Re: [CAD_CAM_EDM_DRO] Re: loosing steps

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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> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> 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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>
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