RE: [CAD_CAM_EDM_DRO] Re: SLA7062 technical stuff - supply voltages

Stepper motors produce torque (and therefore power when they turn) based on
how much current is flowing through the winding. The step (turn) when
current is removed from one winding and put through the other one. (or the
current flow direction is changed).

The faster you can get up to the rated current the sooner you have your
torque. If you step before the current has reached maximum you obviously
won't have as much torque developed before the next step begins.

Higher voltage means you reach maximum current and therefore maximum torque
faster.

John Dammeyer



Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turyga1963
> Sent: Monday, May 08, 2006 3:21 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: SLA7062 technical stuff -
> supply voltages
>
>
> Dave,
>
> You're right...I wish I hadn't spent so much time looking for a
> transformer that would supply those extra volts!
>
> I think this is valuable information, but I also wonder what the end
> effect is on how the steppers operate?
>
> If a board is rated to 42vdc and you supply only 34vdc or even
> 24vdc, what happens? If you still have the amperage, do the motors
> still turn as fast with as much power? If not, is the effective
> decrease linear?
>
> Tom
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> <dave_mucha@...> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turyga1963" <TIntruder@>
> > wrote:
> > >
> > > Dave,
> > >
> > > Good to know. Problem in my case and I suspect that of many
> others
> > > who have had similar problems is that we were expressly told by
> HCNC
> > > that we could use up to 42vdc and the circuit board is even
> > > silkscreened to show that voltage. Further we were told the
> closer
> > > to 42vdc we got, the better as that would insure maximum
> power/speed
> > > from the steppers.
> > >
> > > Oh well, live and learn...
> > >
> > > Tom
> >
> > I found that many of the parts seem to fit well with existing
> > transformers.
> >
> > a 24V transformer times 1.414 to get 34 volts fits well to a 44
> volt
> > maximum unit.
> >
> > 48 volts to the Gecko offers about 66 volts to the drive. Again a
> > nice fit without leaving too much room for improvement.
> >
> > Some time ago, Mariss posted some results of life expectancy of his
> > drives. at 114 volts the life expectancy was something in the
> minutes
> > range. at 80 volts it was in the years, at 90 it was in the months
> > and only got worse as the voltage increased.
> >
> > I suspect that this is the case with all drives. there is a sweet
> > spot that offers a very long life and a bleeding edge where one
> > mistake, one time results in that sinking feeling you get when you
> > smell that magic smoke.
> >
> > Dave
> >
>
>
>
>
>
>
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