Re: New to list (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Thu, 14 Dec 2006 15:39:53 +0800
From: westland <westland@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: New to list (fwd)

This is good to hear Ed.  I've got two variac's ... a .25 kva and 2.5 
kva ... the .25 kva unit is a variable inductor from 0 to 1.89 Henries 
... the 2.5kva is variable from 0 to .38 Henries; so I imagine that 
first, smaller is better, meaning capacitance is less critical; and 
second, smaller is better  :-0 

I'm not an electrical engineer, but I presume what John has done in this 
circuit is push the current to lead the voltage with the cap, and then 
lagged it back variable with the inductor (the motor phase following the 
current peak).  So that a bigger coil could take a bigger capacitor. 

Tesla list wrote:
> 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
>
>
>
>
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>