Re: [CAD_CAM_EDM_DRO] Servo motor torque curves and duty cycle info

Hi Kim;

I'm just a technician but I can say that much of what I've seen with
repect to motor sizing does not make alot of sense to me. First I was
under the impression that gear reductions are used for two things, one
to match inertias and two to change the resolution of a system. An
improperly sized servo motor will over heat irregardless of the mounting
method or gear reduction. Given a motor with a specific set of
operating parameters, gear reduction may be required to achieve
operation within those parameters, but do realize that that will cause
issues else where.

As far as direct drives that is nice, but I've seen more servo systems
with 1:1 belt drives than I can count. I've also seen direct drive
servo systems last for year on the plant floor without issue, again if
the motor is sized to the load and operates within its design parameters
you will be ok. By the way a number of things beyond proper sizing of
a motor can cause heating issue, not the least of which are tuning of
the servo drive and the loop driving the drive. Often maximum
performance is achived with the use of an oscilloscope. At least
thats how we did it back when I was working on diamond turning lathes.

Steppers have their good qualities not the least of which is simplicity,
but these devices are quickly eclipsed by real servo motors. Stepper
are just that, it isn't even accurate to call them motors.

Thanks
dave



Kim Lux wrote:

>People might find these interesting.
>
>http://www.torquesystems.com/files/brushseries_2600.pdf
>
>http://www.torquesystems.com/files/brushseries_3500.pdf
>
>http://www.torquesystems.com/files/brushseries_4100.pdf
>
>http://www.torquesystems.com/files/brushseries_5300.pdf
>
>Also check out: http://www.mcg-net.com/index.php
>
>
>