Re: ASRG & DC power oddity

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

Original poster: "Christopher Boden by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>

I'll take a stab at this :)

If you play with a ASRG that is being spun by a DC motor this becomes 
evident very quickly.

What's happening is you're cycleing through the various points of the AC 
waveform slowly. If you use a DC motor where you can accurately vary the 
speed (I use motors from old IBM tape drives, rated 34VDC nominal and will 
spin all day long at 2VDC to 50VDC). Because the instantanious voltage at 
any given moment in time can be anywhere from 0 to 120V as your gap fires in 
close alignment to the waveform you're getting different voltages.

With a perfectly synced motor you can just as easly have electrode 
presentations happen at 0VDC as at the maximum. It's just a matter of 
turning the motor housing :)

This means that it IS possible to have a SRSG aligned to a point where 
everything is set up perfectly, and full power is applied to the coil, and 
NOTHING happens because when the gap comes into alignment the electrodes are 
at 0V....at least in theory. I've done this with just a transformer, but not 
in a tank circuit (as it's deadly to the transformer).

Because you're ASRG is *close* to the sync speed, but not dead-on, your 
electrodes are coming into alignment at a slightly different point in each 
succsessive wave of the AC input cycle. Thus, you've created the Beat 
Frequency effect :)

Get it? It's really hard to explain, it's one of those...you gotta get the 
feel of it things. :)

Now I'm going to go take advantage of the milder weather....but not by 
coiling.....I'm going STREET LUGEING! :) ha ha ha ha ha ha............


duck




Christopher A. Boden Geek#1
President / C.E.O. / Alpha Geek
The Geek Group
www.thegeekgroup-dot-org
Because the Geek shall inherit the Earth!



>Original poster: "J. B. Weazle McCreath by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <weazle-at-hurontel.on.ca>
>
>
>Hello Coilers,
>
>The milder weather we're having has let me carry on with some of my
>experiments with an ASRG and the DC power supply I'm developing and
>I've noticed an oddity.
>
>I'm using a 3450 RPM, 1/12 HP motor to turn a 6 inch teflon disk in
>which there are two flying electrodes passing thru the disk, spaced
>180 degrees apart.  The two fixed electrodes are on either side of
>the disk, meaning I get an alignment twice each revolution, or 120
>breaks per second.
>
>I notice that the motor has what I would term a beat note to it when
>running, the beat occuring roughly at one second intervals, sounding
>much like a twin-engined propeller driven aircraft when the engines
>are out of sync.  The spark when firing seems to follow this beat as
>well, and you can actually see the intensity of the arc varying with
>the beat note from the motor.
>
>The power supply is a twin MOT with the classic half wave doubler to
>give me about 11 KV unloaded.  I'm feeding the output of the doubler
>to the ASRG through two charging chokes (MOT secondaries) of 8.5 mH.
>The doubler cap is 1 uF., and the tank cap is 0.011 uF., yielding the
>recommended ratio as others have found.  I'm using my testing primary
>which in combination with the tank cap is resonant at about 430 kHz.
>and there is no secondary in the test setup.
>
>Can anyone on the list shed any light on this "beat note" behavior?
>Is it possible that my motor is under-powered to turn even a modest
>sized disk like I'm using?  Any suggestions are most welcome.
>
>73, Weazle, VE3EAR/VE3WZL
>
>Listening: 147.030+ and 442.075+
>E-mail:    weazle-at-hurontel.on.ca
>            or ve3ear-at-rac.ca
>Web site:  http://www.hurontel.on.ca/~weazle
>
>
>


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