Re: synchronous motor

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "S.Gaeta by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sgtporky-at-prodigy-dot-net>


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, August 06, 2001 5:25 PM
Subject: Re: synchronous motor


> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi Justin,
>
> YES!!  The florescent lights are not an instant on-off things like a real
> strobe light is.  They "gradually" turn on and off which REALLY blurres
the
> image.  Maybe this is the problem people have been having recently...  Us
> folks who have done this before knew but maybe this "small" detail got
left
> out for the new folks...  I'll try to post more on this for the future...
>
> Cheers,
>

Good idea Terry! this threw me off in the beginning also. The other thing is
that I had to move my light to different positions before I found a position
where I could see the pattern at all (yes, all my other lights were off).
That was likely due to glare. I was also using a flourescent desk lamp and I
found that I was getting 2 very wide bright patterns on my 3600 rpm motor. I
was using a thin strip of white electrical tape on a matt black rotor, so
the wide black areas were actually showing up as the narrow shaded bands!
Prior to that I tried an NE-2 with no success at all. With a ceiling light
fixture at someone elses lab, the patten was much thinner and only one band.
Perhaps the thinner pattern was due to the fact that the light source was
further away from the motor. It also seems that desk lights pulse at
multiples of the line frequency. I was told to beware of desk lamps because
some have electronic ballasts.

Sue