Re: Yaskawa servo nice motor?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

>
>
> bitnick78 wrote:
>
> >Hi group!
> >
> >Would this be a good motor for a bridge type milling machine

intended

> >for wood and light aluminium work? To be coupled to a lead screw

with

> >lead of 5 mm/turn.
> >
> >* 3-ph 200 watt PM
> >* cont/peak torque: 0.64/1.91 Nm
> >* winding resistance: 3 Ohm
> >* cont/peak current: 2.0/6.0 A
> >* torque constant: 0.355 Nm/A
> >* rated voltage: 200 V (don't know why this is specified, isn't
> >current the important thing?)
> >* voltage constant: about 80 V peak-to-peak / 1000 RPM (I measured
> >this by spinning the motor at about 1000 RPM and watching the

voltage

> >on an oscilloscope)
> >* encoder: 2000 counts/rev
> >
> >
> Certainly a nice motor, although 200 W peak is a bit weak. 200 W
> continuous should be better. But, do you have a suitable driver or
> servo amp for this motor? Don't price it from Yaskawa, you'll have
> a heart attack! 3 of them would run close to ten grand!
>
> Jon

The motor is rated for 3000 RPM with full torque. 3000 RPM = ~314
rad/s. 314 rad/s * 0.64 Nm = ~200 W, so I guess this is the continous
output power.

I think I can get servo packs for a good price, the problem is I also
need a special programming device (Yaskawa calls it a "Digital
Operator") to be able to set up the servo amp. In the manual for the
Servo pack/motor, it is mentioned that programming could also be done
with a computer, but I cannot find anything about how this is done.
I do however have the pinout of the connector, and if I had a
specification on the protocol used I'm sure I could build a level
translator between RS-232 and the Servo Pack. Programming could then
be done via a terminal window.

Do anyone have this specification, or know where I can find it?

Arvid