Subject:
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Electrical behavior of ganged motors
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 28 Apr 2005 01:08:05 GMT
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Viewed:
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1502 times
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Say you hook multiple motors up to a train controler, with a different load
on each motor. What's going to happen? I would assume they all get the same
voltage, but the current distribution is uneven, with the most heavily loaded
motor drawing the most current. Does that underpower the other motors?
I did this for a GBC, and it looks like a burned out a motor. The mechanism
still moves (I've not extracted the motor, but it seems not to have any excess
friction), but a multimeter test shows an open circuit across the motor. Ugh.
How did I do this? Is this something I should have expected running multiple
gear motors off one train controler, or did I just get unlucky?
While we're at it, now I'm starting to think about ganged gear motors driven
by an RCX. Here the current will stay plenty low, but I wonder about how the
mechanical power of the two motors varies with load (if one pulls more current,
the sets a lower current limit on the second, reducing its torque... if both are
driving the same shaft (mechanically linked), then this means more of the load
shifts to the first motor, so it draws more current, etc... Does one motor run
away with the system?).
--
Brian Davis
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