Re: AC Servo's

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "happymarius"
<happymarius@...> wrote:

>
>
>
> HI guys!
>
> I have a knee mill BP (clone)10 X 50 table that I would like to
> convert to CNC.
> The decision has been made : the controler (software ) will be

Mach 3

> ( or Mach 4). I have three AC servos geared (100 to 1), 0.55 Kw,

3000

> RPM, 230 V that I would like to use.
> My question is how I link the software to the AC Servo's? Seen

that

> all the details are for DC STEPPERS not AC SERVO'S I couldn't find
> anything in that respect.
>

In order to use MACH you have to be able to use Step and Direction
signals to control your motors. The short answer is that you will
have to find servo controls specifically for your motors that will
take either Step & Dir TTL level inputs or ones that take +- 10V
control volts and then buy a converter that goes from Step & Dir to
+-10V. The problems with brushless DC /AC Servos is that each motor
type has it's own form of commutation (encoder, Hall Effect, vector,
ect) and the motor control has to match the motor. As a result you
probabaly won't find a lower cost Servo Motor Drive. If you don't
have the matching drivers for these motors it will be an enginnering
challenge to make them work with any Step & Dir solution.

>