Hi Dwayne,

I cannot attach the data sheet as the piclist will not let through a 2MB fi=
le,
but that is a step motor NEMA 53 with 7000 oz-in (50N-m).

Company is JVL out of Denmark (I think).

http://www.jvl.dk/files/_2011clean/pdf/ld0112.pdf

Regards,
Jean-Paul
N1JPL / ex AC9GH






> On Dec 16, 2015, at 6:09 PM, Dwayne Reid <dwayner@planet.eon.net> wrote:
>=20
> Good day to all.
>=20
> I'm helping one of my coworkers with a project that he is dealing=20
> with.  We are providing motors and controls for a sand-blasting=20
> machine that cleans the inside of pipe.
>=20
> We've been struggling with this for several months now.  We started=20
> with the original machine design as supplied by the engineering firm=20
> and picked a couple of medium-sized Nema 34 motors and paired them=20
> with Geckodrive stepper drive modules.  These work well in our shop.
>=20
> Unfortunately, it turns out that the company actually building the=20
> machine thought that the design as supplied by the other engineering=20
> firm was too "wussy" and they made changes.  Big changes.  The net=20
> result is that they need motors MUCH larger than originally specified.
>=20
> We brought in the largest Nema 34 motor that we could find - from=20
> Anaheim Automation - this is a 1200 Oz-Inch motor.  Way too small.
>=20
> I went searching on eBay and found a stepper motor / driver=20
> combination from Longs Motor (China).  The motor is a size Nema 42=20
> and is rated at 4120 Oz-Inches.  Customer says that it's barely large=20
> enough and they want something with a little more muscle.  The idea=20
> is to have a motor and drive combination that is larger than=20
> required, then turn the current limit down as needed to reduce the=20
> motor torque to a suitable value.
>=20
> I had considered using a servo motor and drive - I have a couple of=20
> large servo motors here that have WAY more torque than is=20
> required.  The problem is safety - if an encoder or its wiring fails,=20
> the servo runs open-loop.  This is not acceptable.
>=20
> So: I'm looking for a stepper motor larger than 4120 Oz-Inches.  I=20
> don't know where to look and I'm hoping that someone can suggest=20
> where to go looking.
>=20
> Many thanks!
>=20
> dwayne
>=20
> --=20
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
> www.trinity-electronics.com
> Custom Electronics Design and Manufacturing
>=20
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.