Large heat sink needed

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Large heat sink needed azotic 08-03-2008
Posted by azotic on August 3, 2008, 11:25 pm
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 Does anyone have a heat sink that they want to part with ?

My minimum size requirement would be 6" X 8" or bigger.


I finished my DIY 3-phase VFD and need a large heat sink for the IGBT's.
When i have the heat sink i will be posting a short video of
the VFD in operation. It was a fun project and very educational. I believe
that
building a VFD is well within the capabillities of the folks that hang out
here.
Once i find a freeware schematic program i will produce a schematic and
have it available on the web if anyone is interested in building a VFD. I
have
run some short duration tests using a 7.5hp motor successfully.


Best Regards
Tom.




Posted by Don Foreman on August 3, 2008, 11:47 pm
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>Does anyone have a heat sink that they want to part with ?
>
>My minimum size requirement would be 6" X 8" or bigger.

Wull yah, I got some o' them. They're 6 x 8 sheets of 1/16" aluminum!
You'll have better luck getting what you need if you specify the
thermal resistance to ambient you need (degrees per watt), and whether
or not you'll provide forced air cooling aka a fan.

Check out some of the CPU sinks they have on the surplus market. They
have a bazillion tall but very thin fins. They're not very big, but
with fan cooling they have amazingly low thermal resistance to
ambient.
>
>
>I finished my DIY 3-phase VFD and need a large heat sink for the IGBT's.
>When i have the heat sink i will be posting a short video of
>the VFD in operation. It was a fun project and very educational. I believe
>that
>building a VFD is well within the capabillities of the folks that hang out
>here.
>Once i find a freeware schematic program i will produce a schematic and
>have it available on the web if anyone is interested in building a VFD. I
>have
>run some short duration tests using a 7.5hp motor successfully.

Sounds like an interesting project.

Another project that I think would have a lot of appeal is a VFD-like
device that converts singlephase to threephase, power of maybe 1.5 HP
to 5HP would meet a lot of needs. RPC's do this fairly well and are
cheap where there's a ready source of large 3phase motors, but power
electronics are getting cheap too. It wouldn't need to be VF to be of
interest. It would have a bunch of caps for energy storage but it
would be silent and not take much space.

Posted by azotic on August 4, 2008, 12:28 am
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>
> Sounds like an interesting project.
>
> Another project that I think would have a lot of appeal is a VFD-like
> device that converts singlephase to threephase, power of maybe 1.5 HP
> to 5HP would meet a lot of needs. RPC's do this fairly well and are
> cheap where there's a ready source of large 3phase motors, but power
> electronics are getting cheap too. It wouldn't need to be VF to be of
> interest. It would have a bunch of caps for energy storage but it
> would be silent and not take much space.
>

My VFD design will meet those requirements. The input can be DC from
batteries,
24-220Vac single phase or 3-phase from a rotary converter. I designed the
VFD using standard
CMOS integrated circuits and discrete components. The idea was to keep the
design
simple enough for a hobbyist to build with a minimum skill set in
electronics along
low construction cost. Reapairability was also a concern so all the IC's are
socketed
for easy fixes. The approximate cost of the components for the logic/driver
board is $30.
The IGBT's were scrounged from ebay, i am using 3 DTR units rated at 1200v
100A
which cost me $25 for all 3.

The other neat thing is that with my design you get variable speed and
variable torque
at no extra charge.

Best Regards
Tom.






Posted by azotic on August 4, 2008, 1:46 am
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> Wull yah, I got some o' them. They're 6 x 8 sheets of 1/16" aluminum!
> You'll have better luck getting what you need if you specify the
> thermal resistance to ambient you need (degrees per watt), and whether
> or not you'll provide forced air cooling aka a fan.
>
> Check out some of the CPU sinks they have on the surplus market. They
> have a bazillion tall but very thin fins. They're not very big, but
> with fan cooling they have amazingly low thermal resistance to
> ambient.
>>
>>

If i cant find a suitable heat sink and am forced to build a heat sink thats
the route i will
go. Affix a bunch of BGP heatsinks on an aluminum plate and fashion a tunnel
heat sink with forced air cooling. Really don't want to do that if i can
avoid it.

Best Regards
Tom.




Posted by Den on August 4, 2008, 2:40 am
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>
>> Wull yah, I got some o' them. They're 6 x 8 sheets of 1/16" aluminum!
>> You'll have better luck getting what you need if you specify the
>> thermal resistance to ambient you need (degrees per watt), and whether
>> or not you'll provide forced air cooling aka a fan.
>>
>> Check out some of the CPU sinks they have on the surplus market. They
>> have a bazillion tall but very thin fins. They're not very big, but
>> with fan cooling they have amazingly low thermal resistance to
>> ambient.
>>>
>>>
>
> If i cant find a suitable heat sink and am forced to build a heat sink
> thats the route i will
> go. Affix a bunch of BGP heatsinks on an aluminum plate and fashion a
> tunnel
> heat sink with forced air cooling. Really don't want to do that if i can
> avoid it.
>
> Best Regards
> Tom.
>
>


Is there someone nearby that sells / services car/camping fridges? The
peltier based ones I've salvaged have nice sized ally heatsinks in the back
of them. The cheaper fridges are not worth repair and get thrown in the skip
rather than fixed.




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