RE: [CAD_CAM_EDM_DRO] Re: GECKOS 201

I would think it would work, but the other experts here may tell you
different. In my book, there is one way to find out, try it.

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia

> -----Original Message-----
> From: ralaco [mailto:ralaco@...]
> Sent: Wednesday, November 27, 2002 11:37 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: GECKOS 201
>
>
> Dave:
>
> Sorry I insist.
>
> I can't find a capacitor that big here in Monterrey, Mexico.
> I'm running another machine with 3 4amp motors, with a 36 volts 10
> amp Microkinetics Power Supply which has a 50 volts 6800 uF
> capacitor, and it's running for more than a year very smooth, with no
> problem.
> I can't use this power supply to run 4 4amp motors so I have to make
> my own Power supply.
> I found a 63 volts 10,000amp capacitor and I don't know if can do the
> job as well as the microkinetics Power Supply.
>
> Regards
>
> Raul Lara
>
>
> --- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...> wrote:
> > Hi Raul,
> >
> > You mentioned 4 motors, 4 amps each.
> >
> > the post you quoted listed 7,500uF per motor, you have either 3 or
> 4
> > motors so multiply 7,500 times # of motors for the 48V power supply.
> >
> > the correct formula is as I listed and that would wind up with
> > 36 volt supply = 8,889uF
> > 48v = 6,667uF
> >
> > Get the next larger cap, I assume Mariss posted 7,500 as it is a
> > standard size.
> >
> > Like I said, check the Gecko paper and the calculation.
> >
> > Dave
> >
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "ralaco" <ralaco@y...> wrote:
> > > Dave:
> > > Why do you talk about 4 times the amp in the formulation.
> > >
> > > Masriss posted:
> > > If you are running 3 of these motors, the maximum current draw
> from
> > > the supply will be 4.5A (3 times 4.5A / 3 for series wired).
> Using
> > > 80,000 times 4.5A / 48V yields 7,500uF. Go with anything between
> > that
> > > and 15,000uF. At 48VDC, use a 63V
> > >
> > > Raul Lara
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...>
> > wrote:
> > > > Hi Raul,
> > > >
> > > > yes, it is that simple, or even simplier.
> > > >
> > > > you only need to meet 66% of the total amps. Check out the
> tech
> > > > sheets at geckodrive.com. There is one on steppers and power
> > > > supplies. pretty much says it all.
> > > >
> > > > but, to check your capacitor selection, I think you need more
> > like
> > > > 40,000uF for the total motors. (OK, 35,566uF)
> > > >
> > > > From the geckodrive site and posted on this list a few times;
> > > > "(C= (80,000 * I) / V)). C is the value in microfarads."
> > > >
> > > > Dave
> > > >
> > > >
> > > > --- In CAD_CAM_EDM_DRO@y..., "ralaco" <ralaco@y...> wrote:
> > > > > The power supply to run 4 4amp stepper motors with Geckos 201.
> > > > > Can it be made with a 36 volts 16 amp transformer, a bridge
> > > > rectifier
> > > > > and the same 10,000uF 63VDC capacitor?
> > > > >
> > > > > Raul Lara
>
>
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