Re: [CAD_CAM_EDM_DRO] Denford Triac mill with Fanuc OM Mate control

Graham Sutton wrote:

>Jon
>
>Thanks for the reply, I will try to get servo drive
>model numbers. I guess from what your saying is that
>+/- 10v is some kind of a standard. I have not heard
>of A/C servos being used on mill drives before. I
>only have experiance of Bridgeport Interact. Other
>than not having to put in big D/C supplies I can't see
>why the manufacturer has gone down this A/C route
>maybe you could throw some light on this for me.
>
>

It has nothing to do with DC suppies, as some AC drives
use a separate DC supply, some have it integrated.

The 2 big differences are :

1. no brushes in motor to wear out

2. all coil wires in motor are stationary in motor housing, allowing
heat to be removed better. The only thing that turns are the
magnets.

All new machines are being built with AC drives of one sort or another.
(There are permanent magnet and induction AC servos.)

Yes, +/- 10 V was the old analog servo standard, used for about 30
years. You can still buy most servo drives with this input as an
option.

Jon