Subject:
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Re: matching motor speeds on mutli-motor trains
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 27 Mar 2000 18:43:42 GMT
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Highlighted:
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(details)
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2146 times
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In lugnet.trains, Frank Filz writes:
> Mario Ferrari wrote:
> > Actually there's no problem at all. This topic has been deeply discussed in
> > the lugnet.robotics ng:
> >
> > http://www.lugnet.com/robotics/?n=9845 (some train specific examples in this
> > message)
> > http://www.lugnet.com/robotics/?n=9899
> > http://www.lugnet.com/robotics/?n=9707
I looked at the first one. I need to do some digging but I seem to remember a
problem in using multiple units together. It's hazy to me, but it revolves
around gearing. I seem to recally that locos that are geared differently could
not be MUed together because of the speed difference at the same throttle
setting.
>
> Thanks for pointing to some discussionsby knowledgeable people. I
> intuitively felt there wasn't a problem, but don't have the analog
> electrical knowledge to describe exactly how it isn't a problem.
>
> With a train motor (LEGO or real) there's another factor which will help
> balance extremely imbalanced motors, wheel slip (though I expect that
> would be a fairly small factor, it will absorb at least some of the
> difference since the real world isn't ideal).
Wheel slip is a *bad thing* if you have wheels with rubber tyres, which LEGO
uses. excess slip causes tyre heating and the rubber eventually perishes, or
deforms enough to come off.
I'm not sure I'd just dismiss this just yet. But I may just be paranoid.
++Lar
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Message has 2 Replies:
 | | Re: matching motor speeds on mutli-motor trains
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| (...) Ya, there are 2 "standard" gearing setups, one which maxes out at something like 97 MPH and one at 112 MPH. You cannot MU otherwise compatable equipment that has the different gearings. Also, note, you cannot MU things like SW1xxx's with say (...) (25 years ago, 27-Mar-00, to lugnet.trains)
| | | Re: matching motor speeds on mutli-motor trains
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| (...) That could be a problem, but I wouldn't expect that much wheel slippage (I'd make a SWAG that the power difference which is taken up by wheel slippage would be 5% or less of the total power difference). I'd also wonder how it would compare to (...) (25 years ago, 27-Mar-00, to lugnet.trains)
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Message is in Reply To:
| | Re: matching motor speeds on mutli-motor trains
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| (...) intuitively felt there wasn't a problem, but don't have the analog electrical knowledge to describe exactly how it isn't a problem. With a train motor (LEGO or real) there's another factor which will help balance extremely imbalanced motors, (...) (25 years ago, 27-Mar-00, to lugnet.trains)
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