Re: loosing steps

Gene,

One winding goes to 3,4 and the other winding goes to 5,6. It makes
no difference if 3 and 4 are interchanged (or 5 and 6). All that will
happen is the direction will change.

What is a medium speed? When you say it skips, does the motor stall
or does it keep running? From where are you getting the +5VDC that
goes to terminal 10?

If you want to, give me a call at 714-771-1662. That might be quicker.

Mariss

--- In CAD_CAM_EDM_DRO@y..., Gene <capper@i...> wrote:
> I'm using gecko 201 drives. Phase current is 82k for 4.5 amp motor.
> transformer is rated at 10 amps. cap is 20000 uf. I can set the
> transformer at 40 volts or 70 volts. It does all right at slow
speeds.
> at medium speed it skips. the only thing im not sure about is the
order
> the 2 A phase and 2 B phase are connected to the geckos.does each
phase
> have a + or - ?
>
> mariss92705 wrote:
> >
> > 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
> > > >
> > > > Addresses:
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it if you have trouble.
> > http://www.metalworking.com/news_servers.html
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> > http://groups.yahoo.com/group/jobshophomeshop I consider this
as a sister site to the CCED group, as many of the same members are
there, for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
EXCEPTIONS........
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