Re: CNC Stepper Power Supply Q's???

No that was excellent. So from what your paper stated, and near as I
can tell what I want is about a 50 VAC output from the transformer
and roughly a 750 VA Transformer since the motors are 6.2 Amp motors.

So we get 6.2 * 3 = 18.6 Amps * .667 = 12.4 Amps
12.4 Amps * 50 Volts = 620 VA Or should I multiply by 70?

As for the Capacitor It appears that I need

(80000 * 12.4)/70 = 14,171 uF of capacitance at 70 Volts. Apparantly
there is no penalty for having more capacitance than required?

Finally should the Bridge Rectifier be rated on the Input Voltage or
Output Voltage, I assume output voltage?

Thanks,

Mark





-- In CAD_CAM_EDM_DRO@y..., "Robert Campbell" <bob@c...> wrote:

> Mark,
>
> I have some information on my web page at www.campbelldesigns.com

that may

> help you with your power supply. If that is not enough, I have

another page

> from my CNC router plans.
>
> Bob Campbell
>
> ----- Original Message -----
> From: "Mark" <markatswat@y...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Monday, September 23, 2002 8:11 PM
> Subject: [CAD_CAM_EDM_DRO] CNC Stepper Power Supply Q's???
>
>
> >
> > I think I get it, but lets start with the Basics.
> >
> > 1. More Voltage means More RPM.
> > 2. More Amperage means More Torque.
> >
> > So now I know that my Series 1 was equipped with 8.2 Amp 56V
> > steppers. I want to obviously come as close as I can to those

numbers

> > or possibly exceed them. Right???
> >
> > So I am going to use Gecko's, this much I do know at this point.
> > However I will loose some torque because the Gecko's can only

sustain

> > 7 AMPs. However will I gain some RPM because I can run 72V to the
> > motors???
> >
> > Finally, I have never built a power supply before, does anyone

have a

> > good resource or page to help me along?
> >
> >
> > Mark
> >
> > PS - I know I am contributing like ZERO so far, but as I learn I
> > promise I will start answering questions. It's a steep learning

curve

> > when you don't have anyone local to help show you the ropes!
> >
> >
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to

reach it if

> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this

as a

> sister site to the CCED group, as many of the same members are

there, for OT

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