Re: [CAD_CAM_EDM_DRO] Re: steppers or servo?

Mariss Freimanis wrote:

> Dan and Bob. I looked up the info and it appears to be a three-phase
> brushless DC motor with an integral encoder and drive electronics.

Cute idea. It probably builds on the use of these motors in disk drives

and all sorts of other applications. But, when moving very slowly, I'll

just bet there's a torque transient when the motor switches windings.
They would have to work VERY hard on the winding pattern to avoid
a significant transient, since this is likely a 2-pole motor winding,
like
the disk drive motors, and so it only gets commutated 6 times (or is it
12?) per revolution.

Jon