Subject:
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Number of motor units on one loop
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 24 Nov 1999 23:25:50 GMT
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Viewed:
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1241 times
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A short while back there was a thread about the number of motor units
that would run well on one loop. I've done some playing, and here is
what I found:
Using up to four motor units increases pulling power with only a small
decrease in speed. Five and six units give a small increase in pulling
power, but result in a large speed decrease. Seven or more units load
the controller enough that the motor units produce a lot of hum.
One two motor loco only pulls about 75 percent of the load that two
single motor locos can pull (better weight distribution).
A common question is: How many cars can I pull with my single motor
loco? Ans: Of course, it depends on the cars, but about ten cars is
the limit before drive wheel slipping starts. Increasing loco weight
increases pulling capacity as does reducing car weight.
When you guys attempt to set your "World's Record" track length record,
it might be fun to also try for the record for the most cars (and locos)
in one train!
The LEGO train controller only changes the DC voltage level to control
speed ... for long track loops (or very long trains) a pulse width
modulation system would probably be a big improvement (and also give
more realistic acceleration. A PIC, and H-bridge, and a pot would do
the trick.
- Nick -
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