Re: Re Power Supply

Only a relatively small (10,000uF) cap is needed. Most alternators
are 3-phase rectified. That limits ripple voltage to 13% with no cap
if my trigonometry is correct.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
<rtellason@b...> wrote:

>
> On Friday 16 December 2005 06:35 am, roboticscnc wrote:
> > Just a thought, has anyone used an old car alternator belt driven

off

> > the lathe spindle motor ? The cost would be virtually nothing and

you

> > could run 2 in series for 24 volts. The only dissadvantage I can

see

> > is that you couldn't test toolpaths without the spindle running.

Would

> > any other equipment be needed ( capacitor, etc. )
>
> You don't need two in series, particularly if you're dealing with

the mopar

> alternators that use an external regulator -- the output voltage is
> completely controlled by what's done with the field winding, and

can go

> quite high, 24 volts not being a problem at all.
>
> Capacitor? Well, yeah, at least. The normal setup is for the

battery

> that's being charged to stabilize the voltage somewhat. You

wouldn't need

> that much of a battery to do so, but then you wouldn't want to

overcharge

> one continually either.
>
> There's a fair amount of stuff out there on the 'net in the

alternate energy

> context, a google search will surely return a lot of it.
>
> --
> Member of the toughest, meanest, deadliest, most unrelenting -- and
> ablest -- form of life in this section of space, a critter that can
> be killed but can't be tamed. --Robert A. Heinlein, "The Puppet

Masters"

> -
> Information is more dangerous than cannon to a society ruled by

lies. --James

> M Dakin
>