Re: Synch Motor Phase Controller question

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

Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slwhite-at-zeus.ia-dot-net>

The theory is this.

What you have with this circuit is a bandpass filter. At its center
frequency of about 60 Hz, the filter is resonant. As with any tuned circuit,
this causes the slight voltage rise. As you adjust the variac you are
slightly changing the center frequency of the filter, but more importantly
you are changing the phase shift of the filter. This adjustable electrical
phase shift is what gives you the adjustable mechanical phase shift on the
motor.

Steve: Coiling in Iowa

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, December 13, 2002 7:06 AM
Subject: Synch Motor Phase Controller question


 > Original poster: "Mccauley, Daniel H by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 >
 >
 >
 > Regarding John Freau's SRSG Phase Controller . . .
 >
 > 1.  How do you properly set this controller up???
 >
 >
 > I think the procedure says to select a cap size so that you measure a
 > maximum 5V voltage increase at about
 > the midpoint of the variacs travel.  Is this correct.
 >
 > Also what is theory on this.  I assume where resonant rise is the greatest
 > is where the phase passes through 0 degrees
 > so that with this setting you get a maximum +/- phase adjust from 0
degrees
 > by varying the variac (inductance)
 >
 > Any help or experiences with this appreciated!
 >
 > Thanks
 >
 > Dan
 >
 >
 >