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Re: Looking for motor
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To: tesla-at-pupman-dot-com
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Subject: Re: Looking for motor
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From: Terry Fritz <twftesla-at-uswest-dot-net>
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Date: Tue, 05 Oct 1999 21:01:38 -0600
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Approved: twftesla-at-uswest-dot-net
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Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme
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In-Reply-To: <19991005233231.10237.rocketmail-at-web118.yahoomail-dot-com>
Hi Rodney,
Fractional horsepower sync motors can be bought but you will save a ton of
money just making you own out of a standard AC induction motor. The
"plans" for the conversion can be found at:
www.peakpeak-dot-com/~terryf/tesla/misc/syncmot.zip
Sync motors like to run warm. So I would get one about twice the
horsepower rating you think you will need. When you grind the flats in the
rotor, the no load current goes up but the horsepower goes down. I use a
1/4HP with a 10 inch rotor with no problem. I would stick with 1800 RPM
and avoid trying for 3600 RPM. 3600 is so fast that you need really good
machining and balance while 1800 RPM is more forgiving. I ground my rotor
with and angle grinder by hand with no problem and it runs very smoothly.
But I was very careful.
Cheers,
Terry
Cheers,
Terry
At 04:32 PM 10/05/1999 -0700, you wrote:
>Howdy fellow coilers,
>
>It seems that the last time I fired up my coil, my
>motor was fine but my variac arced to the RSG. Some
>details:
>
>1 hp universal motor at 10,000 rpm,
>0 to 120v 25 amp variac,
>14 inch G10 rotor with 12 25/32 brass inserts that
>hold 1/2" tugston electrodes
>
>The problem is I am having trouble attaining greater
>than 1800 rpms on the rotary. I'm thinking this might
>be due to the tourque band of the motor. It probably
>is one hp at 10,000 rpms and is unable to overcome the
>weight of the rotor rpms. What I'm looking to do, is
>construct a syncronous RSG, and I am looking for an
>1800 rpm motor around 2 to 3 hp. Does anyone know
>where I might be able to find such a creature? Also
>if I could find one, I could use a universal type
>motor that will be develop around the same hp with a
>lower rpm. I've already searched McMaster-Carr,
>Grainger, and other places but they don't seem to have
>what I am looking for. Any help would be appreciated
>as always.
>
>Thanks all,
>Rodney
>
>
>
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