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.

On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:

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.

azotic wrote:
Does anyone have a heat sink that they want to part with ?

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

I'll check, but I just cleaned out some stuff & recycled the big ones.

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.

Cool!

Once i find a freeware schematic program i will produce a schematic...

I've used TinyCAD:
http://tinycad.sourceforge.net/

*Very* basic, but that means a short learning curve. I tried a couple
of others first and cut my losses after a day or so of frustration.
TinyCAD has a Yahoo support group.

Bob

azotic wrote:

(...)

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.

EAGLE!

http://www.cadsoft.de/freeware.htm

--Winifred

"Don Foreman" wrote in message
...
On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:

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.

"Jon Anderson" wrote in message
. ..
azotic wrote:
Does anyone have a heat sink that they want to part with ?

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

I've got a couple approx 6 x 14". I'll be gone in the morning, but can
email a pic in the early afternoon.

Jon


Sounds great, if you could email me the pix at your convience
along with the price you need to get i will be a happy
camper.

Best Regards
Tom.

"Don Foreman" wrote in message
...
On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:
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.

azotic wrote:
Does anyone have a heat sink that they want to part with ?

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

I've got a couple approx 6 x 14". I'll be gone in the
morning, but can email a pic in the early afternoon.

Jon

"azotic" wrote in message
...

"Don Foreman" wrote in message
...
On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:
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.

azotic wrote:
Does anyone have a heat sink that they want to part with ?

My minimum size requirement would be 6" X 8" or bigger.
I have some fancy Wakefield 3.5" wide extrusion, I suppose you
could use two of them side by side. The stuff costs me $18 per
foot.

Jon

azotic wrote:
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.
Very interested in what you have done! Did you use the IR kit
design, or somebody's microcontroller?

I have designed the control logic in an FPGA for a 2-phase motor
on a high-speed spindle, but still have a bunch of testing to do
before it would work.

Jon

On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:

Does anyone have a heat sink that they want to part with ?


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.




Too far away to make shipping sensible, but very interested in your
experience/design. At some point I may need to build a replacement for the $20
16kVA VFD setup that I'm currently abusing for my toys, preferably one where
the star point isn't 175V away from the ground voltage as at present...

regards
Mark Rand
RTFM

"azotic" wrote in message
...
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.

Tom,

I don't have any THAT big, but I could get you a couple pieces of 3" wide
aluminum heat sink.

If I remember right, it has 1/16" think fins with 1/16" spacing...the total
thickness is 1/2" and the fins are 3/8" tall.

If that'll work, I could likely get two 8" long pieces for you.

How much? That's the best part...considering how much steel you gave me a
few years ago, it'd be gratis.

Mike

"The Davenport's" wrote in message
...

"azotic" wrote in message
...
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.

Tom,

I don't have any THAT big, but I could get you a couple pieces of 3" wide
aluminum heat sink.

If I remember right, it has 1/16" think fins with 1/16" spacing...the
total thickness is 1/2" and the fins are 3/8" tall.

If that'll work, I could likely get two 8" long pieces for you.

How much? That's the best part...considering how much steel you gave me a
few years ago, it'd be gratis.

Mike

Oh...I'll get more precise numbers on the size tomorrow.

Mike

"Jon Elson" wrote in message
...
Very interested in what you have done! Did you use the IR kit design, or
somebody's microcontroller?

I have designed the control logic in an FPGA for a 2-phase motor on a
high-speed spindle, but still have a bunch of testing to do before it
would work.

Jon


I don't use a microcontroller. In order to keep it as simple as possible
i use two CMOS chips, 6 opto isolators and 3 IR gate driver chips
driving 3 GTR IGBT's. They idea is to offer an alternative to rotary
phase converters, just a very basic VFD that will work reliably the
first time you apply power.

When i started out on this project my thoughts were that most
people with a home shop only just want to run thier 3 phase machines
and make chips. They may not need or want a lot of bells and whistles
that commercial VFD's offer, they just want 3 phase power. Those
were the design parimeters i used to build my unit with.

