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Author Topic: 17' Steel Specs  (Read 1724 times)

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nekit

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17' Steel Specs
« on: July 28, 2009, 03:08:53 PM »
I'm in the process of building a 17' machine based on the Otherpower 17'.  I have a few questions on some of the metal specs.  


I have 3/8" thick steel on hand and am wondering if that will work for the 18" Mag Rotors instead of the 1/2" in the plans.  This would keep my costs and weights down.


I also was wondering what the thickness of the steel Blade Hubs are?  I can seem to find it anywhere.


Thanks for any help you can give.

Rob

« Last Edit: July 28, 2009, 03:08:53 PM by (unknown) »
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dlenox

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Re: 17' Steel Specs
« Reply #1 on: July 28, 2009, 09:57:17 AM »
Rob,


I used 1/2" steel for the rotors not 3/8".


The steel blade hubs are made from 1/4" steel, details can be found here.


good luck with your build.

Dan Lenox

« Last Edit: July 28, 2009, 09:57:17 AM by dlenox »
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fabricator

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Re: 17' Steel Specs
« Reply #2 on: July 28, 2009, 04:12:15 PM »
I believe rigidity is very important in a machine this size
« Last Edit: July 28, 2009, 04:12:15 PM by fabricator »
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Watt

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Re: 17' Steel Specs
« Reply #3 on: July 28, 2009, 07:07:24 PM »
I'm not sure but I think that thickness is important for two reasons, rigidity and flux saturation.  
« Last Edit: July 28, 2009, 07:07:24 PM by Watt »
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nekit

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Re: 17' Steel Specs
« Reply #4 on: July 28, 2009, 07:15:04 PM »
I was wondering about the flux saturation too.
« Last Edit: July 28, 2009, 07:15:04 PM by nekit »
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DanB

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Re: 17' Steel Specs
« Reply #5 on: August 02, 2009, 09:11:13 AM »
I would guess that 3/8" steel would probably work for the magnet rotors...  I would prefer half inch stuff.


The blade hubs I made were 1/4" thick.

« Last Edit: August 02, 2009, 09:11:13 AM by DanB »
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Menelaos

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Re: 17' Steel Specs
« Reply #6 on: September 21, 2009, 11:40:45 AM »
You can check out on thickness needed by using a nice tool clles "Femm". You will find it by googleing.


Its also very good and precise on simulating flux density at different air gap setups for variuos size and Grades of magnets. I used it to compute the parameters for my small 7 foot turbine and it worked out really well. The flux denity is one of those secrets... ;-)


With this there is no more need to make test coils, i counterchecked on various generator setups. Also you have a variaty of different kinds of steel to be used. The graphics show the rigidy of the rotors. Results would look like in may threat in a german bord:


http://www.kleinwindanlagen.de/Forum/cf3/attachment_processor.php?mode=implement_file&id=46


This might help you as much as it did help me...Also there are add ons for this tool so that the wiring can be calculatet and simulated as well...which would give you a good guess about the voltages at certain RPM and so on.

Its confusing when used for the first time but a great help


max

« Last Edit: September 21, 2009, 11:40:45 AM by Menelaos »
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