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the biggest 3 phase rectifier ive built to date. :-)


By electronbaby, Section Homebrewed Electricity
Posted on Mon Sep 27th, 2004 at 06:55:55 PM MST
check this out.

sorry i havent been on the board lately. ive been in the process of attempting to build a house for myself. its been tedious work to say the least.  :-P  

anyway,... just would like to share some pics of a 3 phase rectifier i just built up last week. this will be used for the big 24v machine at the new house, when the tower finally goes up.  :-P  its built like a tank and should handle a good amount of current. if in the end i feel the need to allow it to cool better, ill just add more aluminum. i have a ton laying around.
 

here is a view of the anode side.



and the cathode side. i used a 3 foot long piece of recycled plastic board type material available at home depot for like $6  think. the rest of the materials i have been lucky enough to collect over the last 6 months.



here is a shot of one of the diodes sitting next to a quarter for a size comparison. they are big. this 3 phase rectifier uses 6 diodes like this. They have 2AWG jumpers on the anode side. I think they are 200A diodes. but dont quote me on it, i never had the time to cross reference them.



here is the input terminals for the power coming from the turbine. I used 4awg cable to wire this up. i figured at 24v it should be enough. i can always change it to a heavier gauge if its not sufficient. i think it wil be fine however... time will tell.



here is a top view. you can see my feet in the picture.

sorry if any of this is vague. I didnt have alot of time to write this up. thought you would enjoy the pics.  :-)

have fun!!
RoyR

the biggest 3 phase rectifier ive built to date. :-) | 7 comments (7 topical, 0 editorial)

Re: the biggest 3 phase rectifier ive built (3.00 / 0) (#1)
by Electric Ed on Mon Sep 27th, 2004 at 07:11:41 PM MST
(User Info) http://www.electric-ed.com

Hey, that is a big one. Nice job!

I hope you locate it where the heat dissipated won't be wasted. You could heat a small room with that baby. :-)

EE



Re: the biggest 3 phase rectifier ive built (3.00 / 0) (#2)
by hiker (hiker.wild[at]yahoo[dot]com) on Mon Sep 27th, 2004 at 07:50:00 PM MST
(User Info)

whats the expected amps?
WILD IN ALASKA
[ Parent ]


Re: the biggest 3 phase rectifier ive built (3.00 / 0) (#4)
by DanB (danb@*no spam*otherpower.com) on Mon Sep 27th, 2004 at 08:10:47 PM MST
(User Info) http://www.otherpower.com/

Roy may have tested his alternator...
Its very similar to these: http://www.otherpower.com/bigmills3.html
Matt's sports a 15' prop, and on windy days we see it pegging the 80 amp meter.  I dont believe the alternator could hold up to too much more than 80 amps @ 24 volts for *long*.  That would be about maximum output Im guessing.  I have the same thing, running at 12 volts and it occasionally pegs my 150 amp meter, though it all runs a bit more efficiently at 24 volts.

I dont think Roy needs to worry about his rectifiers overheating here...

[ Parent ]



Re: the biggest 3 phase rectifier ive built to dat (3.00 / 0) (#3)
by DanB (danb@*no spam*otherpower.com) on Mon Sep 27th, 2004 at 07:51:37 PM MST
(User Info) http://www.otherpower.com/

Geez....
I wish I could show you a picture right now of the rectifer block we used on Matt's very similar 15' machine.

On windy days - it gets pretty toasty, and I worry a bit about it...
I doubt you'll have those worries!

Nice to see you back here Roy!  Hope you pop in more often.



Re: the biggest 3 phase rectifier ive built to dat (3.00 / 0) (#5)
by Flux on Tue Sep 28th, 2004 at 01:28:44 AM MST
(User Info)

Nice one Roy, would do a 300A welder justice.

Watch where you mount it, I bet it will get up to 30 degrees.

Those diodes will be at least 200A.

Flux

[ Parent ]



Re: the biggest 3 phase rectifier ive built to dat (3.00 / 0) (#6)
by JW on Tue Sep 28th, 2004 at 09:42:36 AM MST
(User Info)

Nice job Roy,

 I noticed the heatsinks are not electrically isolated(from the diodes). Take measures so that in the unlikely event a screwdriver or wrench falls on top, full current output is not shorted beween the rectifier segments.

JW

[ Parent ]



wow (3.00 / 0) (#7)
by ghurd on Tue Sep 28th, 2004 at 04:30:16 PM MST
(User Info)

Yikes!

I can't imagine making this much power!
Nice.

  1. things.
  2. I WOULD check for the falling screwdriver situation. Al melts before screwdrivers or cresent wrenches.  A daed battery and a cresent wrench will melt the terminals. I know that from experience. Uhh, I mean, somebody once told me that. ;)
  3. Could some malfunction produce enought V to jump the gap between them? Just a thought. I don't know.
  4. 200a diodes, 6a diodes, 1a diodes... They have a much lower Vdrop at much lower currents.  I have tested 15 cent 6a diodes taking 1/4 or 1/8 amp at only 0.3v forward drop!  Similar results with 3a and 1a diodes.  Nothing precise, but I would expect the same with these.  Low wind, low power, resulting in less loss and more charging.  Thats all good, right?
Parts. Those "Everything's-A-Dollar" China junk stores around here have some 12 and 18" Al. levels. I-beam construction. Good for heat sink in some applications.

G-




the biggest 3 phase rectifier ive built to date. :-) | 7 comments (7 topical, 0 editorial)
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