Subject:
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Re: High Failure Rate of New Type 9V Geared Motor
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Newsgroups:
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lugnet.robotics, lugnet.technic
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Date:
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Sat, 22 Oct 2005 01:24:04 GMT
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Viewed:
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1259 times
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In lugnet.robotics, Nathan Bell wrote:
> Do you think it is excessive torque, excessive use, or just a bad piece design
> that causes this problem?
I suspect it's bad design. Perhaps the way the brushes rub on the PCB as pointed
out by Philo (http://www.philohome.com/motors/motor.htm). "This higher friction
explains why 43362 stops faster when you give the shaft a twirl, and why its
no-load current is higher (9mA vs. 3.5mA)".
Its performance is degraded compared to the earlier motor (#71427). The only
advantage seems to be its lighter weight.
In previous posts misgivings have been expresed about this new motor which I am
now re-voicing:
http://news.lugnet.com/robotics/?n=19204
http://news.lugnet.com/technic/?n=8601
C S Soh
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