Re: [CAD_CAM_EDM_DRO] Better servo performance: Ameteks at 60V, 80V ?

Kim Lux wrote:

>High people.
>
>We've got Ametek servo motors on some of our CNC equipment. Everything
>work well, but we are limited to 150 IPM. We'd like our rapid speeds to
>be faster, something closer to 400 IPM.
>
>Does anyone know of servo motors with about 600 OZ In torque (peak),
>reasonable size and a top speed of about 2000 RPM, with a reasonable
>price tag ?
>
>There is nothing wrong with the Ameteks except that they are only rated
>for 900 RPM with a 40 Volt supply. I'm wondering how they would run
>with a 60 or 80V supply. Right now they run cool all the time, whether
>running fast or slow, even under heavy cuts. We have plenty of cutting
>power.
>
>

Generally, the voltage rating of these motors is the softest of limits.
The one
place it may be critical is if the motor vendor assumed unlimited current
from the diver, and is using the motor's resistance to prevent magnet
damage.
In that case, you need to know (or infer) the motor's peak current
limit, and
set the servo driver to not exceed this. I believe this is the case for
these Ametek
motors. They have about 4 Ohms resistance, and the 40 V spec. If you set
the driver for a 10 Amp limit, you should be safe to turn the supply voltage
up. If the motors are running cool now, I don't think you'll have any
problem.

Jon