Re: [CAD_CAM_EDM_DRO] linear scales as encoders?
Posted by
Jon Elson
on 2000-07-07 23:31:24 UTC
fogassa@... wrote:
setup.
I don't know about the $99 jobs, though. With that much stuff between
the
motor and the encoder, you would need some serious loop compensation on
the velocity control loop to assure stability.
Now, my servo amps are full analog servos, so they need a DC tach and a
DAC in the computer to send a +- 10 V velocity command to the amp.
I'm working on a way to have cheaper DACs and encoder counters for
EMC than the Servo-to-Go card.
Jon
> Question:I'm getting exited about servo drivers(99 bucks soundsWell, I can tell you that MY servo amps could be made stable with such a
> good)What if one uses a linear scale as a encoder? instead of having
> the encoder right at the motor shaft?I think it would give a better
> positioning of the table itself instead of the error associated with
> lead accuracy,backlash,elastic deformation, or belt drive error.
setup.
I don't know about the $99 jobs, though. With that much stuff between
the
motor and the encoder, you would need some serious loop compensation on
the velocity control loop to assure stability.
Now, my servo amps are full analog servos, so they need a DC tach and a
DAC in the computer to send a +- 10 V velocity command to the amp.
I'm working on a way to have cheaper DACs and encoder counters for
EMC than the Servo-to-Go card.
Jon