Re: [CAD_CAM_EDM_DRO] Higher voltage servo motors with low volt drivers

Mina Aboul Saad wrote:

>I posted a thread a couple of days ago, indicating my need to change an old
>controller on a medium size bed lathe with a setup of Turbocnc and Gecko
>320.
>Motors are as follows:
>Servo motors are Siemens with the following specs:
>- Dc Servo, permanent magnet.
>- 1.03 kW
>- 2000 RPM
>- 176 V
>- 7.1 A
>- Max. torque 5 Nm
>With an optical encoder, +5v and 1024 count/turn.
>
>I received a couple of replies one indicating that I would loose a lot of
>speed as Gecko's max voltage is 80V, and the other is that I should try a
>copley driver.
>I took a look and Copley drivers, I got a little lost as my Electrical
>background is not so good, but I think they do not accept Step&Direction
>from a PC.
>

Right.

>My question is, if I'm willing to sacrifice the speed, will the Geckos run
>my motors, what about the torque??? will I loose a lot of torque???
>And regarding the current will it be suitable to run 7.1 A with Geckos???
>
>

You will not lose any torque, as the motors are rated at 7.1 A. (Even
if that
is the continuous rating, the Gecko can deliver 20 A.)

But, you should look a Rutex, as they have a higher voltage rated step/dir
driver.

Jon