stepper motor torque

Posted by J.A. Legris on August 20, 2006, 11:06 am

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. :)

http://www.romanblack.com/stepper.htm

Posted by Stephen Pelc on August 21, 2006, 4:52 am

On 19 Aug 2006 11:54:27 -0700, 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. :)

Just as important as torque in some applications, is finding
the upper and lower resonance frequencies. Unless this is
spare-time job, get the documentation for the motor!

Stephen

--
Stephen Pelc, stephenXXX@mpeforth.com
MicroProcessor Engineering Ltd - More Real, Less Time
133 Hill Lane, Southampton SO15 5AF, England
tel: +44 (0)23 8063 1441, fax: +44 (0)23 8033 9691
web: http://www.mpeforth.com - free VFX Forth downloads

Posted by Harry Rosroth on August 24, 2006, 11:46 pm

> Any good way to estimate torque for stepper motors you can't find
> documents for (except for buying a 600 bucks torque meter. :)

There is more than one torque of interest. There is the stall torque,
which most of the replies to your query address, and there is running
torque. The latter depends on the speed, generally the faster the motor
steps, the less the torque, but also on the drive method: direct, R/L, or
chopper drive. The drive method makes a big difference in complexity,
cost, and efficiency as well as torque.

John Piccirillo

Posted by on August 25, 2006, 9:30 am

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. :)

Having played around with turning a drum to mount on a NEMA 23 and
winching a weight up and down with it, realistcally I'd have to say
it's not worth the trouble.

Just bolt the motor onto whatever you want to use it for and see if
it's up to the task. If it can do it slowly but not quickly, look into
the driver circuit. If it can't do it, buy a bigger motor. Chances
you are will be dealing with either NEMA23 of 34 size mounts so you can
change the motor a lot without changing what it bolts onto (off the top
of my head, I'm going to guess you could make a mounting plate with
bolt holes to support either size)

Also consider using toothed timing belts. These let you have variable
gear ratio, absorb vibration, and tolerate the kind of shaft
misalignments you are likely to introduce in anything built without
carefull use of precision machine tools. Of course you can also buy
misalignment couplings...

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