RE: [CAD_CAM_EDM_DRO] Relinear encoder source: Now Limbo Rock

Peter:

I've worked with some of the CompuMotor servo systems. The equivalent of
"missing steps" with a servo motor is having the difference between actual
shaft angle and the "computed" shaft angle be larger than some allowable
error. When this occurred, the motor was shut down and allowed to "free
wheel" until the controller was reset. One line from the controller back to
the computer was set to logic zero to alert the computer of the problem.
Your software had to detect this line and take appropriate action. With
CompuMotor controllers, this was a "wired-or" connection so several motor
controller failures could be checked by monitoring one line.

-- Carol & Jerry Jankura
Strongsville, Ohio
So many toys, so little time



-----Original Message-----
From: cadcamcenter@... [mailto:cadcamcenter@...]
Sent: Monday, May 21, 2001 7:47 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Relinear encoder source: Now Limbo Rock


LIMBO ROCK

Doug, Chris, Jerry

A stepper motor misses a step or more when the torque is inadequate.
What happens when this happens with a servo motor? It stalls? With an
airplane/car engine,we will know for sure when it happens, but with
the servo motor how is stalling detected?