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Re: (erielack) Re: Transition

Joe, you are wrong.  Transition is pretty much as Paul described it.  

All DC traction motors are series wound motors.

Also  AFAIK Diesel Electric locos did not use field shunting.

bob gillis

Joe K. wrote:

> At 09:39 PM 3/31/2007, you wrote:
>
>> "Transition" - at a high level - is when a diesel-electric's 
>> electrical system is changed from a parallel to series (and 
>> backwards) system. I can't remember what the initial state is, but 
>> the traction motor can be wired in parallel (output from generator is 
>> fanned out to each traction motor) or in series (output of generator 
>> goes to one traction motor, which then outputs the next traction 
>> motor, and so on)
>>
>>      - Paul
>
>
> I do believe this is not entirely correct (but I could be wrong). 
> Transition refers to the change in electrical characteristics of the 
> individual traction motors by operating the individual motors either 
> as series motors where the armature is in series with the field, or as 
> parallel where the armature is in parallel with the field. A series 
> wound motor produces very high starting torque and is the way they're 
> operated when starting to move and then they're changed to parallel 
> operation when under way. I don't believe that the motors themselves 
> are connected in series with the generator, but as I've said, I could 
> be wrong on that. 




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