Re: (ET) Reversing E20 DA Motor Polarity

["Bob Murcek" <rmurcek geisinger edu>]

I'm not the best source of info on this, but I'm a little confused about 
what you mean and maybe others are also.

Before the conversion, did it run smoothly in forward and jumpy in reverse?
If so, and it's now the other way around, you could reverse BOTH the 
armature and field connections to see if the jumpiness is polarity 
related.  (If you were to reverse only the armature or the field, the 
motor would run in the opposite direction.)  Normally polarity wouldn't 
matter to a DC motor, but if the E20 motor is as complex (opposing series 
field for speed regulation) as mine, maybe polarity does matter.

It might be a good idea to have someone with an E20 schematic tell you 
what the polarity of the connections to the armature winding were in the 
original setup, duplicate that, then reverse the field connections if 
necessary to get things going the right way.

If the thing was jumpy in the forward direction before the conversion, or 
if you don't know whether it was jumpy before the conversion, it's 
possible that there's a problem with the brushes that causes problems in 
one direction; the motor guys could tell you what to look for...Bob
 

>>> "Raymon R. Ellis" <rayellis direcway com> 8/27/2004 5:51:13 PM >>>
Will a member, maybe Ralph, who has experience with the electronic
controller conversion of the E20, tell me the best way to change rotation
direction on the E20 motor? The original setup of the drive motor runs best
in one direction and is kind of jumpy in the other direction. Is it OK to
run the motor with armature cables reversed so that the smooth running is 
in
forward gears? The motor now wired in accordance with supplier provided
schematic is jumpy in forward and smooth as silk in reverse. The motor was
tested before the conversion using two 12v batteries and direction of
rotation was reversed by changing either the polarity of the field (F1 & 
F2)
or the armature (A1 & S2). A comment will be appreciated. Thank you. Raymon
Ellis




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