Subject:
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Re: Smooth power or PWM for Lego train motors?
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Newsgroups:
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lugnet.trains
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Date:
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Tue, 2 Sep 2003 10:39:20 GMT
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Reply-To:
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javanree@%NoSpam%vanree.net
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Viewed:
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1045 times
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Amaury Jacquot wrote:
> well, duh, that was the 50 or 60 Hz you were hearing. proper pwm is done
> at a much higher frequency (10 or 20 KHz).
> by the way, this was probably a VERY CHEAP transformer
Some model railroad companies actually use that sort of DC to power their
trains to make them run more smoothly at low speeds... Fleischmann's "MSF"
principle is based around converting 50Hz AC to DC with only diodes, and
put the non-smoothed DC (thus with a 100Hz ripple) on the track (hook one
up to a scope and see, nowhere near a smooth DC)
As for PWM, some engines simply aren't compatible with PWM. Manufacturers of
PWM devices for model railroading usually include a big disclaimer, even
naming some types of motors that aren't fit. No clue however if this would
include the LEGO motor, and it depends on used frequency and duty cylcle of
the pulse etc etc.
--
Jan-Albert van Ree | http://www.vanree.net/brickpiles/
Brick Piles | Santa Fe B-unit
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Message is in Reply To:
 | | Re: Smooth power or PWM for Lego train motors?
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| Mark Bellis wrote: > I've seen the DCC mod some people have made to motors, and read about > the overheating problem. the overheating is not due to the use of PWM, but because the task asked from those motors was too great. why do you think long (...) (21 years ago, 2-Sep-03, to lugnet.trains)
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