Re: (ET) Deck Motor Alternate Use

[Charlie <medievalist gmail com>]

Why do you need DC for speed control?   My forge blower is a 120vac motor, and when I plug it into my ancient variac I get continuously variable speed on the motor just by turning the knob.

My variac looks like the one in this picture:  http://www.popsci.com/diy/article/2009-10/what-variac

My knowledge of electric motors is empirical and (in my opinion) very weak, so I apologise if the above sounds stupid.  I have no idea what kind of motor is on the forge blower, but it's definitely meant to run 120vac, there's no rectifiers or whatnot at all.

--Charlie

On Wed, Oct 9, 2013 at 12:12 PM, Robert Troll <roberttroll hotmail com> wrote:

i don't need a 120vac motor. Got lots of those. I need a DC motor so i can make it a variable speed drive. In order to make AC variable speed i would need to get a 3ph motor and use a VFD. The DC setup is cheaper.

>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 8 Oct 2013 12:36:40 -0400
> From: Charlie <medievalist gmail com>
> To: Elec-Trak <elec-trak cosmos phy tufts edu>
> Subject: Re: (ET) Deck Motor Alternate Use
> Message-ID:
> <CAJb3uA7jezYoG23aaf3wrqY+J+A43aOinPtiiC7Yi1U5Y6ehYA mail gmail com>
> Content-Type: text/plain; charset="iso-8859-1"

>
> Personally I hope you will give your real ET deck motor to John J., and let
> him buy you a 120VAC motor for your lathe!
>
> I wish I had "spare" 36vdc motors. If I'd picked up every free 12vdc or
> 120vac motor I've been offered over the years I'd have four or five hundred
> of them laying around, but nobody's ever offered me a clean working 36vdc
> motor for less than $120, much less for free.
>
> --Charlie
>

> ******************************************

_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak