Re: [CAD_CAM_EDM_DRO] 3-Phase motor running from Single Phase Supply ?

OK, you're right; let me be a little more precise. You can have a
total horsepower running of 2 - 3 times the one idler. In my setup, I
could go 15-20, but I'm on a 30A circuit, so that's unlikely. I did
say "as you have capacity for" without defining that, so I have an out :-)

See http://www.metalwebnews.com/howto/ph-conv/ph-conv.html for a
pretty complete discussion of phase converters.

The key is the other machines add to the idler capacity. For example,
when I had a 5hp idler, I couldn't start my lathe at top speed unless
I also had the mill running.

Paul

>
> This is not exactly true! Try running about 5 of those 5HP motors under
> load at the same time with that 7.5 HP phase converter. Even the
> manufacturers of commercial phase converters will tell you there is a limit
> to how much load can be applied to any given phase converter. If there
> wasn't a limit, the manufactures would only build one size...make it small
> as possible and then sell it for the maxium price.
>
> Smoke
>
> >Actually, with a rotary converter, it just needs to be big enough to
> >start and run your largest machine. Once you get that running, you
> >can turn on as many other 3 phase items as you have capacity for. The
> >other machines act as additional idlers.
> >
> >If you're using run caps, it won't balance out as nicely, but it will
> >work fine. I run my 5 hp lathe all of the time when the 5 hp air
> >compressor is chugging away (I have a 7.5 hp idler in my phase converter).
> >
> > Paul
> >
> >--
> >Paul Amaranth | Rochester MI, USA
> >Aurora Group, Inc. | Systems & Software
> >paul@... | Unix / Windows / NT
> >
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--
Paul Amaranth | Rochester MI, USA
Aurora Group, Inc. | Systems & Software
paul@... | Unix / Windows / NT