Re: GECKOS 201

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