Fw: [VirginianRailwayEnthusiasts] TAN Jackshaft Electric Locmotives

[NW Mailing List]

I neglected to mention that the change in locomotive speed from 14 mph to 28 mph was accomplished by switching the motor stator connections so that the number of poles was reduced from 8 to 4, doubling the motor rotational speed.  These stators were delta connected.

Gordon Hamilton

----- Original Message ----- 
From: Gordon Hamilton 
To: N&W Mailing 2List ; VirginianRailwayEnthusiasts at yahoogroups.com 
Sent: Thursday, June 12, 2008 5:31 PM
Subject: Re: [VirginianRailwayEnthusiasts] TAN Jackshaft Electric Locmotives



Not being an electrical engineer, I'm on shaky ground, but, yes a current was induced in the rotor and conveyed via slip rings to water rheostats. The water rheostats consisted of electrodes in a tank that contained a soda ash solution (10 lbs. to 300 gal. water).  The solution level was raised by pumps to reduce the resistance in the rotor (secondary) circuit.  In accelerating to the synchronous speed of 14 mph or from 14 to 28 mph, the solution was raised until the solution contacted an ordinary automotive spark plug which actuated a contactor to short-circuit the rotor circuit.  I suppose at that point one would say that it was operating as a pure induction motor.  Also, at this point the solution level would be lowered to be ready for the next acceleration event.

Gordon Hamilton

 ----- Original Message ----- 
  From: Peter Groom 
  To: VirginianRailwayEnthusiasts at yahoogroups.com 
  Sent: Thursday, June 12, 2008 4:12 PM
  Subject: Re: [VirginianRailwayEnthusiasts] TAN Jackshaft Electric Locmotives


  I didn't realize that they had wound rotors - I assumed that they were like domestic induction (washer, fan) motors. 



  I assume that the current in the rotor windings was still induced.


  pete groom





  On Jun 11, 2008, at 7:24 PM, Gordon Hamilton wrote:



  The large three-phase, 25 cycle, wound rotor induction motors used on the N&W LC-1 and LC-2 and VGN EL-3A electric locomotives were rugged devices (no commutators).  .  .   .
  .
   






------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG. 
  Version: 8.0.100 / Virus Database: 270.3.0/1499 - Release Date: 6/12/2008 7:13 AM


__._,_.___ 
Messages in this topic (8) Reply (via web post) | Start a new topic 
Messages | Files | Photos | Links | Database | Polls | Members 
"Takin' 20 with the Virginian Brethren" meeting reports and comments on your questions from retirees usually posted after Wednesday nights. http://finance.groups.yahoo.com/group/VirginianRailwayEnthusiasts/ 
MARKETPLACE

--------------------------------------------------------------------------------
Blockbuster is giving away a FREE trial of - Blockbuster Total Access.  
 
Change settings via the Web (Yahoo! ID required) 
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional 
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe Recent Activity
  a..  2New Members
  b..  1New Photos
Visit Your Group 
All-Bran
10 Day Challenge

Join the club and

feel the benefits.

Food Lovers
Real Food Group

on Yahoo! Groups

find out more.

Health Groups
for people over 40

Join people who are

staying in shape.
. 
__,_._,___ 


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG. 
Version: 8.0.100 / Virus Database: 270.3.0/1499 - Release Date: 6/12/2008 7:13 AM
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://six.pairlist.net/pipermail/nw-mailing-list/attachments/20080612/c2a59119/attachment.htm>