Re: New to list (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 13 Dec 2006 14:48:35 EST
From: Esondrmn@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: New to list (fwd)

 
Chris,
 
I have built a synchronous rotary gap with an Oriental Motor, part #
5SK25A-AULA.  I also built a John Freau phase control circuit for this
rotary.  My motor came with a 3 uf cap.  Install this as cap as described
in the instructions (between gray and pale blue wires for clockwise
rotation and between black and pale blue wires for counterclockwise
rotation).  This cap stays in this configuration and is not involved in
the phase control circuit.  The phase control cap now goes directly across
the two line voltage input wires to the motor.  The variac, used as a
variable inductor, goes in series with one of the two motor leads to the
line.  I used a 10A 120 V variac and found the exact capacitance value was
somewhat critical.  By using a various combination of caps, I ended up
with what measured as 17.86 ufd for best operation.  This provided a
maximum voltage rise of 7.0 volts and a minimum drop (or decrease)  of
only 2.0 volts.
 
Good luck,
 
Ed Sonderman
 
In a message dated 12/12/2006 5:43:44 PM Pacific Standard Time,  
tesla@xxxxxxxxxx writes:

Date:  Wed, 13 Dec 2006 08:46:17 +0800
From: westland  <westland@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject:  Re: New to list (fwd)

I'm putting together John Freau's SRSG Electronic  Phase Controller, and 
had a question about the capacitor.  I  purchased an Oriental 'reaction' 
motor from Alan Majernick, which uses a  motor-run capacitor ... I 
believe these are basically there to phase shift  to motor to its 
torquiest operating state.   For John Freau's  circuit, do I just bridge 
this capacitor with a 50Kohm resistor, or do I  need a second capacitor?

Chris Westland