Re: 3 axis allegro 3977 stepper motor board

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...> wrote:

> 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.

the allegro chip is nice, but it's limited to 2.5 amps and a max voltage (including back
EMF) of 35 volts. The 35 volts is pretty easy to stay within, but with such a high
torque stepper, you may have a need for more than 2.5 amps per coil. If you do, and
really really want microstepping, Gecko's are probably the way to go. If you can toss
microstepping (not a huge loss IMHO), there are a lot of good cheap designs out there
that can dump huge amounts of current.


Sheldon