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In lugnet.technic, John Barnes writes:
> This is interesting information, thanks TJ. I must say that I got the visual
> impression that the buggy motors seemed to have more than a mere 2 - 3 times
> more shaft power output than the gear motors.
Yes, I did too. Judging from the performance of the RC car, you'd think the
motors would be equivalent to perhaps 8, or more, of the geared 9V motors.
The buggy can really zip along!
There was one other thing about my test. When the 9252 motor stalled, the
green LED on the train controller dimmed significantly. I wonder if it was
able to provide adequate current. Surely so! If not, then my torque results
could be low.
> The little piece of data which would add greatly to your 2 - 3
> times figure would be the current consumption. I have a nasty
> feeling that the Technic gear motor has set the gold standard
> for electric to mechanical power conversion efficiency.
I don't have a current meter (yet), but yes that would be good. Well, you
provided some current data a while back:
http://news.lugnet.com/technic/?n=7701
Was that 200mA at stall torque, or just during normal operation? Can you
test the motor at stall sometime soon? That can then be my current data
point for maximum torque. We have plenty of measurements for the geared 9v
motor for comparison.
> If the buggy motors make 3 times the torque converted to the
> same rpm, but at the expense of 10 times the power consumption
> (which I have a feeling is the case) then for battery operated
> applications like 99% of Technic/Mindstorms creations, they are
> not quite such a hot prospect.
Well, I hope my test is a little flawed, and the 9252 motors turn out better
performers. I plan on using mine!
TJ
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Message has 2 Replies:
 | | 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 (...) (21 years ago, 8-Jan-03, to lugnet.technic, lugnet.robotics)
| | | Re: 8475 Motor Tests
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| (...) The limitation on the train controller is the wall wart - not the controller itself. There was discussion on this in .trains a while back. Someone built a tranformer box with about 3A output IIRC, and ran several trains with it through an (...) (21 years ago, 9-Jan-03, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | Re: 8475 Motor Tests
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| This is interesting information, thanks TJ. I must say that I got the visual impression that the buggy motors seemed to have more than a mere 2 - 3 times more shaft power output than the gear motors. The little piece of data which would add greatly (...) (21 years ago, 8-Jan-03, to lugnet.technic, lugnet.robotics)
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