From: dhky@shaw.ca   
      
   On 06/10/2013 11:08 PM, Salmon Egg wrote:   
   > In one of my responses, id did say that the transformer rotated.While   
   > that is incorrect, it is not far off base. An induction motor is a   
   > transformer with a rotating winding. That is how you get slip.   
   > sometimes, I just do not think of a transformer and a induction motor as   
   > being fundamentally different.   
   >   
   > There also is an induction regulator which is an induction motor which   
   > is blocked from turning freelhy and serves as a variable transformer.   
   >   
      
   If you use a polyphase wound rotor machine with the rotor and stator   
   windings independent- then, depending on the position of the rotor, you   
   have a phase shifter. In this case the output voltage magnitude doesn't   
   change.  If you take the same machine and connect the windings as an   
   autotransformer you have your regulator. I have used the former but a   
   ganged 'variac' is  more efficent as the magnetizing current is much   
   lower. It is said that the "variac' has discrete steps in regulation vs   
   a smooth variation for the regulator --but-- the mechanical adjustment   
   for either may result in discrete steps.   
      
   There have been many, sometimes weird, devices based on the induction   
   motor- and, before modern electronics, many of them were intended for   
   speed control.   
   --   
   Don Kelly   
   remove the cross to reply   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)