Quote Originally Posted by m_c View Post
I'm about to head out, so this is a very brief explanation.
Generally smaller motors the torque doesn't drop off as quick, especially on relatively lower voltage power supplies. Larger motors can maintain a similar torque drop, however you're into high voltage drivers, which carry an additional cost. So you can quite often get better performance from a smaller motor spun faster from a lower voltage, than you can with a large motor run from a less than ideal voltage.

And that is probably as clear as mud, but I've got to go!
Thanks again - I think I get it. I thought I was good on electrics and motors until I started reading up on steppers!