Re: loosing steps

Gene,

Whose drives are you using?

At what speed (full steps per second) are loosing steps? If it is at
low speeds (below 600 full steps per second), a higher voltage will
not help. At higher speeds the motor will simply stall and not finish
the move.

Are you sure you are using the correct phase current?

Describe your power supply. What size filter capacitor (uF)? Current
rating of the transformer?

Unless you are meaning to overheat and damage your motor, please
observe the "nebulous" 20-25 voltage ratio. It was arrived at by
testing many many motors instrumented with thermocouples and
measuring dissipated power versus supply voltage.

Mariss

--- In CAD_CAM_EDM_DRO@y..., Gene <capper@i...> wrote:
> 8 wire motors in parallel
>
> Jon Elson wrote:
> >
> > Gene wrote:
> >
> > > If I turn it up much it will go over the 20-25 voltage ratio
> >
> > So, it is more important to satisfy a nebulous ratio handed down
> > from who knows where, than to have a system that performs to
> > your needs.
> >
> > Do you know what will happen if you exceed this ratio? probably,
> > nothing. At worst, the motors will run a little warmer. Check
> > with Mariss if you are using Gecko drives, but I suspect that if
the
> > driver is rated for higher voltage, there will be no harm in
testing
> > that way. If the motors get too warm for your liking, you can
> > look into other motors and other solutions. But really, the
> > fundamental differences between running a 2 V winding motor
> > at 40 V and 70 V should not be very significant. The 70 V
> > power supply should allow you to go nearly twice as fast before
> > losing steps.
> >
> > Are these 4 , 6 or 8 wire motors?
> >
> > Jon
> >
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