Re: Motors and MOTS misbehaving.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: nancylavoie@xxxxxxxxxxx

You didn't specify if your MOTs were in oil.If 
not,that could be your problem.Remember the 
secondary insulation was never meant to see the 
voltages you are subjecting it to. Wyatt

-------------- Original message --------------
From: "Tesla list" <tesla@xxxxxxxxxx>

> Original poster: "Scott Bogard"
>
> Hi All,
> I have been building and playing with my
> 6-in 6-MOT tesla coil lately, and 2 strange and
> slightly disconcerting things are
> happening. Firstly I keep burining out MOTs (I
> have a bunch, but I would like to run it two
> nights in a row without replacing part of the
> power supply). I am using a filter composed of a
> bunch of ceramic capacitors to ground (a total of
> 600 pf, 300 from -6kV to +6kV, and 150 from +6kV
> to ground, and 150 from -6kV to ground), and two
> wire wound resistors, filled with welding rods
> (so they are kind of inductors, I don't have a
> clue what the inductance is, but the res istanc e
> is 50 ohms a piece) and of course safty gaps
> (which do fire, when it is out of tune (like when
> I am using small top loads, or my blower is too
> slow)). Tonight, one of the mots toward the
> center burned out (how is this possible?). I
> noticed some power arcing in the spark gap right before it went.
> Secondly, I have a motor, running a blower for my spark gap.
> Origionally, it was in tended for an ASRG, but it
> slowed down considerably when I turned on the
> power. So I moved it onto a differant breaker
> thinking it was a power draw issue, it didn't
> help. So, I checked for high voltage leaking in,
> I found some, fixed it, and the motor still
> slowed down. So, I gave up on it for an ASRG, as
> obviously it was just not strong enought for the
> job, and now I'm using it as a blower, it still
> slows down. I replaced the dimmer switch
> contro lling it with a variac, it still slows
> down. It works fine at full speed, but once you
> reduce the speed to about half it starts doing
> wierd stuff. I did an experiment earlier, and
> noticed somthing bizzarre, when I use a small
> topload (or no top load at all), the bahavior is
> much more extreme (It almost stops!). The motor
> is an AC/DC 15000RPM 1/8HP vacuum cleaner motor,
> and although the case is plastic, it is mostly
> sheilded by sheet metal and the blower housing (I
> don't believe they are grounded however). Does
> anyone have any experience on this? Thanks for your input.
> Scott Bogard.
>
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