Re: Re : motor woes

> I'm tried them from 12-30V with current limiting, R/L but from what
> you and Tim have said it looks like they are never gonna run fast.
>
> I'm going to return them and if I go for unipolar probably get

StepSyn

> 103H7123-0410.
>
> Specs for these are 3.2V, 2A, 1.6Ohm, 3.8mH per phase.
>
> I've now found a schematic for a simple chopper driver using
> L297/L298's , I now may go with Bipolar type motors, if I can

remember

> how to use Protel to produce the PCB :)
>
>
> Steve Blackmore
> --
> Pilot Consultancy Limited ***** Computer Consultants
> Telephone 01744 752256 Mobile 07831 768478
> Email: steve@p... WWW: http://www.pilotltd.net

Hi Steve,
Heres the link that Tim refered to, I posted it earlier...
http://home.earthlink.net/~rustle/stepper/Tutorials/CurTutor.htm

And a couple more...
http://www.cs.uiowa.edu/~jones/step/
http://www.geckodrive.com/support/pdf/

Its best to run steppers from 5 to 25 times their rated voltage. And
Bipolar is prefered over Unipolar. Also a Bipolar Drive will run 6
wire Unipolar steppers with the windings in series, but then your
inductance increases doing that, or by only using 2 of the 4 windings.

L297/L298's is a good setup but their rated for 2Amps but I don't
particularly like running electronics at their max rating as you
would need to with the 103H7123-0410's. Some people use 1 L297
driving 2 L298's in parallel and derate them at 3 Amps. I think some
of the people in this group make and sell Drives based on these ICs.
Buying might save you some headaches over building. Not to mention
the time saved.

Another option you might want to consider is the Gecko Drive...
http://www.geckodrive.com/

Is is a microstepper Drive and many on this group use them. Also Tim
has some of the original 201's left at a discounted price, I just
bought 3 from him for my project. (Tim, I'm the one with the great
postal service ;) ) Their rated up to 80vdc and 7 amps, this ought
give you plenty of options motor and power supply wise.
http://www.timgoldstein.com/CNC/g201special.asp

mike