Momentum? I do not understand what you are referring to. Can you explain for a new guy like me? It does not have to a complete deal just a brief that I might understand.
I have been thinking...this model railroading is in many ways the same as real railroding. For instance track problems and freight car problems. I have used the same system tio identify problems and solve them that I used in actual railroad world.
In the real world of engines that used DC traction motors we had "STALL BURNS" caused by putting high current to start a train to the traction motors and still the train would not start. This sitting still with current to the traction motors resulted in stall burns to the armature and burned or melted the insulation of the wiring in the motor itself.
Even it the train started moving engineers had to take into accou8nt the so called "SHORT TIME RATING" of the different types of locomotives. This was just how long under high current conditions a units traction motors would withstand the high temperatures produced without melting the windings in the DC motor. These time were accumulative meaning that if the cooling off time had not been observerd for a unit the engineer would add that time to the next high current use of the engine so as not to exceed the total time alloewed in a short period of time.
It was excessive time in high current situations that resulted in the vast majority of traction motor failures. The other was excessive speed based on gear ratios that made the traction motors literaly sling the windings off the DC Motors causeing short armature windings. Even thoug I do not think that is a problem with the model engine. "HEAT KILLS" traction motors in the real world and I see the same situation in the little DC motors powering the model train. If you had enough weight in the unit or the train was too heavy or someone held the little engines down to a stall while current was flowing to the motor it would burn the insulation and the armaturte just like the real world engine. Just as a note: in heavy mountain grade situations many an engineer including myself would reverse the locomotives and apply power to hold the train and then release the air to charge the system especialy in cold weather. This of course was a violation of the air brake and train handling rules but was the only realistic way to hold the trains while you charged up. This frequently led to failure of the motors on these engines prematurely.
I have been involved in many hundreds of investigations into derailments mostly track and equippment damage and several involveing death to the engineers or trainman. The same investigative proceedures I used then I have applied to my model train and each time have found the problem.
Anyhow, thi8s reference to momentum in DC motors has me stumped as to what you are talking about.
Redtail67
I have been thinking...this model railroading is in many ways the same as real railroding. For instance track problems and freight car problems. I have used the same system tio identify problems and solve them that I used in actual railroad world.
In the real world of engines that used DC traction motors we had "STALL BURNS" caused by putting high current to start a train to the traction motors and still the train would not start. This sitting still with current to the traction motors resulted in stall burns to the armature and burned or melted the insulation of the wiring in the motor itself.
Even it the train started moving engineers had to take into accou8nt the so called "SHORT TIME RATING" of the different types of locomotives. This was just how long under high current conditions a units traction motors would withstand the high temperatures produced without melting the windings in the DC motor. These time were accumulative meaning that if the cooling off time had not been observerd for a unit the engineer would add that time to the next high current use of the engine so as not to exceed the total time alloewed in a short period of time.
It was excessive time in high current situations that resulted in the vast majority of traction motor failures. The other was excessive speed based on gear ratios that made the traction motors literaly sling the windings off the DC Motors causeing short armature windings. Even thoug I do not think that is a problem with the model engine. "HEAT KILLS" traction motors in the real world and I see the same situation in the little DC motors powering the model train. If you had enough weight in the unit or the train was too heavy or someone held the little engines down to a stall while current was flowing to the motor it would burn the insulation and the armaturte just like the real world engine. Just as a note: in heavy mountain grade situations many an engineer including myself would reverse the locomotives and apply power to hold the train and then release the air to charge the system especialy in cold weather. This of course was a violation of the air brake and train handling rules but was the only realistic way to hold the trains while you charged up. This frequently led to failure of the motors on these engines prematurely.
I have been involved in many hundreds of investigations into derailments mostly track and equippment damage and several involveing death to the engineers or trainman. The same investigative proceedures I used then I have applied to my model train and each time have found the problem.
Anyhow, thi8s reference to momentum in DC motors has me stumped as to what you are talking about.
Redtail67