re:Re: L297/298's

Jon E gives you some good advice.
I would definitely increase the power supply voltage.
It doesn't hurt to have some extra amps waiting in the wings, either.

Also, Are you connected "full-coil" or "half- coil"? (assuming you
have 6 or 8 wire motors) Although it goes against the "common sense",
you will almost always get better performance(speed) from 1/2 coil
connection. Mariss has explained the REASONS in previous posts.

Ballendo

>were you just turning on the pulse train at the test frequency, or
>were you ramping the pulse rate up and down? You will get much
>better results if you gradually raise the pulse rate, to allow the
>motor to accelerate.

>You may also need to give much higher voltage to the stepper driver.
>Actually, due to transistor voltage drop and the winding resistance,
>the drop in current willactually ocurr at lower speeds.
>Jon