I will sometime in the future design a interface that plugs into a
standard PC printer port for people that want to experiment
with controlling 3 phase motors via computer.

Best Regards
Tom.

"The Davenport's" wrote in message
...

"azotic" wrote in message
...
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.

Tom,

I don't have any THAT big, but I could get you a couple pieces of 3" wide
aluminum heat sink.

If I remember right, it has 1/16" think fins with 1/16" spacing...the
total thickness is 1/2" and the fins are 3/8" tall.

If that'll work, I could likely get two 8" long pieces for you.

How much? That's the best part...considering how much steel you gave me a
few years ago, it'd be gratis.

Mike

Thanks for the offer mike, but your heat sinks are to small for my
application.

Best Regards
Tom.

Tom,

Good freeware Schematic capture and PCB layout can be had here.. I've made a
dozen of so PCB's using this
http://www.expressPCB.com/

PCB layout dosen't produce "gerbers" but can be directly sent to ExpressPCB,
and yes for 50 bucks they'll send you a "gerber".

I understand that since ExpressPCB has been "eating their lunch" that good
old Advanced Circuits now offers a free schematic capture and PCB layout
program but I haven't tried them
http://www.4pcb.com/index.php?load=content&page_id=46

I have a 3.5 x 4 x 12 Heat sink off an old analog power supply, I has 9 fins
that run the full 12 inch length and mounting for 8 (4 on each side) TO-3's

What ya got to trade?... I'm alwasy interested in 5C collets...

I'm sure you can figure out how to e-mail me...

--.- Dave


"azotic" wrote in message
...
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.

azotic wrote:
"Jon Elson" wrote in message
...

Very interested in what you have done! Did you use the IR kit design, or
somebody's microcontroller?

I have designed the control logic in an FPGA for a 2-phase motor on a
high-speed spindle, but still have a bunch of testing to do before it
would work.

Jon



I don't use a microcontroller. In order to keep it as simple as possible
i use two CMOS chips, 6 opto isolators and 3 IR gate driver chips
driving 3 GTR IGBT's. They idea is to offer an alternative to rotary
phase converters, just a very basic VFD that will work reliably the
first time you apply power.

When i started out on this project my thoughts were that most
people with a home shop only just want to run thier 3 phase machines
and make chips. They may not need or want a lot of bells and whistles
that commercial VFD's offer, they just want 3 phase power. Those
were the design parimeters i used to build my unit with.
So, is this a 6-step drive that just runs 60 Hz? That really
isn't a "VFD", as you can't vary the frequency without also
varying the effective voltage through PWM. 2 SSI CMOS chips
doesn't sound like it could do that.

Jon

"Jon Elson" wrote in message
...
azotic wrote:
"Jon Elson" wrote in message
...

Very interested in what you have done! Did you use the IR kit design, or
somebody's microcontroller?

I have designed the control logic in an FPGA for a 2-phase motor on a
high-speed spindle, but still have a bunch of testing to do before it
would work.

Jon



I don't use a microcontroller. In order to keep it as simple as possible
i use two CMOS chips, 6 opto isolators and 3 IR gate driver chips
driving 3 GTR IGBT's. They idea is to offer an alternative to rotary
phase converters, just a very basic VFD that will work reliably the
first time you apply power.

When i started out on this project my thoughts were that most
people with a home shop only just want to run thier 3 phase machines
and make chips. They may not need or want a lot of bells and whistles
that commercial VFD's offer, they just want 3 phase power. Those
were the design parimeters i used to build my unit with.
So, is this a 6-step drive that just runs 60 Hz? That really isn't a
"VFD", as you can't vary the frequency without also varying the effective
voltage through PWM. 2 SSI CMOS chips doesn't sound like it could do
that.

Jon


I will be posting a video of the VFD in operation as soon as i have
a heatsink to mount the IGBTs to. The video will show the motor
speed being varied between about 125 Rpm and 1725 Rpm.

