On 7/11/22 12:34, Jon Elson wrote:
Hello,
Is anyone else using AMC 30A20 servo amps? I now have two of these,
waiting for another one to show up on eBay for a decent price. How
hot do these run? The first one I got had no heat sink, the 2nd one
had a heat sink with gigantic fins 1" tall. But, there was no heat
sink grease on that one, which is kind of crazy. So, I'm wondering if
I even need a heat sink? I do have some heat sink extrusion that is
just the right width, and the fins are not so tall, so I can pack the
amps closer together. The datasheet shows 143 W dissipation at
continuous rated output current, but I wonder how that averages out in
typical milling machine applications?
Any thoughts?
Thanks,
Jon
In the FWIW category Jon, 143 watts at full song says they almost have
to be ancient analog designs.
With electrolytic caps that are probably well past their use by date.
Whereas your own pwm-servo I've got 3 of, doesn't run anywhere near that
much heat in normal
operation spinning a spindle motor. Ultrasonic switch mode stuff doesn't
make a lot of heat.
I don't want to guess at the knee weight on the b-port, but the xy
can be handled with a pair of
the 3NM 3 phase stepper/servo's, by direct drive to the screw. Ought to
be able to get 100 IPM for
rapids.
Are you going to motorize the quill too? It can move faster than the
knee in most cases but with
limited travel.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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