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Re: Phase controller question.

Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

This may ir may not work depending on the type of motor you are using. A
simple diode in series will provide an equivelant of 87 V if your motor will
tollerate 1/2 wave power.
   Robert   H

 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 25 Jun 2004 20:32:17 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Phase controller question.
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 25 Jun 2004 20:40:27 -0600
 > Original poster: "Christoph Bohr" <cb-at-luebke-lands.de>
 > Hello all.
 > Two small questions about phase controllers:
 > 1st:
 > Will it effect the operation of the classic phase controller circuit, when
 > I use a stepdown (auto)transformer after the phase controller
 > to attach a motor that runs at lower voltage?
 > I know what you want to say: Put your transformer before your controller,
 > but in this specific case it would be much easier for me to put the
 > stepdown xformer after the controller.
 > To be honest. I already tried and it sorta worked, but the angle about
 > which I can vary the phase seems very, very small and I
 > am simply not sure if I migh be messing things up.However, I get a 8V
 > resonant rise in the middle of the variacs range.
 > Motor is a 220V 370W 3000rpm motor the runs at 90V 0.5A after modification
 > ( Do'h ), so I need the 90V supply voltage.
 > 2nd:
 > Can someone give me a good initial value for the cap size in the above
 > szenario? I only own a 10F and two 7F caps that should be suitable.
 > Controller operation voltage would be either 90 or 230V, my variac is a
 > 230/250V 10A unit, motor specs are given above.
 > Best regards
 > Christoph Bohr