[SwampDonkey]

These large Aerotech 1000DC servos have enormous amounts of torque and are extremely hungry for amperage to drive that torque.



801 0Z-IN/AMP
Cont. TRQ: 960oz-in
Peak TRQ: 4500oz-in
3V/KRPM


Are there any commercial drives that can run such a low voltage/ high amperage servo?

[Al_The_Man]

Are you positive they are 3v/krpm?
I have never seen a motor that size with that low a voltage.
In my Aerotech Cat. they show 160v bus volts for that motor, max rpm 2700.
Aerotech make drive for it of course, so does A-M-C. but analogue control.
Al.

[SwampDonkey]

Are you positive they are 3v/krpm?
I have never seen a motor that size with that low a voltage.
In my Aerotech Cat. they show 160v bus volts for that motor, max rpm 2700.
Aerotech make drive for it of course, so does A-M-C. but analogue control.
Al.

Thats what the label says but it makes no sense to me either. I'll hook it up to a power supply and see what we get. I'd love to run them at 60-160DC as a small lathe or mill spindle. Im replacing the weird tach/encoders with some quality incrementals with index.

[jalessi]

The 3V/krpm is the tachometer output spec.

Jeff...

[jalessi]

SwampDonkey,

I believe the model you have is a "1960DC"

Jeff...

[Tkamsker]

but 160 v is not the world as well ,.. how much did that servo cost ?


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[Al_The_Man]

The 3V/krpm is the tachometer output spec.

Jeff...

Makes sense!
Al.

[SwampDonkey]

but 160 v is not the world as well ,.. how much did that servo cost ?



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I have 3, and got a special deal on them. Ive ordered some nice new Heidenhain ERN 471 5000 encoders to replace the odd tach/coders they come with. Something tells me the drives would be a tough combo to find. The plan was to swap the steppers on my Tormach with servos. With Pathpilot being a LinuxCNC interface and the 5i25 card, I could close the loop with a daughter card. I already have linear scales. Im considering totally closing the loop. The Aerotech DC servos will likely be sold to someone with a larger mill that can get some real use out of them.
Unfortunately, these servos are a bit large for this application. They would work, but smaller AC or brushless servos make much more sense. Im curious as to how some 400W panasonic AC servos would do for the X/Y axis.

[Al_The_Man]

Make a good spindle motor!
Al.

[rokag3]

This one look as a good customer for HP UHU http://www.cnczone.com/forums/uhu-se...-hp-uhu-2.html

If you want to use a linear encoder you must not have backlash or the backlash must be smaller than the resolution of the encoder. Also the mechanical fixation of the encoder must be done with great care to avoid instability. A 5 micron step (20 micron line) is the most simple implementation, because of those big steps the PID will not be very nervous, experience show that it work VERY well .

The Graal will be a linear encoder for the position and a rotary encoder integrated (arduino?) to make a pseudo encoder, to be done....