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

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> From: stokessd <stokes@...>
> 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 :