Re: 3 axis allegro 3977 stepper motor board

Hello,

The limits for the A3977 are 35VDC, and 2-1/2A per phase. Several
dual stack 34 size steppers FAR in excess of 200 oz. in. will
fit "into" these specs...

Hope this helps,

Ballendo

P.S. Speed may not be optomised, but with rack/pinion, cable, chain,
or timing belt, this does not factor largely in an acceptable
outcome.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Homann"
<peter.homann@a...> wrote:

> The 3977 chip is probably limited to motors up to around the 200

oz/in

> range.
>
>
> Peter Homann
> mailto:Peter.Homann@a...
> Adacel Technologies Limited,
> 250 Bay St, BRIGHTON, 3186, AUSTRALIA
> http://www.adacel.com <http://www.adacel.com>
> Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
> Mobile 0421-601 665
>
>
> > -----Original Message-----
> > From: Raymond Heckert [mailto:jnr@a...]
> > Sent: Friday, 12 December 2003 2:20 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] 3 axis allegro 3977 stepper motor

board

> >
> >
> > I'm interested! I need to design a one-axis stepper powered
> > actuator. I'm
> > planning on using about 300 to 500 oz-in stepper motors. Any help

will be

> > greatly appreciated.
> >
> > RayHex
> >
> > ----------
> > > From: stokessd <stokes@s...>
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] 3 axis allegro 3977 stepper motor

board

> > > Date: Thursday, December 11, 2003 6:55 PM
> > >
> > > I've designed a simple 3 axis stepper motor driver board based
> > around the
> > allegro
> > > 3977 microstepping controller chip. I'll be glad to share my

design

> > (although it's very
> > > simple) with anyone interested.
> > >
> > > the 3977 is an interesting chip and the microstepping can
> > improve motion,
> > but my
> > > experience with PWM motor controllers hasn't been great (I've

used the

> > newport
> > > motion master 4000 for years in the lab). So I'm seriously

considering

> > designing a
> > > half-stepping controller with current sources instead of ballast
> > resistors (and FET pass
> > > transistors).
> > >
> > > However this board has worked well for me on the bench, even

though it

> > sprays noise
> > > all over the place. Here's a few pictures of it :
> >
> >
> > Addresses:
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