Re: Power supply for Servos - bridge and caps

So are my calculations correct?

If what you're saying is on target then: 26A * 1000uF = 26,000uF

Therefore 3X 10,000uF would yield 30,000uF ~ an extra 3,000uF

Too much, too little, too late?

-Brady

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
> Well Brady, FWIW Rutex recomends 1000uf, or more, per amp of
> supply current.
>
> Scott
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
> <braidmeister@y...> wrote:
> >
> > Thanks Dave.
> >
> > I am guessing (being electronically impared) that I will need 3

of

> > the P10038-ND caps to make 30,000 (27,000)...RIght?
> >
> > -Brady
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> > <dave_mucha@y...> wrote:
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
> > > <braidmeister@y...> wrote:
> > > >
> > > > Yeah...I am curious about this too. I will be running the
> > identical
> > > > motors on my BP. 4 of them counting the 4th axis/Indexer,
> > although
> > > I
> > > > believe that it will still only be running 3 at a time.
> > > >
> > > > My target voltage is about 75v running 100v/20A Rutex 990s.
> > > >
> > > > If my calculations are correct, I should have something like
> this:
> > > >
> > > > 2X Toroid 1KVA 55V ---> 36A @ 55v
> > > >
> > > > Bridge Rectified to 53.8v
> > > >
> > > > 27,000mfd 100v Cap --> 76vdc @ 26A
> > > >
> > > > Using the "formula" C = (80,000 * I) / V then...
> > > >
> > > > C = (80,000 * 26A) / 76volts
> > > >
> > > > C = 27,368
> > > >
> > > >
> > > > Is this correct???
> > > >
> > > > Next thing is...Where do I get the components for this?
> > > >
> > > > What specs should the Bridge Rectifier be?
> > > >
> > > > Thanks!
> > > > -Brady
> > >
> > > It looks like a Bridge from Digi-key, MP504WMS-ND
> > >
> > > $6.40 50 amps, 400V
> > >
> > > Capacitors, 10,000uF 100 volts
> > > $11.96 each P10038-ND
> > >
> > > The bridge rectifiers cost the same for 100,200,300 and 400 so

I

> > just
> > > picked 400 for kicks.
> > >
> > > This is probably what I will be going with.
> > >
> > > Dave