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Re: Active Pitchcontrol
« Reply #883 on: October 23, 2017, 09:12:47 AM »
I'm building my turbine with a hub with a hollow center, and was wondering if any new developments on controls for variable pitch systems. I sadly never got into programing and was wondering if some one would sell a programed arduino with a copy of software so if it fails can just program a new one?

I have no shortage of linear actuators. But control systems not so much! I ordered a new breadboard so eventually I can prototype analog controller but need ideas.

I want to do as much of the work on paper possible to save allot of fab head aches!
Ignorance is not bliss, You may not know there is a semie behind you but you'll still be a hood ornimant!

Nothing fails like prayer, Two hands clasped in work will achieve more in a minute then a billion will in a melenia in prayer. In other words go out and do some real good by helping!

SparWeb

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Re: Active Pitchcontrol
« Reply #884 on: October 23, 2017, 12:15:55 PM »
Quote
...Starting with new backing rings
???
You make me hesitant to reply. 
It sounds like you are about to discard much of your work simply on my last hunch.  I hope that is not true!
I was attempting to suggest an improvement to your magnet poles without requiring you to change any of your other components such as the rings.
But from this you take the message that you need new rings?  I would expect a discussion, not a redesign.
From my point of view, I can see very little of your project as a whole. 
Please do not overreact to my humble suggestions.
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 #885 on: October 23, 2017, 01:10:12 PM »
Sparweb,

No problem at all. Wind energy excites me very much and all the comments of windmillfriends I find very valuable.

Regards Rinus


Bruce S

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Re: Active Pitchcontrol
« Reply #886 on: October 23, 2017, 01:37:11 PM »
mbower;
What Sparweb;
Posted makes sense to be .
From the days of early NEOs, I remember there being a pretty long discussion about stacking NEOS. Even stacking the hard drive NEOS on top of ceramic ones
The more you stack the less "Flux" depth comes to mind, so if you re-stack those sets you have, per Sparweb's illustration. You should see a similar voltage, not to mention each re-stack will net you spare magnets.

It is certainly worth a try, before ordering more magnets or at least try while waiting for the others to arrive.

Just a thought

Bruce S
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mbouwer

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Re: Active Pitchcontrol
« Reply #887 on: October 24, 2017, 06:49:28 AM »
So if it is slightly possible no more stacking.

Modified hub of reply #839
New support of the magnet backing rings.

electrondady1

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Re: Active Pitchcontrol
« Reply #888 on: October 24, 2017, 07:45:26 AM »
i recall conversions about stacking magnets and experiments with  stacking a second magnet on top of the first does not double flux density it only ads about 20 %. were as placing two mags side by side doubles the lines of flux a coil cuts through.
 

mbouwer

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Re: Active Pitchcontrol
« Reply #889 on: October 25, 2017, 03:09:04 AM »
Size backing rings is 10 x 5 mm.The idea is to make lamination packages of 10 x 4 mm ( thickness 8 mm )

midwoud1

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Re: Active Pitchcontrol
« Reply #890 on: October 25, 2017, 06:29:05 AM »
Hi Xeon Pony.

My blade pitch controlled windmill is a very nice working windmill.
If you have some technical experience its not difficult to make.
It is clearly explained in de topic.
Some additional information.
The wind turbine is a 10 feet Piggott 24 volt with variable blades , controlled by a lineair actuator and an Arduino Uno
programma  in  C language.
The software is custom tailored for max 350 rpm and min 260 rpm.
If you need other rpms it's easy to change the software ,I can send you by PM.

Rgds  Midwoud1