RE: [CAD_CAM_EDM_DRO] Vexta, powermax, stepper voltage question??????

I have had a number of Vexta motors that were rated at 2 - 3 volts.
Looking at a PacSci Powermax II sitting in front of me it has a volt
rating on it that says 65 v, but from having run it at 24 v I would have
to venture a guess that the rating is done a different way than most
other motors. On most motors the rated voltage is that at which you
would get a current draw equal to the rated amperage if the supply is
just hooked directly to the motor without any current limiting. Seems on
the Powermax the rated voltage is more like the max voltage you would
use with a chopper drive limiting the current to the rated level. I know
this specific Powermax motor is just flying on a 24 v supply and an API
CMD-260 drive.

So in summary, the Vexta appears to be a high inductance motor like you
would find in many copy machines. The Powermax is much more likely a
very nive low inductance unit and basted upon the one I have I would not
exceed the 65 v supply level and it will probably run great on much
lower voltage.

Tim
[Denver, CO]

> -----Original Message-----
> From: RC [mailto:asdf@...]
> Sent: Sunday, April 07, 2002 9:49 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Vexta, powermax, stepper voltage
> question??????
>
>
> Does anyone know why Vexta, powermax, ect. have such a high
> rated voltage? For an example, a Vexta #268-23B is rated at
> 24 volts and powermax are rated as high as 65 volts? Is this
> the maximum or average voltages for these steppers? I know
> one needs to supply at least 4 times the rated voltage, and
> not more than 25 times the rated voltage, but that would be a
> very expensive power supply!
>
> Thanks,
> Russ
>
>
> [Non-text portions of this message have been removed]
>
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