Subject:
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Re: Site updated
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 20 Aug 2001 12:34:30 GMT
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Viewed:
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1349 times
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Steven Lane wrote:
> I will now rig up the Rotinoff with two gear motors and report back with the
> results.
Excellent, we need some real science in this stuff for sure :-)
My hunch is still that when geared down to the same rpm the ungeared motors
deliver the greater torque, although admittedly I have never done a proper test
to establish this. As evidence in favour of this I cite three examples:
1) The ungeared motors consume more power - not that this means anything but it
is an indicator of sorts.
2) One ungeared motor was enough to move an 8448 at pretty good speed, and would
even work when starting in top gear on a smooth surface! One geared motor in my
skip truck has a bit of a struggle to make it move at a slow speed over carpet,
with the result that the improved model uses two.
3) Air compressor experiements - my most powerful one motor compressor used the
ungeared motor. I've never been able to equal it in terms of pressure and
airflow with a geared motor.
Of course, I am well prepared to be proven wrong in this. In particular it may
be the case that the motors perform radically differently under different
loads/shaft rpms. A wide ranging test incorporating those factors would be
ideal. I can feel the bench power supply, multimeter, weights and pulleys coming
out ;-)
Jennifer
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Message has 2 Replies:
 | | Re: Site updated
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| (...) I think so too! I think it is generally better to use the ungeared motor for applications where you need a quickly spinning thingey. For the small compressor, I usually gear the ungeared motor down using a rubber band and the large pulley, and (...) (23 years ago, 20-Aug-01, to lugnet.technic)
| | | Re: Site updated
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| (...) Well' I wouldn't consider my approach particulary scientific :-). I've fitted the 2 gear motors and it's a big improvement but not in the way you would expect. I repeated the pulling test and the transmisson gives in long before the motors do, (...) (23 years ago, 20-Aug-01, to lugnet.technic)
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Message is in Reply To:
| | Re: Site updated
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| (...) I've been thinking about this question again today and after 2 minute's research at: (URL) found out that the speed difference between the gear motor compared with a non-geared motor geared down by a factor of five is only 33%. Therefore you (...) (23 years ago, 18-Aug-01, to lugnet.technic)
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