Re: [CAD_CAM_EDM_DRO] Re: Power supply for Servos - bridge and caps

Brady, I'm using 3caps @ 100 volt and 15k uF each for a total of 45k per Marriss.

Ron

braidmeister <braidmeister@...> 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"
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
>

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

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