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Forum Index : Windmills : Axial flux setup

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itsandbits1
Regular Member

Joined: 13/08/2010
Location: Canada
Posts: 81
Posted: 03:06am 13 Sep 2010
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The wedgies give you about 15% more efficiency

or should i just go with the 1/4" thick wedge shape mags? some say they are better than the 2x1x1/2 's
 
Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 04:41am 13 Sep 2010
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Take my advice and please yourself.

I would have thought the thicker the magnet the greater the power regardless the shape.

With the wedgies (i thought that was something that happened to your underpants) have you considered the allowable coil size they will permit as the dia of the magnet area will be a fixed size and the coils will need to fit into this area.

Pete.
Sometimes it just works
 
Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 10:05am 14 Sep 2010
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Klaus,

[quote]Motor winders do pre heat the wound stator/ rotor, then impregnate the windings with resin (usually by brush) and cure the lot in an oven. Its a time proven method and I think I will contact the local shop to see if this resin can be got in one liter tins. I do have an old oven in the shed that would do nicely for the curing process.
Of course, this method does not create a coil mould, just the windings are sealed together very firmly. It would then be simple to place the sealed coils into the mould and make a stator plate for an AXFX.
[/quote]

I was at my mates place today that winds ignition systems for motorbikes and asked what the high temp resin was he uses for impregnating the coils.

It is called.......ISONEL 51.......and baked at 140C.

He said there is lots of different types and its all a matter of what you want to pay and what temp range you need for the coils to operate in.

Pete.
Sometimes it just works
 
Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904
Posted: 10:55am 14 Sep 2010
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Thanks for that info Pete, I'll do a google search to see where I can get it.
Baking at 140C is doable in my little oven. The local glass & resin shop has a special black epoxy used to encapsulate electrical parts which might be suitable to house the complete (individually sealed) coil assembly.
Anyway, have other things on my plate at the moment and more windmill tinkering can't happen until I get the boat out of my shed again...
Klaus
Klaus
 
itsandbits1
Regular Member

Joined: 13/08/2010
Location: Canada
Posts: 81
Posted: 04:23pm 14 Sep 2010
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Yeah, but you get stuck in the mud too deep sometimes a little wedgie might help lift you out- LOL
yes the magnet thickness is the big increase but the magnet shape can get aother 15% he asked,I answered. It's a little bit of a job to shape the coils but you're supposed to get a sharper cut with the flux over the coil; less cancellation, and it takes up no more space.

  Downwind said   Take my advice and please yourself.

I would have thought the thicker the magnet the greater the power regardless the shape.

With the wedgies (i thought that was something that happened to your underpants) have you considered the allowable coil size they will permit as the dia of the magnet area will be a fixed size and the coils will need to fit into this area.

Pete.
 
Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 10:15am 19 Sep 2010
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Just to follow on with coils impregnated with resin, i cut a coil in half that was vacuum impregnated after winding to see how well the resin had saturated the coil.

It was only a test coil with rubbish secondhand wire so was never any good as a usefull coil anyway.

The resin had penatrated the coil completely, but is a little hard to see in the photo.

The strands that have parted was from the hacksaw catching them when i cut it.




Pete.
Sometimes it just works
 
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