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Re: sync motor RPM ???
---------- Forwarded message ----------
Date: Tue, 21 Oct 1997 13:05:34 -0400
From: "George W. Ensley" <erc-at-coastalnet-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: sync motor RPM ???
Gary,
I had the same problem at first. Then i realized that the neon light stayed
lit a significant portion of the 1/2 cycle. The answer for me was to use a
light dimmer to limit the neon on time to a few degrees of the rotation. It
was still a little blurry but clear i was in sync.
At 09:52 PM 10/20/97 -0600, you wrote:
>
>
>---------- Forwarded message ----------
>Date: Mon, 20 Oct 1997 18:17:55 -0700 (PDT)
>From: gweaver <gweaver-at-earthlink-dot-net>
>To: Tesla-at-pupman-dot-com
>Subject: sync motor RPM ???
>
>I made a sync motor today using a 1/4 HP electric motor. I cut 4 flats on
>the motor rotor. The flats are all equal. The flats are at 90, 180, 270
>and 360 deg. The space between the flats are equal to the flats in width. I
>did this in the milling machine so its within a few thousands. The motor is
>1725 RPM and has 4 start windings and 4 run windings. I turned it on and
>let it run for 5 hours and it did not over heat. I checked it to see if it
>was running 1800 RPM's but I don't think it is. Fluorscient lights should
>blink at 60 HZ and make the shaft appear to be stopped but it doesn't. I
>connected a neon light in parallel with the motor and use the light in the
>dark to see if the shaft appeared to be stopped but it isn't. I put a diode
>on the neon so it would blink at 60 Hz and tried again and the shaft still
>does not appear to be stopped. The shaft keyway can not be seen even if I
>move the neon light all the way around the shaft 360 degrees in the dark.
>Any ideas?
>
>Gary Weaver
>
>
>
George...
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