Re: Stepper Mid band resonance Help! please...

Very interesting. The principle is similar to what I had devised
except it is far more complicated and less effective. I looked at my
lab books and found the working example of my circuit noterized Feb
22 1983.

Mariss



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "jeffalanp" <xylotex@h...>
wrote:

> Hi Ballendo,
> The following link will give some interesting reading:
>
> First go here:
>
> http://patft.uspto.gov/netahtml/srchnum.htm
>
> then put in this number
>
> 4,540,928
>
> then press search.
>
> Jeff
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
> wrote:
> > Hello,
> >
> > I have been trying to learn how midband resonance is dealt with

by

> > the commercial drivers which claim circuitry solutions. I've not
> > found anything directly related to this on the net. (By direct, I
> > mean somethings which says, "Here's a circuit we use to deal with
> > midrange resonance and here's how it works...")
> >
> > I have heard "clues" like second order damping, and filter... My
> > search has taken me all over the spectrum, looking at snubbers on
> the
> > yokes of CRT's (used to reduce ringing), to Zobel filters.
> >
> > That zobel reference came recently from looking at speaker
> crossover
> > design, which appears to be related as it deals with inserting an
> > arbitrarily variable frequency waveform (akin to our CNC step
> rates)
> > into an inductive load, and the speaker also has midrange

resonance

> > issues, due to ITS construction...
> >
> > I'm self taught and up against the ropes... HELP!
> >
> > Can anyone point me towards some answers or even confirm if I'm
> > anywhere near the right path? How is electronic midrange damping
> > achieved in stepper motor drives?
> >
> > Thank you in advance,
> >
> > Ballendo
> >
> > P.S. Mariss has explained really well WHY it happens, Now I'd

like

> to
> > know how to make it stop. As there are more than a few commercial
> > drives which claim to have solved it, I assume that on some
> (rarified
> > from my perspective<G>) level it is common knowledge?!?!?