Subject:
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Re: Electrical Things (was: Railroad Dilemma)
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 8 Mar 1999 13:50:39 GMT
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Reply-To:
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LPIEN@IWANTNOSPAMnospam.CTP.COM
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Viewed:
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2900 times
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Simon Robinson wrote:
>
> CHARACTERISTICS OF ONE CONTROLLER
> ---------------------------------
> As I suspected the controller supplies a variable voltage. As you move the
> speed regulater from zero to the first of the 6 marks the voltage suddenly
> jumps up to about 3V. It then increases linearly up to about 9V for the
> maximum speed. I say roughly because my controllers, both newish, differ
> by 0.2V, so I guess Lego's quality control for this stuff isn't too exact (it
> doesn't really need to be).
I'm not sure I agree that the voltage is variable. People have reported
(via oscilloscope analysis) that it's pulse width modulated 9V instead.
This will read on an analog meter like a low voltage, because it's
taking the average across time.
>
> The motor power unit has a resistance of 8.7 ohms, so at max. speed, it's
> eating up about an amp. (or about 9 watts of power).
How did you measure that resistance? Ohmmeter across an unpowered motor?
I don't think an amp sounds right. You can battery power these motors
for a good long while on 6 AA batteries. I bet the resistance is a bit
higher with voltage applied.
Disclaimer, I'm not an EE, I never could get past Electromagnetic Fields
class. :-) So I could be all wet.
--
Larry Pieniazek http://my.voyager.net/lar
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Message has 1 Reply:
 | | Re: Electrical Things (was: Railroad Dilemma)
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| (...) If you have any URL's where people have reported on this, I'd be interested. (...) Yep - it was ohmmeter across unpowered moter. I did think about directly measuring the current with the motor running, but my multimeter has a maximum current (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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Message is in Reply To:
| | Electrical Things (was: Railroad Dilemma)
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| I finally got round to having a play with my controllers and my multimeter. PUTTING TWO CONTROLLERS ON THE SAME TRACK ---...--- Firstly, apologies to Ben, who suggested if you connect two controllers to the same track, then they'd short only if the (...) (26 years ago, 8-Mar-99, to lugnet.trains)
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