Re: [CAD_CAM_EDM_DRO] Re: Gecko 320 VS. 340

Mariss

Reread the subject line, I think he was asking the difference
between the 320 and 340 not the 420

Bill

Subject: [CAD_CAM_EDM_DRO] Re: Gecko 320 VS. 340

> Hi,
>
> The G420 is a 3-phase brushless DC servodrive. In all other specs it
> is the same as a G320.
>
> I have got a few dozen hours of running time in on the prototype.
> Right now it functions just like the G320 except there is a noticable
> discontinuity or "tick" on every Hall sensor edge (every 60 degrees).
> This is something I would like to attenuate or eliminate altogether.
>
> One promising idea that has ocurred to me is to phase lock a ramp
> function off of the hall sensor edges. This ramp then would be used
> as an attenuation function for the "off" winding. Rather than
> abruptly switching a winding "off" or "on", the current would be
> gradually applied or removed, eliminating the discontinuity. The
> behavior should then approach what one would expect from a
> sinusoidally commutated motor.
>
> I have a breadboard started.
>
> Mariss
>