Re: Teletype motor (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 14 May 2007 20:34:26 EDT
From: FIFTYGUY@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: [PHISH] RE: Teletype motor (fwd)

 
 
In a message dated 5/14/07 7:37:31 P.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:

>   How much phase change (shaft position WRT no  adjustment) did you get?  
Variacs without >gaps in the core are more  nearly variable saturable reactors 
than inductors I should  think. 

    Using an unmodified Staco Type 291 (3A, .4 kVA), my  little Oriental 
motor gets a full 45 mechanical degrees of adjustment. I  verified this with a 
good digital stroboscope with no "drift". It takes the  entire adjustment range 
of the variac to do so.
    It was very picky about the value of the additional  cap.
    I did discover, with the good stroboscope, that the  Oriental is in fact 
a hysteresis type. When it restarts, it is in a different  shaft position. 
However, using it as a standard 1800 rpm/120 bps/4 stationary  electrode Blake 
prop gap, it always starts at the same phase angle, no matter  which electrode 
it starts near.
 
-Phil LaBudde

 
Center for the Advanced Study of Ballistic  Improbabilities



************************************** See what's free at http://www.aol.com.