RE: [CAD_CAM_EDM_DRO] VFD's / Skates

My total non-technical understanding of how a VFD works is that it takes the
incoming AC current, converts it to DC and then under the control of a
microprocessor converts it back 3 phase AC at the frequency you have the
unit set for. A VFD does not change the voltage so you have to get on that
matches your input voltage and motor. On all the units I have seen the HP
rating is based upon 3 phase input and you derate the unit by 50% if you are
on 1 phase input.

Tim
[Denver, CO]

> -----Original Message-----
>
> Hello,
>
> My server decided to kick me off for a while so I'm currently
> trying to
> sort that out along with a thousand other problems to do with these
> computers (And to think I used to enjoy using them!). I had a look at some
> VFD's, could someone explain to me how they actually work? I've never seen
> these before. They tell me the voltage and phases they're capable
> of but is
> that the power going in or the power going out? I am looking for
> one roughly
> twice the power I need yes? I am having a time shifting the junk out the
> garage to see how much space I can make, my hands are black with soot from
> the welding torch. One last thing, has anyone seen a web page or
> information
> about making machinery skates? I know I should be using roller
> about 20mm -
> 25mm in diameter but I'd like to see how I should join them to a base and
> other things like how thick the base should be to stop it bending.
>
> Thanks in advance,
>
> John He.
>
>
>
> Addresses:
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