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In lugnet.technic, John Barnes writes:
> That figure was the normal operation (no load) figure. What concerned me was
> that it was a factor of almost 20 higher than the gear motors which normally
> run about 10mA. Of course, it is very easy to overlook the fact that the
> gear motor is extraordinarilly low friction, and thus draws very little
> power off load in overcoming its own mechanical losses. The buggy motor is
> of the cruder "toy" motor design which are notoriously inefficient anyhow
> and since I have never opened the casework, I don't know how "nice" the gear
> train is. So it is hard to know what the real buggy motor off load current
> would be if it were not possibly overcoming all sorts of gear train friction.
Well, check this out:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=24307
There are a few pictures of the internals of the motor. Quite a few gears!
> I will apply some juice to one stalled, and assuming I don't break
> something, let you know what the current consumption is asap.
Thanks!
TJ
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Message has 1 Reply:
 | | Re: 8475 Motor Tests
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| Ok, here is an extrapolated result for the short circuit (stalled) test. The current at 9 volts would be 3.6 amps. Since I did not wish to burn up the motor, I checked current readings at both 3 and 6 volts and also measured the DC resistance and (...) (24 years ago, 8-Jan-03, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | Re: 8475 Motor Tests
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| That figure was the normal operation (no load) figure. What concerned me was that it was a factor of almost 20 higher than the gear motors which normally run about 10mA. Of course, it is very easy to overlook the fact that the gear motor is (...) (24 years ago, 8-Jan-03, to lugnet.technic, lugnet.robotics)
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