Re: (ET) E12 lost power

[Chris Zach <czach computer org>]

Really? Hm. That is interesting. Though it's true my knowledge of the 
E12 series is kinda limited. Still, I thought the idea of the series 
field was to help increase motor power under heavy load and keep the 
armature from Etemping; why would they leave it out?

Chris


RJ Kanary wrote:

> You know this because the Elec-trak motors are not really 100% shunt
> motors. They have a small series field in series with the armature. It
> is this field that causes an E20 to have slightly less power in reverse,
> go a bit faster in reverse, and the big reason why you *NEVER* do field
> weakening in Reverse (the field is already slightly weaker due to the
> series field opposing the main field because reverse on an E20 reverses
> the armature and not the field like an E15)
>
> ALMOST...................................
>
> E 12 Models  'CA'  through  'HA'  do not possess this arrangement. Check 
> the
> schematic.
>
> ----- Original Message ----- 
> From: "Chris Zach" <czach computer org>
> To: "Richard Zachary" <Zach njcfsa org>
> Cc: "Elec-trak list" <elec-trak cosmos phy tufts edu>
> Sent: Sunday, June 27, 2004 1:26 PM
> Subject: Re: (ET) E12 lost power