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HAMO vs AC Armatures
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Offline chris.busby  
#1 Posted : 02 December 2002 12:34:07(UTC)
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chris.busby


Joined: 08/05/2002(UTC)
Posts: 138
Location: ,
An interesting thing happened this weekend.

We had a Hamo loco running around the DC section of the layout when strange smells emanated from the motor. Closer inspection revealed that one pole of the armature had shorted and burnt out causing all sorts of shorts, arcing and burnt out capacitors.

A quick rebuild with a spare three pole armature and plate later and it was back on the track.

So far, so good. BUT, it went backwards!!! A few more armature swaps and yes, Hamo DC armatures are wound the other way to AC armatures. A quick re-wire of the brush plate and everything was fine again.

Does anyone know any history behind this or if we are going mad?



Chris Busby
UK Marklin Digital layout builder
Chris Busby
UK Marklin Digital layout builder and collector.
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Offline Lars Westerlind  
#2 Posted : 02 December 2002 13:17:21(UTC)
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Lars Westerlind


Joined: 19/10/2001(UTC)
Posts: 2,379
Location: Lindome, Sweden
Hello Chris,
I only note that your problem occurs only when running DC two rail. For an old AC fellow like me, there really is nothing like "the wrong way", merely "the other way". (Strange, always when I speak to englishmen, I get this thought, are you driving at the right side or not? <img src=icon_smile_clown.gif border=0 align=middle>) With digital you can tell sometimes, but still not very important. So, there is the possibility that Märklin has wound som AC motors each way, and beeing careful with winding direction only for DC engines too.

So, lets hope you get an answer, but I doubt it.

Regards,
Lars Westerlind.
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Offline perz  
#3 Posted : 09 December 2002 21:46:15(UTC)
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perz

Sweden   
Joined: 12/01/2002(UTC)
Posts: 2,578
Location: Sweden
I have another question about HAMO vs AC Armatures: Except for the noted difference in polarity, are there any other differences ? I think there could e.g. be a different number of turns and a different DC resistance. Anybody who knows ?
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Offline Bart  
#4 Posted : 10 December 2002 00:05:28(UTC)
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Bart

Netherlands   
Joined: 13/05/2002(UTC)
Posts: 670
Per,
I don't know the answer to your question, but I just noted that the Hamo locs have the same motor cover but a different rotor than their AC counterparts.
E.g., 231440 is a typical Hamo rotor, replacing 245480 of the AC version. Interestingly, the 231440 rotor is also present in many 36xx models (sounds reasonable), but also in a variety of older 30xx locs.

*Bart
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