Stepper Motor Question
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Stepper Motor Question JonMarkGo 04-17-2008
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Posted by JonMarkGo on April 17, 2008, 3:18 pm
Will this motor:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name@3-1006-ND
work with this driver chip:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?nameI7-2936-5-ND
?

Posted by Gordon McComb on April 18, 2008, 4:55 pm
JonMarkGo wrote:
>
> Will this motor:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name@3-1006-ND
> work with this driver chip:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?nameI7-2936-5-ND
> ?

Very likely, but be sure the stepper doesn't try to draw more current
than the L293D wants to provide.

A Google search for 'l293d bipolar stepper' turned up up the following
on the first hit. Looks pretty promising:

http://mechatronics.mech.northwestern.edu/design_ref/actuators/stepper_drive1.html

-- Gordon

Posted by Curt Welch on April 19, 2008, 1:03 am
> JonMarkGo wrote:
> > Will this motor:
> > http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name@3-10
> > 06-ND work with this driver chip:
> > http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?nameI7-29
> > 36-5-ND ?
> Very likely, but be sure the stepper doesn't try to draw more current
> than the L293D wants to provide.
> A Google search for 'l293d bipolar stepper' turned up up the following
> on the first hit. Looks pretty promising:
> http://mechatronics.mech.northwestern.edu/design_ref/actuators/stepper_dr
> ive1.html
> -- Gordon

Just curious....

The spec sheet for the stepper says the 35L048B1B-N is 5V bipolar with 11
ohms resistance per winding which I calculate as 454 ma (5/11) (not
counting voltage drop in the driver), and the L293D says good to 600 ma.
Is that all you need to do to calculate the current requirement of a
stepper when the spec sheet doesn't give a current rating? Or are there
other issues to think about?

--
Curt Welch http://CurtWelch.Com/
curt@kcwc.com http://NewsReader.Com/

Posted by Gordon McComb on April 19, 2008, 12:59 pm
Curt Welch wrote:
> Just curious....
>
> The spec sheet for the stepper says the 35L048B1B-N is 5V bipolar with 11
> ohms resistance per winding which I calculate as 454 ma (5/11) (not
> counting voltage drop in the driver), and the L293D says good to 600 ma.
> Is that all you need to do to calculate the current requirement of a
> stepper when the spec sheet doesn't give a current rating? Or are there
> other issues to think about?

I didn't bother looking at the spec sheet, but actually, a lot of people
"over-volt" steppers to get more torque out of them. That increases the
current obviously. But the L293D is stackable (so they say; I've never
done it), to increase current rating. Lots of things to play with.

Steppers are seldom *ideal* motors to use unless you use fancier driving
techniques, like current chopping. Then you get into all kinds of design
parameters for the drivers. So the correct answer to the original
question, other than "42," is "maybe."

-- Gordon

Posted by Wayne C. Gramlich on April 20, 2008, 12:04 am
Curt Welch wrote:
>> JonMarkGo wrote:
>>> Will this motor:
>>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name@3-10
>>> 06-ND work with this driver chip:
>>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?nameI7-29
>>> 36-5-ND ?
>> Very likely, but be sure the stepper doesn't try to draw more current
>> than the L293D wants to provide.
>> A Google search for 'l293d bipolar stepper' turned up up the following
>> on the first hit. Looks pretty promising:
>> http://mechatronics.mech.northwestern.edu/design_ref/actuators/stepper_dr
>> ive1.html
>> -- Gordon
>
> Just curious....
>
> The spec sheet for the stepper says the 35L048B1B-N is 5V bipolar with 11
> ohms resistance per winding which I calculate as 454 ma (5/11) (not
> counting voltage drop in the driver), and the L293D says good to 600 ma.
> Is that all you need to do to calculate the current requirement of a
> stepper when the spec sheet doesn't give a current rating? Or are there
> other issues to think about?

Consider using the SN754410 which is pin compatible with the L293D,
but has almost twice the current capacity.

It might be prudent to measure the actual coil resistance of a few
of the steppers before totally relying on the spec. sheet. Sometimes,
the manufacturer changes the manufacturing process (changes wire gauge)
without updating the spec. sheet.

-Wayne

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