Re: Voltage to steppers

Hi Jan,
I wish I was half as smart as you think I am. I am a mere student
when compared to those such as Mariss and Jon, and you.
I'll tell you what though. The good student that I am, I have
been taking notes from some of the discussions here on CAD_CAM. I
will try to put something together and shoot it on over to you for
evaluation (and possible placement in the CAD_CAM files). Just don't
expect it before the end of the semester though.

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> In a message dated 1/16/2003 10:55:55 AM Central Standard Time,
> xylotex@h... writes:
>
>
> > First, doubling your voltage will significantly increase the
> > performance of your motors. I would definitely recommend going
to
> > 24V if your Allegro parts can handle that. It is most often
> > recommended to run a stepper above it's rated 'running' voltage
(not
> > to be confused with it's MAXIMUM voltage), but you should not run
a
> > motor over it's rated current.
> >
>
> Jeff:
>
> I have forgotten who it was in the group who just asked this
question, but I
> see that now and then in other kinda-related groups, as well. It
is clear
> most folk do NOT understand that having a DC-SUPPLY voltage several
times
> higher than the motor's "rated coil-voltage" does NOT mean "that
same
> [effective] voltage will be applied to the motor"! Well, yes, it
is, but not
> "at stand-still". NO MORE than that rated coil-voltage should be
applied,
> "effectively", so that the rated CURRENT does not exceed! This
concept of
> the increase of coil-REACTANCE when spinning is something most
folk "in here"
> just don't grasp, and this is understandable! (I'm not even sure I
do!!!)
>
> We need someone like YOU to explain about how a CHOPPER-drive
keeps the
> "effective" current at the proper limit, and why the HIGH voltage
the drive
> CHOPS does not cause excessive current (due to DUTY CYCLE of the
chopping)
> and that!
>
> And how the "old" L/R "six-wire" unipolar system was WASTEFUL and
> inefficient, and how a power-supply for a CHOPPER system can be
much smaller
> than the old L/R system, etc., etc! Do YOU volunteer???
>
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]