Re: Power supply for Servos - bridge and caps

--- 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