[PRCo] Re: Interurban PCCs ???

[James B. Holland]

With  Digital__Command__Control  (DCC)  for models these days, BEMF is 
built into the decoders which allows for much smoother control in 
addition to constant speed of the equipment regardless of grade.       
Not really interested in the latter because the prototype PCCs didn't 
have that feature, but the smoothness of control is a big plus.


Jim



John Swindler wrote:


> Does that mean, Boris, that the balancing speed of a PCC motor would 
> be around 30 mph on level track with 600 volts. And it is the 
> weakening of the field that allows the motor speed to increase to 
> propel a PCC car to around 42 mph?? In other words, at what track 
> speed would the back EMF equal applied force without field shunting?? 
> And with field shunting???
>
> John
>
>
>> From: "Boris Cefer" <westinghouse at iol.cz>
>>
>>
>> You are much closer to various sources, Jim.       At these days 
>> Boston has field shunts disconnected to restrict speed on the 
>> Mattapan-Ashmont "high-speed" line. The PCCs I rode there were not 
>> able to exceed 30 mph.
>>
>> B
>>
>> From: "James B. Holland" <PRCoPCC at P-R-Co.com>
>>
>>> Wonder about other PCC cities using shunting for greater 
>>> speed.       Shaker, Boston, IT, PE, could definitely benefit from 
>>> this. Gotta collect more schematics, Boris!!
>>>
>>>
>>> Jim
>>


Jim__Holland


I__Like__Ike.......And__PCCs!!

down with pantographs ---- UP___WITH___TROLLEYPOLES!!!!!!!