Re: [CAD_CAM_EDM_DRO] Re:Stepper Motor vs Servo Motor

> They have full torque at 0 speed but tend to drop as speed increases.
> Modern drivers have made these motors perform quite well. They are
> easy to drive and maintain and are open loop capable. All the
> positioning is done by the motor design you just tell it how many
> steps to take by driving the coil sequence.

An excellent post! I haven't taken the time to read through and fully
understand how steppers function in all the different modes yet but I have a
rough idea. I don't know how the actually stepper itself moves though. You
say they have less torque at full speed, I know that, but why do they have
any at all? Isn't there ever a point where there is no power to any of the
coils, or does the control fade between them? Do the coils active and pull
the magnets towards them or push them away?

I bet I sound like I chew my ankles now. : )
John