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Re: (ET) field rev.

     A peek at the original schematic may provide the clues. At least during the GE production, the motors used in the E-15 and larger tractors have a very heavy field winding , that possesses few turns, in series with the armature. I'm not very up on my DC motor theory, but have dim recollections of this type of winding being used for either speed stabilization, or to cancel the effects of armature reaction.The placement of it will favor efficient armature rotation in one direction,and less efficiency in the opposite rotation.
     One of the real EE types on this list will certainly clarify this. :)
----- Original Message -----
Sent: Thursday, July 13, 2006 5:55 PM
Subject: (ET) field rev.

I have a New Idea 15 that I converted.  Got fed up with the controls so made my own.  I have a simple controller for the armature and 4 switches hooked up to the original resistors for the field.  My question is when I have it in high and least resistance to the field and put it in reverse it just speeds up by about 50%, why?  Nice feature though.

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