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D.C.-D.C. Step-Up Converters Discussed
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 Posted: Fri Feb 27th, 2015 04:42 am
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Tramcar Trev
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Herb you never cease to amaze me....



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 Posted: Fri Feb 27th, 2015 11:50 am
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mwiz64
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Changing to a hotter wind motor is a great idea. Just keep this in mind. Volts x Amps = Watts. Watts are what does the work. So if your current 12v train draws 1 amp to do its work then it's using 12 watts to do the work 12x1=12... Right? Now switch out to a 6v motor... You still need 12 watts to move the train but it's going to take twice the current. 6x2=12. What does that mean? Well if all else is equal the 6v motor is running your battery dead twice as fast. Right, we halved the voltage so had to double the current to do the same amount of work.

I still think this is a great solution. I just wanted everyone to understand what's going on.

A guy like Bernd probably increases the gear ratio thereby lightening the load on the system and R educing the current draw. This will cause the train to run slower but thats likely OK. Most engines run too fast anyway. And now we've come full circle. Are you guys sure the loco won't perform well enough with a lower voltage and no motor change? You might just try that first and see. You could be surprised....



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 Posted: Fri Feb 27th, 2015 02:29 pm
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Herb Kephart
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Si

Don't judge that wheel until it's finished. It is being chiseled to NMRA* standards of the day 

* National Mesozoic Railroad Assn.



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 Posted: Fri Feb 27th, 2015 02:35 pm
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Helmut
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@mwiz
Your reasoning only holds true if you assume that there is no poor gearing, nor sloppy bearings, and a motor that is equally effective as a can motor. Only then you need e.g. 12Watts in any case. Therefore I said: " tackle the mechanics", because there lie endless possibilities of improvement. As an example, that R/C switcher I've shown:
http://freerails.com/view_post.php?post_id=57971
originally used 150mA@12V at full slip.
After improving the axle bearings, and changing the drive train it uses 54mA@3V. Pulling power has even slightly increased due to the absence of motor-induced vibration.


Last edited on Fri Feb 27th, 2015 02:36 pm by Helmut



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