A Christmas Mystery

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A Christmas Mystery - Does analog loco decrease speed into curves, but not when digitally controlled?

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aclassifier		#1 Posted : 02 January 2025 13:49:59(UTC) Retweet
Joined: 18/03/2012(UTC) Posts: 156 Location: Trondheim		Happy New Year! A relative proudly brought a Märklin 29552 Harry Potter Hogwarts ExpressPassenger Train Starter Set here for Christmas. He had bought the loco and the two cars, packed in bubble wrapper with no original box. Just picked up from a seller as they drove by, coming up here. He bought some R=360 mm track and some straight track in a shop here. A mystery (to me, at least) was that it looked like (and sounded like) this nice steam engine struggled more when going from straight into circular track when it was controlled from my AC transformer than when we ran it from a black MS2 with 3.55? May this observation be correct? I would be surprised if when digital speed is done, that the controller would measure the back EMF from the windings to keep the speed constant? If so, it could explain it. Especially if the same controller did the EMF measurements on digital but not when analog? Enlightment needed! Øyvind
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marklinist5999		#2 Posted : 02 January 2025 14:25:20(UTC) Retweet
Joined: 10/02/2021(UTC) Posts: 3,865 Location: Michigan, Troy		Which system did you run it on first? I don't think it should matter. A new or long storage Loco. needs to run in a bit before it is smooth and the speed is maximized. If it's an old style commutator motor, the brushes also need to seat, as they are flat on the contact points with the arnature when new. It can take up to 5 minutes in each direction for them to conform the the rounded shape and make proper contact. Otrherwise with a can motor, some have brushes, some don't. The oil on the geartrain is dry and needs to warm up also.

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aclassifier		#3 Posted : 02 January 2025 14:28:42(UTC) Retweet
Joined: 18/03/2012(UTC) Posts: 156 Location: Trondheim		Originally Posted by: marklinist5999 Which system did you run it on first? I don't think it should matter. A new or long storage Loco. needs to run in a bit before it is smooth and the speed is maximized. If it's an old style commutator motor, the brushes also need to seat, as they are flat on the contact points with the arnature when new. It can take up to 5 minutes in each direction for them to conform the the rounded shape and make proper contact. Otrherwise with a can motor, some have brushes, some don't. The oil on the geartrain is dry and needs to warm up also. Good points! I forgot to say. We did the digital first for many rounds (to be honest, it was on another track). Then analog. The we discovered. Then we oiled it with Märklin oil. No difference.
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FastEddie		#4 Posted : 02 January 2025 14:52:13(UTC) Retweet
Joined: 09/07/2023(UTC) Posts: 37 Location: Delaware, Long Neck		Originally Posted by: aclassifier Happy New Year! A relative proudly brought a Märklin 29552 Harry Potter Hogwarts ExpressPassenger Train Starter Set here for Christmas. He had bought the loco and the two cars, packed in bubble wrapper with no original box. Just picked up from a seller as they drove by, coming up here. He bought some R=360 mm track and some straight track in a shop here. A mystery (to me, at least) was that it looked like (and sounded like) this nice steam engine struggled more when going from straight into circular track when it was controlled from my AC transformer than when we ran it from a black MS2 with 3.55? May this observation be correct? I would be surprised if when digital speed is done, that the controller would measure the back EMF from the windings to keep the speed constant? If so, it could explain it. Especially if the same controller did the EMF measurements on digital but not when analog? Enlightment needed! Øyvind I don't know digital, but an analog AC circuit will be slower the further away the engine gets from the circuits connection with the transformer - that is why on long ovals you use two power connection points. Could it be distance away from the power strip and not the entrance into a curve that caused the slowdown?
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aclassifier		#5 Posted : 02 January 2025 14:56:58(UTC) Retweet
Joined: 18/03/2012(UTC) Posts: 156 Location: Trondheim		I wouldn't think that we observed anything like that. Anyway the track was so short that Santa Ohm was nice with us.
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