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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.
> 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:
> 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.
> Can someone give me a good initial value for the cap size in the above
> szenario? I only own a 10µF and two 7µF 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