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bj

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wind
« on: February 11, 2009, 03:29:11 AM »




As it is so cold, and no shop heat, my wifes kitchen island became the work

shop.  Built two rectifier assemblys.  Have acquired hubs/spindles, SS

allthread/nuts, and a few other goodies.

I was a little worried about the size of the heatsink I used, so used a

piece of 1/4 inch aluminum behind to help spread out the heat.  Will

post more as I get it done.

  bj
« Last Edit: February 11, 2009, 03:29:11 AM by (unknown) »
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bj
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SparWeb

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Re: wind
« Reply #1 on: February 11, 2009, 09:55:25 AM »
Since you're planning a 10-foot diameter mill, I wonder if your rectifiers are up to the task of carrying the current.  I say so because my 8-foot windmill burned out a rectifier block like that last year.  It was installed on a bigger heat-sink than that, though with a sheet of metal in the way, too.  More important: it failed at about 20 Amps, not 35A.  I learned the hard way that the 35 Amp rating comes from cooling the semiconductors unrealistically in factory tests (if any were done).  In real-world conditions, don't exceed 2/3 of the current.  More heat sink buys you more security.  If you were to find a heat sink extrusion, with fins, about 12"x6", you could put that on the outside, and spread some thermal goop thinly over the whole mating surface.


Very neat and tidy, by the way.

« Last Edit: February 11, 2009, 09:55:25 AM by SparWeb »
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TomW

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Re: wind
« Reply #2 on: February 11, 2009, 02:05:04 PM »
Funny;


I just found 2 of them failed on my conversion which explains the low output I had. It had a bridge on each phase [Jerry Rigged].  This is the 3rd time these crap bridges have failed. My heat sinks should be plenty large enough with thermal grease and fins "in the wind" so I have given up on those pieces of crap so called 35 amp bridges as of today.


Just discovered today so I figured I should post. The 3 combined never has seen 20 amps I don't think.


Tom

« Last Edit: February 11, 2009, 02:05:04 PM by TomW »
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vawtman

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Re: wind
« Reply #3 on: February 11, 2009, 06:33:49 PM »
 Nice work Beej

 I know where your coming from i moved into the house also.Do you have any junk cylinder heads from old small engines around?I know a heatsink is probably the farthest thing from your mind when it's -40.


Spring seems to have started to settle in here.


 Have fun has always.

« Last Edit: February 11, 2009, 06:33:49 PM by vawtman »
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TomW

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Re: wind
« Reply #4 on: February 11, 2009, 06:42:30 PM »
bj;


Sorry, meant to toss in a "Nice Job" on my first comment. Very neat.


Tom

« Last Edit: February 11, 2009, 06:42:30 PM by TomW »
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