Re: Thanks - Servo Motor Make Up -w- Follow Up Question

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Delaney"
<jdelaney2@s...> wrote:

>
> So assuming the servo system is set up and working correctly. If I
> were to tell software to keep the motor at some position 'A' and I
> placed a constant load on the motor to try to move from 'A' the
> result would be a series of pulses coming from the drive to the

motor

> of sufficient amplitude to keep the motor at position 'A'. Yes? I
> imagine it would bounce within the limits of the encoder too?

An encoder has a discrete output. There are no limits, only off and
on. One pulse is small enough that stick slip on most machines will
not permit any motion for a single encoder pulse. The control loop
will determine how close to stationary the shaft will remain, given
steady state load conditions.

> Then the motor is eventually going to get pretty hot if the load is
> great enough?

Many servos are rated for 105 degrees C. If you power them with a
constant load at the rated value, they will reach 105 degree C,
eventually. less load = less heat, unlike a stepper where no motion
= heat. A servo at rest with no load is cool. If you power the
servo lightly or intermittently, it will run cool.

Fred Smith - IMService

Desktop servo systems
http://www.imsrv.com/deskcnc/bench_top_cnc_systems.htm