Re: [CAD_CAM_EDM_DRO] stall detection without encoder?

Hi Peter,

Interesting idea. I don't think it's new. I believe Mariss and I have
discussed monitoring V/A's of the stepper motors, for this or similar
purposes. The Software would have to read A/D's, and look for the
signature of a stall in the data. I believe Mariss' hardware might
sense? Not sure. If we knew what to look for... "missed" step
detection would be valuable!

Alan KM6VV


cadcamcenter@... wrote:

>
> Hi programming Einsteins,
>
> don't know if this is old hat. Chanced upon this site:
>
> http://www.controleng.com/archives/2000/ctl0601.00/000600.htm
>
> Extracted from the above site:
>
> <Stall detection without a formal feedback device is a target for
> holding down costs at several manufacturers. Parker Hannifin,
> Compumotor Div. (Rohnert Park, Calif.) claims its Gemini GT is the
> first stepper drive with an encoderless technique to sense a stalled
> motor—as well as the industry's only fully digital stepper drive.>
> <A software algorithm acts as the "sensor." It monitors voltage and
> current signals passing between the step motor and drive. By
> analyzing the signals, and comparing their amplitudes and frequencies
> with known values for normal step motor behavior, a stall condition
> can be recognized. The stall threshold sensitivity is user
> adjustable. >
>
> Is this a fertile area for the hobby programming aficionados on the
> list to try their programming skills?
>
> Peter