Subject:
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Re: What kind of motor comes with the 4559?
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 14 Jan 2000 14:12:51 GMT
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Viewed:
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942 times
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Larry Pieniazek wrote:
> However, note that there is a faction that feels more than one motor is more
> likely to interfere with speed control. The GMLTC layout has only one power
> connection to its main line loops and when a train is at the far end there is a
> noticable slow down due to path length adding extra resistance... This slow
> down seems to be made worse by having two motors in the train instead of one.
That does follow from electrical theory. Two motors draw more current,
which is going to result in a larger voltage drop over the rails (since
V=IR). Of course since we don't have an ideal power supply, the actual
calculation is not quite so simple (among other things, you also need to
know the internal resistance of the power supply, if I'm remembering
right, a real power supply can be fairly acurately modeled by using a
constant voltage supply in series with a resistor, or a constant current
supply in parallel with a resistor).
--
Frank Filz
-----------------------------
Work: mailto:ffilz@us.ibm.com (business only please)
Home: mailto:ffilz@mindspring.com
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Message is in Reply To:
 | | Re: What kind of motor comes with the 4559?
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| (...) Do you perhaps mean a different set? 4559 (ref: (URL) ) has a little tiny engine built on top of the motor unit. It's difficult to see how to give it two motors. Even the alternate steamer has only one. (oh how I long for the days when Lego (...) (25 years ago, 14-Jan-00, to lugnet.trains)
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