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Posted by on August 19, 2006, 2:54 pm
Any good way to estimate torque for stepper motors you can't find
documents for (except for buying a 600 bucks torque meter. :)
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Posted by Peter Harrison on August 19, 2006, 4:09 pm
wv9557@yahoo.com wrote:
> Any good way to estimate torque for stepper motors you can't find
> documents for (except for buying a 600 bucks torque meter. :)
>
I once spoke to a guy who worked at a stepper motor manufacturer. He
claimed they routinely tested motors by wrapping string around the
output shaft. One end it connected to a known mass, the other connected
to a spring balance. The difference is the torque. Load it up until it
stalls.
Use two spring balances to make a simple Prony brake.
Try Google and/or here:
http://www.tpub.com/content/engine/14037/css/14037_53.htm
Pete Harrison
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Posted by Jim Granville on August 19, 2006, 5:05 pm
wv9557@yahoo.com wrote:
> Any good way to estimate torque for stepper motors you can't find
> documents for (except for buying a 600 bucks torque meter. :)
maybe a $2 spring balance, and a lever arm ?
-jg
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Posted by Peter Heidrich on August 20, 2006, 3:18 am
wv9557@yahoo.com schrieb:
> Any good way to estimate torque for stepper motors you can't find
> documents for (except for buying a 600 bucks torque meter. :)
>
Alternatives:
1. Estimate the torque generated via an FE analysis, but you would have
to know: cross-sections, material data, etc. Very, very theoretical
approach.
2. Measure, but time-consuming an expensive.
3. Probably the most practical approach: buy a stepper-motor that comes
along with the complete documentation.
Regards,
Peter.
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Posted by Hans-Bernhard Broeker on August 20, 2006, 8:11 am
In comp.arch.embedded wv9557@yahoo.com wrote:
> Any good way to estimate torque for stepper motors you can't find
> documents for (except for buying a 600 bucks torque meter. :)
1) Replace it by a stepper motor you *can* find documents for ;-)
2) Build your own torque-meter. Since you x-posted this from a
robotics newsgroup, I'll boldly assume you know enough about mechanics
to pull that off. A lever arm, a counterweight and maybe some gears
should do it. If you want to measure power instead of torque, you
might want to consider Joule's method of measuring mechanical work in
terms of generated heat --- or drive a dynamo.
3) find a cheaper torque meter. Torque wrenches for car wheel nuts
are generally a good deal cheaper than 600 bucks.
--
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.
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> documents for (except for buying a 600 bucks torque meter. :)
>