Re: G201A - round of applause for Mariss..

Doug,

Good evening! The servoamp would be just that; an amplifier. It will
be jumperable for torque mode, velocity mode and IR compensated mode.
The loop would be closed at the computer or motion controller. It
would still have current limit adjust as well as balance and gain
trimpots. The interface will be +/- 10VDC as well as 0 to +5VDC; take
your pick.

The brushless servodrive will be eqivalent to the above as well as
a "G320" version. Like everyone else, I bought several of the 40W
brushless servomotors with encoders that were being peddled around a
while ago. They make an excellent test bed because the encoder has
three 120 degree commutator channels as well as a quadrature encoder
with index.

Breadboarding now and revising. When that's done, the layout begins.
Basically 6 months out at this.

Mariss

Mariss

--- In CAD_CAM_EDM_DRO@y..., Doug Fortune <pentam@h...> wrote:
> mariss92705@y... wrote:
>
> > I've made some improvements to the G201
> > that were were requested. The improvements are:
> >
> > 1) Automatic current standby of 33% of set current after 1 second
after
> > last issued step pulse,(disableable internally).
> >
> > 3) The opto-isolator now operates at 8mA instead of 16mA. The
greater
> > sensitivity better matches the drive capability of a LPT port.
>
> These are BIG wins!
>
> > All these improvements are at no increase in price.
>
> That never hurts either....
>
> > Minor stuff includes a common servoamp design (+/- 10 vot input
> > transconductance amplifier) and a 3-phase brushless DC
servoamplifier.
>
> Whooa, this is not minor .. a bunch of us have been waiting for
this!
> Does this use the quadrature encoder for feedback, and if so, how do
> you compensate for differing counts/rev from different models. Does
> it need the index pulse?
>
> > Mariss
> > Geckodrive Inc.
>
> Good work!
>
> Doug Fortune