CAD CAM EDM DRO - Yahoo Group Archive

Stepper Motor Torque vs. Wiring

Posted by Chris and Dee
on 2002-11-08 08:19:58 UTC
Hi all,

I was hoping somebody could enlighten me. Just when I think I'm
starting to understand something, I read something that confuses me
again....

The following link shows a chart of the torques, etc of some Superior
Electric Stepper Motors.

http://www.slosyn.com/ssstepmotors_stndrdnema34.html

I have some M092-FD09 motors that I'm in the process of connecting.
Last night I hooked them up in 'Full Winding' mode according to
Mariss' explanation in the Geckodrive papaers. My understanding was
that the full winding mode corresponds to what Superior Electric is
referring to as 'Bipolar' in the above webpage and that the half
winding configuration is what is referred to as unipolar. (My primary
indication of this is that the inductance on the bipoar section of
the table is 4X that in the unipolar section which corresponds to the
statement made in the gecko papers if I'm not mistaken).

However, two questions come up.

1st, The Geockodrive instructions indidcate that the current should
be limited to half of the unipolar nameplate rating on the motor but
the Slo-Syn says that the current for bipolar is not quite 1/2 the
amount. Is 1/2 the current a conservative theoretical number and the
slo-syn chart is likely giving a more accurate empirical value for
those windings?

2nd (and most confusing), the geockodrive instructions indicate that
a motor connected in parallel (or half winding, since a series
connection is associated with a full winding connection) will have
twice the power of a motor connected in series (or full winding).
This directly conflicts with the information on the above website if
bipolar refers to full winding and unipolar refers to half winding.

Please help! :-)

Thanks,
-Chris

Discussion Thread

Chris and Dee 2002-11-08 08:19:58 UTC Stepper Motor Torque vs. Wiring mariss92705 2002-11-08 09:22:09 UTC Re: Stepper Motor Torque vs. Wiring Tim Goldstein 2002-11-08 09:42:06 UTC Re: [CAD_CAM_EDM_DRO] Stepper Motor Torque vs. Wiring Chris and Dee 2002-11-08 10:29:30 UTC Re: Stepper Motor Torque vs. Wiring