Re: [CAD_CAM_EDM_DRO] Phase converter how-to

the motor on my rotary is 5 hp and weighs 300lbs i dont even use caps to
balance phases, ran 3 hp horizontal mill with it, cul brian f.

----- Original Message -----
From: "metlmunchr" <metlmunchr@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 17, 2004 7:34 PM
Subject: [CAD_CAM_EDM_DRO] Phase converter how-to


> There's an excellent article on the web by Jim Hanrahan about how to
> build a rotary phase converter, including details on how to make it
> self starting and how to size and use capacitors to balance the
> voltage from phase to phase. Google for phase converter and
> hanrahan and you'll find it on any one of several sites.
>
> A few years ago, I talked with a retired EE who spent his career at
> Onan (generator manufacturer). He had built a lot of rotary
> converters and recommended that older motors make far superior
> converters as compared to the newer and lighter ones of the same
> size. He said to look for some big old ugly thing with cast iron
> end bells as opposed to the newer motors with fabricated steel
> housings. I think he said motors made prior to 1960. As I best
> recall, he said as motors have gotten smaller for a given
> horsepower, it has altered the current saturation levels, which
> results in the newer motors being less desirable for converter use.
> Of course, for the hobbyist, older ones are cheaper too, so that's a
> win-win.
>
> Cliff
>
>
>
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