Re: re:1. RE: Geckodrive

Milling has two distinct modes of operation; cutting metal and moves
to reposition the cutting tool. The former needs high torque at low
speed, the latter needs low torque at high speeds. A step motor's
inverse speed-torque curve is ideal for that.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Elliot Burke" <elliot@...>
wrote:

>
> Mariss,
> Maybe you could explain why a stepper with encoder operated as a AC

servo is

> preferred to a DC motor with encoder operated as a DC servo?
>
> Once you have added the extra circuitry and hardware, isn't the

complexity

> of the device about the same?
>
> I've heard vehement arguments about both from non-authoritative

sources.

> Sounded a bit like a religous war to me.
>
> regards-
> Elliot
>
> Message: 3
> Date: Sat, 29 Apr 2006 19:44:01 -0000
> From: "Mariss Freimanis" <mariss92705@...>
> Subject: Re: Geckodrive
>
>
>
> 3) A step motor when operated PID closed-loop becomes an AC
> servomotor just as a DC servomotor becomes an ordinary DC motor when
> operated without a PID servo loop.
>
> Mariss
> --
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>