Re: [CAD_CAM_EDM_DRO] newbe needs help?

In a message dated 5/30/2003 9:14:16 PM Central Standard Time, JanRwl@...
writes:

> Capacitors? I generally figure 1000 uF per amp. For motor-powering, not
> super-hi-fi audio, that is sufficient. So, you'd need a 11,000 uF
> capacitor.
> There is NO such thing, so, go for 12 or 15K. Possibly, a 10,000 uF might
> do
> "if you never TELL anyone!" (Seriously!)

Baz:

I was just reminded of Mariss' formula for calculating the size of a
filter-cap for stepper-PSU:

He does it this way C = 80000 * I Where C is in µF, I in
E amps; and E in
volts DC.

That'd give you nearly twice the 1000 µF I suggested at first. Some may
consider 18,750 µF for 11.25 amps excessive; some perhaps not. Capacitors are
cheap. It shouldn't bankrupt you to use 2K per amp!

Sorry for the confusion.


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