Re: Stepper motors
- From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
- Date: Tue, 30 Oct 2007 12:17:57 -0500
On Mon, 29 Oct 2007 21:03:45 +0000, Periproct wrote:
I'm setting up a small CNC mill to educate myself before taking the plunge
on a larger machine and I have a few questions about the stepper motors and
stepper driver boards.
Firstly, the motors have what looks like 7/0.2 wires attached and according
to the people I bought the machine from they are rated at 2 amps. Surely
that is very fine wire for so high a current.
Secondly, the driver boards have an potentiometer to adjust the current. My
simple mind says the motors will take the current they require or is this
some kind of current limiting.
Lastly, would it be sensible to adjust the boards to a slightly lower
current?
I've set all three boards to 2 amp and already killed one board.
Stepper motors always need to have excess current, so that they have
torque when they need them. This is different from how a DC motor works,
and that's probably what you're thinking of.
As long as your steppers are working correctly you can turn down the
current -- you're setting the available torque, if you've got what you
need plus a safety factor then you're doing OK.
--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com
Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
.
- References:
- Stepper motors
- From: Periproct
- Stepper motors
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