Author Topic: Active Pitchcontrol  (Read 181712 times)

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mbouwer

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Re: Active Pitchcontrol
« Reply #621 on: April 07, 2017, 07:47:55 AM »
Perhaps next time I can try carbon fibre.

Mary B

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Re: Active Pitchcontrol
« Reply #622 on: April 07, 2017, 04:24:49 PM »
Nice! Wondered how big this was going to end up.

kitestrings

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Re: Active Pitchcontrol
« Reply #623 on: April 07, 2017, 06:52:29 PM »
Bigger than I'd pictured.  Can't wait to see it all assembled.  Great stuff. ~ks

mbouwer

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Re: Active Pitchcontrol
« Reply #624 on: April 08, 2017, 01:59:24 AM »
Thanks for your response. I just want to make a test set up to get more contacts with windmillfriends and to exchange ideas and parts.
I think the blade suspension can be made more simple and easyer to do.
Making the generator I find more difficult.

mbouwer

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Re: Active Pitchcontrol
« Reply #625 on: April 13, 2017, 01:38:50 PM »
For a few days I was on the section Hydro. Perhaps I can meet likeminded people there who have interest in making a water turbine.
But now it comes back on making the generator.

mbouwer

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Re: Active Pitchcontrol
« Reply #626 on: April 14, 2017, 06:33:05 AM »
A lot of simularity between a water- and a windturbine. For example the blade pitch.
 
« Last Edit: April 14, 2017, 06:41:47 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #627 on: April 16, 2017, 03:40:20 AM »
It would be nice to meet someone on this forum who also is interested in making the generator.
 
« Last Edit: April 16, 2017, 03:45:47 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #628 on: April 17, 2017, 06:04:52 AM »
On the circumference of this generator rotor-ring I can glue 64 neodymium magnets ( 20 x10 x 2 )
What then is the best arrangement for the coils?
« Last Edit: April 17, 2017, 09:42:20 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #629 on: April 18, 2017, 11:21:09 AM »
In this coil configuration. Do I also take the ratio 4 magnets on 3 coils?

hiker

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Re: Active Pitchcontrol
« Reply #630 on: April 18, 2017, 12:03:36 PM »
WILD in ALASKA

joestue

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Re: Active Pitchcontrol
« Reply #631 on: April 18, 2017, 01:18:59 PM »
In this coil configuration. Do I also take the ratio 4 magnets on 3 coils?

The blue coils would be positioned over the north pole of the magnets, with the south poles in between them.

As shown, each of the coils would be wound in the same direction. O O O O

If you wind the coils like this OOOO then every other coil is reversed (you will also have twice as many of them), and you also have two coils in each slot. usually they are wound this way because the end turns are slightly shorter, but it may be harder to get the wires into the slot.

I suggest you try a 66 slot machine. the wiring diagram can be found here:
https://www.emetor.com/edit/windings/

you may be able to wind the coils over the top of a laminated metal backing plate without using any slots cut in the metal. the frequency you get out of this thing is going to be very high. you may need to use fine wire due to eddy currents in the wire. (you will have to anyway because the coils will hardly be 1cm in width)

In my opinion a more reasonable option is to make a 32 pole machine, which might get you more torque due to less leakage flux. the magnet poles would be square in cross section which is more ideal, you just arrange the 64 magnets like this: nnssnnssnnss.

a 32 pole machine can't use a 33 slot stator unless its a two layer winding which is more complicated to make, but a 30 tooth stator is a good fit and the least common multiple is still rather high at 480, much better than a 96 slot stator which would have an lcm of.. 96. but not nearly as good as the lcm of 2112 for the 64 pole, 66 slot machine. higher LCM= less cogging torque.

« Last Edit: April 18, 2017, 01:38:47 PM by joestue »

mbouwer

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Re: Active Pitchcontrol
« Reply #632 on: April 19, 2017, 01:56:38 AM »
Can we say that working further with this ring and these magnets is not going to bring a nice generator?
The metal work is no problem for me.
How to make a new start?

hiker

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Re: Active Pitchcontrol
« Reply #633 on: April 19, 2017, 10:39:34 AM »
whats the problem ? 
WILD in ALASKA

joestue

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Re: Active Pitchcontrol
« Reply #634 on: April 19, 2017, 01:36:24 PM »
Its just a challenge of how to build the stator.

If you can take steel pallet banding strap and anneal it in a furnace, you maybe able to wind it edge wise around a cylinder, then use it as a backing plate to glue the coils to. 

