Re: [CAD_CAM_EDM_DRO] Re: breakout boards plus - hard choice

Mark Vaughan wrote:

> It may be possible to do this with a Grex, but that would require encoder
> feedback to the Grex, which is not part of the unstallable stepper
> philosophy.
>

I believe it HAS to have encoders to detect the phase angle
between the coil currents and the mechanical position. I am
very sure Mariss described having an encoder on the motor whiole
doing his experiments. Although it may be possible to detect
this phase angle from the voltage/.current pattern of the
motor's coils, I think it would be extremely difficult to do it
over a wide range of speeds, and practically impossible to do at
zero speed.

> The unstallable stepper just relies that if there is too much load

How can the drive know what the load is, except by the motor
being pushed away from the commanded position?

Jon