Best Regards
Tom.

Bob Engelhardt wrote:
azotic wrote:
Does anyone have a heat sink that they want to part with ?

I'll check, but I just cleaned out some stuff & recycled the big ones.

Nope, they're gone. Sorry.

"Bob Engelhardt" wrote in message
. ..
Bob Engelhardt wrote:
azotic wrote:
Does anyone have a heat sink that they want to part with ?

I'll check, but I just cleaned out some stuff & recycled the big ones.

Nope, they're gone. Sorry.


Thanks anyway.

Best Regards
Tom.

azotic wrote:
"Bob Engelhardt" wrote in message
. ..
Bob Engelhardt wrote:
azotic wrote:
Does anyone have a heat sink that they want to part with ?
I'll check, but I just cleaned out some stuff & recycled the big ones.
Nope, they're gone. Sorry.


Thanks anyway.

Best Regards
Tom.




You still looking for a heatsink? I may have one or two around. I'll
take a look if you wish.

-Al A.

"Al A." wrote in message
. ..



azotic wrote:
"Bob Engelhardt" wrote in message
. ..
Bob Engelhardt wrote:
azotic wrote:
Does anyone have a heat sink that they want to part with ?
I'll check, but I just cleaned out some stuff & recycled the big ones.
Nope, they're gone. Sorry.


Thanks anyway.

Best Regards
Tom.

You still looking for a heatsink? I may have one or two around. I'll take
a look if you wish.

-Al A.


Thank for the offer, another memeber of RCM has sent me a couple of
heatsinks. Hopefully they will be big enough to keep things cool. In case
they are to small i will take dons advice and build one.

Thanks Again.
Tom.

Tom -

I have two hockey Puck heat sinks that are larger and have a nice flat
inside. No holes drilled - one never used the other was on a thermal
stack for a sideways 8 heat sink.

It is likely larger by than your VFD - but a DIY one might not be tiny.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


azotic wrote:
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 via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups
---= - Total Privacy via Encryption =---

"Martin H. Eastburn" wrote in message
...
Tom -

I have two hockey Puck heat sinks that are larger and have a nice flat
inside. No holes drilled - one never used the other was on a thermal
stack for a sideways 8 heat sink.


Thanks for the offer, another RCM member has already provided me with
some very nice big heat sinks.

Thanks Again
Tom.

if you get an old dead stereo you can get one with a fluid heat pipe

much more efficient at moving heat from here to over there


** Posted from http://www.teranews.com **

azotic wrote:



Thank for the offer, another memeber of RCM has sent me a couple of
heatsinks. Hopefully they will be big enough to keep things cool. In case
they are to small i will take dons advice and build one.

Thanks Again.
Tom.


No problem, just trying to "help out the cause" so to speak.
I just stumbled on your post about this the other day, sounds
interesting. I was contemplating doing something similar, never quite
got to it as cheapo VFD's seemed to find me when I needed them.

Have you posted any details anywhere? I would really like to have a
look at what you have done thus far.

Good luck,
AL

"Al A." wrote in message
. ..
azotic wrote:


Have you posted any details anywhere? I would really like to have a look
at what you have done thus far.

Good luck,
AL


I will be posting a video as soon as i have everything mounted on the
big heatsink.

Best Regards
Tom.

On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:


I finished my DIY 3-phase VFD and need a large heat sink for the IGBT's.

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.

Best Regards
Tom.

Tom, did you ever post the schematics?

RWL

GeoLane at PTD dot NET wrote in message
...
On Sun, 3 Aug 2008 20:25:12 -0700, "azotic" wrote:


I finished my DIY 3-phase VFD and need a large heat sink for the IGBT's.

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.

Best Regards
Tom.

Tom, did you ever post the schematics?

RWL


Not yet. Been trying to figure out how to use the schematic software i have.

Best Regards
Tom.