Subject:
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Re: More Questions from Another Train Newbie
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 19 Nov 1999 22:11:37 GMT
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Viewed:
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725 times
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In lugnet.trains, Bryan Wong writes:
> Hi,
>
> Someone recently mentioned the fact that 9V tracks can only handle a limited
> number of motors/engines (whatever you call them). Also, puting multiple
> motors on the track will result in each motor getting less "juice"
> (current?).
This is so,but this won't mean that you can't place 3 or 4 motors on the track.
The transformer gives 10V output at a 'power' of 7VA.
Some explanation :
VA is the multiplication of Volts & Ampere.
This means in our case that the transformer has an output current of 0.7Amp
Now,an UNLOADED motor consumes less current than a LOADED one.With load,i mean
the number of cars to pull.The more cars,the more current the motor needs.
This explains the fact that the number of motors on the track are limited.
Note that the train motors are INTERNALLY protected against overload.If they
are to much loaded,the motor current will increase so much that the protection
becomes active.This protection is a PTC (Positive Temperture Coefficient
Resistor - Resistance increases due to heathing up).
Is it true that using multiple motors in one train will result in
> an increase of "power" (be able to pull more)
You will have an increase of power because the total power is the sum from the
power of motor 1 and motor 2.
> , but also a decrease in speed?
As long as you don't put to many motors on the same track, no problem.
>
> Second, is there any point in connecting two speed regulators (with two
> transformers) to the same set of tracks?
Yes there's a point witch say's that you *** MAY NOT DO THIS ***.
In worst case you blow up your regulator !
1)This has to do with the fact that the regulators output voltage are slightly
different due to tollerance of the components.
2)You may NEVER connect the outputs from voltage regulators to each other
without a serie resistor and appropriate electronic cirquitry.
If you need a higher output current,you can use an other voltage regulator
capable for higher output currents (you need then also a heavier transformer
too [more Amp.,at the same voltage]) .
>
> Also, what is a "buffer"? I assume it's the black piece where you attach the
> magnet and the coupling to. Most commonly, it's attached directly to the set
> of wheels at a 90 degree angle... Hope I'm correct.
You are, its the black piece where you attach the magnet and the coupling to.
>
> Um, that's all for now. Thanks in advance.
>
> Bryan
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Message has 1 Reply:
 | | Re: More Questions from Another Train Newbie
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| (...) *** Warning *** Not a Lego purist application *** MRC Tech II throttles, well known in the model railroading world, solve this problem nicely. I have a passenger train with two locos (4 motors) which is no problem at all for my MRC throttle. (...) (25 years ago, 20-Nov-99, to lugnet.trains)
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Message is in Reply To:
| | More Questions from Another Train Newbie
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| Hi, Someone recently mentioned the fact that 9V tracks can only handle a limited number of motors/engines (whatever you call them). Also, puting multiple motors on the track will result in each motor getting less "juice" (current?). Is it true that (...) (25 years ago, 19-Nov-99, to lugnet.trains)
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