Re: [ATM] DC Motor for grinding machine question

[GARY FUCHS <gary@rcn.com>]

Don,

Thanks - that's a potentially very appealing solution. 3 phase motors are cheap and easy to come by at the scrap yard, but the VFD units I saw on ebay vary a lot in price and specs.

Could you suggest what specs to look for that would be appropriate for say a 1 - 2HP 3ph motor running a medium sized (16" - 24"?) turntable and maybe also for a mini lathe and benchtop size (not mini) mill?

Thank you,

Gary Fuchs



---- Original message ----
>Date: Thu, 9 Nov 2006 17:29:52 -0800
>From: "Don Clement" <don_clement@charter.net>  
>Subject: Re: [ATM] DC Motor for grinding machine question  
>To: <atm@atmlist.net>
>
>An alternative to DC motor to control speed is to use a VFD (variable
>frequency drive) and three phase motor. VFD drives are in common use now in
>machine tools like lathes and mills. A three phase motor with a VFD drive
>does not need a three phase power source and is as smooth as a DC motor but
>without the trouble prone brushes and commutator.  VFD drives can be found
>here: http://www.electricmotorsale.com/variable-frequency-drives.html
>
> Used three phase motors in the 1-5hp range are in common use and easily
>found. Since a three phase motor has no brushes, commutator, or slip rings,
>or starting circuit to break or wear out, a used motor that works is a good
>bet to find.
>
>
>
>Don Clement
>
>Running Springs, California
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