CraigM

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Re: Active Pitchcontrol
« Reply #635 on: April 19, 2017, 02:32:00 PM »
Remember seeing this posted by oztules

"Yes, I was going to suggest the iron wire technique. I did a story on the Seeley conversion here."  http://www.otherpower.com/images/scimages/5171/seely.html, and one of the photo's clearly shows the iron wire backing like this:
  .... may help?

CM - Use a soft, very low carbon wire.
Brain engaged in Absorption Charge Mode... please wait, this may take awhile.

CraigM

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Re: Active Pitchcontrol
« Reply #636 on: April 19, 2017, 03:02:54 PM »
Another option if you can find it is to use the "I" section of an E transformer, tape them end to end and wind a toroid core. Your flux lines will enter the flat side of the laminate instead of the edge... not sure how much loss this will incur.

I was able to find packages of silicon steel "I" sections at the local scrapyard. Have a bunch of this stuff and not sure what to do with it.
Brain engaged in Absorption Charge Mode... please wait, this may take awhile.

joestue

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Re: Active Pitchcontrol
« Reply #637 on: April 19, 2017, 03:41:12 PM »
how thin are those laminations?
if they are .010" or less i can use them to make inductors for sine wave filters for vfds, but i'm not sure i'll use them either..

He could wind a toroidal core with those strips of metal, but... he has a radial machine, not an axial one, the laminations need to be oriented 90 degrees to the induced voltage.

mbouwer

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Re: Active Pitchcontrol
« Reply #638 on: April 19, 2017, 03:51:36 PM »
The metal work is no problem for me.
But I think that does not mean that I am capable to make a generator on my own.
Can we start to talk about a design that others also want to make. Perhaps cooperation is possible.
« Last Edit: April 19, 2017, 03:59:29 PM by mbouwer »

joestue

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Re: Active Pitchcontrol
« Reply #639 on: April 19, 2017, 03:57:03 PM »
if you re-orient the magnets so you have two of them facing each other, an inside and outside cylinder, you can make a radial air core design.

another alternative is use the outside of a large motor core as a slotless core.
there is a photo here of the method.
http://www.fieldlines.com/index.php?topic=143518.0

mbouwer

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Re: Active Pitchcontrol
« Reply #640 on: April 20, 2017, 03:45:04 AM »
It's a pleasure to read all your comments.
Only with your support I'm going to manage to make a radial generator

electrondady1

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Re: Active Pitchcontrol
« Reply #641 on: April 20, 2017, 06:26:26 AM »
you seem to do very nice metal fabrication.
 i don't understand if you have 64 mags with mounting holes and another 64 mags without mounting holes .
why would you not build a dual rotor radial alternator with an air core stator and avoid all the coggeing?

« Last Edit: April 20, 2017, 06:39:40 AM by electrondady1 »

mbouwer

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Re: Active Pitchcontrol
« Reply #642 on: April 20, 2017, 01:13:10 PM »
That's what I will do. Air core stator with 1 layer of coils.
36 magnets and 27 coils.

mbouwer

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Re: Active Pitchcontrol
« Reply #643 on: April 21, 2017, 03:47:52 AM »
The coil winder for the coils with inside measure 20 x 10 mm

« Last Edit: April 21, 2017, 03:54:17 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #644 on: April 22, 2017, 03:11:29 AM »
Coils 100 and 50 windings / wire 0,5 mm
Mounted with the rotor at 100 rounds per minute the biggest coil shows 0,05 volt.

Bigger magnets and coils, thinner wire.....?

« Last Edit: April 22, 2017, 03:26:10 AM by mbouwer »

Adriaan Kragten

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Re: Active Pitchcontrol
« Reply #645 on: April 22, 2017, 06:50:05 AM »
If you use a stator without steel lamination in it, you should use rather thick magnets other wise the magnetic resistance of the air loop wil be rather high with respect to the magnetic resistance of the magnet itself. This will result in a rather low magnet flux flowing through the coils. In my recent report KD 631, I describe an axial flux PM-generator with no iron in the coils and even with 15 mm thick magnets there is a large reduction of the magnetic flux in the coils (see calculations in chapter 3). The same theory can also be used for a radial flux generator.

electrondady1

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Re: Active Pitchcontrol
« Reply #646 on: April 22, 2017, 07:05:16 AM »
dual rotor required
add another rotor on the outside of your present one  with another 32 magnets.
cast a 2 phase stator with overlapping coils
 a total of 64 coils and 64 magnets


electrondady1

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Re: Active Pitchcontrol
« Reply #647 on: April 22, 2017, 08:07:56 AM »
       ......
       :....==coils   
       :
 mag:rotor
       :
       :.....
       :.....==coils
« Last Edit: April 22, 2017, 08:26:43 AM by electrondady1 »