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John Deere Tractors Discussion Forum
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Crum - 3 Phase Converter

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Bill

11-09-2003 23:00:54




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Crum,I read your post a few days ago about using a 3 phase motor to make a converter. Have a mill that is 3phase and am in need of converter. How big of a motor do you need to run a 5hp motor and can someone with basic electical savy make one? And if so where can I find out how.Thanks Bill




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Bus Driver

11-10-2003 04:26:40




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 Re: Crum - 3 Phase Converter in reply to Bill, 11-09-2003 23:00:54  
There are significant advantages to using a VFD for this purpose. New ones are sold on eBay. For technical information, use Google and type in "VFD".



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Crum

11-10-2003 07:53:52




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 Re: Re: Crum - 3 Phase Converter in reply to Bus Driver, 11-10-2003 04:26:40  
A roto phase is a good system especially if you will be running several motors at once. My roto was built by a small operation in Ephrata Pa. But there are several types and sizes available commercially. There are ads in most farm publications every month, be prepared for sticker shock, to set up the entire system correctly and to code isn't cheap. My advise if you intend to run only 1 or 2 motors at a time is to get a phase-o-matic static converter, one for your 5 horse motor can probably be had for under $200 from Enco. www.use-enco.com. As far as using a VFD (variable frequency drive) with a phase converter, I've never got a definitive answer on this, some say it will work, most say it won't, due to the idiosyncrasies of the generated leg, so I've never tried it. Maybe someone can add some words of wisdom (yea I've tried that)
to this discussion. I'd be real happy if I could use a VFD in some of my applications, the prices of these have gotten down to the point were they can be had reasonable. Our power company would have been happy to bring in true 3 phase if I was willing to pay $20,000 up front for the installation of the lines from the sub-station 2 miles away.

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buickanddeere

11-10-2003 19:23:20




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 Re: Re: Re: Crum - 3 Phase Converter in reply to Crum, 11-10-2003 07:53:52  
I agree. we find the new vfd's more efficient,cheaper, smaller,lighter,safer and produce better quality power. Plus the variable speed ability can be handy.



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