RE: [TCML] Phase Controller

["Phil Tuck (hvtesla)" <phil@xxxxxxxxxxx>]

Andrew.
The only thing you can say for sure is that the bigger the HP rating of the
motor, the larger the capacitance required is "likely" to be.
Gary said he used a 40uF on a small teletype motor which, in the UK at
least, were under 0.5HP. I used 34uF on a 0.5 HP and 93uF on a 1.5HP.
However I am running on 50Hz - which will affect things most likly.
As John says on his site, look for the resonant rise that you are getting.
Too much means too big a cap, not enough is a bit too small, while no
resonant rise means definitely too small.

Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of mddeming@xxxxxxx
Sent: 17 January 2010 19:11
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Phase Controller


Hi Gary, All, 

True, it is all trial and error at this point. If there were enough examples
of data on the Make, HP, Voltage, RPM, and Cap Size, and Variac size of all
the existing, SUCCESSFULLY phase-controlled  SRSGs on the list, perhaps some
sort of useful "cluster patterns" might emerge. I would be willing to do the
compiling & analyzing if there is a convenient place on the list to host any
results that may come from it. I realize it may be some time before enough
data is collected to analyze. Please send any data off-list.

Matt D.





-----Original Message-----
From: Lau, Gary <Gary.Lau@xxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sun, Jan 17, 2010 11:33 am
Subject: RE: [TCML] Phase Controller


Trial and error is what we all use.  Way easier than pioneering a
mathematical 
odel and solution.  Don't we all have a junk box full of motor caps? ;-)
Since the caps are used (energized) continuously, they need to be motor RUN 
aps, as opposed to motor START caps, which are only suitable for momentary 
peration.  
I suggest asking others using the same size and type of motor as you are,
what 
hey use.  FWIW, with my small 3600RPM Teletype motor, I use a 40uF cap.
Regards, Gary Lau
A, USA
> -----Original Message-----
 From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
 Behalf Of Andrew Robinson
 Sent: Sunday, January 17, 2010 1:57 AM
 To: Tesla Coil Mailing List
 Subject: [TCML] Phase Controller
 
 Ok so using John Freau's design, whats the best way to get in the ball
 park on cap size? Can someone throw some supporting math out there
 instead of guessing? I would assume the type of cap used is important as
 well. Thanks all.
 
 ~Andrew
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