I didn't know the L297/L298 combination makes a chopper driver. I haven't looked much at steppers. Thanks for the info!
I just took a quick look in the L298's data sheet. Looks like it can take voltages up to 46V. Perhaps a good start would be to switch to a 36V power supply? Then if you are still not happy with the speed, upgrade the motors to lower voltage/higher current ones.
Arvid |